From 9e5786bd14cb9ffe29ebe66d41cedf03311b0d30 Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Wed, 31 Mar 2010 13:38:56 +1000 Subject: [PATCH] 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 --- drivers/gpu/drm/radeon/r100.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c index 138ddd49dfc..c8f4b0300b7 100644 --- a/drivers/gpu/drm/radeon/r100.c +++ b/drivers/gpu/drm/radeon/r100.c @@ -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) | -- 2.34.1