[Intel-gfx] [PATCH 09/11] drm/i915/skl: Prevent unclaimed register writes on skylake.

Maarten Lankhorst maarten.lankhorst at linux.intel.com
Thu Oct 22 04:56:34 PDT 2015

I'm getting unclaimed register writes when checking the WM registers
after the crtc is disabled. So I would imagine those are guarded by
the crtc power well. Fix this by not reading out wm state when the
power well is off.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92181
Cc: stable at vger.kernel.org
 drivers/gpu/drm/i915/intel_pm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 4c1c1bb96a9e..fbc10331055e 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2833,7 +2833,12 @@ void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv,
 	int plane;
 	u32 val;
+	memset(ddb, 0, sizeof(*ddb));
 	for_each_pipe(dev_priv, pipe) {
+		if (!intel_display_power_is_enabled(dev_priv, POWER_DOMAIN_PIPE(pipe)))
+			continue;
 		for_each_plane(dev_priv, pipe, plane) {
 			val = I915_READ(PLANE_BUF_CFG(pipe, plane));

More information about the Intel-gfx mailing list