Commit b10f1b20 authored Oct 22, 2015 by Maarten Lankhorst Committed by Jani Nikula Nov 02, 2015

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



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>

parent 6675bce2

drivers/gpu/drm/i915/intel_pm.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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],

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