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drm/panfrost: Fix possible suspend in panfrost_remove 

Calls to panfrost_device_fini() access the h/w, but we already done a
pm_runtime_put_sync_autosuspend() beforehand. This only works if the
autosuspend delay is long enough. A 0ms delay will hang the system when
removing the device. Fix this by moving the pm_runtime_put_sync_suspend()
after the panfrost_device_fini() call.

Cc: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Steven Price <steven.price@arm.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190823021216.5862-2-robh@kernel.org
alistair/sunxi64-5.4-dsi
Rob Herring 2019-08-22 21:12:09 -05:00
parent c90f30812a
commit aebe8c22a9
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/panfrost/panfrost_drv.c
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@ -570,11 +570,13 @@ static int panfrost_remove(struct platform_device *pdev)
drm_dev_unregister(ddev);
panfrost_gem_shrinker_cleanup(ddev);
pm_runtime_get_sync(pfdev->dev);
pm_runtime_put_sync_autosuspend(pfdev->dev);
pm_runtime_disable(pfdev->dev);
panfrost_devfreq_fini(pfdev);
panfrost_device_fini(pfdev);
pm_runtime_put_sync_suspend(pfdev->dev);
pm_runtime_disable(pfdev->dev);
drm_dev_put(ddev);
return 0;
}