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radeon: Fix disabling PCI bus mastering on big endian hosts. 

It would previously write basically random bits to PCI configuration space...
Not very surprising that the GPU tended to stop responding completely. The
resulting MCE even froze the whole machine sometimes.

Now resetting the GPU after a lockup has at least a fighting chance of
succeeding.

Cc: stable@vger.kernel.org
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Michel Dänzer 2012-01-05 18:42:17 +01:00 committed by Dave Airlie
parent dea7e0ac45
commit 3df96909b7
2 changed files with 5 additions and 4 deletions
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5
drivers/gpu/drm/radeon/r100.c
View File

@ -2186,6 +2186,7 @@ bool r100_gpu_is_lockup(struct radeon_device *rdev, struct radeon_ring *ring)
void r100_bm_disable(struct radeon_device *rdev)
{
u32 tmp;
u16 tmp16;
/* disable bus mastering */
tmp = RREG32(R_000030_BUS_CNTL);
@ -2196,8 +2197,8 @@ void r100_bm_disable(struct radeon_device *rdev)
WREG32(R_000030_BUS_CNTL, (tmp & 0xFFFFFFFF) | 0x00000040);
tmp = RREG32(RADEON_BUS_CNTL);
mdelay(1);
pci_read_config_word(rdev->pdev, 0x4, (u16*)&tmp);
pci_write_config_word(rdev->pdev, 0x4, tmp & 0xFFFB);
pci_read_config_word(rdev->pdev, 0x4, &tmp16);
pci_write_config_word(rdev->pdev, 0x4, tmp16 & 0xFFFB);
mdelay(1);
}

4
drivers/gpu/drm/radeon/rs600.c
View File

@ -324,10 +324,10 @@ void rs600_hpd_fini(struct radeon_device *rdev)
void rs600_bm_disable(struct radeon_device *rdev)
{
u32 tmp;
u16 tmp;
/* disable bus mastering */
pci_read_config_word(rdev->pdev, 0x4, (u16*)&tmp);
pci_read_config_word(rdev->pdev, 0x4, &tmp);
pci_write_config_word(rdev->pdev, 0x4, tmp & 0xFFFB);
mdelay(1);
}