[PATCH v2 5/9] drm/i915/psr: Allow setting I915_PSR_DEBUG_SU_REGION_ET_DISABLE via debugfs

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

Currently setting I915_PSR_DEBUG_SU_REGION_ET_DISABLE (0x20) via psr_debug
debugfs interface is not allowed. This patch allows it.

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_psr.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
index 0e081ea21766..64c5d03aff03 100644
--- a/drivers/gpu/drm/i915/display/intel_psr.c
+++ b/drivers/gpu/drm/i915/display/intel_psr.c
@@ -3021,10 +3021,12 @@ 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_SU_REGION_ET_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_SU_REGION_ET_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;
@@ -3034,7 +3036,9 @@ int intel_psr_debug_set(struct intel_dp *intel_dp, u64 val)
 	if (ret)
 		return ret;
 
-	old_mode = intel_dp->psr.debug & I915_PSR_DEBUG_MODE_MASK;
+	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;
 	intel_dp->psr.debug = val;
 
 	/*
@@ -3046,7 +3050,7 @@ 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