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drm/amdgpu/dce8: optimize pageflip 

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>
hifive-unleashed-5.1
Alex Deucher 2015-10-22 14:08:35 -04:00
parent ed885b2107
commit 82326860b3
1 changed files with 7 additions and 31 deletions
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38
drivers/gpu/drm/amd/amdgpu/dce_v8_0.c
View File

@ -211,46 +211,22 @@ static u32 dce_v8_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_v8_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 |= GRPH_UPDATE__GRPH_UPDATE_LOCK_MASK;
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,
(u32)crtc_base);
/* update the primary scanout addresses */
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,
(u32)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 &= ~GRPH_UPDATE__GRPH_UPDATE_LOCK_MASK;
WREG32(mmGRPH_UPDATE + amdgpu_crtc->crtc_offset, tmp);
lower_32_bits(crtc_base));
/* post the write */
RREG32(mmGRPH_PRIMARY_SURFACE_ADDRESS + amdgpu_crtc->crtc_offset);
}
static int dce_v8_0_crtc_get_scanoutpos(struct amdgpu_device *adev, int crtc,