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drm/radeon/kms: add sanity check to wptr. 

If we resume in a bad way, we'll get 0xffffffff in wptr, and then
oops with no console. This just adds a sanity check so that we can
avoid the oops and hopefully get more details out of people's systems.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2010-03-31 13:38:56 +10:00
parent fb668c2fed
commit 9e5786bd14
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/radeon/r100.c
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@ -744,6 +744,8 @@ int r100_cp_init(struct radeon_device *rdev, unsigned ring_size)
udelay(10);
rdev->cp.rptr = RREG32(RADEON_CP_RB_RPTR);
rdev->cp.wptr = RREG32(RADEON_CP_RB_WPTR);
/* protect against crazy HW on resume */
rdev->cp.wptr &= rdev->cp.ptr_mask;
/* Set cp mode to bus mastering & enable cp*/
WREG32(RADEON_CP_CSQ_MODE,
REG_SET(RADEON_INDIRECT2_START, indirect2_start) |