[Intel-gfx] [PATCH] drm/i915: Don't sanitize frame start delay if the pipe is off

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Avoid touching PIPECONF in intel_sanitize_crtc() unless the pipe is
actually on. Should cure some unclaimed register accesses.

We don't have to sanitize this if the pipe is off since we will
overwrite the frame start delay anyway when turning the pipe on.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102249
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 23aa7191024e..e6fcbc5abc75 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -14812,7 +14812,7 @@ static void intel_sanitize_crtc(struct intel_crtc *crtc,
 	enum transcoder cpu_transcoder = crtc->config->cpu_transcoder;
 
 	/* Clear any frame start delays used for debugging left by the BIOS */
-	if (!transcoder_is_dsi(cpu_transcoder)) {
+	if (crtc->active && !transcoder_is_dsi(cpu_transcoder)) {
 		i915_reg_t reg = PIPECONF(cpu_transcoder);
 
 		I915_WRITE(reg,
-- 
2.13.6