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Subject[PATCH] drm: fix to radeon driver for HD 6450
Date
From: Christopher Staite <chris@yourdreamnet.co.uk>

Fix commit 62444b7462a2b98bc78d68736c03a7c4e66ba7e2 for HD 6450. The stop and resume causes the screen to glitch and the X server to reboot constantly. Re-instating the UPDATE_LOCK fixes the issue in tests on the v3.6.11 stable, and the code has not been altered to fix this since.

Signed-off-by: Christopher Staite <chris@yourdreamnet.co.uk>



--- drivers/gpu/drm/radeon/evergreen.c.org 2013-01-25 17:45:06.000000000 +0000
+++ drivers/gpu/drm/radeon/evergreen.c 2013-01-25 17:48:14.000000000 +0000
@@ -1320,7 +1320,9 @@ void evergreen_mc_stop(struct radeon_dev
if (!(tmp & EVERGREEN_CRTC_DISP_READ_REQUEST_DISABLE)) {
radeon_wait_for_vblank(rdev, i);
tmp |= EVERGREEN_CRTC_DISP_READ_REQUEST_DISABLE;
+ WREG32(EVERGREEN_CRTC_UPDATE_LOCK + crtc_offsets[i], 1);
WREG32(EVERGREEN_CRTC_CONTROL + crtc_offsets[i], tmp);
+ WREG32(EVERGREEN_CRTC_UPDATE_LOCK + crtc_offsets[i], 0);
}
}
/* wait for the next frame */
@@ -1382,7 +1384,9 @@ void evergreen_mc_resume(struct radeon_d
} else {
tmp = RREG32(EVERGREEN_CRTC_CONTROL + crtc_offsets[i]);
tmp &= ~EVERGREEN_CRTC_DISP_READ_REQUEST_DISABLE;
+ WREG32(EVERGREEN_CRTC_UPDATE_LOCK + crtc_offsets[i], 1);
WREG32(EVERGREEN_CRTC_CONTROL + crtc_offsets[i], tmp);
+ WREG32(EVERGREEN_CRTC_UPDATE_LOCK + crtc_offsets[i], 0);
}
/* wait for the next frame */
frame_count = radeon_get_vblank_counter(rdev, i);
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