[PATCH 12/19] drm/i915/psr: Write the PR config DPCDs in burst mode

[Ankit Nautiyal <ankit.k.nautiyal@intel.com>]

Replace the consecutive single-byte writes to PANEL_REPLAY_CONFIG and
CONFIG2 with one drm_dp_dpcd_write() burst starting at PANEL_REPLAY_CONFIG,
reducing AUX transactions.

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
---
 drivers/gpu/drm/i915/display/intel_psr.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 5041a5a138d1..ee6e26abd05e 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -774,27 +774,33 @@ static bool psr2_su_region_et_valid(struct intel_connector *connector, bool pane
 static void _panel_replay_enable_sink(struct intel_dp *intel_dp,
 				      const struct intel_crtc_state *crtc_state)
 {
-	u8 val = DP_PANEL_REPLAY_ENABLE |
+	struct intel_display *display = to_intel_display(intel_dp);
+	u8 panel_replay_config = DP_PANEL_REPLAY_ENABLE |
 		DP_PANEL_REPLAY_VSC_SDP_CRC_EN |
 		DP_PANEL_REPLAY_UNRECOVERABLE_ERROR_EN |
 		DP_PANEL_REPLAY_RFB_STORAGE_ERROR_EN |
 		DP_PANEL_REPLAY_ACTIVE_FRAME_CRC_ERROR_EN;
 	u8 panel_replay_config2 = DP_PANEL_REPLAY_CRC_VERIFICATION;
+	u8 buf[2];
+	int ret;
 
 	if (crtc_state->has_sel_update)
-		val |= DP_PANEL_REPLAY_SU_ENABLE;
+		panel_replay_config |= DP_PANEL_REPLAY_SU_ENABLE;
 
 	if (crtc_state->enable_psr2_su_region_et)
-		val |= DP_PANEL_REPLAY_ENABLE_SU_REGION_ET;
+		panel_replay_config |= DP_PANEL_REPLAY_ENABLE_SU_REGION_ET;
 
 	if (crtc_state->req_psr2_sdp_prior_scanline)
 		panel_replay_config2 |=
 			DP_PANEL_REPLAY_SU_REGION_SCANLINE_CAPTURE;
 
-	drm_dp_dpcd_writeb(&intel_dp->aux, PANEL_REPLAY_CONFIG, val);
+	buf[0] = panel_replay_config;
+	buf[1] = panel_replay_config2;
+
+	ret = drm_dp_dpcd_write(&intel_dp->aux, PANEL_REPLAY_CONFIG, buf, sizeof(buf));
 
-	drm_dp_dpcd_writeb(&intel_dp->aux, PANEL_REPLAY_CONFIG2,
-			   panel_replay_config2);
+	if (ret < 0 || ret != sizeof(buf))
+		drm_dbg_kms(display->drm, "Failed to write Panel Replay Configs\n");
 }
 
 static void _psr_enable_sink(struct intel_dp *intel_dp,
-- 
2.45.2