This is a note to let you know that I've just added the patch titled
drm/radeon: update wait_for_vblank for evergreen+
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-evergreen.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 10257a6d8359c41407eb26b7ad7bf710a7e00155 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Tue, 9 Apr 2013 18:49:59 -0400
Subject: drm/radeon: update wait_for_vblank for evergreen+
From: Alex Deucher <alexander.deucher@xxxxxxx>
commit 10257a6d8359c41407eb26b7ad7bf710a7e00155 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/evergreen.c | 44 ++++++++++++++++++++++++++++++-------
1 file changed, 36 insertions(+), 8 deletions(-)
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -105,6 +105,27 @@ void evergreen_fix_pci_max_read_req_size
}
}
+static bool dce4_is_in_vblank(struct radeon_device *rdev, int crtc)
+{
+ if (RREG32(EVERGREEN_CRTC_STATUS + crtc_offsets[crtc]) & EVERGREEN_CRTC_V_BLANK)
+ return true;
+ else
+ return false;
+}
+
+static bool dce4_is_counter_moving(struct radeon_device *rdev, int crtc)
+{
+ u32 pos1, pos2;
+
+ pos1 = RREG32(EVERGREEN_CRTC_STATUS_POSITION + crtc_offsets[crtc]);
+ pos2 = RREG32(EVERGREEN_CRTC_STATUS_POSITION + crtc_offsets[crtc]);
+
+ if (pos1 != pos2)
+ return true;
+ else
+ return false;
+}
+
/**
* dce4_wait_for_vblank - vblank wait asic callback.
*
@@ -115,21 +136,28 @@ void evergreen_fix_pci_max_read_req_size
*/
void dce4_wait_for_vblank(struct radeon_device *rdev, int crtc)
{
- int i;
+ unsigned i = 0;
if (crtc >= rdev->num_crtc)
return;
- if (RREG32(EVERGREEN_CRTC_CONTROL + crtc_offsets[crtc]) & EVERGREEN_CRTC_MASTER_EN) {
- for (i = 0; i < rdev->usec_timeout; i++) {
- if (!(RREG32(EVERGREEN_CRTC_STATUS + crtc_offsets[crtc]) & EVERGREEN_CRTC_V_BLANK))
+ if (!(RREG32(EVERGREEN_CRTC_CONTROL + crtc_offsets[crtc]) & EVERGREEN_CRTC_MASTER_EN))
+ return;
+
+ /* depending on when we hit vblank, we may be close to active; if so,
+ * wait for another frame.
+ */
+ while (dce4_is_in_vblank(rdev, crtc)) {
+ if (i++ % 100 == 0) {
+ if (!dce4_is_counter_moving(rdev, crtc))
break;
- udelay(1);
}
- for (i = 0; i < rdev->usec_timeout; i++) {
- if (RREG32(EVERGREEN_CRTC_STATUS + crtc_offsets[crtc]) & EVERGREEN_CRTC_V_BLANK)
+ }
+
+ while (!dce4_is_in_vblank(rdev, crtc)) {
+ if (i++ % 100 == 0) {
+ if (!dce4_is_counter_moving(rdev, crtc))
break;
- udelay(1);
}
}
}
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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