From: "Michel Dänzer" <michel@daenzer.net>
To: dri-devel@lists.freedesktop.org
Subject: [PATCH] drm/radeon: Don't flush the GART TLB if rdev->gart.ptr == NULL
Date: Fri, 3 Jul 2015 10:02:27 +0900 [thread overview]
Message-ID: <1435885347-5448-1-git-send-email-michel@daenzer.net> (raw)
From: Michel Dänzer <michel.daenzer@amd.com>
This can be the case when the GPU is powered off, e.g. via vgaswitcheroo
or runpm. When the GPU is powered up again, radeon_gart_table_vram_pin
flushes the TLB after setting rdev->gart.ptr to non-NULL.
Fixes panic on powering off R7xx GPUs.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61529
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
---
drivers/gpu/drm/radeon/radeon_gart.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
index 5450fa9..c4777c8 100644
--- a/drivers/gpu/drm/radeon/radeon_gart.c
+++ b/drivers/gpu/drm/radeon/radeon_gart.c
@@ -260,8 +260,10 @@ void radeon_gart_unbind(struct radeon_device *rdev, unsigned offset,
}
}
}
- mb();
- radeon_gart_tlb_flush(rdev);
+ if (rdev->gart.ptr) {
+ mb();
+ radeon_gart_tlb_flush(rdev);
+ }
}
/**
@@ -306,8 +308,10 @@ int radeon_gart_bind(struct radeon_device *rdev, unsigned offset,
page_base += RADEON_GPU_PAGE_SIZE;
}
}
- mb();
- radeon_gart_tlb_flush(rdev);
+ if (rdev->gart.ptr) {
+ mb();
+ radeon_gart_tlb_flush(rdev);
+ }
return 0;
}
--
2.1.4
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next reply other threads:[~2015-07-03 1:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-03 1:02 Michel Dänzer [this message]
2015-07-03 9:46 ` [PATCH] drm/radeon: Don't flush the GART TLB if rdev->gart.ptr == NULL Christian König
2015-07-03 19:27 ` Alex Deucher
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