On Thu, Jul 7, 2022 at 9:11 AM Akhil P Oommen <quic_akhilpo@xxxxxxxxxxx> wrote: > > There are some hardware logic under CX domain. For a successful > recovery, we should ensure cx headswitch collapses to ensure all the > stale states are cleard out. This is especially true to for a6xx family > where we can GMU co-processor. > > Currently, cx doesn't collapse due to a devlink between gpu and its > smmu. So the *struct gpu device* needs to be runtime suspended to ensure > that the iommu driver removes its vote on cx gdsc. > > Signed-off-by: Akhil P Oommen <quic_akhilpo@xxxxxxxxxxx> > --- > > drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 16 ++++++++++++++-- > drivers/gpu/drm/msm/msm_gpu.c | 2 -- > 2 files changed, 14 insertions(+), 4 deletions(-) > > diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c > index 42ed9a3..57a7ad5 100644 > --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c > +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c > @@ -1210,8 +1210,20 @@ static void a6xx_recover(struct msm_gpu *gpu) > */ > gmu_write(&a6xx_gpu->gmu, REG_A6XX_GMU_GMU_PWR_COL_KEEPALIVE, 0); > > - gpu->funcs->pm_suspend(gpu); > - gpu->funcs->pm_resume(gpu); > + /* > + * Now drop all the pm_runtime usage count to allow cx gdsc to collapse. > + * First drop the usage count from all active submits > + */ > + for (i = gpu->active_submits; i > 0; i--) > + pm_runtime_put(&gpu->pdev->dev); Would pm_runtime_force_suspend/resume() work instead? BR, -R > + > + /* And the final one from recover worker */ > + pm_runtime_put_sync(&gpu->pdev->dev); > + > + for (i = gpu->active_submits; i > 0; i--) > + pm_runtime_get(&gpu->pdev->dev); > + > + pm_runtime_get_sync(&gpu->pdev->dev); > > msm_gpu_hw_init(gpu); > } > diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c > index f75ff4b..48171b6 100644 > --- a/drivers/gpu/drm/msm/msm_gpu.c > +++ b/drivers/gpu/drm/msm/msm_gpu.c > @@ -444,9 +444,7 @@ static void recover_worker(struct kthread_work *work) > /* retire completed submits, plus the one that hung: */ > retire_submits(gpu); > > - pm_runtime_get_sync(&gpu->pdev->dev); > gpu->funcs->recover(gpu); > - pm_runtime_put_sync(&gpu->pdev->dev); > > /* > * Replay all remaining submits starting with highest priority > -- > 2.7.4 >
