A new step has been added to the DP modeset sequences for all platforms
with display version 12 and beyond: if enabling DP MST with FEC, we
need to set a chicken bit before enabling the transcoder. The chicken
bit should be disabled again before disabling the transcoder (which we
can do unconditionally since it shouldn't be set anyway in non-MST
cases).
Bspec: 49190, 54128, 55424
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_display.c | 4 ++++
drivers/gpu/drm/i915/display/intel_dp_mst.c | 14 +++++++-------
drivers/gpu/drm/i915/i915_reg.h | 19 ++++++++++---------
3 files changed, 21 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 2b082e1827a8..902826202622 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -1035,6 +1035,10 @@ void intel_disable_pipe(const struct intel_crtc_state *old_crtc_state)
if (!IS_I830(dev_priv))
val &= ~PIPECONF_ENABLE;
+ if (DISPLAY_VER(dev_priv) >= 12)
+ intel_de_rmw(dev_priv, CHICKEN_TRANS(cpu_transcoder),
+ FECSTALL_DIS_DPTSTREAM_DPTTG, 0);
+
intel_de_write(dev_priv, reg, val);
if ((val & PIPECONF_ENABLE) == 0)
intel_wait_for_pipe_off(old_crtc_state);
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 3661cd19ce48..e2eb46337369 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -542,7 +542,7 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
struct intel_digital_port *dig_port = intel_mst->primary;
struct intel_dp *intel_dp = &dig_port->dp;
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
- u32 val;
+ enum transcoder trans = pipe_config->cpu_transcoder;
drm_WARN_ON(&dev_priv->drm, pipe_config->has_pch_encoder);
@@ -550,12 +550,8 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
intel_ddi_enable_transcoder_func(encoder, pipe_config);
- val = intel_de_read(dev_priv,
- TRANS_DDI_FUNC_CTL(pipe_config->cpu_transcoder));
- val |= TRANS_DDI_DP_VC_PAYLOAD_ALLOC;
- intel_de_write(dev_priv,
- TRANS_DDI_FUNC_CTL(pipe_config->cpu_transcoder),
- val);
+ intel_de_rmw(dev_priv, TRANS_DDI_FUNC_CTL(trans), 0,
+ TRANS_DDI_DP_VC_PAYLOAD_ALLOC);
drm_dbg_kms(&dev_priv->drm, "active links %d\n",
intel_dp->active_mst_links);
@@ -564,6 +560,10 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
drm_dp_update_payload_part2(&intel_dp->mst_mgr);
+ if (DISPLAY_VER(dev_priv) >= 12 && pipe_config->fec_enable)
+ intel_de_rmw(dev_priv, CHICKEN_TRANS(trans), 0,
+ FECSTALL_DIS_DPTSTREAM_DPTTG);
+
intel_enable_pipe(pipe_config);
intel_crtc_vblank_on(pipe_config);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8e1392028184..9f1f5e1228f8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8173,15 +8173,16 @@ enum {
[TRANSCODER_B] = _CHICKEN_TRANS_B, \
[TRANSCODER_C] = _CHICKEN_TRANS_C, \
[TRANSCODER_D] = _CHICKEN_TRANS_D))
-#define HSW_FRAME_START_DELAY_MASK (3 << 27)
-#define HSW_FRAME_START_DELAY(x) ((x) << 27) /* 0-3 */
-#define VSC_DATA_SEL_SOFTWARE_CONTROL (1 << 25) /* GLK and CNL+ */
-#define DDI_TRAINING_OVERRIDE_ENABLE (1 << 19)
-#define DDI_TRAINING_OVERRIDE_VALUE (1 << 18)
-#define DDIE_TRAINING_OVERRIDE_ENABLE (1 << 17) /* CHICKEN_TRANS_A only */
-#define DDIE_TRAINING_OVERRIDE_VALUE (1 << 16) /* CHICKEN_TRANS_A only */
-#define PSR2_ADD_VERTICAL_LINE_COUNT (1 << 15)
-#define PSR2_VSC_ENABLE_PROG_HEADER (1 << 12)
+#define HSW_FRAME_START_DELAY_MASK REG_GENMASK(28, 27)
+#define HSW_FRAME_START_DELAY(x) REG_FIELD_PREP(HSW_FRAME_START_DELAY_MASK, x)
+#define VSC_DATA_SEL_SOFTWARE_CONTROL REG_BIT(25) /* GLK and CNL+ */
+#define FECSTALL_DIS_DPTSTREAM_DPTTG REG_BIT(23)
+#define DDI_TRAINING_OVERRIDE_ENABLE REG_BIT(19)
+#define DDI_TRAINING_OVERRIDE_VALUE REG_BIT(18)
+#define DDIE_TRAINING_OVERRIDE_ENABLE REG_BIT(17) /* CHICKEN_TRANS_A only */
+#define DDIE_TRAINING_OVERRIDE_VALUE REG_BIT(16) /* CHICKEN_TRANS_A only */
+#define PSR2_ADD_VERTICAL_LINE_COUNT REG_BIT(15)
+#define PSR2_VSC_ENABLE_PROG_HEADER REG_BIT(12)
#define DISP_ARB_CTL _MMIO(0x45000)
#define DISP_FBC_MEMORY_WAKE (1 << 31)
--
2.25.4
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