Sink can be configured to calculate the CRC over the static frame and
compare with the CRC calculated and transmited in the VSC SDP by
source, if there is a mismatch sink will do a short pulse in HPD
and set DP_PSR_LINK_CRC_ERROR in DP_PSR_ERROR_STATUS.
Spec: 7723
v6:
andling DP_PSR_LINK_CRC_ERROR here and remove "bdw+" from commit
message
v4:
patch moved to after 'drm/i915/psr: Avoid PSR exit max time timeout'
to avoid touch in 2 patches EDP_PSR_DEBUG.
v3:
disabling PSR instead of exiting on error
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_psr.c | 10 +++++++++-
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index caad19f5f557..43db91c19f52 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4044,6 +4044,7 @@ enum {
#define EDP_PSR_SKIP_AUX_EXIT (1 << 12)
#define EDP_PSR_TP1_TP2_SEL (0 << 11)
#define EDP_PSR_TP1_TP3_SEL (1 << 11)
+#define EDP_PSR_CRC_ENABLE (1 << 10) /* BDW+ */
#define EDP_PSR_TP2_TP3_TIME_500us (0 << 8)
#define EDP_PSR_TP2_TP3_TIME_100us (1 << 8)
#define EDP_PSR_TP2_TP3_TIME_2500us (2 << 8)
diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
index 11d728770196..bdb644268edb 100644
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -360,6 +360,8 @@ static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
if (dev_priv->psr.link_standby)
dpcd_val |= DP_PSR_MAIN_LINK_ACTIVE;
+ if (!dev_priv->psr.psr2_enabled && INTEL_GEN(dev_priv) >= 8)
+ dpcd_val |= DP_PSR_CRC_VERIFICATION;
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, dpcd_val);
drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
@@ -415,6 +417,9 @@ static void hsw_activate_psr1(struct intel_dp *intel_dp)
else
val |= EDP_PSR_TP1_TP2_SEL;
+ if (INTEL_GEN(dev_priv) >= 8)
+ val |= EDP_PSR_CRC_ENABLE;
+
val |= I915_READ(EDP_PSR_CTL) & EDP_PSR_RESTORE_PSR_ACTIVE_CTX_MASK;
I915_WRITE(EDP_PSR_CTL, val);
}
@@ -1012,7 +1017,8 @@ void intel_psr_short_pulse(struct intel_dp *intel_dp)
struct i915_psr *psr = &dev_priv->psr;
u8 val;
const u8 errors = DP_PSR_RFB_STORAGE_ERROR |
- DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR;
+ DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR |
+ DP_PSR_LINK_CRC_ERROR;
if (!CAN_PSR(dev_priv) || !intel_dp_is_edp(intel_dp))
return;
@@ -1041,6 +1047,8 @@ void intel_psr_short_pulse(struct intel_dp *intel_dp)
DRM_DEBUG_KMS("PSR RFB storage error, disabling PSR\n");
if (val & DP_PSR_VSC_SDP_UNCORRECTABLE_ERROR)
DRM_DEBUG_KMS("PSR VSC SDP uncorrectable error, disabling PSR\n");
+ if (val & DP_PSR_LINK_CRC_ERROR)
+ DRM_ERROR("PSR Link CRC error, disabling PSR\n");
if (val & ~errors)
DRM_ERROR("PSR_ERROR_STATUS unhandled errors %x\n",
--
2.17.1
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