From 11bab0ae9991b165b542294806013d1e06fb3294 Mon Sep 17 00:00:00 2001 From: Michel Dänzer Date: Fri, 19 Sep 2014 12:07:11 +0900 Subject: drm/radeon: Clear RB_OVERFLOW bit earlier MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Otherwise the bit remains set in rdev->ih.rptr, so the wptr can never match that and we still have an infinite loop. This fix allows me to successfully recover from an IH ring buffer overflow. Signed-off-by: Michel Dänzer Signed-off-by: Alex Deucher --- drivers/gpu/drm/radeon/r600.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/gpu/drm/radeon/r600.c') diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index 3cfb50056f7a..5514f1bb6fe1 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -3792,6 +3792,7 @@ static u32 r600_get_ih_wptr(struct radeon_device *rdev) wptr = RREG32(IH_RB_WPTR); if (wptr & RB_OVERFLOW) { + wptr &= ~RB_OVERFLOW; /* When a ring buffer overflow happen start parsing interrupt * from the last not overwritten vector (wptr + 16). Hopefully * this should allow us to catchup. @@ -3802,7 +3803,6 @@ static u32 r600_get_ih_wptr(struct radeon_device *rdev) tmp = RREG32(IH_RB_CNTL); tmp |= IH_WPTR_OVERFLOW_CLEAR; WREG32(IH_RB_CNTL, tmp); - wptr &= ~RB_OVERFLOW; } return (wptr & rdev->ih.ptr_mask); } -- cgit v1.2.3