From d1ed629f44b3a4108d5c445971535f05f441fce7 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Fri, 17 Oct 2008 00:44:42 -0700 Subject: [PATCH] i915: Disable MSI on GM965 (errata says it doesn't work) Current Intel errata for the GM965 says that using MSI may cause interrupts to be delayed or lost. The only workaround offered is to not use it. Signed-off-by: Keith Packard Signed-off-by: Eric Anholt Signed-off-by: Dave Airlie --- drivers/gpu/drm/i915/i915_dma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index db34780..01de536 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -844,8 +844,11 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags) * correctly in testing on 945G. * This may be a side effect of MSI having been made available for PEG * and the registers being closely associated. + * + * According to chipset errata, on the 965GM, MSI interrupts may + * be lost or delayed */ - if (!IS_I945G(dev) && !IS_I945GM(dev)) + if (!IS_I945G(dev) && !IS_I945GM(dev) && !IS_I965GM(dev)) if (pci_enable_msi(dev->pdev)) DRM_ERROR("failed to enable MSI\n"); -- 2.7.4