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| Started by | Kamal Mostafa <kamal@canonical.com> |
|---|---|
| First post | 2016-01-16 02:40 +0100 |
| Last post | 2016-01-16 02:40 +0100 |
| Articles | 1 — 1 participant |
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[PATCH 4.2.y-ckt 018/305] drm/radeon: Disable uncacheable CPU mappings of GTT with RV6xx Kamal Mostafa <kamal@canonical.com> - 2016-01-16 02:40 +0100
| From | Kamal Mostafa <kamal@canonical.com> |
|---|---|
| Date | 2016-01-16 02:40 +0100 |
| Subject | [PATCH 4.2.y-ckt 018/305] drm/radeon: Disable uncacheable CPU mappings of GTT with RV6xx |
| Message-ID | <qRo0r-5P2-39@gated-at.bofh.it> |
4.2.8-ckt2 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ From: =?UTF-8?q?Michel=20D=C3=A4nzer?= <michel.daenzer@amd.com> commit 96ea47c0ec8c012509116bee8c57414281428fc4 upstream. They reportedly cause random GPU hangs. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91268 Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Michel Dänzer <michel.daenzer@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/gpu/drm/radeon/radeon_object.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c index 6763627..6e88c1b0 100644 --- a/drivers/gpu/drm/radeon/radeon_object.c +++ b/drivers/gpu/drm/radeon/radeon_object.c @@ -221,6 +221,12 @@ int radeon_bo_create(struct radeon_device *rdev, if (!(rdev->flags & RADEON_IS_PCIE)) bo->flags &= ~(RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC); + /* Write-combined CPU mappings of GTT cause GPU hangs with RV6xx + * See https://bugs.freedesktop.org/show_bug.cgi?id=91268 + */ + if (rdev->family >= CHIP_RV610 && rdev->family <= CHIP_RV635) + bo->flags &= ~(RADEON_GEM_GTT_WC | RADEON_GEM_GTT_UC); + #ifdef CONFIG_X86_32 /* XXX: Write-combined CPU mappings of GTT seem broken on 32-bit * See https://bugs.freedesktop.org/show_bug.cgi?id=84627 -- 1.9.1
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