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path: root/drivers/gpu/drm/nouveau/nv04_dac.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nv04_dac.c')
-rw-r--r--drivers/gpu/drm/nouveau/nv04_dac.c524
1 files changed, 524 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nv04_dac.c b/drivers/gpu/drm/nouveau/nv04_dac.c
new file mode 100644
index 000000000000..d9f32879ba38
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nv04_dac.c
@@ -0,0 +1,524 @@
+/*
+ * Copyright 2003 NVIDIA, Corporation
+ * Copyright 2006 Dave Airlie
+ * Copyright 2007 Maarten Maathuis
+ * Copyright 2007-2009 Stuart Bennett
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "drmP.h"
+#include "drm_crtc_helper.h"
+
+#include "nouveau_drv.h"
+#include "nouveau_encoder.h"
+#include "nouveau_connector.h"
+#include "nouveau_crtc.h"
+#include "nouveau_hw.h"
+#include "nvreg.h"
+
+int nv04_dac_output_offset(struct drm_encoder *encoder)
+{
+ struct dcb_entry *dcb = nouveau_encoder(encoder)->dcb;
+ int offset = 0;
+
+ if (dcb->or & (8 | OUTPUT_C))
+ offset += 0x68;
+ if (dcb->or & (8 | OUTPUT_B))
+ offset += 0x2000;
+
+ return offset;
+}
+
+/*
+ * arbitrary limit to number of sense oscillations tolerated in one sample
+ * period (observed to be at least 13 in "nvidia")
+ */
+#define MAX_HBLANK_OSC 20
+
+/*
+ * arbitrary limit to number of conflicting sample pairs to tolerate at a
+ * voltage step (observed to be at least 5 in "nvidia")
+ */
+#define MAX_SAMPLE_PAIRS 10
+
+static int sample_load_twice(struct drm_device *dev, bool sense[2])
+{
+ int i;
+
+ for (i = 0; i < 2; i++) {
+ bool sense_a, sense_b, sense_b_prime;
+ int j = 0;
+
+ /*
+ * wait for bit 0 clear -- out of hblank -- (say reg value 0x4),
+ * then wait for transition 0x4->0x5->0x4: enter hblank, leave
+ * hblank again
+ * use a 10ms timeout (guards against crtc being inactive, in
+ * which case blank state would never change)
+ */
+ if (!nouveau_wait_until(dev, 10000000, NV_PRMCIO_INP0__COLOR,
+ 0x00000001, 0x00000000))
+ return -EBUSY;
+ if (!nouveau_wait_until(dev, 10000000, NV_PRMCIO_INP0__COLOR,
+ 0x00000001, 0x00000001))
+ return -EBUSY;
+ if (!nouveau_wait_until(dev, 10000000, NV_PRMCIO_INP0__COLOR,
+ 0x00000001, 0x00000000))
+ return -EBUSY;
+
+ udelay(100);
+ /* when level triggers, sense is _LO_ */
+ sense_a = nv_rd08(dev, NV_PRMCIO_INP0) & 0x10;
+
+ /* take another reading until it agrees with sense_a... */
+ do {
+ udelay(100);
+ sense_b = nv_rd08(dev, NV_PRMCIO_INP0) & 0x10;
+ if (sense_a != sense_b) {
+ sense_b_prime =
+ nv_rd08(dev, NV_PRMCIO_INP0) & 0x10;
+ if (sense_b == sense_b_prime) {
+ /* ... unless two consecutive subsequent
+ * samples agree; sense_a is replaced */
+ sense_a = sense_b;
+ /* force mis-match so we loop */
+ sense_b = !sense_a;
+ }
+ }
+ } while ((sense_a != sense_b) && ++j < MAX_HBLANK_OSC);
+
+ if (j == MAX_HBLANK_OSC)
+ /* with so much oscillation, default to sense:LO */
+ sense[i] = false;
+ else
+ sense[i] = sense_a;
+ }
+
+ return 0;
+}
+
+static enum drm_connector_status nv04_dac_detect(struct drm_encoder *encoder,
+ struct drm_connector *connector)
+{
+ struct drm_device *dev = encoder->dev;
+ uint8_t saved_seq1, saved_pi, saved_rpc1;
+ uint8_t saved_palette0[3], saved_palette_mask;
+ uint32_t saved_rtest_ctrl, saved_rgen_ctrl;
+ int i;
+ uint8_t blue;
+ bool sense = true;
+
+ /*
+ * for this detection to work, there needs to be a mode set up on the
+ * CRTC. this is presumed to be the case
+ */
+
+ if (nv_two_heads(dev))
+ /* only implemented for head A for now */
+ NVSetOwner(dev, 0);
+
+ saved_seq1 = NVReadVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX);
+ NVWriteVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX, saved_seq1 & ~0x20);
+
+ saved_rtest_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL);
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL,
+ saved_rtest_ctrl & ~NV_PRAMDAC_TEST_CONTROL_PWRDWN_DAC_OFF);
+
+ msleep(10);
+
+ saved_pi = NVReadVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX);
+ NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX,
+ saved_pi & ~(0x80 | MASK(NV_CIO_CRE_PIXEL_FORMAT)));
+ saved_rpc1 = NVReadVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX);
+ NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX, saved_rpc1 & ~0xc0);
+
+ nv_wr08(dev, NV_PRMDIO_READ_MODE_ADDRESS, 0x0);
+ for (i = 0; i < 3; i++)
+ saved_palette0[i] = nv_rd08(dev, NV_PRMDIO_PALETTE_DATA);
+ saved_palette_mask = nv_rd08(dev, NV_PRMDIO_PIXEL_MASK);
+ nv_wr08(dev, NV_PRMDIO_PIXEL_MASK, 0);
+
+ saved_rgen_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL);
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL,
+ (saved_rgen_ctrl & ~(NV_PRAMDAC_GENERAL_CONTROL_BPC_8BITS |
+ NV_PRAMDAC_GENERAL_CONTROL_TERMINATION_75OHM)) |
+ NV_PRAMDAC_GENERAL_CONTROL_PIXMIX_ON);
+
+ blue = 8; /* start of test range */
+
+ do {
+ bool sense_pair[2];
+
+ nv_wr08(dev, NV_PRMDIO_WRITE_MODE_ADDRESS, 0);
+ nv_wr08(dev, NV_PRMDIO_PALETTE_DATA, 0);
+ nv_wr08(dev, NV_PRMDIO_PALETTE_DATA, 0);
+ /* testing blue won't find monochrome monitors. I don't care */
+ nv_wr08(dev, NV_PRMDIO_PALETTE_DATA, blue);
+
+ i = 0;
+ /* take sample pairs until both samples in the pair agree */
+ do {
+ if (sample_load_twice(dev, sense_pair))
+ goto out;
+ } while ((sense_pair[0] != sense_pair[1]) &&
+ ++i < MAX_SAMPLE_PAIRS);
+
+ if (i == MAX_SAMPLE_PAIRS)
+ /* too much oscillation defaults to LO */
+ sense = false;
+ else
+ sense = sense_pair[0];
+
+ /*
+ * if sense goes LO before blue ramps to 0x18, monitor is not connected.
+ * ergo, if blue gets to 0x18, monitor must be connected
+ */
+ } while (++blue < 0x18 && sense);
+
+out:
+ nv_wr08(dev, NV_PRMDIO_PIXEL_MASK, saved_palette_mask);
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_GENERAL_CONTROL, saved_rgen_ctrl);
+ nv_wr08(dev, NV_PRMDIO_WRITE_MODE_ADDRESS, 0);
+ for (i = 0; i < 3; i++)
+ nv_wr08(dev, NV_PRMDIO_PALETTE_DATA, saved_palette0[i]);
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL, saved_rtest_ctrl);
+ NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_PIXEL_INDEX, saved_pi);
+ NVWriteVgaCrtc(dev, 0, NV_CIO_CRE_RPC1_INDEX, saved_rpc1);
+ NVWriteVgaSeq(dev, 0, NV_VIO_SR_CLOCK_INDEX, saved_seq1);
+
+ if (blue == 0x18) {
+ NV_INFO(dev, "Load detected on head A\n");
+ return connector_status_connected;
+ }
+
+ return connector_status_disconnected;
+}
+
+enum drm_connector_status nv17_dac_detect(struct drm_encoder *encoder,
+ struct drm_connector *connector)
+{
+ struct drm_device *dev = encoder->dev;
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct dcb_entry *dcb = nouveau_encoder(encoder)->dcb;
+ uint32_t testval, regoffset = nv04_dac_output_offset(encoder);
+ uint32_t saved_powerctrl_2 = 0, saved_powerctrl_4 = 0, saved_routput,
+ saved_rtest_ctrl, saved_gpio0, saved_gpio1, temp, routput;
+ int head, present = 0;
+
+#define RGB_TEST_DATA(r, g, b) (r << 0 | g << 10 | b << 20)
+ if (dcb->type == OUTPUT_TV) {
+ testval = RGB_TEST_DATA(0xa0, 0xa0, 0xa0);
+
+ if (dev_priv->vbios->tvdactestval)
+ testval = dev_priv->vbios->tvdactestval;
+ } else {
+ testval = RGB_TEST_DATA(0x140, 0x140, 0x140); /* 0x94050140 */
+
+ if (dev_priv->vbios->dactestval)
+ testval = dev_priv->vbios->dactestval;
+ }
+
+ saved_rtest_ctrl = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset);
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset,
+ saved_rtest_ctrl & ~NV_PRAMDAC_TEST_CONTROL_PWRDWN_DAC_OFF);
+
+ saved_powerctrl_2 = nvReadMC(dev, NV_PBUS_POWERCTRL_2);
+
+ nvWriteMC(dev, NV_PBUS_POWERCTRL_2, saved_powerctrl_2 & 0xd7ffffff);
+ if (regoffset == 0x68) {
+ saved_powerctrl_4 = nvReadMC(dev, NV_PBUS_POWERCTRL_4);
+ nvWriteMC(dev, NV_PBUS_POWERCTRL_4, saved_powerctrl_4 & 0xffffffcf);
+ }
+
+ saved_gpio1 = nv17_gpio_get(dev, DCB_GPIO_TVDAC1);
+ saved_gpio0 = nv17_gpio_get(dev, DCB_GPIO_TVDAC0);
+
+ nv17_gpio_set(dev, DCB_GPIO_TVDAC1, dcb->type == OUTPUT_TV);
+ nv17_gpio_set(dev, DCB_GPIO_TVDAC0, dcb->type == OUTPUT_TV);
+
+ msleep(4);
+
+ saved_routput = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset);
+ head = (saved_routput & 0x100) >> 8;
+#if 0
+ /* if there's a spare crtc, using it will minimise flicker for the case
+ * where the in-use crtc is in use by an off-chip tmds encoder */
+ if (xf86_config->crtc[head]->enabled && !xf86_config->crtc[head ^ 1]->enabled)
+ head ^= 1;
+#endif
+ /* nv driver and nv31 use 0xfffffeee, nv34 and 6600 use 0xfffffece */
+ routput = (saved_routput & 0xfffffece) | head << 8;
+
+ if (dev_priv->card_type >= NV_40) {
+ if (dcb->type == OUTPUT_TV)
+ routput |= 0x1a << 16;
+ else
+ routput &= ~(0x1a << 16);
+ }
+
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, routput);
+ msleep(1);
+
+ temp = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset);
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, temp | 1);
+
+ NVWriteRAMDAC(dev, head, NV_PRAMDAC_TESTPOINT_DATA,
+ NV_PRAMDAC_TESTPOINT_DATA_NOTBLANK | testval);
+ temp = NVReadRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL);
+ NVWriteRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL,
+ temp | NV_PRAMDAC_TEST_CONTROL_TP_INS_EN_ASSERTED);
+ msleep(5);
+
+ temp = NVReadRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset);
+
+ if (dcb->type == OUTPUT_TV)
+ present = (nv17_tv_detect(encoder, connector, temp)
+ == connector_status_connected);
+ else
+ present = temp & NV_PRAMDAC_TEST_CONTROL_SENSEB_ALLHI;
+
+ temp = NVReadRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL);
+ NVWriteRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL,
+ temp & ~NV_PRAMDAC_TEST_CONTROL_TP_INS_EN_ASSERTED);
+ NVWriteRAMDAC(dev, head, NV_PRAMDAC_TESTPOINT_DATA, 0);
+
+ /* bios does something more complex for restoring, but I think this is good enough */
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + regoffset, saved_routput);
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + regoffset, saved_rtest_ctrl);
+ if (regoffset == 0x68)
+ nvWriteMC(dev, NV_PBUS_POWERCTRL_4, saved_powerctrl_4);
+ nvWriteMC(dev, NV_PBUS_POWERCTRL_2, saved_powerctrl_2);
+
+ nv17_gpio_set(dev, DCB_GPIO_TVDAC1, saved_gpio1);
+ nv17_gpio_set(dev, DCB_GPIO_TVDAC0, saved_gpio0);
+
+ if (present) {
+ NV_INFO(dev, "Load detected on output %c\n", '@' + ffs(dcb->or));
+ return connector_status_connected;
+ }
+
+ return connector_status_disconnected;
+}
+
+
+static bool nv04_dac_mode_fixup(struct drm_encoder *encoder,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ return true;
+}
+
+static void nv04_dac_prepare(struct drm_encoder *encoder)
+{
+ struct drm_encoder_helper_funcs *helper = encoder->helper_private;
+ struct drm_device *dev = encoder->dev;
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ int head = nouveau_crtc(encoder->crtc)->index;
+ struct nv04_crtc_reg *crtcstate = dev_priv->mode_reg.crtc_reg;
+
+ helper->dpms(encoder, DRM_MODE_DPMS_OFF);
+
+ nv04_dfp_disable(dev, head);
+
+ /* Some NV4x have unknown values (0x3f, 0x50, 0x54, 0x6b, 0x79, 0x7f)
+ * at LCD__INDEX which we don't alter
+ */
+ if (!(crtcstate[head].CRTC[NV_CIO_CRE_LCD__INDEX] & 0x44))
+ crtcstate[head].CRTC[NV_CIO_CRE_LCD__INDEX] = 0;
+}
+
+
+static void nv04_dac_mode_set(struct drm_encoder *encoder,
+ struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
+{
+ struct drm_device *dev = encoder->dev;
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ int head = nouveau_crtc(encoder->crtc)->index;
+
+ if (nv_gf4_disp_arch(dev)) {
+ struct drm_encoder *rebind;
+ uint32_t dac_offset = nv04_dac_output_offset(encoder);
+ uint32_t otherdac;
+
+ /* bit 16-19 are bits that are set on some G70 cards,
+ * but don't seem to have much effect */
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset,
+ head << 8 | NV_PRAMDAC_DACCLK_SEL_DACCLK);
+ /* force any other vga encoders to bind to the other crtc */
+ list_for_each_entry(rebind, &dev->mode_config.encoder_list, head) {
+ if (rebind == encoder
+ || nouveau_encoder(rebind)->dcb->type != OUTPUT_ANALOG)
+ continue;
+
+ dac_offset = nv04_dac_output_offset(rebind);
+ otherdac = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset);
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + dac_offset,
+ (otherdac & ~0x0100) | (head ^ 1) << 8);
+ }
+ }
+
+ /* This could use refinement for flatpanels, but it should work this way */
+ if (dev_priv->chipset < 0x44)
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0xf0000000);
+ else
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0x00100000);
+}
+
+static void nv04_dac_commit(struct drm_encoder *encoder)
+{
+ struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
+ struct drm_device *dev = encoder->dev;
+ struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
+ struct drm_encoder_helper_funcs *helper = encoder->helper_private;
+
+ helper->dpms(encoder, DRM_MODE_DPMS_ON);
+
+ NV_INFO(dev, "Output %s is running on CRTC %d using output %c\n",
+ drm_get_connector_name(&nouveau_encoder_connector_get(nv_encoder)->base),
+ nv_crtc->index, '@' + ffs(nv_encoder->dcb->or));
+}
+
+void nv04_dac_update_dacclk(struct drm_encoder *encoder, bool enable)
+{
+ struct drm_device *dev = encoder->dev;
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct dcb_entry *dcb = nouveau_encoder(encoder)->dcb;
+
+ if (nv_gf4_disp_arch(dev)) {
+ uint32_t *dac_users = &dev_priv->dac_users[ffs(dcb->or) - 1];
+ int dacclk_off = NV_PRAMDAC_DACCLK + nv04_dac_output_offset(encoder);
+ uint32_t dacclk = NVReadRAMDAC(dev, 0, dacclk_off);
+
+ if (enable) {
+ *dac_users |= 1 << dcb->index;
+ NVWriteRAMDAC(dev, 0, dacclk_off, dacclk | NV_PRAMDAC_DACCLK_SEL_DACCLK);
+
+ } else {
+ *dac_users &= ~(1 << dcb->index);
+ if (!*dac_users)
+ NVWriteRAMDAC(dev, 0, dacclk_off,
+ dacclk & ~NV_PRAMDAC_DACCLK_SEL_DACCLK);
+ }
+ }
+}
+
+static void nv04_dac_dpms(struct drm_encoder *encoder, int mode)
+{
+ struct drm_device *dev = encoder->dev;
+ struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
+
+ if (nv_encoder->last_dpms == mode)
+ return;
+ nv_encoder->last_dpms = mode;
+
+ NV_INFO(dev, "Setting dpms mode %d on vga encoder (output %d)\n",
+ mode, nv_encoder->dcb->index);
+
+ nv04_dac_update_dacclk(encoder, mode == DRM_MODE_DPMS_ON);
+}
+
+static void nv04_dac_save(struct drm_encoder *encoder)
+{
+ struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
+ struct drm_device *dev = encoder->dev;
+
+ if (nv_gf4_disp_arch(dev))
+ nv_encoder->restore.output = NVReadRAMDAC(dev, 0, NV_PRAMDAC_DACCLK +
+ nv04_dac_output_offset(encoder));
+}
+
+static void nv04_dac_restore(struct drm_encoder *encoder)
+{
+ struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
+ struct drm_device *dev = encoder->dev;
+
+ if (nv_gf4_disp_arch(dev))
+ NVWriteRAMDAC(dev, 0, NV_PRAMDAC_DACCLK + nv04_dac_output_offset(encoder),
+ nv_encoder->restore.output);
+
+ nv_encoder->last_dpms = NV_DPMS_CLEARED;
+}
+
+static void nv04_dac_destroy(struct drm_encoder *encoder)
+{
+ struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
+
+ NV_DEBUG_KMS(encoder->dev, "\n");
+
+ drm_encoder_cleanup(encoder);
+ kfree(nv_encoder);
+}
+
+static const struct drm_encoder_helper_funcs nv04_dac_helper_funcs = {
+ .dpms = nv04_dac_dpms,
+ .save = nv04_dac_save,
+ .restore = nv04_dac_restore,
+ .mode_fixup = nv04_dac_mode_fixup,
+ .prepare = nv04_dac_prepare,
+ .commit = nv04_dac_commit,
+ .mode_set = nv04_dac_mode_set,
+ .detect = nv04_dac_detect
+};
+
+static const struct drm_encoder_helper_funcs nv17_dac_helper_funcs = {
+ .dpms = nv04_dac_dpms,
+ .save = nv04_dac_save,
+ .restore = nv04_dac_restore,
+ .mode_fixup = nv04_dac_mode_fixup,
+ .prepare = nv04_dac_prepare,
+ .commit = nv04_dac_commit,
+ .mode_set = nv04_dac_mode_set,
+ .detect = nv17_dac_detect
+};
+
+static const struct drm_encoder_funcs nv04_dac_funcs = {
+ .destroy = nv04_dac_destroy,
+};
+
+int nv04_dac_create(struct drm_device *dev, struct dcb_entry *entry)
+{
+ const struct drm_encoder_helper_funcs *helper;
+ struct drm_encoder *encoder;
+ struct nouveau_encoder *nv_encoder = NULL;
+
+ nv_encoder = kzalloc(sizeof(*nv_encoder), GFP_KERNEL);
+ if (!nv_encoder)
+ return -ENOMEM;
+
+ encoder = to_drm_encoder(nv_encoder);
+
+ nv_encoder->dcb = entry;
+ nv_encoder->or = ffs(entry->or) - 1;
+
+ if (nv_gf4_disp_arch(dev))
+ helper = &nv17_dac_helper_funcs;
+ else
+ helper = &nv04_dac_helper_funcs;
+
+ drm_encoder_init(dev, encoder, &nv04_dac_funcs, DRM_MODE_ENCODER_DAC);
+ drm_encoder_helper_add(encoder, helper);
+
+ encoder->possible_crtcs = entry->heads;
+ encoder->possible_clones = 0;
+
+ return 0;
+}