@@ -1439,6 +1439,13 @@ static inline u32 man_trk_ctl_single_full_frame_bit_get(struct drm_i915_private
PSR2_MAN_TRK_CTL_SF_SINGLE_FULL_FRAME;
}
+static inline u32 man_trk_ctl_partial_frame_bit_get(struct drm_i915_private *dev_priv)
+{
+ return IS_ALDERLAKE_P(dev_priv) ?
+ ADLP_PSR2_MAN_TRK_CTL_SF_PARTIAL_FRAME_UPDATE :
+ PSR2_MAN_TRK_CTL_SF_PARTIAL_FRAME_UPDATE;
+}
+
static void psr_force_hw_tracking_exit(struct intel_dp *intel_dp)
{
struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
@@ -1543,7 +1550,17 @@ static void psr2_man_trk_ctl_calc(struct intel_crtc_state *crtc_state,
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
- u32 val = PSR2_MAN_TRK_CTL_ENABLE;
+ u32 val = 0;
+
+ /*
+ * ADL_P doesn't have HW tracking nor manual tracking enable
+ * bit
+ */
+ if (!IS_ALDERLAKE_P(dev_priv))
+ val = PSR2_MAN_TRK_CTL_ENABLE;
+
+ /* SF partial frame enable has to be set even on full update */
+ val |= man_trk_ctl_partial_frame_bit_get(dev_priv);
if (full_update) {
/*
@@ -1563,7 +1580,6 @@ static void psr2_man_trk_ctl_calc(struct intel_crtc_state *crtc_state,
} else {
drm_WARN_ON(crtc_state->uapi.crtc->dev, clip->y1 % 4 || clip->y2 % 4);
- val |= PSR2_MAN_TRK_CTL_SF_PARTIAL_FRAME_UPDATE;
val |= PSR2_MAN_TRK_CTL_SU_REGION_START_ADDR(clip->y1 / 4 + 1);
val |= PSR2_MAN_TRK_CTL_SU_REGION_END_ADDR(clip->y2 / 4 + 1);
}
@@ -2316,6 +2316,7 @@
#define ADLP_PSR2_MAN_TRK_CTL_SU_REGION_START_ADDR(val) REG_FIELD_PREP(ADLP_PSR2_MAN_TRK_CTL_SU_REGION_START_ADDR_MASK, val)
#define ADLP_PSR2_MAN_TRK_CTL_SU_REGION_END_ADDR_MASK REG_GENMASK(12, 0)
#define ADLP_PSR2_MAN_TRK_CTL_SU_REGION_END_ADDR(val) REG_FIELD_PREP(ADLP_PSR2_MAN_TRK_CTL_SU_REGION_END_ADDR_MASK, val)
+#define ADLP_PSR2_MAN_TRK_CTL_SF_PARTIAL_FRAME_UPDATE REG_BIT(31)
#define ADLP_PSR2_MAN_TRK_CTL_SF_SINGLE_FULL_FRAME REG_BIT(14)
#define ADLP_PSR2_MAN_TRK_CTL_SF_CONTINUOS_FULL_FRAME REG_BIT(13)
Currently we are observing occasional screen flickering when PSR2 selective fetch is enabled. More specifically glitch seems to happen on full frame update when cursor moves to coords x = -1 or y = -1. According to Bspec SF Single full frame should not be set if SF Partial Frame Enable is not set. This happened to be true for ADLP as PSR2_MAN_TRK_CTL_ENABLE is always set and for ADLP it's actually "SF Partial Frame Enable" (Bit 31). Setting "SF Partial Frame Enable" bit also on full update seems to fix screen flickering. Also make code more clear by setting PSR2_MAN_TRK_CTL_ENABLE only if not on ADLP as this bit doesn't exist in ADLP. Bspec: 49274 Reported-by: Lyude Paul <lyude@redhat.com> Cc: Mihai Harpau <mishu@piatafinanciara.ro> Cc: José Roberto de Souza <jose.souza@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Bugzilla: https://gitlab.freedesktop.org/drm/intel/-/issues/5077 Signed-off-by: Jouni Högander <jouni.hogander@intel.com> --- drivers/gpu/drm/i915/display/intel_psr.c | 20 ++++++++++++++++++-- drivers/gpu/drm/i915/i915_reg.h | 1 + 2 files changed, 19 insertions(+), 2 deletions(-)