drm/radeon/dce4+: optimize pageflip (v2)
Taking the grph update lock is only necessary when
updating the the secondary address (for single pipe stereo).
v2: fix comment as per Michel's suggestion
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 0acde19..7f33767 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -1404,44 +1404,20 @@
* @crtc_id: crtc to cleanup pageflip on
* @crtc_base: new address of the crtc (GPU MC address)
*
- * Does the actual pageflip (evergreen+).
- * During vblank we take the crtc lock and wait for the update_pending
- * bit to go high, when it does, we release the lock, and allow the
- * double buffered update to take place.
- * Returns the current update pending status.
+ * Triggers the actual pageflip by updating the primary
+ * surface base address (evergreen+).
*/
void evergreen_page_flip(struct radeon_device *rdev, int crtc_id, u64 crtc_base)
{
struct radeon_crtc *radeon_crtc = rdev->mode_info.crtcs[crtc_id];
- u32 tmp = RREG32(EVERGREEN_GRPH_UPDATE + radeon_crtc->crtc_offset);
- int i;
-
- /* Lock the graphics update lock */
- tmp |= EVERGREEN_GRPH_UPDATE_LOCK;
- WREG32(EVERGREEN_GRPH_UPDATE + radeon_crtc->crtc_offset, tmp);
/* update the scanout addresses */
- WREG32(EVERGREEN_GRPH_SECONDARY_SURFACE_ADDRESS_HIGH + radeon_crtc->crtc_offset,
- upper_32_bits(crtc_base));
- WREG32(EVERGREEN_GRPH_SECONDARY_SURFACE_ADDRESS + radeon_crtc->crtc_offset,
- (u32)crtc_base);
-
WREG32(EVERGREEN_GRPH_PRIMARY_SURFACE_ADDRESS_HIGH + radeon_crtc->crtc_offset,
upper_32_bits(crtc_base));
WREG32(EVERGREEN_GRPH_PRIMARY_SURFACE_ADDRESS + radeon_crtc->crtc_offset,
(u32)crtc_base);
-
- /* Wait for update_pending to go high. */
- for (i = 0; i < rdev->usec_timeout; i++) {
- if (RREG32(EVERGREEN_GRPH_UPDATE + radeon_crtc->crtc_offset) & EVERGREEN_GRPH_SURFACE_UPDATE_PENDING)
- break;
- udelay(1);
- }
- DRM_DEBUG("Update pending now high. Unlocking vupdate_lock.\n");
-
- /* Unlock the lock, so double-buffering can take place inside vblank */
- tmp &= ~EVERGREEN_GRPH_UPDATE_LOCK;
- WREG32(EVERGREEN_GRPH_UPDATE + radeon_crtc->crtc_offset, tmp);
+ /* post the write */
+ RREG32(EVERGREEN_GRPH_PRIMARY_SURFACE_ADDRESS + radeon_crtc->crtc_offset);
}
/**