From: Vinit Azad Date: Wed, 14 Aug 2013 20:34:33 +0000 (-0700) Subject: drm/i915: Only unmask required PM interrupts X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=fd547d25a8ac3f390fee4a689de86a64e3d65fe1;p=linux-beck.git drm/i915: Only unmask required PM interrupts Un-masking all PM interrupts causes hardware to generate interrupts regardless of whether the interrupts are enabled on the DE side. Since turbo only need up/down threshold and rc6 timeout interrupt, mask all other interrupts bits to avoid unnecessary overhead/wake up. Note that our interrupt handler isn't being fired since we do set the IER bits properly (IIR bits aren't set). The overhead isn't because our driver is reacting to these interrupts, but because hardware keeps generating internal messages when PMINTRMSK doesn't mask out the up/down EI interrupts (which happen periodically). Change-Id: I6c947df6fd5f60584d39b9e8b8c89faa51a5e827 Signed-off-by: Vinit Azad [danvet: Add follow-up explanation of the precise effects from Vinit as a note to the commit message.] Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 0d90064775c9..7bc3f1783174 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3453,8 +3453,8 @@ static void gen6_enable_rps_interrupts(struct drm_device *dev) I915_WRITE(GEN6_PMIMR, I915_READ(GEN6_PMIMR) & ~GEN6_PM_RPS_EVENTS); I915_WRITE(GEN6_PMIIR, GEN6_PM_RPS_EVENTS); spin_unlock_irq(&dev_priv->irq_lock); - /* unmask all PM interrupts */ - I915_WRITE(GEN6_PMINTRMSK, 0); + /* only unmask PM interrupts we need. Mask all others. */ + I915_WRITE(GEN6_PMINTRMSK, ~GEN6_PM_RPS_EVENTS); } static void gen6_enable_rps(struct drm_device *dev)