diff options
| author | Alex Deucher <alexander.deucher@amd.com> | 2015-10-22 14:08:35 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2015-10-23 12:51:23 -0400 |
| commit | 82326860b3ee58db33536a3e29675e28603f661c (patch) | |
| tree | d0de39313e2043fe4725bdce485511ca6860eb60 /drivers/gpu/drm/amd/amdgpu/dce_v8_0.c | |
| parent | ed885b210752563b5e90dc0933e262f768ea9fa4 (diff) | |
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>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/dce_v8_0.c')
| -rw-r--r-- | drivers/gpu/drm/amd/amdgpu/dce_v8_0.c | 38 |
1 files changed, 7 insertions, 31 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c index 00c34f87ac20..b17abbe1be99 100644 --- a/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c +++ b/drivers/gpu/drm/amd/amdgpu/dce_v8_0.c @@ -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, |