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From f3a3bea08889b60a3628b1ee1a4f95258bf26cb3 Mon Sep 17 00:00:00 2001
From: Charlene Liu <charlene.liu@amd.com>
Date: Fri, 22 Feb 2019 13:55:46 -0500
Subject: [PATCH 1594/2940] drm/amd/display: add HW i2c arbitration with dmcu
Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
---
drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c | 12 +++++++++++-
drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.h | 8 ++++++--
2 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c
index 40f2d6e0b122..cd26161bcc4d 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.c
@@ -346,6 +346,16 @@ static void release_engine(
}
+static bool is_engine_available(struct dce_i2c_hw *dce_i2c_hw)
+{
+ unsigned int arbitrate;
+
+ REG_GET(DC_I2C_ARBITRATION, DC_I2C_REG_RW_CNTL_STATUS, &arbitrate);
+ if (arbitrate == DC_I2C_REG_RW_CNTL_STATUS_DMCU_ONLY)
+ return false;
+ return true;
+}
+
struct dce_i2c_hw *acquire_i2c_hw_engine(
struct resource_pool *pool,
struct ddc *ddc)
@@ -368,7 +378,7 @@ struct dce_i2c_hw *acquire_i2c_hw_engine(
if (!dce_i2c_hw)
return NULL;
- if (pool->i2c_hw_buffer_in_use)
+ if (pool->i2c_hw_buffer_in_use || !is_engine_available(dce_i2c_hw))
return NULL;
do {
diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.h b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.h
index 7f19bb439665..575500755b2e 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.h
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_i2c_hw.h
@@ -29,7 +29,8 @@
enum dc_i2c_status {
DC_I2C_STATUS__DC_I2C_STATUS_IDLE,
DC_I2C_STATUS__DC_I2C_STATUS_USED_BY_SW,
- DC_I2C_STATUS__DC_I2C_STATUS_USED_BY_HW
+ DC_I2C_STATUS__DC_I2C_STATUS_USED_BY_HW,
+ DC_I2C_REG_RW_CNTL_STATUS_DMCU_ONLY = 2,
};
enum dc_i2c_arbitration {
@@ -129,7 +130,8 @@ enum {
I2C_SF(DC_I2C_DATA, DC_I2C_DATA, mask_sh),\
I2C_SF(DC_I2C_DATA, DC_I2C_INDEX, mask_sh),\
I2C_SF(DC_I2C_DATA, DC_I2C_INDEX_WRITE, mask_sh),\
- I2C_SF(MICROSECOND_TIME_BASE_DIV, XTAL_REF_DIV, mask_sh)
+ I2C_SF(MICROSECOND_TIME_BASE_DIV, XTAL_REF_DIV, mask_sh),\
+ I2C_SF(DC_I2C_ARBITRATION, DC_I2C_REG_RW_CNTL_STATUS, mask_sh)
#define I2C_COMMON_MASK_SH_LIST_DCE110(mask_sh)\
I2C_COMMON_MASK_SH_LIST_DCE_COMMON_BASE(mask_sh),\
@@ -170,6 +172,7 @@ struct dce_i2c_shift {
uint8_t DC_I2C_INDEX;
uint8_t DC_I2C_INDEX_WRITE;
uint8_t XTAL_REF_DIV;
+ uint8_t DC_I2C_REG_RW_CNTL_STATUS;
};
struct dce_i2c_mask {
@@ -207,6 +210,7 @@ struct dce_i2c_mask {
uint32_t DC_I2C_INDEX;
uint32_t DC_I2C_INDEX_WRITE;
uint32_t XTAL_REF_DIV;
+ uint32_t DC_I2C_REG_RW_CNTL_STATUS;
};
struct dce_i2c_registers {
--
2.17.1
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