[PATCH v4 18/19] drm/i915/psr: Add new debug bit to disable Panel Replay

["Jouni Högander" <jouni.hogander@intel.com>]

Currently there is no way to disable Panel Replay without disabling
PSR. Add new debug bit to be used with i915_edp_psr_debug debugfs
interface.

v2: ensure that fastset is performed when the bit changes

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_types.h |  1 +
 drivers/gpu/drm/i915/display/intel_psr.c           | 14 +++++++++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 42400e1e9875..030ef84f5dd4 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -1690,6 +1690,7 @@ 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;
diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 0a5f0481c6ad..885c75c55f9a 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -1496,6 +1496,9 @@ _panel_replay_compute_config(struct intel_dp *intel_dp,
 	if (!CAN_PANEL_REPLAY(intel_dp))
 		return false;
 
+	if (intel_dp->psr.debug & I915_PSR_DEBUG_PANEL_REPLAY_DISABLE)
+		return false;
+
 	if (!intel_dp_is_edp(intel_dp))
 		return true;
 
@@ -2813,10 +2816,12 @@ 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;
-	u32 old_mode;
+	const u32 disable_bits = val & I915_PSR_DEBUG_PANEL_REPLAY_DISABLE;
+	u32 old_mode, old_disable_bits;
 	int ret;
 
-	if (val & ~(I915_PSR_DEBUG_IRQ | I915_PSR_DEBUG_MODE_MASK) ||
+	if (val & ~(I915_PSR_DEBUG_IRQ | 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);
 		return -EINVAL;
@@ -2827,6 +2832,9 @@ int intel_psr_debug_set(struct intel_dp *intel_dp, u64 val)
 		return ret;
 
 	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_PANEL_REPLAY_DISABLE);
 	intel_dp->psr.debug = val;
 
 	/*
@@ -2838,7 +2846,7 @@ int intel_psr_debug_set(struct intel_dp *intel_dp, u64 val)
 
 	mutex_unlock(&intel_dp->psr.lock);
 
-	if (old_mode != mode)
+	if (old_mode != mode || old_disable_bits != disable_bits)
 		ret = intel_psr_fastset_force(dev_priv);
 
 	return ret;
-- 
2.34.1