From: Stéphane Marchesin <marc...@chromium.org> This speeds up boot and suspend/resume times.
BUG=chrome-os-partner:13364 TEST=by hand Change-Id: I8d7b7a22c50bcf32828d492e123ce301cefa297d Reviewed-on: https://gerrit.chromium.org/gerrit/37047 Reviewed-by: Simon Que <s...@chromium.org> Commit-Ready: Stéphane Marchesin <marc...@chromium.org> Tested-by: Stéphane Marchesin <marc...@chromium.org> --- drivers/gpu/drm/i915/intel_dp.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 29013de..f763d45 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1195,6 +1195,10 @@ void ironlake_edp_backlight_on(struct intel_dp *intel_dp) return; DRM_DEBUG_KMS("\n"); + pp = ironlake_get_pp_control(dev_priv); + if (pp & EDP_BLC_ENABLE) + return; + /* * If we enable the backlight right away following a panel power * on, we may see slight flicker as the panel syncs with the eDP @@ -1202,7 +1206,6 @@ void ironlake_edp_backlight_on(struct intel_dp *intel_dp) * allowing it to appear. */ msleep(intel_dp->backlight_on_delay); - pp = ironlake_get_pp_control(dev_priv); pp |= EDP_BLC_ENABLE; I915_WRITE(PCH_PP_CONTROL, pp); POSTING_READ(PCH_PP_CONTROL); @@ -1223,6 +1226,8 @@ void ironlake_edp_backlight_off(struct intel_dp *intel_dp) DRM_DEBUG_KMS("\n"); pp = ironlake_get_pp_control(dev_priv); + if (!(pp & EDP_BLC_ENABLE)) + return; pp &= ~EDP_BLC_ENABLE; I915_WRITE(PCH_PP_CONTROL, pp); POSTING_READ(PCH_PP_CONTROL); -- 1.8.3.2 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
