mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 09:12:39 +00:00
011f2c26f1
As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
79 lines
2.8 KiB
Diff
79 lines
2.8 KiB
Diff
From 5163dcd743642b47a6f82ced6dd110a669984359 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
|
|
@@ -86,21 +86,24 @@ 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
|
|
@@ -728,8 +728,10 @@ vc4_complete_exec(struct drm_device *dev
|
|
mutex_unlock(&dev->struct_mutex);
|
|
|
|
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;
|