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drm/i915/skl: Ensure HW is powered during DDB HW state readout

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The assumption when adding the intel_display_power_is_enabled() checks
was that if it returns success the power can't be turned off afterwards
during the HW access, which is guaranteed by modeset locks. This isn't
always true, so make sure we hold a dedicated reference for the time of
the access.

Spotted-by: Mika Kuoppala <mika.kuoppala@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93441
CC: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455719489-3008-1-git-send-email-imre.deak@intel.com
This commit is contained in:
Imre Deak 2016-02-17 16:31:29 +02:00
parent dd75619853
commit 4d80003023
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/i915/intel_pm.c
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@ -2851,7 +2851,10 @@ void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv,
memset(ddb, 0, sizeof(*ddb));
for_each_pipe(dev_priv, pipe) {
if (!intel_display_power_is_enabled(dev_priv, POWER_DOMAIN_PIPE(pipe)))
enum intel_display_power_domain power_domain;
power_domain = POWER_DOMAIN_PIPE(pipe);
if (!intel_display_power_get_if_enabled(dev_priv, power_domain))
continue;
for_each_plane(dev_priv, pipe, plane) {
@ -2863,6 +2866,8 @@ void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv,
val = I915_READ(CUR_BUF_CFG(pipe));
skl_ddb_entry_init_from_hw(&ddb->plane[pipe][PLANE_CURSOR],
val);
intel_display_power_put(dev_priv, power_domain);
}
}