From: Imre Deak Date: Wed, 17 Feb 2016 14:31:29 +0000 (+0200) Subject: drm/i915/skl: Ensure HW is powered during DDB HW state readout X-Git-Tag: next-20160301~68^2~27 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4d800030238878c1a98d1d3a37a3d673eea661ce;p=karo-tx-linux.git drm/i915/skl: Ensure HW is powered during DDB HW state readout 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 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93441 CC: Chris Wilson Signed-off-by: Imre Deak Reviewed-by: Mika Kuoppala Link: http://patchwork.freedesktop.org/patch/msgid/1455719489-3008-1-git-send-email-imre.deak@intel.com --- diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index b63cdb23b222..347d4df49a9b 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -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); } }