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From 0eaaacab038ec03c010cd820554cfa6d1a93cd78 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 22 Oct 2015 14:16:57 -0400
Subject: [PATCH 0642/1565] drm/amdgpu/dce10: optimize pageflip
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Taking the grph update lock is only necessary when
updating the the secondary address (for single pipe stereo).
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/amdgpu/dce_v10_0.c | 36 ++++++----------------------------
1 file changed, 6 insertions(+), 30 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
index a6ea2d8..6132051 100644
--- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
@@ -262,46 +262,22 @@ static u32 dce_v10_0_vblank_get_counter(struct amdgpu_device *adev, int crtc)
* @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.
*/
static void dce_v10_0_page_flip(struct amdgpu_device *adev,
int crtc_id, u64 crtc_base)
{
struct amdgpu_crtc *amdgpu_crtc = adev->mode_info.crtcs[crtc_id];
- u32 tmp = RREG32(mmGRPH_UPDATE + amdgpu_crtc->crtc_offset);
- int i;
-
- /* Lock the graphics update lock */
- tmp = REG_SET_FIELD(tmp, GRPH_UPDATE, GRPH_UPDATE_LOCK, 1);
- WREG32(mmGRPH_UPDATE + amdgpu_crtc->crtc_offset, tmp);
-
- /* update the scanout addresses */
- WREG32(mmGRPH_SECONDARY_SURFACE_ADDRESS_HIGH + amdgpu_crtc->crtc_offset,
- upper_32_bits(crtc_base));
- WREG32(mmGRPH_SECONDARY_SURFACE_ADDRESS + amdgpu_crtc->crtc_offset,
- lower_32_bits(crtc_base));
+ /* update the primary scanout address */
WREG32(mmGRPH_PRIMARY_SURFACE_ADDRESS_HIGH + amdgpu_crtc->crtc_offset,
upper_32_bits(crtc_base));
+ /* writing to the low address triggers the update */
WREG32(mmGRPH_PRIMARY_SURFACE_ADDRESS + amdgpu_crtc->crtc_offset,
lower_32_bits(crtc_base));
-
- /* Wait for update_pending to go high. */
- for (i = 0; i < adev->usec_timeout; i++) {
- if (RREG32(mmGRPH_UPDATE + amdgpu_crtc->crtc_offset) &
- GRPH_UPDATE__GRPH_SURFACE_UPDATE_PENDING_MASK)
- 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 = REG_SET_FIELD(tmp, GRPH_UPDATE, GRPH_UPDATE_LOCK, 0);
- WREG32(mmGRPH_UPDATE + amdgpu_crtc->crtc_offset, tmp);
+ /* post the write */
+ RREG32(mmGRPH_PRIMARY_SURFACE_ADDRESS + amdgpu_crtc->crtc_offset);
}
static int dce_v10_0_crtc_get_scanoutpos(struct amdgpu_device *adev, int crtc,
--
1.9.1
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