From 0eaaacab038ec03c010cd820554cfa6d1a93cd78 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Thu, 22 Oct 2015 14:16:57 -0400 Subject: [PATCH] drm/amdgpu/dce10: optimize pageflip MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 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 Reviewed-by: Jammy Zhou Signed-off-by: Alex Deucher --- 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 a6ea2d8e85df..61320511c479 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, -- 2.39.5