From: Ville Syrjälä Date: Thu, 16 Oct 2014 18:29:48 +0000 (+0300) Subject: drm/i915: Don't kick the power seqeuncer just to check if we have vdd/panel power X-Git-Tag: firefly_0821_release~176^2~2672^2~64^2~111 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9a42356b964dee6418d8b812109298658cc8dc38;p=firefly-linux-kernel-4.4.55.git drm/i915: Don't kick the power seqeuncer just to check if we have vdd/panel power If there's no power sequencer assigned to the port currently we can't very well have vdd or panel power enabled either. If we would try to check that from the pps registers we'd need to pick a power seqeuncer and kick it. So let's skip the register read and the kick. Note that there's still a bit an issue about correctly recovering pps state from resume if the bios is nasty: With this check we'll always assume that the pps is off. But that's better done in a follow-up patch and it shouldn't be too harmful - at most we waste time enabling the pps if it's on already. Signed-off-by: Ville Syrjälä Reviewed-by: Imre Deak [danvet: Add note about resume issues Imre spotted.] Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 4f7df371c098..451dd253b5d6 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -597,6 +597,10 @@ static bool edp_have_panel_power(struct intel_dp *intel_dp) lockdep_assert_held(&dev_priv->pps_mutex); + if (IS_VALLEYVIEW(dev) && + intel_dp->pps_pipe == INVALID_PIPE) + return false; + return (I915_READ(_pp_stat_reg(intel_dp)) & PP_ON) != 0; } @@ -607,6 +611,10 @@ static bool edp_have_panel_vdd(struct intel_dp *intel_dp) lockdep_assert_held(&dev_priv->pps_mutex); + if (IS_VALLEYVIEW(dev) && + intel_dp->pps_pipe == INVALID_PIPE) + return false; + return I915_READ(_pp_ctrl_reg(intel_dp)) & EDP_FORCE_VDD; }