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drm/i915/skl: Prevent unclaimed register writes on skylake.

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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.

Cc: stable@vger.kernel.org # v4.3
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92181
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Maarten Lankhorst 2015-10-22 13:56:34 +02:00 committed by Jani Nikula
parent 6675bce251
commit b10f1b2017
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/i915/intel_pm.c
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@ -2818,7 +2818,12 @@ 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));
skl_ddb_entry_init_from_hw(&ddb->plane[pipe][plane],