From: Dave Airlie Date: Wed, 31 Mar 2010 03:38:56 +0000 (+1000) Subject: drm/radeon/kms: add sanity check to wptr. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9e5786bd14cb9ffe29ebe66d41cedf03311b0d30;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 --- diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c index 138ddd49dfc5..c8f4b0300b70 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) |