On 1/29/2024 11:25 PM, Imre Deak wrote:
Add a workaround to fix BS (blank start) to BS jitter issues on MST
links when FEC is enabled. Neither Bspec requires this nor Windows
clears the WA when disabling the output - presumedly because
CHICKEN_MISC_3 gets reset after disabling the pipe/transcoder - so
follow suit.
Bspec: 50050, 55424
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_mst.c | 24 +++++++++++++++++++++
drivers/gpu/drm/i915/i915_reg.h | 3 +++
2 files changed, 27 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index 5fa25a5a36b55..22c1759f912db 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -1106,6 +1106,28 @@ static void intel_mst_pre_enable_dp(struct intel_atomic_state *state,
intel_ddi_set_dp_msa(pipe_config, conn_state);
}
+static void enable_bs_jitter_was(const struct intel_crtc_state *crtc_state)
+{
+ struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
+ u32 clear = 0;
+ u32 set = 0;
+
+ if (!IS_ALDERLAKE_P(i915))
+ return;
+
+ if (!IS_DISPLAY_STEP(i915, STEP_D0, STEP_FOREVER))
+ return;
+
+ /* Wa_14013163432:adlp */
+ if (crtc_state->fec_enable || intel_dp_is_uhbr(crtc_state))
Is this for DP MST + UHBR and DP MST + FEC?
From Bspec it seems this is meant only for MST+ FEC case, unless I am
missing something.
+ set |= DP_MST_FEC_BS_JITTER_WA(crtc_state->cpu_transcoder);
+
+ if (!clear && !set)
+ return;
+
+ intel_de_rmw(i915, CHICKEN_MISC_3, clear, set);
+}
+
static void intel_mst_enable_dp(struct intel_atomic_state *state,
struct intel_encoder *encoder,
const struct intel_crtc_state *pipe_config,
@@ -1134,6 +1156,8 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz & 0xffffff));
}
+ enable_bs_jitter_was(pipe_config);
+
intel_ddi_enable_transcoder_func(encoder, pipe_config);
clear_act_sent(encoder, pipe_config);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 75bc08081fce9..67b7d02ea37bf 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4555,6 +4555,9 @@
#define GLK_CL1_PWR_DOWN REG_BIT(11)
#define GLK_CL0_PWR_DOWN REG_BIT(10)
+#define CHICKEN_MISC_3 _MMIO(0x42088)
+#define DP_MST_FEC_BS_JITTER_WA(trans) REG_BIT(0 + (trans) - TRANSCODER_A)
Should we mention /* adlp */ here?
Regards,
Ankit
+
#define CHICKEN_MISC_4 _MMIO(0x4208c)
#define CHICKEN_FBC_STRIDE_OVERRIDE REG_BIT(13)
#define CHICKEN_FBC_STRIDE_MASK REG_GENMASK(12, 0)
