drm/i915/psr: Implement Wa_14015648006

PSR WM optimization should be disabled based on any wm level being
disabled. Also same WA should be applied for ICL as well.

Bspec: 71580

v5:
 - Set in pre plane hook and clear in post plane hook
v4:
 - Handle mode change in psr enable/disable
 - Handle wm_level_disable changes separately in pre plane hook
v3:
 - Split patch
v2:
 - set/clear chicken bit in post_plane_update
 - apply for ICL as well

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230329150703.432072-4-jouni.hogander@intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index ab146b5..4236ad7 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1157,6 +1157,7 @@ struct intel_crtc_state {
        bool has_psr2;
        bool enable_psr2_sel_fetch;
        bool req_psr2_sdp_prior_scanline;
+       bool wm_level_disabled;
        u32 dc3co_exitline;
        u16 su_y_granularity;
        struct drm_dp_vsc_sdp psr_vsc;

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 770f6fe..98f48eb 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1136,6 +1136,7 @@ static u32 wa_16013835468_bit_get(struct intel_dp *intel_dp)
 
 /*
  * Wa_16013835468
+ * Wa_14015648006
  */
 static void wm_optimization_wa(struct intel_dp *intel_dp,
                               const struct intel_crtc_state *crtc_state)
@@ -1143,6 +1144,11 @@ static void wm_optimization_wa(struct intel_dp *intel_dp,
        struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
        bool set_wa_bit = false;
 
+       /* Wa_14015648006 */
+       if (IS_MTL_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B0) ||
+           IS_DISPLAY_VER(dev_priv, 11, 13))
+               set_wa_bit |= crtc_state->wm_level_disabled;
+
        /* Wa_16013835468 */
        if (DISPLAY_VER(dev_priv) == 12)
                set_wa_bit |= crtc_state->hw.adjusted_mode.crtc_vblank_start !=
@@ -1197,6 +1203,7 @@ static void intel_psr_enable_source(struct intel_dp *intel_dp,
 
        /*
         * Wa_16013835468
+        * Wa_14015648006
         */
        wm_optimization_wa(intel_dp, crtc_state);
 
@@ -1374,8 +1381,9 @@ static void intel_psr_disable_locked(struct intel_dp *intel_dp)
 
        /*
         * Wa_16013835468
+        * Wa_14015648006
         */
-       if (DISPLAY_VER(dev_priv) == 12)
+       if (DISPLAY_VER(dev_priv) >= 11)
                intel_de_rmw(dev_priv, GEN8_CHICKEN_DCPR_1,
                             wa_16013835468_bit_get(intel_dp), 0);
 
@@ -1949,6 +1957,9 @@ void intel_psr_pre_plane_update(struct intel_atomic_state *state,
 
                if (psr->enabled && needs_to_disable)
                        intel_psr_disable_locked(intel_dp);
+               else if (psr->enabled && new_crtc_state->wm_level_disabled)
+                       /* Wa_14015648006 */
+                       wm_optimization_wa(intel_dp, new_crtc_state);
 
                mutex_unlock(&psr->lock);
        }
@@ -1978,6 +1989,9 @@ static void _intel_psr_post_plane_update(const struct intel_atomic_state *state,
 
                if (!psr->enabled && !keep_disabled)
                        intel_psr_enable_locked(intel_dp, crtc_state);
+               else if (psr->enabled && !crtc_state->wm_level_disabled)
+                       /* Wa_14015648006 */
+                       wm_optimization_wa(intel_dp, crtc_state);
 
                /* Force a PSR exit when enabling CRC to avoid CRC timeouts */
                if (crtc_state->crc_enabled && psr->enabled)

diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c
index ff70225..7e2e76a 100644 (file)
--- a/drivers/gpu/drm/i915/display/skl_watermark.c
+++ b/drivers/gpu/drm/i915/display/skl_watermark.c
@@ -2276,9 +2276,12 @@ static int skl_wm_check_vblank(struct intel_crtc_state *crtc_state)
                return level;
 
        /*
-        * FIXME PSR needs to toggle LATENCY_REPORTING_REMOVED_PIPE_*
+        * PSR needs to toggle LATENCY_REPORTING_REMOVED_PIPE_*
         * based on whether we're limited by the vblank duration.
-        *
+        */
+       crtc_state->wm_level_disabled = level < i915->display.wm.num_levels - 1;
+
+       /*
         * FIXME also related to skl+ w/a 1136 (also unimplemented as of
         * now) perhaps?
         */