drm/i915/psr: Add new debug bit to disable Panel Replay

Add new debug bit to be used with i915_edp_psr_debug debugfs
interface. This can be used to disable Panel Replay.

v2: ensure that fastset is performed when the bit changes
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240618053026.3268759-8-jouni.hogander@intel.com

drivers/gpu/drm/i915/display/intel_display_types.h

@@ -1703,6 +1703,7 @@ struct intel_psr {
 #define I915_PSR_DEBUG_ENABLE_SEL_FETCH		0x4
 #define I915_PSR_DEBUG_IRQ			0x10
 #define I915_PSR_DEBUG_SU_REGION_ET_DISABLE	0x20
+#define I915_PSR_DEBUG_PANEL_REPLAY_DISABLE	0x40
 
 	u32 debug;
 	bool sink_support;

drivers/gpu/drm/i915/display/intel_psr.c

@@ -249,7 +249,8 @@ static bool panel_replay_global_enabled(struct intel_dp *intel_dp)
 {
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 
-	if (i915->display.params.enable_psr != -1)
+	if ((i915->display.params.enable_psr != -1) ||
+	    (intel_dp->psr.debug & I915_PSR_DEBUG_PANEL_REPLAY_DISABLE))
 		return false;
 	return true;
 }
@@ -2788,11 +2789,13 @@ int intel_psr_debug_set(struct intel_dp *intel_dp, u64 val)
 {
 	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 	const u32 mode = val & I915_PSR_DEBUG_MODE_MASK;
-	const u32 disable_bits = val & I915_PSR_DEBUG_SU_REGION_ET_DISABLE;
+	const u32 disable_bits = val & (I915_PSR_DEBUG_SU_REGION_ET_DISABLE |
+					I915_PSR_DEBUG_PANEL_REPLAY_DISABLE);
 	u32 old_mode, old_disable_bits;
 	int ret;
 
 	if (val & ~(I915_PSR_DEBUG_IRQ | I915_PSR_DEBUG_SU_REGION_ET_DISABLE |
+		    I915_PSR_DEBUG_PANEL_REPLAY_DISABLE |
 		    I915_PSR_DEBUG_MODE_MASK) ||
 	    mode > I915_PSR_DEBUG_ENABLE_SEL_FETCH) {
 		drm_dbg_kms(&dev_priv->drm, "Invalid debug mask %llx\n", val);
@@ -2805,7 +2808,9 @@ int intel_psr_debug_set(struct intel_dp *intel_dp, u64 val)
 
 	old_mode = intel_dp->psr.debug & I915_PSR_DEBUG_MODE_MASK;
 	old_disable_bits = intel_dp->psr.debug &
-		I915_PSR_DEBUG_SU_REGION_ET_DISABLE;
+		(I915_PSR_DEBUG_SU_REGION_ET_DISABLE |
+		 I915_PSR_DEBUG_PANEL_REPLAY_DISABLE);
+
 	intel_dp->psr.debug = val;
 
 	/*