This is a note to let you know that I've just added the patch titled
drm/radeon: update wait_for_vblank for r1xx-r4xx
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-radeon-update-wait_for_vblank-for-r1xx-r4xx.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2b48b968c0d00aa5ab520b65a15a4f374cda7dda Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Tue, 9 Apr 2013 18:32:01 -0400
Subject: drm/radeon: update wait_for_vblank for r1xx-r4xx
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;
}
}
}
Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are
queue-3.8/drm-radeon-fix-typo-in-rv515_mc_resume.patch
queue-3.8/drm-radeon-update-wait_for_vblank-for-evergreen.patch
queue-3.8/drm-radeon-add-some-new-si-pci-ids.patch
queue-3.8/drm-radeon-dce6-add-missing-display-reg-for-tiling-setup.patch
queue-3.8/drm-radeon-don-t-use-get_engine_clock-on-apus.patch
queue-3.8/drm-radeon-update-wait_for_vblank-for-r5xx-r7xx.patch
queue-3.8/drm-radeon-properly-lock-disp-in-mc_stop-resume-for-r5xx-r7xx.patch
queue-3.8/drm-radeon-update-wait_for_vblank-for-r1xx-r4xx.patch
queue-3.8/drm-radeon-disable-the-crtcs-in-mc_stop-evergreen-v2.patch
queue-3.8/drm-radeon-use-frac-fb-div-on-rs780-rs880.patch
queue-3.8/drm-radeon-properly-lock-disp-in-mc_stop-resume-for-evergreen.patch
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