[Intel-gfx] [PATCH] drm/i915/display/psr: Print in debugfs if PSR is not enabled because of sink

[José Roberto de Souza]

Right now if sink reported any PSR error or if it fails to
acknowledge the PSR wakeup it sets a flag and do not attempt to
enable PSR anymore. That is the safest approach to avoid repetitive
glitches and allowed us to have PSR enabled by default.

But from time to time even good PSR panels have a PSR error, causing
tests to fail. And for now we are not yet to the point were we could
try to recover from PSR errors, so lets add this information to the
debugfs so IGT can check if PSR is disabled because of sink errors or
not and eliminate this noise from CI runs.

Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
Cc: Ap Kamal <kamal.ap at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index bc0bdf0419e0..07e368ec4fb8 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2194,8 +2194,12 @@ static int i915_edp_psr_status(struct seq_file *m, void *data)
 		status = "disabled";
 	seq_printf(m, "PSR mode: %s\n", status);
 
-	if (!psr->enabled)
+	if (!psr->enabled) {
+		seq_printf(m, "PSR sink not reliable: %s\n",
+			   yesno(psr->sink_not_reliable));
+
 		goto unlock;
+	}
 
 	if (psr->psr2_enabled) {
 		val = I915_READ(EDP_PSR2_CTL(dev_priv->psr.transcoder));
-- 
2.23.0