From: Daniel Vetter Date: Thu, 4 Jul 2013 21:35:34 +0000 (+0200) Subject: drm/i915: simplify rps interrupt enabling/disabling sequence X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a0b3335a2141aadb8f2398ade97fe574f2ddc875;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git drm/i915: simplify rps interrupt enabling/disabling sequence At the moment we have the following interrupt enabling sequence: 1. irq preinstall hook 2. enabling the interrupt handler and calling irq postinstall hook 3. enable rps interrupts from the async work And the folliwing disable sequence: 1. disabling the interrupt handler and calling the uninstall hook 2. disabling the rps interrupt Since the postinstall hook now always sets up PMIIR, PMIER and PMIMR to known-good states there no way for an interrupt to sneak in in the enable sequence, so we can reinstate the WARN lost in commit eda63ffb906c2fb3b609a0e87aeb63c0f25b9e6b Author: Ben Widawsky Date: Tue May 28 19:22:26 2013 -0700 drm/i915: Add PM regs to pre/post install Note that there's some room for future cleanups since most of the interrupt register clearing in the disable function is rather redundant. But that's better done in follow-up patches, if at all. Cc: Ben Widawsky Reviewed-by: Ben Widawsky Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 787a528e7200..bc5aae088550 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3193,9 +3193,7 @@ static void gen6_enable_rps_interrupts(struct drm_device *dev) struct drm_i915_private *dev_priv = dev->dev_private; spin_lock_irq(&dev_priv->irq_lock); - /* FIXME: Our interrupt enabling sequence is bonghits. - * dev_priv->rps.pm_iir really should be 0 here. */ - dev_priv->rps.pm_iir = 0; + WARN_ON(dev_priv->rps.pm_iir); 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);