From: =?UTF-8?q?Jos=C3=A9=20Roberto=20de=20Souza?= <jose.souza@intel.com>
Date: Wed, 28 Mar 2018 15:30:39 -0700
Subject: drm/i915/psr: Nuke aux frame sync
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Git-commit: 6ce9b78a7388c37b33293666aa6fc61c177046e6
Patch-mainline: v4.18-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

eDP spec states that aux frame is required to do PSR2 selective
update but i915 don't fully implement it. It sends the aux frame
sync messages but the value is always zero as the GTC is not enabled
in driver.

Through tests was findout that pannels can do selective update when
the y-coordinate is also included in SDP, that is why it is required
to run PSR2 in i915.

A dummy value is not useful at all to sink, so removing everything
related to aux frame sync, if GTC is enabled we can bring this back.

Cc: Vathsala Nagaraju <vathsala.nagaraju@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180328223046.16125-3-jose.souza@intel.com

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/i915/i915_drv.h  |    1 -
 drivers/gpu/drm/i915/intel_psr.c |   24 +-----------------------
 2 files changed, 1 insertion(+), 24 deletions(-)

--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -603,7 +603,6 @@ struct i915_psr {
 	struct delayed_work work;
 	unsigned busy_frontbuffer_bits;
 	bool psr2_support;
-	bool aux_frame_sync;
 	bool link_standby;
 	bool y_cord_support;
 	bool colorimetry_support;
--- a/drivers/gpu/drm/i915/intel_psr.c
+++ b/drivers/gpu/drm/i915/intel_psr.c
@@ -137,16 +137,9 @@ void intel_psr_init_dpcd(struct intel_dp
 
 	if (INTEL_GEN(dev_priv) >= 9 &&
 	    (intel_dp->psr_dpcd[0] & DP_PSR2_IS_SUPPORTED)) {
-		uint8_t frame_sync_cap;
 
 		dev_priv->psr.sink_support = true;
-		if (drm_dp_dpcd_readb(&intel_dp->aux,
-				      DP_SINK_DEVICE_AUX_FRAME_SYNC_CAP,
-				      &frame_sync_cap) != 1)
-			frame_sync_cap = 0;
-		dev_priv->psr.aux_frame_sync = frame_sync_cap & DP_AUX_FRAME_SYNC_CAP;
-		/* PSR2 needs frame sync as well */
-		dev_priv->psr.psr2_support = dev_priv->psr.aux_frame_sync;
+		dev_priv->psr.psr2_support = true;
 		DRM_DEBUG_KMS("PSR2 %s on sink",
 			      dev_priv->psr.psr2_support ? "supported" : "not supported");
 
@@ -268,12 +261,6 @@ static void hsw_psr_enable_sink(struct i
 	struct drm_device *dev = dig_port->base.base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 
-
-	/* Enable AUX frame sync at sink */
-	if (dev_priv->psr.aux_frame_sync)
-		drm_dp_dpcd_writeb(&intel_dp->aux,
-				DP_SINK_DEVICE_AUX_FRAME_SYNC_CONF,
-				DP_AUX_FRAME_SYNC_ENABLE);
 	/* Enable ALPM at sink for psr2 */
 	if (dev_priv->psr.psr2_support && dev_priv->psr.alpm)
 		drm_dp_dpcd_writeb(&intel_dp->aux,
@@ -712,11 +699,6 @@ static void hsw_psr_disable(struct intel
 		i915_reg_t psr_status;
 		u32 psr_status_mask;
 
-		if (dev_priv->psr.aux_frame_sync)
-			drm_dp_dpcd_writeb(&intel_dp->aux,
-					DP_SINK_DEVICE_AUX_FRAME_SYNC_CONF,
-					0);
-
 		if (dev_priv->psr.psr2_support) {
 			psr_status = EDP_PSR2_STATUS;
 			psr_status_mask = EDP_PSR2_STATUS_STATE_MASK;
@@ -860,10 +842,6 @@ static void intel_psr_exit(struct drm_i9
 		return;
 
 	if (HAS_DDI(dev_priv)) {
-		if (dev_priv->psr.aux_frame_sync)
-			drm_dp_dpcd_writeb(&intel_dp->aux,
-					DP_SINK_DEVICE_AUX_FRAME_SYNC_CONF,
-					0);
 		if (dev_priv->psr.psr2_support) {
 			val = I915_READ(EDP_PSR2_CTL);
 			WARN_ON(!(val & EDP_PSR2_ENABLE));