3.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Alex Deucher <alexander.deucher@xxxxxxx>
commit 2b48b968c0d00aa5ab520b65a15a4f374cda7dda upstream.
Properly wait for the next vblank region. The previous
code didn't always wait long enough depending on the timing.
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/r100.c | 77 ++++++++++++++++++++++++++++--------------
1 file changed, 53 insertions(+), 24 deletions(-)
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -69,6 +69,38 @@ MODULE_FIRMWARE(FIRMWARE_R520);
* and others in some cases.
*/
+static bool r100_is_in_vblank(struct radeon_device *rdev, int crtc)
+{
+ if (crtc == 0) {
+ if (RREG32(RADEON_CRTC_STATUS) & RADEON_CRTC_VBLANK_CUR)
+ return true;
+ else
+ return false;
+ } else {
+ if (RREG32(RADEON_CRTC2_STATUS) & RADEON_CRTC2_VBLANK_CUR)
+ return true;
+ else
+ return false;
+ }
+}
+
+static bool r100_is_counter_moving(struct radeon_device *rdev, int crtc)
+{
+ u32 vline1, vline2;
+
+ if (crtc == 0) {
+ vline1 = (RREG32(RADEON_CRTC_VLINE_CRNT_VLINE) >> 16) & RADEON_CRTC_V_TOTAL;
+ vline2 = (RREG32(RADEON_CRTC_VLINE_CRNT_VLINE) >> 16) & RADEON_CRTC_V_TOTAL;
+ } else {
+ vline1 = (RREG32(RADEON_CRTC2_VLINE_CRNT_VLINE) >> 16) & RADEON_CRTC_V_TOTAL;
+ vline2 = (RREG32(RADEON_CRTC2_VLINE_CRNT_VLINE) >> 16) & RADEON_CRTC_V_TOTAL;
+ }
+ if (vline1 != vline2)
+ return true;
+ else
+ return false;
+}
+
/**
* r100_wait_for_vblank - vblank wait asic callback.
*
@@ -79,36 +111,33 @@ MODULE_FIRMWARE(FIRMWARE_R520);
*/
void r100_wait_for_vblank(struct radeon_device *rdev, int crtc)
{
- int i;
+ unsigned i = 0;
if (crtc >= rdev->num_crtc)
return;
if (crtc == 0) {
- if (RREG32(RADEON_CRTC_GEN_CNTL) & RADEON_CRTC_EN) {
- for (i = 0; i < rdev->usec_timeout; i++) {
- if (!(RREG32(RADEON_CRTC_STATUS) & RADEON_CRTC_VBLANK_CUR))
- break;
- udelay(1);
- }
- for (i = 0; i < rdev->usec_timeout; i++) {
- if (RREG32(RADEON_CRTC_STATUS) & RADEON_CRTC_VBLANK_CUR)
- break;
- udelay(1);
- }
- }
+ if (!(RREG32(RADEON_CRTC_GEN_CNTL) & RADEON_CRTC_EN))
+ return;
} else {
- if (RREG32(RADEON_CRTC2_GEN_CNTL) & RADEON_CRTC2_EN) {
- for (i = 0; i < rdev->usec_timeout; i++) {
- if (!(RREG32(RADEON_CRTC2_STATUS) & RADEON_CRTC2_VBLANK_CUR))
- break;
- udelay(1);
- }
- for (i = 0; i < rdev->usec_timeout; i++) {
- if (RREG32(RADEON_CRTC2_STATUS) & RADEON_CRTC2_VBLANK_CUR)
- break;
- udelay(1);
- }
+ if (!(RREG32(RADEON_CRTC2_GEN_CNTL) & RADEON_CRTC2_EN))
+ return;
+ }
+
+ /* depending on when we hit vblank, we may be close to active; if so,
+ * wait for another frame.
+ */
+ while (r100_is_in_vblank(rdev, crtc)) {
+ if (i++ % 100 == 0) {
+ if (!r100_is_counter_moving(rdev, crtc))
+ break;
+ }
+ }
+
+ while (!r100_is_in_vblank(rdev, crtc)) {
+ if (i++ % 100 == 0) {
+ if (!r100_is_counter_moving(rdev, crtc))
+ break;
}
}
}
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