diff options
Diffstat (limited to 'drivers/gpu/drm/xlnx/zynqmp_dp.c')
| -rw-r--r-- | drivers/gpu/drm/xlnx/zynqmp_dp.c | 1917 |
1 files changed, 1917 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c new file mode 100644 index 000000000000..c3c86dacac97 --- /dev/null +++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c @@ -0,0 +1,1917 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ZynqMP DisplayPort Driver + * + * Copyright (C) 2017 - 2018 Xilinx, Inc. + * + * Author: Hyun Woo Kwon <hyun.kwon@xilinx.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <drm/drmP.h> +#include <drm/drm_atomic_helper.h> +#include <drm/drm_probe_helper.h> +#include <drm/drm_connector.h> +#include <drm/drm_crtc.h> +#include <drm/drm_crtc_helper.h> +#include <drm/drm_dp_helper.h> +#include <drm/drm_of.h> + +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/phy/phy.h> +#include <linux/phy/phy-zynqmp.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/uaccess.h> + +#include "zynqmp_disp.h" +#include "zynqmp_dpsub.h" + +static uint zynqmp_dp_aux_timeout_ms = 50; +module_param_named(aux_timeout_ms, zynqmp_dp_aux_timeout_ms, uint, 0444); +MODULE_PARM_DESC(aux_timeout_ms, "DP aux timeout value in msec (default: 50)"); + +/* + * Some sink requires a delay after power on request + */ +static uint zynqmp_dp_power_on_delay_ms = 4; +module_param_named(power_on_delay_ms, zynqmp_dp_power_on_delay_ms, uint, 0444); +MODULE_PARM_DESC(aux_timeout_ms, "DP power on delay in msec (default: 4)"); + +/* Link configuration registers */ +#define ZYNQMP_DP_TX_LINK_BW_SET 0x0 +#define ZYNQMP_DP_TX_LANE_CNT_SET 0x4 +#define ZYNQMP_DP_TX_ENHANCED_FRAME_EN 0x8 +#define ZYNQMP_DP_TX_TRAINING_PATTERN_SET 0xc +#define ZYNQMP_DP_TX_SCRAMBLING_DISABLE 0x14 +#define ZYNQMP_DP_TX_DOWNSPREAD_CTL 0x18 +#define ZYNQMP_DP_TX_SW_RESET 0x1c +#define ZYNQMP_DP_TX_SW_RESET_STREAM1 BIT(0) +#define ZYNQMP_DP_TX_SW_RESET_STREAM2 BIT(1) +#define ZYNQMP_DP_TX_SW_RESET_STREAM3 BIT(2) +#define ZYNQMP_DP_TX_SW_RESET_STREAM4 BIT(3) +#define ZYNQMP_DP_TX_SW_RESET_AUX BIT(7) +#define ZYNQMP_DP_TX_SW_RESET_ALL (ZYNQMP_DP_TX_SW_RESET_STREAM1 | \ + ZYNQMP_DP_TX_SW_RESET_STREAM2 | \ + ZYNQMP_DP_TX_SW_RESET_STREAM3 | \ + ZYNQMP_DP_TX_SW_RESET_STREAM4 | \ + ZYNQMP_DP_TX_SW_RESET_AUX) + +/* Core enable registers */ +#define ZYNQMP_DP_TX_ENABLE 0x80 +#define ZYNQMP_DP_TX_ENABLE_MAIN_STREAM 0x84 +#define ZYNQMP_DP_TX_FORCE_SCRAMBLER_RESET 0xc0 +#define ZYNQMP_DP_TX_VERSION 0xf8 +#define ZYNQMP_DP_TX_VERSION_MAJOR_MASK GENMASK(31, 24) +#define ZYNQMP_DP_TX_VERSION_MAJOR_SHIFT 24 +#define ZYNQMP_DP_TX_VERSION_MINOR_MASK GENMASK(23, 16) +#define ZYNQMP_DP_TX_VERSION_MINOR_SHIFT 16 +#define ZYNQMP_DP_TX_VERSION_REVISION_MASK GENMASK(15, 12) +#define ZYNQMP_DP_TX_VERSION_REVISION_SHIFT 12 +#define ZYNQMP_DP_TX_VERSION_PATCH_MASK GENMASK(11, 8) +#define ZYNQMP_DP_TX_VERSION_PATCH_SHIFT 8 +#define ZYNQMP_DP_TX_VERSION_INTERNAL_MASK GENMASK(7, 0) +#define ZYNQMP_DP_TX_VERSION_INTERNAL_SHIFT 0 + +/* Core ID registers */ +#define ZYNQMP_DP_TX_CORE_ID 0xfc +#define ZYNQMP_DP_TX_CORE_ID_MAJOR_MASK GENMASK(31, 24) +#define ZYNQMP_DP_TX_CORE_ID_MAJOR_SHIFT 24 +#define ZYNQMP_DP_TX_CORE_ID_MINOR_MASK GENMASK(23, 16) +#define ZYNQMP_DP_TX_CORE_ID_MINOR_SHIFT 16 +#define ZYNQMP_DP_TX_CORE_ID_REVISION_MASK GENMASK(15, 8) +#define ZYNQMP_DP_TX_CORE_ID_REVISION_SHIFT 8 +#define ZYNQMP_DP_TX_CORE_ID_DIRECTION GENMASK(1) + +/* AUX channel interface registers */ +#define ZYNQMP_DP_TX_AUX_COMMAND 0x100 +#define ZYNQMP_DP_TX_AUX_COMMAND_CMD_SHIFT 8 +#define ZYNQMP_DP_TX_AUX_COMMAND_ADDRESS_ONLY BIT(12) +#define ZYNQMP_DP_TX_AUX_COMMAND_BYTES_SHIFT 0 +#define ZYNQMP_DP_TX_AUX_WRITE_FIFO 0x104 +#define ZYNQMP_DP_TX_AUX_ADDRESS 0x108 +#define ZYNQMP_DP_TX_CLK_DIVIDER 0x10c +#define ZYNQMP_DP_TX_CLK_DIVIDER_MHZ 1000000 +#define ZYNQMP_DP_TX_CLK_DIVIDER_AUX_FILTER_SHIFT 8 +#define ZYNQMP_DP_TX_INTR_SIGNAL_STATE 0x130 +#define ZYNQMP_DP_TX_INTR_SIGNAL_STATE_HPD BIT(0) +#define ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REQUEST BIT(1) +#define ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REPLY BIT(2) +#define ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REPLY_TIMEOUT BIT(3) +#define ZYNQMP_DP_TX_AUX_REPLY_DATA 0x134 +#define ZYNQMP_DP_TX_AUX_REPLY_CODE 0x138 +#define ZYNQMP_DP_TX_AUX_REPLY_CODE_AUX_ACK (0) +#define ZYNQMP_DP_TX_AUX_REPLY_CODE_AUX_NACK BIT(0) +#define ZYNQMP_DP_TX_AUX_REPLY_CODE_AUX_DEFER BIT(1) +#define ZYNQMP_DP_TX_AUX_REPLY_CODE_I2C_ACK (0) +#define ZYNQMP_DP_TX_AUX_REPLY_CODE_I2C_NACK BIT(2) +#define ZYNQMP_DP_TX_AUX_REPLY_CODE_I2C_DEFER BIT(3) +#define ZYNQMP_DP_TX_AUX_REPLY_CNT 0x13c +#define ZYNQMP_DP_TX_AUX_REPLY_CNT_MASK 0xff +#define ZYNQMP_DP_TX_INTR_STATUS 0x140 +#define ZYNQMP_DP_TX_INTR_MASK 0x144 +#define ZYNQMP_DP_TX_INTR_HPD_IRQ BIT(0) +#define ZYNQMP_DP_TX_INTR_HPD_EVENT BIT(1) +#define ZYNQMP_DP_TX_INTR_REPLY_RECV BIT(2) +#define ZYNQMP_DP_TX_INTR_REPLY_TIMEOUT BIT(3) +#define ZYNQMP_DP_TX_INTR_HPD_PULSE BIT(4) +#define ZYNQMP_DP_TX_INTR_EXT_PKT_TXD BIT(5) +#define ZYNQMP_DP_TX_INTR_LIV_ABUF_UNDRFLW BIT(12) +#define ZYNQMP_DP_TX_INTR_VBLANK_START BIT(13) +#define ZYNQMP_DP_TX_INTR_PIXEL0_MATCH BIT(14) +#define ZYNQMP_DP_TX_INTR_PIXEL1_MATCH BIT(15) +#define ZYNQMP_DP_TX_INTR_CHBUF_UNDERFLW_MASK 0x3f0000 +#define ZYNQMP_DP_TX_INTR_CHBUF_OVERFLW_MASK 0xfc00000 +#define ZYNQMP_DP_TX_INTR_CUST_TS_2 BIT(28) +#define ZYNQMP_DP_TX_INTR_CUST_TS BIT(29) +#define ZYNQMP_DP_TX_INTR_EXT_VSYNC_TS BIT(30) +#define ZYNQMP_DP_TX_INTR_VSYNC_TS BIT(31) +#define ZYNQMP_DP_TX_INTR_ALL (ZYNQMP_DP_TX_INTR_HPD_IRQ | \ + ZYNQMP_DP_TX_INTR_HPD_EVENT | \ + ZYNQMP_DP_TX_INTR_REPLY_RECV | \ + ZYNQMP_DP_TX_INTR_REPLY_TIMEOUT | \ + ZYNQMP_DP_TX_INTR_HPD_PULSE | \ + ZYNQMP_DP_TX_INTR_EXT_PKT_TXD | \ + ZYNQMP_DP_TX_INTR_LIV_ABUF_UNDRFLW | \ + ZYNQMP_DP_TX_INTR_CHBUF_UNDERFLW_MASK | \ + ZYNQMP_DP_TX_INTR_CHBUF_OVERFLW_MASK) +#define ZYNQMP_DP_TX_NO_INTR_ALL (ZYNQMP_DP_TX_INTR_PIXEL0_MATCH | \ + ZYNQMP_DP_TX_INTR_PIXEL1_MATCH | \ + ZYNQMP_DP_TX_INTR_CUST_TS_2 | \ + ZYNQMP_DP_TX_INTR_CUST_TS | \ + ZYNQMP_DP_TX_INTR_EXT_VSYNC_TS | \ + ZYNQMP_DP_TX_INTR_VSYNC_TS) +#define ZYNQMP_DP_TX_REPLY_DATA_CNT 0x148 +#define ZYNQMP_DP_SUB_TX_INTR_STATUS 0x3a0 +#define ZYNQMP_DP_SUB_TX_INTR_MASK 0x3a4 +#define ZYNQMP_DP_SUB_TX_INTR_EN 0x3a8 +#define ZYNQMP_DP_SUB_TX_INTR_DS 0x3ac + +/* Main stream attribute registers */ +#define ZYNQMP_DP_TX_MAIN_STREAM_HTOTAL 0x180 +#define ZYNQMP_DP_TX_MAIN_STREAM_VTOTAL 0x184 +#define ZYNQMP_DP_TX_MAIN_STREAM_POLARITY 0x188 +#define ZYNQMP_DP_TX_MAIN_STREAM_POLARITY_HSYNC_SHIFT 0 +#define ZYNQMP_DP_TX_MAIN_STREAM_POLARITY_VSYNC_SHIFT 1 +#define ZYNQMP_DP_TX_MAIN_STREAM_HSWIDTH 0x18c +#define ZYNQMP_DP_TX_MAIN_STREAM_VSWIDTH 0x190 +#define ZYNQMP_DP_TX_MAIN_STREAM_HRES 0x194 +#define ZYNQMP_DP_TX_MAIN_STREAM_VRES 0x198 +#define ZYNQMP_DP_TX_MAIN_STREAM_HSTART 0x19c +#define ZYNQMP_DP_TX_MAIN_STREAM_VSTART 0x1a0 +#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0 0x1a4 +#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_SYNC BIT(0) +#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_FORMAT_SHIFT 1 +#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_DYNAMIC_RANGE BIT(3) +#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_YCBCR_COLRIMETRY BIT(4) +#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_BPC_SHIFT 5 +#define ZYNQMP_DP_TX_MAIN_STREAM_MISC1 0x1a8 +#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_INTERLACED_VERT BIT(0) +#define ZYNQMP_DP_TX_MAIN_STREAM_MISC0_STEREO_VID_SHIFT 1 +#define ZYNQMP_DP_TX_M_VID 0x1ac +#define ZYNQMP_DP_TX_TRANSFER_UNIT_SIZE 0x1b0 +#define ZYNQMP_DP_TX_DEF_TRANSFER_UNIT_SIZE 64 +#define ZYNQMP_DP_TX_N_VID 0x1b4 +#define ZYNQMP_DP_TX_USER_PIXEL_WIDTH 0x1b8 +#define ZYNQMP_DP_TX_USER_DATA_CNT_PER_LANE 0x1bc +#define ZYNQMP_DP_TX_MIN_BYTES_PER_TU 0x1c4 +#define ZYNQMP_DP_TX_FRAC_BYTES_PER_TU 0x1c8 +#define ZYNQMP_DP_TX_INIT_WAIT 0x1cc + +/* PHY configuration and status registers */ +#define ZYNQMP_DP_TX_PHY_CONFIG 0x200 +#define ZYNQMP_DP_TX_PHY_CONFIG_PHY_RESET BIT(0) +#define ZYNQMP_DP_TX_PHY_CONFIG_GTTX_RESET BIT(1) +#define ZYNQMP_DP_TX_PHY_CONFIG_PHY_PMA_RESET BIT(8) +#define ZYNQMP_DP_TX_PHY_CONFIG_PHY_PCS_RESET BIT(9) +#define ZYNQMP_DP_TX_PHY_CONFIG_ALL_RESET (ZYNQMP_DP_TX_PHY_CONFIG_PHY_RESET | \ + ZYNQMP_DP_TX_PHY_CONFIG_GTTX_RESET | \ + ZYNQMP_DP_TX_PHY_CONFIG_PHY_PMA_RESET | \ + ZYNQMP_DP_TX_PHY_CONFIG_PHY_PCS_RESET) +#define ZYNQMP_DP_TX_PHY_PREEMPHASIS_LANE_0 0x210 +#define ZYNQMP_DP_TX_PHY_PREEMPHASIS_LANE_1 0x214 +#define ZYNQMP_DP_TX_PHY_PREEMPHASIS_LANE_2 0x218 +#define ZYNQMP_DP_TX_PHY_PREEMPHASIS_LANE_3 0x21c +#define ZYNQMP_DP_TX_PHY_VOLTAGE_DIFF_LANE_0 0x220 +#define ZYNQMP_DP_TX_PHY_VOLTAGE_DIFF_LANE_1 0x224 +#define ZYNQMP_DP_TX_PHY_VOLTAGE_DIFF_LANE_2 0x228 +#define ZYNQMP_DP_TX_PHY_VOLTAGE_DIFF_LANE_3 0x22c +#define ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING 0x234 +#define ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_162 0x1 +#define ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_270 0x3 +#define ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_540 0x5 +#define ZYNQMP_DP_TX_PHY_POWER_DOWN 0x238 +#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_0 BIT(0) +#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_1 BIT(1) +#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2 BIT(2) +#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3 BIT(3) +#define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL 0xf +#define ZYNQMP_DP_TX_PHY_PRECURSOR_LANE_0 0x23c +#define ZYNQMP_DP_TX_PHY_PRECURSOR_LANE_1 0x240 +#define ZYNQMP_DP_TX_PHY_PRECURSOR_LANE_2 0x244 +#define ZYNQMP_DP_TX_PHY_PRECURSOR_LANE_3 0x248 +#define ZYNQMP_DP_TX_PHY_POSTCURSOR_LANE_0 0x24c +#define ZYNQMP_DP_TX_PHY_POSTCURSOR_LANE_1 0x250 +#define ZYNQMP_DP_TX_PHY_POSTCURSOR_LANE_2 0x254 +#define ZYNQMP_DP_TX_PHY_POSTCURSOR_LANE_3 0x258 +#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 0x24c +#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_1 0x250 +#define ZYNQMP_DP_TX_PHY_STATUS 0x280 +#define ZYNQMP_DP_TX_PHY_STATUS_PLL_LOCKED_SHIFT 4 +#define ZYNQMP_DP_TX_PHY_STATUS_FPGA_PLL_LOCKED BIT(6) + +/* Audio registers */ +#define ZYNQMP_DP_TX_AUDIO_CONTROL 0x300 +#define ZYNQMP_DP_TX_AUDIO_CHANNELS 0x304 +#define ZYNQMP_DP_TX_AUDIO_INFO_DATA 0x308 +#define ZYNQMP_DP_TX_AUDIO_M_AUD 0x328 +#define ZYNQMP_DP_TX_AUDIO_N_AUD 0x32c +#define ZYNQMP_DP_TX_AUDIO_EXT_DATA 0x330 + +#define ZYNQMP_DP_MISC0_RGB (0) +#define ZYNQMP_DP_MISC0_YCRCB_422 (5 << 1) +#define ZYNQMP_DP_MISC0_YCRCB_444 (6 << 1) +#define ZYNQMP_DP_MISC0_FORMAT_MASK 0xe +#define ZYNQMP_DP_MISC0_BPC_6 (0 << 5) +#define ZYNQMP_DP_MISC0_BPC_8 (1 << 5) +#define ZYNQMP_DP_MISC0_BPC_10 (2 << 5) +#define ZYNQMP_DP_MISC0_BPC_12 (3 << 5) +#define ZYNQMP_DP_MISC0_BPC_16 (4 << 5) +#define ZYNQMP_DP_MISC0_BPC_MASK 0xe0 +#define ZYNQMP_DP_MISC1_Y_ONLY (1 << 7) + +#define ZYNQMP_DP_MAX_LANES 2 +#define ZYNQMP_MAX_FREQ 3000000 + +#define DP_REDUCED_BIT_RATE 162000 +#define DP_HIGH_BIT_RATE 270000 +#define DP_HIGH_BIT_RATE2 540000 +#define DP_MAX_TRAINING_TRIES 5 +#define DP_V1_2 0x12 + +/** + * struct zynqmp_dp_link_config - Common link config between source and sink + * @max_rate: maximum link rate + * @max_lanes: maximum number of lanes + */ +struct zynqmp_dp_link_config { + int max_rate; + u8 max_lanes; +}; + +/** + * struct zynqmp_dp_mode - Configured mode of DisplayPort + * @bw_code: code for bandwidth(link rate) + * @lane_cnt: number of lanes + * @pclock: pixel clock frequency of current mode + * @fmt: format identifier string + */ +struct zynqmp_dp_mode { + u8 bw_code; + u8 lane_cnt; + int pclock; + const char *fmt; +}; + +/** + * struct zynqmp_dp_config - Configuration of DisplayPort from DTS + * @misc0: misc0 configuration (per DP v1.2 spec) + * @misc1: misc1 configuration (per DP v1.2 spec) + * @bpp: bits per pixel + * @bpc: bits per component + * @num_colors: number of color components + */ +struct zynqmp_dp_config { + u8 misc0; + u8 misc1; + u8 bpp; + u8 bpc; + u8 num_colors; +}; + +/** + * struct zynqmp_dp - Xilinx DisplayPort core + * @encoder: the drm encoder structure + * @connector: the drm connector structure + * @sync_prop: synchronous mode property + * @bpc_prop: bpc mode property + * @dev: device structure + * @dpsub: Display subsystem + * @drm: DRM core + * @iomem: device I/O memory for register access + * @irq: irq + * @config: IP core configuration from DTS + * @aux: aux channel + * @phy: PHY handles for DP lanes + * @num_lanes: number of enabled phy lanes + * @hpd_work: hot plug detection worker + * @status: connection status + * @enabled: flag to indicate if the device is enabled + * @dpms: current dpms state + * @dpcd: DP configuration data from currently connected sink device + * @link_config: common link configuration between IP core and sink device + * @mode: current mode between IP core and sink device + * @train_set: set of training data + */ +struct zynqmp_dp { + struct drm_encoder encoder; + struct drm_connector connector; + struct drm_property *sync_prop; + struct drm_property *bpc_prop; + struct device *dev; + struct zynqmp_dpsub *dpsub; + struct drm_device *drm; + void __iomem *iomem; + int irq; + + struct zynqmp_dp_config config; + struct drm_dp_aux aux; + struct phy *phy[ZYNQMP_DP_MAX_LANES]; + u8 num_lanes; + struct delayed_work hpd_work; + enum drm_connector_status status; + bool enabled; + + int dpms; + u8 dpcd[DP_RECEIVER_CAP_SIZE]; + struct zynqmp_dp_link_config link_config; + struct zynqmp_dp_mode mode; + u8 train_set[ZYNQMP_DP_MAX_LANES]; +}; + +static inline struct zynqmp_dp *encoder_to_dp(struct drm_encoder *encoder) +{ + return container_of(encoder, struct zynqmp_dp, encoder); +} + +static inline struct zynqmp_dp *connector_to_dp(struct drm_connector *connector) +{ + return container_of(connector, struct zynqmp_dp, connector); +} + +static void zynqmp_dp_write(void __iomem *base, int offset, u32 val) +{ + writel(val, base + offset); +} + +static u32 zynqmp_dp_read(void __iomem *base, int offset) +{ + return readl(base + offset); +} + +static void zynqmp_dp_clr(void __iomem *base, int offset, u32 clr) +{ + zynqmp_dp_write(base, offset, zynqmp_dp_read(base, offset) & ~clr); +} + +static void zynqmp_dp_set(void __iomem *base, int offset, u32 set) +{ + zynqmp_dp_write(base, offset, zynqmp_dp_read(base, offset) | set); +} + +/* + * Internal functions: used by zynqmp_disp.c + */ + +/** + * zynqmp_dp_update_bpp - Update the current bpp config + * @dp: DisplayPort IP core structure + * + * Update the current bpp based on the color format: bpc & num_colors. + * Any function that changes bpc or num_colors should call this + * to keep the bpp value in sync. + */ +static void zynqmp_dp_update_bpp(struct zynqmp_dp *dp) +{ + struct zynqmp_dp_config *config = &dp->config; + + config->bpp = dp->config.bpc * dp->config.num_colors; +} + +/** + * zynqmp_dp_set_color - Set the color + * @dp: DisplayPort IP core structure + * @color: color string, from zynqmp_disp_color_enum + * + * Update misc register values based on @color string. + * + * Return: 0 on success, or -EINVAL. + */ +int zynqmp_dp_set_color(struct zynqmp_dp *dp, const char *color) +{ + struct zynqmp_dp_config *config = &dp->config; + + config->misc0 &= ~ZYNQMP_DP_MISC0_FORMAT_MASK; + config->misc1 &= ~ZYNQMP_DP_MISC1_Y_ONLY; + if (strcmp(color, "rgb") == 0) { + config->misc0 |= ZYNQMP_DP_MISC0_RGB; + config->num_colors = 3; + } else if (strcmp(color, "ycrcb422") == 0) { + config->misc0 |= ZYNQMP_DP_MISC0_YCRCB_422; + config->num_colors = 2; + } else if (strcmp(color, "ycrcb444") == 0) { + config->misc0 |= ZYNQMP_DP_MISC0_YCRCB_444; + config->num_colors = 3; + } else if (strcmp(color, "yonly") == 0) { + config->misc1 |= ZYNQMP_DP_MISC1_Y_ONLY; + config->num_colors = 1; + } else { + dev_err(dp->dev, "Invalid colormetry in DT\n"); + return -EINVAL; + } + zynqmp_dp_update_bpp(dp); + + return 0; +} + +/** + * zynqmp_dp_enable_vblank - Enable vblank + * @dp: DisplayPort IP core structure + * + * Enable vblank interrupt + */ +void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp) +{ + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_EN, + ZYNQMP_DP_TX_INTR_VBLANK_START); +} + +/** + * zynqmp_dp_disable_vblank - Disable vblank + * @dp: DisplayPort IP core structure + * + * Disable vblank interrupt + */ +void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp) +{ + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_DS, + ZYNQMP_DP_TX_INTR_VBLANK_START); +} + +/* + * DP PHY functions + */ + +/** + * zynqmp_dp_init_phy - Initialize the phy + * @dp: DisplayPort IP core structure + * + * Initialize the phy. + * + * Return: 0 if the phy instances are initialized correctly, or the error code + * returned from the callee functions. + * Note: We can call this function without any phy lane assigned to DP. + */ +static int zynqmp_dp_init_phy(struct zynqmp_dp *dp) +{ + unsigned int i; + int ret; + + for (i = 0; i < dp->num_lanes; i++) { + ret = phy_init(dp->phy[i]); + if (ret) { + dev_err(dp->dev, "failed to init phy lane %d\n", i); + return ret; + } + } + /* Wait for PLL to be locked for the primary (1st) lane */ + if (dp->phy[0]) { + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_DS, + ZYNQMP_DP_TX_INTR_ALL); + zynqmp_dp_clr(dp->iomem, ZYNQMP_DP_TX_PHY_CONFIG, + ZYNQMP_DP_TX_PHY_CONFIG_ALL_RESET); + ret = xpsgtr_wait_pll_lock(dp->phy[0]); + if (ret) { + dev_err(dp->dev, "failed to lock pll\n"); + return ret; + } + } + + return 0; +} + +/** + * zynqmp_dp_exit_phy - Exit the phy + * @dp: DisplayPort IP core structure + * + * Exit the phy. + */ +static void zynqmp_dp_exit_phy(struct zynqmp_dp *dp) +{ + unsigned int i; + int ret; + + for (i = 0; i < dp->num_lanes; i++) { + ret = phy_exit(dp->phy[i]); + if (ret) + dev_err(dp->dev, "failed to exit phy(%d) %d\n", i, ret); + } +} + +/** + * zynqmp_dp_phy_ready - Check if PHY is ready + * @dp: DisplayPort IP core structure + * + * Check if PHY is ready. If PHY is not ready, wait 1ms to check for 100 times. + * This amount of delay was suggested by IP designer. + * + * Return: 0 if PHY is ready, or -ENODEV if PHY is not ready. + */ +static int zynqmp_dp_phy_ready(struct zynqmp_dp *dp) +{ + u32 i, reg, ready; + + ready = (1 << dp->num_lanes) - 1; + + /* Wait for 100 * 1ms. This should be enough time for PHY to be ready */ + for (i = 0; ; i++) { + reg = zynqmp_dp_read(dp->iomem, ZYNQMP_DP_TX_PHY_STATUS); + if ((reg & ready) == ready) + return 0; + + if (i == 100) { + dev_err(dp->dev, "PHY isn't ready\n"); + return -ENODEV; + } + + usleep_range(1000, 1100); + } + + return 0; +} + +/* + * Power Management functions + */ +/** + * zynqmp_dp_pm_resume - Resume DP IP + * @dp: DisplayPort IP core structure + * + * Resume the DP IP including PHY and pipeline. + */ +void zynqmp_dp_pm_resume(struct zynqmp_dp *dp) +{ + zynqmp_dp_init_phy(dp); +} +/** + * zynqmp_dp_pm_suspend - Suspend DP IP + * @dp: DisplayPort IP core structure + * + * Suspend the DP IP including PHY and pipeline. + */ +void zynqmp_dp_pm_suspend(struct zynqmp_dp *dp) +{ + zynqmp_dp_exit_phy(dp); +} +/* + * DP functions + */ + +/** + * zynqmp_dp_max_rate - Calculate and return available max pixel clock + * @link_rate: link rate (Kilo-bytes / sec) + * @lane_num: number of lanes + * @bpp: bits per pixel + * + * Return: max pixel clock (KHz) supported by current link config. + */ +static inline int zynqmp_dp_max_rate(int link_rate, u8 lane_num, u8 bpp) +{ + return link_rate * lane_num * 8 / bpp; +} + +/** + * zynqmp_dp_mode_configure - Configure the link values + * @dp: DisplayPort IP core structure + * @pclock: pixel clock for requested display mode + * @current_bw: current link rate + * + * Find the link configuration values, rate and lane count for requested pixel + * clock @pclock. The @pclock is stored in the mode to be used in other + * functions later. The returned rate is downshifted from the current rate + * @current_bw. + * + * Return: Current link rate code, or -EINVAL. + */ +static int zynqmp_dp_mode_configure(struct zynqmp_dp *dp, int pclock, + u8 current_bw) +{ + int max_rate = dp->link_config.max_rate; + u8 bws[3] = { DP_LINK_BW_1_62, DP_LINK_BW_2_7, DP_LINK_BW_5_4 }; + u8 max_lanes = dp->link_config.max_lanes; + u8 max_link_rate_code = drm_dp_link_rate_to_bw_code(max_rate); + u8 bpp = dp->config.bpp; + u8 lane_cnt; + s8 i; + + if (current_bw == DP_LINK_BW_1_62) { + dev_err(dp->dev, "can't downshift. already lowest link rate\n"); + return -EINVAL; + } + + for (i = ARRAY_SIZE(bws) - 1; i >= 0; i--) { + if (current_bw && bws[i] >= current_bw) + continue; + + if (bws[i] <= max_link_rate_code) + break; + } + + for (lane_cnt = 1; lane_cnt <= max_lanes; lane_cnt <<= 1) { + int bw; + u32 rate; + + bw = drm_dp_bw_code_to_link_rate(bws[i]); + rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp); + if (pclock <= rate) { + dp->mode.bw_code = bws[i]; + dp->mode.lane_cnt = lane_cnt; + dp->mode.pclock = pclock; + return dp->mode.bw_code; + } + } + + dev_err(dp->dev, "failed to configure link values\n"); + + return -EINVAL; +} + +/** + * zynqmp_dp_adjust_train - Adjust train values + * @dp: DisplayPort IP core structure + * @link_status: link status from sink which contains requested training values + */ +static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp, + u8 link_status[DP_LINK_STATUS_SIZE]) +{ + u8 *train_set = dp->train_set; + u8 voltage = 0, preemphasis = 0; + u8 i; + + for (i = 0; i < dp->mode.lane_cnt; i++) { + u8 v = drm_dp_get_adjust_request_voltage(link_status, i); + u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i); + + if (v > voltage) + voltage = v; + + if (p > preemphasis) + preemphasis = p; + } + + if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3) + voltage |= DP_TRAIN_MAX_SWING_REACHED; + + if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2) + preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; + + for (i = 0; i < dp->mode.lane_cnt; i++) + train_set[i] = voltage | preemphasis; +} + +/** + * zynqmp_dp_update_vs_emph - Update the training values + * @dp: DisplayPort IP core structure + * + * Update the training values based on the request from sink. The mapped values + * are predefined, and values(vs, pe, pc) are from the device manual. + * + * Return: 0 if vs and emph are updated successfully, or the error code returned + * by drm_dp_dpcd_write(). + */ +static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp) +{ + u8 *train_set = dp->train_set; + u8 i, v_level, p_level; + int ret; + + ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, train_set, + dp->mode.lane_cnt); + if (ret < 0) + return ret; + + for (i = 0; i < dp->mode.lane_cnt; i++) { + u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4; + + v_level = (train_set[i] & DP_TRAIN_VOLTAGE_SWING_MASK) >> + DP_TRAIN_VOLTAGE_SWING_SHIFT; + p_level = (train_set[i] & DP_TRAIN_PRE_EMPHASIS_MASK) >> + DP_TRAIN_PRE_EMPHASIS_SHIFT; + + xpsgtr_margining_factor(dp->phy[i], p_level, v_level); + xpsgtr_override_deemph(dp->phy[i], p_level, v_level); + zynqmp_dp_write(dp->iomem, reg, 0x2); + } + + return 0; +} + +/** + * zynqmp_dp_link_train_cr - Train clock recovery + * @dp: DisplayPort IP core structure + * + * Return: 0 if clock recovery train is done successfully, or corresponding + * error code. + */ +static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp) +{ + u8 link_status[DP_LINK_STATUS_SIZE]; + u8 lane_cnt = dp->mode.lane_cnt; + u8 vs = 0, tries = 0; + u16 max_tries, i; + bool cr_done; + int ret; + + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_1); + ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_1 | + DP_LINK_SCRAMBLING_DISABLE); + if (ret < 0) + return ret; + + /* + * 256 loops should be maximum iterations for 4 lanes and 4 values. + * So, This loop should exit before 512 iterations + */ + for (max_tries = 0; max_tries < 512; max_tries++) { + ret = zynqmp_dp_update_vs_emph(dp); + if (ret) + return ret; + + drm_dp_link_train_clock_recovery_delay(dp->dpcd); + ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status); + if (ret < 0) + return ret; + + cr_done = drm_dp_clock_recovery_ok(link_status, lane_cnt); + if (cr_done) + break; + + for (i = 0; i < lane_cnt; i++) + if (!(dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED)) + break; + if (i == lane_cnt) + break; + + if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == vs) + tries++; + else + tries = 0; + + if (tries == DP_MAX_TRAINING_TRIES) + break; + + vs = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; + zynqmp_dp_adjust_train(dp, link_status); + } + + if (!cr_done) + return -EIO; + + return 0; +} + +/** + * zynqmp_dp_link_train_ce - Train channel equalization + * @dp: DisplayPort IP core structure + * + * Return: 0 if channel equalization train is done successfully, or + * corresponding error code. + */ +static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp) +{ + u8 link_status[DP_LINK_STATUS_SIZE]; + u8 lane_cnt = dp->mode.lane_cnt; + u32 pat, tries; + int ret; + bool ce_done; + + if (dp->dpcd[DP_DPCD_REV] >= DP_V1_2 && + dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED) + pat = DP_TRAINING_PATTERN_3; + else + pat = DP_TRAINING_PATTERN_2; + + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_TRAINING_PATTERN_SET, pat); + ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, + pat | DP_LINK_SCRAMBLING_DISABLE); + if (ret < 0) + return ret; + + for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) { + ret = zynqmp_dp_update_vs_emph(dp); + if (ret) + return ret; + + drm_dp_link_train_channel_eq_delay(dp->dpcd); + ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status); + if (ret < 0) + return ret; + + ce_done = drm_dp_channel_eq_ok(link_status, lane_cnt); + if (ce_done) + break; + + zynqmp_dp_adjust_train(dp, link_status); + } + + if (!ce_done) + return -EIO; + + return 0; +} + +/** + * zynqmp_dp_link_train - Train the link + * @dp: DisplayPort IP core structure + * + * Return: 0 if all trains are done successfully, or corresponding error code. + */ +static int zynqmp_dp_train(struct zynqmp_dp *dp) +{ + u32 reg; + u8 bw_code = dp->mode.bw_code; + u8 lane_cnt = dp->mode.lane_cnt; + u8 aux_lane_cnt = lane_cnt; + bool enhanced; + int ret; + + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_LANE_CNT_SET, lane_cnt); + enhanced = drm_dp_enhanced_frame_cap(dp->dpcd); + if (enhanced) { + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_ENHANCED_FRAME_EN, 1); + aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN; + } + + if (dp->dpcd[3] & 0x1) { + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_DOWNSPREAD_CTL, 1); + drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, + DP_SPREAD_AMP_0_5); + } else { + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_DOWNSPREAD_CTL, 0); + drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 0); + } + + ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, aux_lane_cnt); + if (ret < 0) { + dev_err(dp->dev, "failed to set lane count\n"); + return ret; + } + + ret = drm_dp_dpcd_writeb(&dp->aux, DP_MAIN_LINK_CHANNEL_CODING_SET, + DP_SET_ANSI_8B10B); + if (ret < 0) { + dev_err(dp->dev, "failed to set ANSI 8B/10B encoding\n"); + return ret; + } + + ret = drm_dp_dpcd_writeb(&dp->aux, DP_LINK_BW_SET, bw_code); + if (ret < 0) { + dev_err(dp->dev, "failed to set DP bandwidth\n"); + return ret; + } + + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_LINK_BW_SET, bw_code); + switch (bw_code) { + case DP_LINK_BW_1_62: + reg = ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_162; + break; + case DP_LINK_BW_2_7: + reg = ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_270; + break; + case DP_LINK_BW_5_4: + default: + reg = ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING_540; + break; + } + + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_PHY_CLOCK_FEEDBACK_SETTING, + reg); + ret = zynqmp_dp_phy_ready(dp); + if (ret < 0) + return ret; + + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_SCRAMBLING_DISABLE, 1); + memset(dp->train_set, 0, 4); + ret = zynqmp_dp_link_train_cr(dp); + if (ret) + return ret; + + ret = zynqmp_dp_link_train_ce(dp); + if (ret) + return ret; + + ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_DISABLE); + if (ret < 0) { + dev_err(dp->dev, "failed to disable training pattern\n"); + return ret; + } + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_TRAINING_PATTERN_SET, + DP_TRAINING_PATTERN_DISABLE); + + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_SCRAMBLING_DISABLE, 0); + + return 0; +} + +/** + * zynqmp_dp_train_loop - Downshift the link rate during training + * @dp: DisplayPort IP core structure + * + * Train the link by downshifting the link rate if training is not successful. + */ +static void zynqmp_dp_train_loop(struct zynqmp_dp *dp) +{ + struct zynqmp_dp_mode *mode = &dp->mode; + u8 bw = mode->bw_code; + int ret; + + do { + if (dp->status == connector_status_disconnected || + !dp->enabled) + return; + + ret = zynqmp_dp_train(dp); + if (!ret) + return; + + ret = zynqmp_dp_mode_configure(dp, mode->pclock, bw); + if (ret < 0) + goto err_out; + + bw = ret; + } while (bw >= DP_LINK_BW_1_62); + +err_out: + dev_err(dp->dev, "failed to train the DP link\n"); +} + +/* + * DP Aux functions + */ + +#define AUX_READ_BIT 0x1 + +/** + * zynqmp_dp_aux_cmd_submit - Submit aux command + * @dp: DisplayPort IP core structure + * @cmd: aux command + * @addr: aux address + * @buf: buffer for command data + * @bytes: number of bytes for @buf + * @reply: reply code to be returned + * + * Submit an aux command. All aux related commands, native or i2c aux + * read/write, are submitted through this function. The function is mapped to + * the transfer function of struct drm_dp_aux. This function involves in + * multiple register reads/writes, thus synchronization is needed, and it is + * done by drm_dp_helper using @hw_mutex. The calling thread goes into sleep + * if there's no immediate reply to the command submission. The reply code is + * returned at @reply if @reply != NULL. + * + * Return: 0 if the command is submitted properly, or corresponding error code: + * -EBUSY when there is any request already being processed + * -ETIMEDOUT when receiving reply is timed out + * -EIO when received bytes are less than requested + */ +static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr, + u8 *buf, u8 bytes, u8 *reply) +{ + bool is_read = (cmd & AUX_READ_BIT) ? true : false; + void __iomem *iomem = dp->iomem; + u32 reg, i; + + reg = zynqmp_dp_read(iomem, ZYNQMP_DP_TX_INTR_SIGNAL_STATE); + if (reg & ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REQUEST) + return -EBUSY; + + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUX_ADDRESS, addr); + if (!is_read) + for (i = 0; i < bytes; i++) + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUX_WRITE_FIFO, + buf[i]); + + reg = cmd << ZYNQMP_DP_TX_AUX_COMMAND_CMD_SHIFT; + if (!buf || !bytes) + reg |= ZYNQMP_DP_TX_AUX_COMMAND_ADDRESS_ONLY; + else + reg |= (bytes - 1) << ZYNQMP_DP_TX_AUX_COMMAND_BYTES_SHIFT; + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUX_COMMAND, reg); + + /* Wait for reply to be delivered upto 2ms */ + for (i = 0; ; i++) { + reg = zynqmp_dp_read(iomem, ZYNQMP_DP_TX_INTR_SIGNAL_STATE); + if (reg & ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REPLY) + break; + + if (reg & ZYNQMP_DP_TX_INTR_SIGNAL_STATE_REPLY_TIMEOUT || + i == 2) + return -ETIMEDOUT; + + usleep_range(1000, 1100); + } + + reg = zynqmp_dp_read(iomem, ZYNQMP_DP_TX_AUX_REPLY_CODE); + if (reply) + *reply = reg; + + if (is_read && + (reg == ZYNQMP_DP_TX_AUX_REPLY_CODE_AUX_ACK || + reg == ZYNQMP_DP_TX_AUX_REPLY_CODE_I2C_ACK)) { + reg = zynqmp_dp_read(iomem, ZYNQMP_DP_TX_REPLY_DATA_CNT); + if ((reg & ZYNQMP_DP_TX_AUX_REPLY_CNT_MASK) != bytes) + return -EIO; + + for (i = 0; i < bytes; i++) { + buf[i] = zynqmp_dp_read(iomem, + ZYNQMP_DP_TX_AUX_REPLY_DATA); + } + } + + return 0; +} + +static ssize_t +zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) +{ + struct zynqmp_dp *dp = container_of(aux, struct zynqmp_dp, aux); + int ret; + unsigned int i, iter; + + /* Number of loops = timeout in msec / aux delay (400 usec) */ + iter = zynqmp_dp_aux_timeout_ms * 1000 / 400; + iter = iter ? iter : 1; + + for (i = 0; i < iter; i++) { + ret = zynqmp_dp_aux_cmd_submit(dp, msg->request, msg->address, + msg->buffer, msg->size, + &msg->reply); + if (!ret) { + dev_dbg(dp->dev, "aux %d retries\n", i); + return msg->size; + } + + if (dp->status == connector_status_disconnected) { + dev_dbg(dp->dev, "no connected aux device\n"); + return -ENODEV; + } + + usleep_range(400, 500); + } + + dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret); + + return ret; +} + +/** + * zynqmp_dp_init_aux - Initialize the DP aux + * @dp: DisplayPort IP core structure + * + * Initialize the DP aux. The aux clock is derived from the axi clock, so + * this function gets the axi clock frequency and calculates the filter + * value. Additionally, the interrupts and transmitter are enabled. + * + * Return: 0 on success, error value otherwise + */ +static int zynqmp_dp_init_aux(struct zynqmp_dp *dp) +{ + unsigned int rate; + u32 reg, w; + + rate = zynqmp_disp_get_apb_clk_rate(dp->dpsub->disp); + if (rate < ZYNQMP_DP_TX_CLK_DIVIDER_MHZ) { + dev_err(dp->dev, "aclk should be higher than 1MHz\n"); + return -EINVAL; + } + + /* Allowable values for this register are: 8, 16, 24, 32, 40, 48 */ + for (w = 8; w <= 48; w += 8) { + /* AUX pulse width should be between 0.4 to 0.6 usec */ + if (w >= (4 * rate / 10000000) && + w <= (6 * rate / 10000000)) + break; + } + + if (w > 48) { + dev_err(dp->dev, "aclk frequency too high\n"); + return -EINVAL; + } + reg = w << ZYNQMP_DP_TX_CLK_DIVIDER_AUX_FILTER_SHIFT; + reg |= rate / ZYNQMP_DP_TX_CLK_DIVIDER_MHZ; + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_CLK_DIVIDER, reg); + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_EN, + ZYNQMP_DP_TX_INTR_ALL); + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_DS, + ZYNQMP_DP_TX_NO_INTR_ALL); + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_ENABLE, 1); + + return 0; +} + +/** + * zynqmp_dp_exit_aux - De-initialize the DP aux + * @dp: DisplayPort IP core structure + * + * De-initialize the DP aux. Disable all interrupts which are enabled + * through aux initialization, as well as the transmitter. + */ +static void zynqmp_dp_exit_aux(struct zynqmp_dp *dp) +{ + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_ENABLE, 0); + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_DS, 0xffffffff); +} + +/* + * Generic DP functions + */ + +/** + * zynqmp_dp_update_misc - Write the misc registers + * @dp: DisplayPort IP core structure + * + * The misc register values are stored in the structure, and this + * function applies the values into the registers. + */ +static void zynqmp_dp_update_misc(struct zynqmp_dp *dp) +{ + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_MAIN_STREAM_MISC0, + dp->config.misc0); + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_MAIN_STREAM_MISC1, + dp->config.misc1); +} + +/** + * zynqmp_dp_set_sync_mode - Set the sync mode bit in the software misc state + * @dp: DisplayPort IP core structure + * @mode: flag if the sync mode should be on or off + * + * Set the bit in software misc state. To apply to hardware, + * zynqmp_dp_update_misc() should be called. + */ +static void zynqmp_dp_set_sync_mode(struct zynqmp_dp *dp, bool mode) +{ + struct zynqmp_dp_config *config = &dp->config; + + if (mode) + config->misc0 |= ZYNQMP_DP_TX_MAIN_STREAM_MISC0_SYNC; + else + config->misc0 &= ~ZYNQMP_DP_TX_MAIN_STREAM_MISC0_SYNC; +} + +/** + * zynqmp_dp_get_sync_mode - Get the sync mode state + * @dp: DisplayPort IP core structure + * + * Return: true if the sync mode is on, or false + */ +static bool zynqmp_dp_get_sync_mode(struct zynqmp_dp *dp) +{ + struct zynqmp_dp_config *config = &dp->config; + + return !!(config->misc0 & ZYNQMP_DP_TX_MAIN_STREAM_MISC0_SYNC); +} + +/** + * zynqmp_dp_set_bpc - Set bpc value in software misc state + * @dp: DisplayPort IP core structure + * @bpc: bits per component + * + * Return: 0 on success, or the fallback bpc value + */ +static u8 zynqmp_dp_set_bpc(struct zynqmp_dp *dp, u8 bpc) +{ + struct zynqmp_dp_config *config = &dp->config; + u8 ret = 0; + + if (dp->connector.display_info.bpc && + dp->connector.display_info.bpc != bpc) { + dev_err(dp->dev, "requested bpc (%u) != display info (%u)\n", + bpc, dp->connector.display_info.bpc); + bpc = dp->connector.display_info.bpc; + } + + config->misc0 &= ~ZYNQMP_DP_MISC0_BPC_MASK; + switch (bpc) { + case 6: + config->misc0 |= ZYNQMP_DP_MISC0_BPC_6; + break; + case 8: + config->misc0 |= ZYNQMP_DP_MISC0_BPC_8; + break; + case 10: + config->misc0 |= ZYNQMP_DP_MISC0_BPC_10; + break; + case 12: + config->misc0 |= ZYNQMP_DP_MISC0_BPC_12; + break; + case 16: + config->misc0 |= ZYNQMP_DP_MISC0_BPC_16; + break; + default: + dev_err(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n", + bpc); + config->misc0 |= ZYNQMP_DP_MISC0_BPC_8; + ret = 8; + break; + } + config->bpc = bpc; + zynqmp_dp_update_bpp(dp); + + return ret; +} + +/** + * zynqmp_dp_get_bpc - Set bpc value from software state + * @dp: DisplayPort IP core structure + * + * Return: current bpc value + */ +static u8 zynqmp_dp_get_bpc(struct zynqmp_dp *dp) +{ + return dp->config.bpc; +} + +/** + * zynqmp_dp_encoder_mode_set_transfer_unit - Set the transfer unit values + * @dp: DisplayPort IP core structure + * @mode: requested display mode + * + * Set the transfer unit, and caculate all transfer unit size related values. + * Calculation is based on DP and IP core specification. + */ +static void +zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp *dp, + struct drm_display_mode *mode) +{ + u32 tu = ZYNQMP_DP_TX_DEF_TRANSFER_UNIT_SIZE; + u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait; + + /* Use the max transfer unit size (default) */ + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_TRANSFER_UNIT_SIZE, tu); + + vid_kbytes = mode->clock * (dp->config.bpp / 8); + bw = drm_dp_bw_code_to_link_rate(dp->mode.bw_code); + avg_bytes_per_tu = vid_kbytes * tu / (dp->mode.lane_cnt * bw / 1000); + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_MIN_BYTES_PER_TU, + avg_bytes_per_tu / 1000); + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_FRAC_BYTES_PER_TU, + avg_bytes_per_tu % 1000); + + /* Configure the initial wait cycle based on transfer unit size */ + if (tu < (avg_bytes_per_tu / 1000)) + init_wait = 0; + else if ((avg_bytes_per_tu / 1000) <= 4) + init_wait = tu; + else + init_wait = tu - avg_bytes_per_tu / 1000; + + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_INIT_WAIT, init_wait); +} + +/** + * zynqmp_dp_encoder_mode_set_stream - Configure the main stream + * @dp: DisplayPort IP core structure + * @mode: requested display mode + * + * Configure the main stream based on the requested mode @mode. Calculation is + * based on IP core specification. + */ +void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp, + struct drm_display_mode *mode) +{ + void __iomem *iomem = dp->iomem; + u8 lane_cnt = dp->mode.lane_cnt; + u32 reg, wpl; + unsigned int rate; + + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_HTOTAL, mode->htotal); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_VTOTAL, mode->vtotal); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_POLARITY, + (!!(mode->flags & DRM_MODE_FLAG_PVSYNC) << + ZYNQMP_DP_TX_MAIN_STREAM_POLARITY_VSYNC_SHIFT) | + (!!(mode->flags & DRM_MODE_FLAG_PHSYNC) << + ZYNQMP_DP_TX_MAIN_STREAM_POLARITY_HSYNC_SHIFT)); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_HSWIDTH, + mode->hsync_end - mode->hsync_start); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_VSWIDTH, + mode->vsync_end - mode->vsync_start); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_HRES, mode->hdisplay); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_VRES, mode->vdisplay); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_HSTART, + mode->htotal - mode->hsync_start); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_MAIN_STREAM_VSTART, + mode->vtotal - mode->vsync_start); + + /* In synchronous mode, set the diviers */ + if (dp->config.misc0 & ZYNQMP_DP_TX_MAIN_STREAM_MISC0_SYNC) { + reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_N_VID, reg); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_M_VID, mode->clock); + rate = zynqmp_disp_get_aud_clk_rate(dp->dpsub->disp); + if (rate) { + dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_N_AUD, reg); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_M_AUD, + rate / 1000); + } + } + + /* Only 2 channel audio is supported now */ + if (zynqmp_disp_aud_enabled(dp->dpsub->disp)) + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1); + + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_USER_PIXEL_WIDTH, 1); + + /* Translate to the native 16 bit datapath based on IP core spec */ + wpl = (mode->hdisplay * dp->config.bpp + 15) / 16; + reg = wpl + wpl % lane_cnt - lane_cnt; + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_USER_DATA_CNT_PER_LANE, reg); +} + +/* + * DRM connector functions + */ + +static enum drm_connector_status +zynqmp_dp_connector_detect(struct drm_connector *connector, bool force) +{ + struct zynqmp_dp *dp = connector_to_dp(connector); + struct zynqmp_dp_link_config *link_config = &dp->link_config; + u32 state, i; + int ret; + + /* + * This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to + * get the HPD signal with some monitors. + */ + for (i = 0; i < 10; i++) { + state = zynqmp_dp_read(dp->iomem, + ZYNQMP_DP_TX_INTR_SIGNAL_STATE); + if (state & ZYNQMP_DP_TX_INTR_SIGNAL_STATE_HPD) + break; + msleep(100); + } + + if (state & ZYNQMP_DP_TX_INTR_SIGNAL_STATE_HPD) { + dp->status = connector_status_connected; + ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd, + sizeof(dp->dpcd)); + if (ret < 0) { + dev_dbg(dp->dev, "DPCD read first try fails"); + ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd, + sizeof(dp->dpcd)); + if (ret < 0) { + dev_dbg(dp->dev, "DPCD read retry fails"); + goto disconnected; + } + } + + link_config->max_rate = min_t(int, + drm_dp_max_link_rate(dp->dpcd), + DP_HIGH_BIT_RATE2); + link_config->max_lanes = min_t(u8, + drm_dp_max_lane_count(dp->dpcd), + dp->num_lanes); + + return connector_status_connected; + } + +disconnected: + dp->status = connector_status_disconnected; + return connector_status_disconnected; +} + +static int zynqmp_dp_connector_get_modes(struct drm_connector *connector) +{ + struct zynqmp_dp *dp = connector_to_dp(connector); + struct edid *edid; + int ret; + + edid = drm_get_edid(connector, &dp->aux.ddc); + if (!edid) + return 0; + + drm_connector_update_edid_property(connector, edid); + ret = drm_add_edid_modes(connector, edid); + kfree(edid); + + return ret; +} + +static struct drm_encoder * +zynqmp_dp_connector_best_encoder(struct drm_connector *connector) +{ + struct zynqmp_dp *dp = connector_to_dp(connector); + + return &dp->encoder; +} + +static int zynqmp_dp_connector_mode_valid(struct drm_connector *connector, + struct drm_display_mode *mode) +{ + struct zynqmp_dp *dp = connector_to_dp(connector); + u8 max_lanes = dp->link_config.max_lanes; + u8 bpp = dp->config.bpp; + int max_rate = dp->link_config.max_rate; + int rate; + + if (mode->clock > ZYNQMP_MAX_FREQ) { + dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n", + mode->name); + drm_mode_debug_printmodeline(mode); + return MODE_CLOCK_HIGH; + } + + /* Check with link rate and lane count */ + rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp); + if (mode->clock > rate) { + dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n", + mode->name); + drm_mode_debug_printmodeline(mode); + return MODE_CLOCK_HIGH; + } + + return MODE_OK; +} + +static void zynqmp_dp_connector_destroy(struct drm_connector *connector) +{ + drm_connector_unregister(connector); + drm_connector_cleanup(connector); +} + +static int +zynqmp_dp_connector_atomic_set_property(struct drm_connector *connector, + struct drm_connector_state *state, + struct drm_property *property, + uint64_t val) +{ + struct zynqmp_dp *dp = connector_to_dp(connector); + int ret; + + if (property == dp->sync_prop) { + zynqmp_dp_set_sync_mode(dp, val); + } else if (property == dp->bpc_prop) { + u8 bpc; + + bpc = zynqmp_dp_set_bpc(dp, val); + if (bpc) { + drm_object_property_set_value(&connector->base, + property, bpc); + ret = -EINVAL; + } + } else { + return -EINVAL; + } + + return 0; +} + +static int +zynqmp_dp_connector_atomic_get_property(struct drm_connector *connector, + const struct drm_connector_state *state, + struct drm_property *property, + uint64_t *val) +{ + struct zynqmp_dp *dp = connector_to_dp(connector); + + if (property == dp->sync_prop) + *val = zynqmp_dp_get_sync_mode(dp); + else if (property == dp->bpc_prop) + *val = zynqmp_dp_get_bpc(dp); + else + return -EINVAL; + + return 0; +} + +static const struct drm_connector_funcs zynqmp_dp_connector_funcs = { + .detect = zynqmp_dp_connector_detect, + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = zynqmp_dp_connector_destroy, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, + .reset = drm_atomic_helper_connector_reset, + .atomic_set_property = zynqmp_dp_connector_atomic_set_property, + .atomic_get_property = zynqmp_dp_connector_atomic_get_property, +}; + +static struct drm_connector_helper_funcs zynqmp_dp_connector_helper_funcs = { + .get_modes = zynqmp_dp_connector_get_modes, + .best_encoder = zynqmp_dp_connector_best_encoder, + .mode_valid = zynqmp_dp_connector_mode_valid, +}; + +/* + * DRM encoder functions + */ + +static void zynqmp_dp_encoder_enable(struct drm_encoder *encoder) +{ + struct zynqmp_dp *dp = encoder_to_dp(encoder); + void __iomem *iomem = dp->iomem; + unsigned int i; + int ret = 0; + + pm_runtime_get_sync(dp->dev); + dp->enabled = true; + zynqmp_dp_init_aux(dp); + zynqmp_dp_update_misc(dp); + if (zynqmp_disp_aud_enabled(dp->dpsub->disp)) + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_CONTROL, 1); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0); + if (dp->status == connector_status_connected) { + for (i = 0; i < 3; i++) { + ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, + DP_SET_POWER_D0); + if (ret == 1) + break; + usleep_range(300, 500); + } + /* Some monitors take time to wake up properly */ + msleep(zynqmp_dp_power_on_delay_ms); + } + if (ret != 1) + dev_dbg(dp->dev, "DP aux failed\n"); + else + zynqmp_dp_train_loop(dp); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_SW_RESET, + ZYNQMP_DP_TX_SW_RESET_ALL); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_ENABLE_MAIN_STREAM, 1); +} + +static void zynqmp_dp_encoder_disable(struct drm_encoder *encoder) +{ + struct zynqmp_dp *dp = encoder_to_dp(encoder); + void __iomem *iomem = dp->iomem; + + dp->enabled = false; + cancel_delayed_work(&dp->hpd_work); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_ENABLE_MAIN_STREAM, 0); + drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3); + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_PHY_POWER_DOWN, + ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL); + if (zynqmp_disp_aud_enabled(dp->dpsub->disp)) + zynqmp_dp_write(iomem, ZYNQMP_DP_TX_AUDIO_CONTROL, 0); + pm_runtime_put_sync(dp->dev); +} + +static void +zynqmp_dp_encoder_atomic_mode_set(struct drm_encoder *encoder, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *connector_state) +{ + struct zynqmp_dp *dp = encoder_to_dp(encoder); + struct drm_display_mode *mode = &crtc_state->mode; + struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode; + u8 max_lanes = dp->link_config.max_lanes; + u8 bpp = dp->config.bpp; + int rate, max_rate = dp->link_config.max_rate; + int ret; + + /* Check again as bpp or format might have been chagned */ + rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp); + if (mode->clock > rate) { + dev_err(dp->dev, "the mode, %s,has too high pixel rate\n", + mode->name); + drm_mode_debug_printmodeline(mode); + } + + ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0); + if (ret < 0) + return; + + zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode); +} + +#define ZYNQMP_DP_MIN_H_BACKPORCH 20 + +static int +zynqmp_dp_encoder_atomic_check(struct drm_encoder *encoder, + struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state) +{ + struct drm_display_mode *mode = &crtc_state->mode; + struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode; + int diff = mode->htotal - mode->hsync_end; + + /* + * ZynqMP DP requires horizontal backporch to be greater than 12. + * This limitation may not be compatible with the sink device. + */ + if (diff < ZYNQMP_DP_MIN_H_BACKPORCH) { + int vrefresh = (adjusted_mode->clock * 1000) / + (adjusted_mode->vtotal * adjusted_mode->htotal); + + dev_dbg(encoder->dev->dev, "hbackporch adjusted: %d to %d", + diff, ZYNQMP_DP_MIN_H_BACKPORCH - diff); + diff = ZYNQMP_DP_MIN_H_BACKPORCH - diff; + adjusted_mode->htotal += diff; + adjusted_mode->clock = adjusted_mode->vtotal * + adjusted_mode->htotal * vrefresh / 1000; + } + + return 0; +} + +static const struct drm_encoder_funcs zynqmp_dp_encoder_funcs = { + .destroy = drm_encoder_cleanup, +}; + +static const struct drm_encoder_helper_funcs zynqmp_dp_encoder_helper_funcs = { + .enable = zynqmp_dp_encoder_enable, + .disable = zynqmp_dp_encoder_disable, + .atomic_mode_set = zynqmp_dp_encoder_atomic_mode_set, + .atomic_check = zynqmp_dp_encoder_atomic_check, +}; + +/* + * Component functions + */ + +static void zynqmp_dp_hpd_work_func(struct work_struct *work) +{ + struct zynqmp_dp *dp; + + dp = container_of(work, struct zynqmp_dp, hpd_work.work); + + if (dp->drm) + drm_helper_hpd_irq_event(dp->drm); +} + +static struct drm_prop_enum_list zynqmp_dp_bpc_enum[] = { + { 6, "6BPC" }, + { 8, "8BPC" }, + { 10, "10BPC" }, + { 12, "12BPC" }, +}; + +int zynqmp_dp_bind(struct device *dev, struct device *master, void *data) +{ + struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); + struct zynqmp_dp *dp = dpsub->dp; + struct drm_encoder *encoder = &dp->encoder; + struct drm_connector *connector = &dp->connector; + struct drm_device *drm = data; + struct device_node *port; + int ret; + + if (!dp->num_lanes) + return 0; + + encoder->possible_crtcs |= zynqmp_disp_get_crtc_mask(dpsub->disp); + for_each_child_of_node(dev->of_node, port) { + if (!port->name || of_node_cmp(port->name, "port")) + continue; + encoder->possible_crtcs |= drm_of_find_possible_crtcs(drm, + port); + } + drm_encoder_init(drm, encoder, &zynqmp_dp_encoder_funcs, + DRM_MODE_ENCODER_TMDS, NULL); + drm_encoder_helper_add(encoder, &zynqmp_dp_encoder_helper_funcs); + + connector->polled = DRM_CONNECTOR_POLL_HPD; + ret = drm_connector_init(encoder->dev, connector, + &zynqmp_dp_connector_funcs, + DRM_MODE_CONNECTOR_DisplayPort); + if (ret) { + dev_err(dp->dev, "failed to initialize the drm connector"); + goto error_encoder; + } + + drm_connector_helper_add(connector, &zynqmp_dp_connector_helper_funcs); + drm_connector_register(connector); + drm_connector_attach_encoder(connector, encoder); + connector->dpms = DRM_MODE_DPMS_OFF; + + dp->drm = drm; + dp->sync_prop = drm_property_create_bool(drm, 0, "sync"); + dp->bpc_prop = drm_property_create_enum(drm, 0, "bpc", + zynqmp_dp_bpc_enum, + ARRAY_SIZE(zynqmp_dp_bpc_enum)); + + dp->config.misc0 &= ~ZYNQMP_DP_TX_MAIN_STREAM_MISC0_SYNC; + drm_object_attach_property(&connector->base, dp->sync_prop, false); + ret = zynqmp_dp_set_bpc(dp, 8); + drm_object_attach_property(&connector->base, dp->bpc_prop, + ret ? ret : 8); + zynqmp_dp_update_bpp(dp); + + INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func); + + /* This enables interrupts, so should be called after DRM init */ + ret = zynqmp_dp_init_aux(dp); + if (ret) { + dev_err(dp->dev, "failed to initialize DP aux"); + goto error_prop; + } + + return 0; + +error_prop: + drm_property_destroy(dp->drm, dp->bpc_prop); + drm_property_destroy(dp->drm, dp->sync_prop); + zynqmp_dp_connector_destroy(&dp->connector); +error_encoder: + drm_encoder_cleanup(&dp->encoder); + return ret; +} + +void zynqmp_dp_unbind(struct device *dev, struct device *master, void *data) +{ + struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); + struct zynqmp_dp *dp = dpsub->dp; + + disable_irq(dp->irq); + if (!dp->num_lanes) + return; + + cancel_delayed_work_sync(&dp->hpd_work); + zynqmp_dp_exit_aux(dp); + drm_property_destroy(dp->drm, dp->bpc_prop); + drm_property_destroy(dp->drm, dp->sync_prop); + zynqmp_dp_connector_destroy(&dp->connector); + drm_encoder_cleanup(&dp->encoder); +} + +/* + * Platform functions + */ + +static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data) +{ + struct zynqmp_dp *dp = (struct zynqmp_dp *)data; + u32 status, mask; + + status = zynqmp_dp_read(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_STATUS); + mask = zynqmp_dp_read(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_MASK); + if (!(status & ~mask)) + return IRQ_NONE; + + /* dbg for diagnostic, but not much that the driver can do */ + if (status & ZYNQMP_DP_TX_INTR_CHBUF_UNDERFLW_MASK) + dev_dbg_ratelimited(dp->dev, "underflow interrupt\n"); + if (status & ZYNQMP_DP_TX_INTR_CHBUF_OVERFLW_MASK) + dev_dbg_ratelimited(dp->dev, "overflow interrupt\n"); + + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_SUB_TX_INTR_STATUS, status); + + /* The DP vblank will not be enabled with remote crtc device */ + if (status & ZYNQMP_DP_TX_INTR_VBLANK_START) + zynqmp_disp_handle_vblank(dp->dpsub->disp); + + if (status & ZYNQMP_DP_TX_INTR_HPD_EVENT) + schedule_delayed_work(&dp->hpd_work, 0); + + if (status & ZYNQMP_DP_TX_INTR_HPD_IRQ) { + int ret; + u8 status[DP_LINK_STATUS_SIZE + 2]; + + ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status, + DP_LINK_STATUS_SIZE + 2); + if (ret < 0) + goto handled; + + if (status[4] & DP_LINK_STATUS_UPDATED || + !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) || + !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) { + zynqmp_dp_train_loop(dp); + } + } + +handled: + return IRQ_HANDLED; +} + +int zynqmp_dp_probe(struct platform_device *pdev) +{ + struct zynqmp_dpsub *dpsub; + struct zynqmp_dp *dp; + struct resource *res; + unsigned int i; + int irq, ret; + + dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL); + if (!dp) + return -ENOMEM; + + dp->dpms = DRM_MODE_DPMS_OFF; + dp->status = connector_status_disconnected; + dp->dev = &pdev->dev; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp"); + dp->iomem = devm_ioremap_resource(dp->dev, res); + if (IS_ERR(dp->iomem)) + return PTR_ERR(dp->iomem); + + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_PHY_POWER_DOWN, + ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL); + zynqmp_dp_set(dp->iomem, ZYNQMP_DP_TX_PHY_CONFIG, + ZYNQMP_DP_TX_PHY_CONFIG_ALL_RESET); + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_FORCE_SCRAMBLER_RESET, 1); + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_ENABLE, 0); + + dp->num_lanes = 2; + for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) { + char phy_name[16]; + + snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i); + dp->phy[i] = devm_phy_get(dp->dev, phy_name); + if (IS_ERR(dp->phy[i])) { + ret = PTR_ERR(dp->phy[i]); + dp->phy[i] = NULL; + + /* 2nd lane is optional */ + if (i == 1 && ret == -ENODEV) { + dp->num_lanes = 1; + break; + } + + /* + * If no phy lane is assigned, the DP Tx gets disabled. + * The display part of the DP subsystem can still be + * used to drive the output to FPGA, thus let the DP + * subsystem driver to proceed without this DP Tx. + */ + if (i == 0 && ret == -ENODEV) { + dp->num_lanes = 0; + goto out; + } + + if (ret != -EPROBE_DEFER) + dev_err(dp->dev, "failed to get phy lane\n"); + + return ret; + } + } + + ret = zynqmp_dp_init_phy(dp); + if (ret) + goto error_phy; + + dp->aux.name = "ZynqMP DP AUX"; + dp->aux.dev = dp->dev; + dp->aux.transfer = zynqmp_dp_aux_transfer; + ret = drm_dp_aux_register(&dp->aux); + if (ret < 0) { + dev_err(dp->dev, "failed to initialize DP aux\n"); + goto error; + } + +out: + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + ret = irq; + goto error; + } + + ret = devm_request_threaded_irq(dp->dev, irq, NULL, + zynqmp_dp_irq_handler, IRQF_ONESHOT, + dev_name(dp->dev), dp); + if (ret < 0) + goto error; + dp->irq = irq; + + dpsub = platform_get_drvdata(pdev); + dpsub->dp = dp; + dp->dpsub = dpsub; + + dev_dbg(dp->dev, + "ZynqMP DisplayPort Tx driver probed with %u phy lanes\n", + dp->num_lanes); + + return 0; + +error: + drm_dp_aux_unregister(&dp->aux); +error_phy: + zynqmp_dp_exit_phy(dp); + return ret; +} + +int zynqmp_dp_remove(struct platform_device *pdev) +{ + struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); + struct zynqmp_dp *dp = dpsub->dp; + + zynqmp_dp_write(dp->iomem, ZYNQMP_DP_TX_ENABLE, 0); + drm_dp_aux_unregister(&dp->aux); + zynqmp_dp_exit_phy(dp); + dpsub->dp = NULL; + + return 0; +} |