From 71338cb4a7c2b519227e9d103fbb6e42eebcb705 Mon Sep 17 00:00:00 2001 From: Bhawanpreet Lakha Date: Thu, 30 Jul 2020 17:03:49 -0400 Subject: [PATCH] drm/amd/display: enable idle optimizations for linux (MALL stutter) [Why] We can only use this feature when the display is idle. When active vblank irq count is 0 we know all the displays are idle. [How] -Add a active vblank irq counter -Update the counter when we enable/disable vblank irq -if vblank irq count is 0 we can consider mall stutter Signed-off-by: Bhawanpreet Lakha Acked-by: Alex Deucher Reviewed-by: Nick Kazlauskas Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 21 ++++++++++++++++++++- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 7 +++++++ 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 419d089ad00e..98f6f7e86353 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -5413,6 +5413,7 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable) struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc); struct amdgpu_device *adev = drm_to_adev(crtc->dev); struct dm_crtc_state *acrtc_state = to_dm_crtc_state(crtc->state); + struct amdgpu_display_manager *dm = &adev->dm; int rc = 0; if (enable) { @@ -5428,7 +5429,25 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable) return rc; irq_source = IRQ_TYPE_VBLANK + acrtc->otg_inst; - return dc_interrupt_set(adev->dm.dc, irq_source, enable) ? 0 : -EBUSY; + + if (!dc_interrupt_set(adev->dm.dc, irq_source, enable)) + return -EBUSY; + + mutex_lock(&dm->dc_lock); + + if (enable) + dm->active_vblank_irq_count++; + else + dm->active_vblank_irq_count--; + + dc_allow_idle_optimizations( + adev->dm.dc, dm->active_vblank_irq_count == 0 ? true : false); + + DRM_DEBUG_DRIVER("Allow idle optimizations (MALL): %d\n", dm->active_vblank_irq_count == 0); + + mutex_unlock(&dm->dc_lock); + + return 0; } static int dm_enable_vblank(struct drm_crtc *crtc) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h index 2ee6edb3df93..f084e2fc9569 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h @@ -336,6 +336,13 @@ struct amdgpu_display_manager { */ const struct gpu_info_soc_bounding_box_v1_0 *soc_bounding_box; + /** + * @active_vblank_irq_count + * + * number of currently active vblank irqs + */ + uint32_t active_vblank_irq_count; + #ifdef CONFIG_DEBUG_FS /** * @crc_win_x_start_property: -- 2.11.0