From: Imre Deak Date: Fri, 12 Feb 2016 16:55:13 +0000 (+0200) Subject: drm/i915: Ensure the HW is powered when disabling VGA X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=6392f8478e6f119467b1ad06e30e1f078e62efc1;p=deliverable%2Flinux.git drm/i915: Ensure the HW is powered when disabling VGA 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 Reviewed-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/1455296121-4742-5-git-send-email-imre.deak@intel.com --- diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 82b05ca94cf8..f35d88fb5724 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -15664,10 +15664,12 @@ 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)