diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.9/950-0164-drm-vc4-Use-runtime-autosuspend-to-avoid-thrashing-V.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.9/950-0164-drm-vc4-Use-runtime-autosuspend-to-avoid-thrashing-V.patch | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/target/linux/brcm2708/patches-4.9/950-0164-drm-vc4-Use-runtime-autosuspend-to-avoid-thrashing-V.patch b/target/linux/brcm2708/patches-4.9/950-0164-drm-vc4-Use-runtime-autosuspend-to-avoid-thrashing-V.patch deleted file mode 100644 index f6d738d941..0000000000 --- a/target/linux/brcm2708/patches-4.9/950-0164-drm-vc4-Use-runtime-autosuspend-to-avoid-thrashing-V.patch +++ /dev/null @@ -1,78 +0,0 @@ -From 936dc8b00ccd5072c5d610b97199402275bfdf26 Mon Sep 17 00:00:00 2001 -From: Eric Anholt <eric@anholt.net> -Date: Fri, 4 Nov 2016 15:58:38 -0700 -Subject: [PATCH] drm/vc4: Use runtime autosuspend to avoid thrashing V3D power - state. - -The pm_runtime_put() we were using immediately released power on the -device, which meant that we were generally turning the device off and -on once per frame. In many profiles I've looked at, that added up to -about 1% of CPU time, but this could get worse in the case of frequent -rendering and readback (as may happen in X rendering). By keeping the -device on until we've been idle for a couple of frames, we drop the -overhead of runtime PM down to sub-.1%. - -Signed-off-by: Eric Anholt <eric@anholt.net> -(cherry picked from commit 3a62234680d86efa0239665ed8a0e908f1aef147) ---- - drivers/gpu/drm/vc4/vc4_drv.c | 9 ++++++--- - drivers/gpu/drm/vc4/vc4_gem.c | 6 ++++-- - drivers/gpu/drm/vc4/vc4_v3d.c | 2 ++ - 3 files changed, 12 insertions(+), 5 deletions(-) - ---- a/drivers/gpu/drm/vc4/vc4_drv.c -+++ b/drivers/gpu/drm/vc4/vc4_drv.c -@@ -61,21 +61,24 @@ static int vc4_get_param_ioctl(struct dr - if (ret < 0) - return ret; - args->value = V3D_READ(V3D_IDENT0); -- pm_runtime_put(&vc4->v3d->pdev->dev); -+ pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev); -+ pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev); - break; - case DRM_VC4_PARAM_V3D_IDENT1: - ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev); - if (ret < 0) - return ret; - args->value = V3D_READ(V3D_IDENT1); -- pm_runtime_put(&vc4->v3d->pdev->dev); -+ pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev); -+ pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev); - break; - case DRM_VC4_PARAM_V3D_IDENT2: - ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev); - if (ret < 0) - return ret; - args->value = V3D_READ(V3D_IDENT2); -- pm_runtime_put(&vc4->v3d->pdev->dev); -+ pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev); -+ pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev); - break; - case DRM_VC4_PARAM_SUPPORTS_BRANCHES: - case DRM_VC4_PARAM_SUPPORTS_ETC1: ---- a/drivers/gpu/drm/vc4/vc4_gem.c -+++ b/drivers/gpu/drm/vc4/vc4_gem.c -@@ -711,8 +711,10 @@ vc4_complete_exec(struct drm_device *dev - } - - mutex_lock(&vc4->power_lock); -- if (--vc4->power_refcount == 0) -- pm_runtime_put(&vc4->v3d->pdev->dev); -+ if (--vc4->power_refcount == 0) { -+ pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev); -+ pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev); -+ } - mutex_unlock(&vc4->power_lock); - - kfree(exec); ---- a/drivers/gpu/drm/vc4/vc4_v3d.c -+++ b/drivers/gpu/drm/vc4/vc4_v3d.c -@@ -222,6 +222,8 @@ static int vc4_v3d_bind(struct device *d - return ret; - } - -+ pm_runtime_use_autosuspend(dev); -+ pm_runtime_set_autosuspend_delay(dev, 40); /* a little over 2 frames. */ - pm_runtime_enable(dev); - - return 0; |