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drm/radeon: Don't read from CP ring write pointer registers.

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Apparently this doesn't always work reliably, e.g. at resume time.

Just initialize to 0, so the ring is considered empty.

Tested with hibernation on Sumo and Cayman cards.

Should fix https://bugs.launchpad.net/ubuntu/+source/linux/+bug/820746/ .

Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Michel Dänzer 2011-09-13 11:27:35 +02:00 committed by Dave Airlie
parent ff02b13f68
commit 87463ff83b
4 changed files with 12 additions and 14 deletions
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4
drivers/gpu/drm/radeon/evergreen.c
View File

@ -1404,7 +1404,8 @@ int evergreen_cp_resume(struct radeon_device *rdev)
/* Initialize the ring buffer's read and write pointers */
WREG32(CP_RB_CNTL, tmp | RB_RPTR_WR_ENA);
WREG32(CP_RB_RPTR_WR, 0);
WREG32(CP_RB_WPTR, 0);
rdev->cp.wptr = 0;
WREG32(CP_RB_WPTR, rdev->cp.wptr);
/* set the wb address wether it's enabled or not */
WREG32(CP_RB_RPTR_ADDR,
@ -1426,7 +1427,6 @@ int evergreen_cp_resume(struct radeon_device *rdev)
WREG32(CP_DEBUG, (1 << 27) | (1 << 28));
rdev->cp.rptr = RREG32(CP_RB_RPTR);
rdev->cp.wptr = RREG32(CP_RB_WPTR);
evergreen_cp_start(rdev);
rdev->cp.ready = true;

12
drivers/gpu/drm/radeon/ni.c
View File

@ -1187,7 +1187,8 @@ int cayman_cp_resume(struct radeon_device *rdev)
/* Initialize the ring buffer's read and write pointers */
WREG32(CP_RB0_CNTL, tmp | RB_RPTR_WR_ENA);
WREG32(CP_RB0_WPTR, 0);
rdev->cp.wptr = 0;
WREG32(CP_RB0_WPTR, rdev->cp.wptr);
/* set the wb address wether it's enabled or not */
WREG32(CP_RB0_RPTR_ADDR, (rdev->wb.gpu_addr + RADEON_WB_CP_RPTR_OFFSET) & 0xFFFFFFFC);
@ -1207,7 +1208,6 @@ int cayman_cp_resume(struct radeon_device *rdev)
WREG32(CP_RB0_BASE, rdev->cp.gpu_addr >> 8);
rdev->cp.rptr = RREG32(CP_RB0_RPTR);
rdev->cp.wptr = RREG32(CP_RB0_WPTR);
/* ring1 - compute only */
/* Set ring buffer size */
@ -1220,7 +1220,8 @@ int cayman_cp_resume(struct radeon_device *rdev)
/* Initialize the ring buffer's read and write pointers */
WREG32(CP_RB1_CNTL, tmp | RB_RPTR_WR_ENA);
WREG32(CP_RB1_WPTR, 0);
rdev->cp1.wptr = 0;
WREG32(CP_RB1_WPTR, rdev->cp1.wptr);
/* set the wb address wether it's enabled or not */
WREG32(CP_RB1_RPTR_ADDR, (rdev->wb.gpu_addr + RADEON_WB_CP1_RPTR_OFFSET) & 0xFFFFFFFC);
@ -1232,7 +1233,6 @@ int cayman_cp_resume(struct radeon_device *rdev)
WREG32(CP_RB1_BASE, rdev->cp1.gpu_addr >> 8);
rdev->cp1.rptr = RREG32(CP_RB1_RPTR);
rdev->cp1.wptr = RREG32(CP_RB1_WPTR);
/* ring2 - compute only */
/* Set ring buffer size */
@ -1245,7 +1245,8 @@ int cayman_cp_resume(struct radeon_device *rdev)
/* Initialize the ring buffer's read and write pointers */
WREG32(CP_RB2_CNTL, tmp | RB_RPTR_WR_ENA);
WREG32(CP_RB2_WPTR, 0);
rdev->cp2.wptr = 0;
WREG32(CP_RB2_WPTR, rdev->cp2.wptr);
/* set the wb address wether it's enabled or not */
WREG32(CP_RB2_RPTR_ADDR, (rdev->wb.gpu_addr + RADEON_WB_CP2_RPTR_OFFSET) & 0xFFFFFFFC);
@ -1257,7 +1258,6 @@ int cayman_cp_resume(struct radeon_device *rdev)
WREG32(CP_RB2_BASE, rdev->cp2.gpu_addr >> 8);
rdev->cp2.rptr = RREG32(CP_RB2_RPTR);
rdev->cp2.wptr = RREG32(CP_RB2_WPTR);
/* start the rings */
cayman_cp_start(rdev);

6
drivers/gpu/drm/radeon/r100.c
View File

@ -990,7 +990,8 @@ int r100_cp_init(struct radeon_device *rdev, unsigned ring_size)
/* Force read & write ptr to 0 */
WREG32(RADEON_CP_RB_CNTL, tmp | RADEON_RB_RPTR_WR_ENA | RADEON_RB_NO_UPDATE);
WREG32(RADEON_CP_RB_RPTR_WR, 0);
WREG32(RADEON_CP_RB_WPTR, 0);
rdev->cp.wptr = 0;
WREG32(RADEON_CP_RB_WPTR, rdev->cp.wptr);
/* set the wb address whether it's enabled or not */
WREG32(R_00070C_CP_RB_RPTR_ADDR,
@ -1007,9 +1008,6 @@ int r100_cp_init(struct radeon_device *rdev, unsigned ring_size)
WREG32(RADEON_CP_RB_CNTL, tmp);
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) |

4
drivers/gpu/drm/radeon/r600.c
View File

@ -2209,7 +2209,8 @@ int r600_cp_resume(struct radeon_device *rdev)
/* Initialize the ring buffer's read and write pointers */
WREG32(CP_RB_CNTL, tmp | RB_RPTR_WR_ENA);
WREG32(CP_RB_RPTR_WR, 0);
WREG32(CP_RB_WPTR, 0);
rdev->cp.wptr = 0;
WREG32(CP_RB_WPTR, rdev->cp.wptr);
/* set the wb address whether it's enabled or not */
WREG32(CP_RB_RPTR_ADDR,
@ -2231,7 +2232,6 @@ int r600_cp_resume(struct radeon_device *rdev)
WREG32(CP_DEBUG, (1 << 27) | (1 << 28));
rdev->cp.rptr = RREG32(CP_RB_RPTR);
rdev->cp.wptr = RREG32(CP_RB_WPTR);
r600_cp_start(rdev);
rdev->cp.ready = true;