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drm/i915: Ensure the HW is powered when disabling VGA

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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.

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-5-git-send-email-imre.deak@intel.com
(cherry picked from commit 6392f8478e)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Imre Deak 2016-02-12 18:55:13 +02:00 committed by Jani Nikula
parent 013ef6cfc4
commit bacd67d6a3
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/intel_display.c
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@ -15599,10 +15599,12 @@ void i915_redisable_vga(struct drm_device *dev)
* level, just check if the power well is enabled instead of trying to
* follow the "don't touch the power well if we don't need it" policy
* the rest of the driver uses. */
if (!intel_display_power_is_enabled(dev_priv, POWER_DOMAIN_VGA))
if (!intel_display_power_get_if_enabled(dev_priv, POWER_DOMAIN_VGA))
return;
i915_redisable_vga_power_on(dev);
intel_display_power_put(dev_priv, POWER_DOMAIN_VGA);
}
static bool primary_get_hw_state(struct intel_plane *plane)