File linux-2.6.34-945-perf-fix.patch of Package kernel
From: Jesse Barnes <jbarnes@virtuousgeek.org> To: intel-gfx@lists.freedesktop.org, dri-devel@lists.sourceforge.net Cc: eric@anholt.net, airlied@linux.ie, Jesse Barnes <jbarnes@virtuousgeek.org> Subject: [PATCH 5/7] drm/i915: use vblank and vsync interrupts on 945 Date: Fri, 26 Mar 2010 11:07:19 -0700 On 945, vblank delivery alone seems unreliable. The PIPE*STAT bits get set correctly, but interrupts occur at a low frequency relative to refresh. If we enable VSYNC interrupts as well however (even though we only check for VBLANK interrupts when handling) we get the right frequency. Increases OA performance on my AspireOne by about 300% with the new DRI2 bits, which rely on high frequency vblank events. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> --- drivers/gpu/drm/i915/i915_irq.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 9519346..b16bb0d 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -45,8 +45,8 @@ */ #define I915_INTERRUPT_ENABLE_FIX \ (I915_ASLE_INTERRUPT | \ - I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | \ - I915_DISPLAY_PIPE_B_EVENT_INTERRUPT | \ + I915_DISPLAY_PIPE_A_VBLANK_INTERRUPT | \ + I915_DISPLAY_PIPE_B_VBLANK_INTERRUPT | \ I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT | \ I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT | \ I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT) @@ -1132,6 +1132,7 @@ int i915_enable_vblank(struct drm_device *dev, int pipe) PIPE_START_VBLANK_INTERRUPT_ENABLE); else i915_enable_pipestat(dev_priv, pipe, + PIPE_VSYNC_INTERRUPT_ENABLE | PIPE_VBLANK_INTERRUPT_ENABLE); spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags); return 0; @@ -1151,6 +1152,7 @@ void i915_disable_vblank(struct drm_device *dev, int pipe) DE_PIPEA_VBLANK: DE_PIPEB_VBLANK); else i915_disable_pipestat(dev_priv, pipe, + PIPE_VSYNC_INTERRUPT_ENABLE | PIPE_VBLANK_INTERRUPT_ENABLE | PIPE_START_VBLANK_INTERRUPT_ENABLE); spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags); -- 1.6.1.3
