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authorDouglas Anderson <dianders@chromium.org>2023-09-02 02:39:53 +0300
committerDouglas Anderson <dianders@chromium.org>2023-09-21 20:41:04 +0300
commitce3d99c8349584bc0fbe1e21918a3ea1155343aa (patch)
tree4140820496f6696cf4b4487a4ea612cb831229b1 /drivers/gpu/drm/omapdrm
parentc478768ce80772e932f246d9ce0378f2a6b7cfeb (diff)
downloadlinux-ce3d99c8349584bc0fbe1e21918a3ea1155343aa.tar.xz
drm: Call drm_atomic_helper_shutdown() at shutdown time for misc drivers
Based on grepping through the source code these drivers appear to be missing a call to drm_atomic_helper_shutdown() at system shutdown time. Among other things, this means that if a panel is in use that it won't be cleanly powered off at system shutdown time. The fact that we should call drm_atomic_helper_shutdown() in the case of OS shutdown/restart comes straight out of the kernel doc "driver instance overview" in drm_drv.c. All of the drivers in this patch were fairly straightforward to fix since they already had a call to drm_atomic_helper_shutdown() at remove/unbind time but were just lacking one at system shutdown. The only hitch is that some of these drivers use the component model to register/unregister their DRM devices. The shutdown callback is part of the original device. The typical solution here, based on how other DRM drivers do this, is to keep track of whether the device is bound based on drvdata. In most cases the drvdata is the drm_device, so we can just make sure it is NULL when the device is not bound. In some drivers, this required minor code changes. To make things simpler, drm_atomic_helper_shutdown() has been modified to consider a NULL drm_device as a noop in the patch ("drm/atomic-helper: drm_atomic_helper_shutdown(NULL) should be a noop"). Suggested-by: Maxime Ripard <mripard@kernel.org> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Tested-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Acked-by: Maxime Ripard <mripard@kernel.org> Tested-by: Jernej Skrabec <jernej.skrabec@gmail.com> Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com> Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn> Tested-by: Sui Jingfeng <suijingfeng@loongson.cn> Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/20230901163944.RFT.2.I9115e5d094a43e687978b0699cc1fe9f2a3452ea@changeid
Diffstat (limited to 'drivers/gpu/drm/omapdrm')
-rw-r--r--drivers/gpu/drm/omapdrm/omap_drv.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index afeeb7737552..b2835b3ea6f5 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -817,6 +817,13 @@ static void pdev_remove(struct platform_device *pdev)
kfree(priv);
}
+static void pdev_shutdown(struct platform_device *pdev)
+{
+ struct omap_drm_private *priv = platform_get_drvdata(pdev);
+
+ drm_atomic_helper_shutdown(priv->ddev);
+}
+
#ifdef CONFIG_PM_SLEEP
static int omap_drm_suspend(struct device *dev)
{
@@ -846,6 +853,7 @@ static struct platform_driver pdev = {
},
.probe = pdev_probe,
.remove_new = pdev_remove,
+ .shutdown = pdev_shutdown,
};
static struct platform_driver * const drivers[] = {