[RFT PATCH 2/6] drm: Call drm_atomic_helper_shutdown() at shutdown time for misc drivers

[RFT PATCH 2/6] drm: Call drm_atomic_helper_shutdown() at shutdown time for misc drivers

[Douglas Anderson]

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>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---
This commit is only compile-time tested.

Note that checkpatch yells that "drivers/gpu/drm/tiny/cirrus.c" is
marked as 'obsolete', but it seems silly not to include the fix if
it's already been written. If someone wants me to take that out,
though, I can.

 drivers/gpu/drm/arm/display/komeda/komeda_drv.c | 9 +++++++++
 drivers/gpu/drm/arm/display/komeda/komeda_kms.c | 7 +++++++
 drivers/gpu/drm/arm/display/komeda/komeda_kms.h | 1 +
 drivers/gpu/drm/arm/hdlcd_drv.c                 | 6 ++++++
 drivers/gpu/drm/arm/malidp_drv.c                | 6 ++++++
 drivers/gpu/drm/ast/ast_drv.c                   | 6 ++++++
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c    | 6 ++++++
 drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c       | 8 ++++++++
 drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 6 ++++++
 drivers/gpu/drm/hyperv/hyperv_drm_drv.c         | 6 ++++++
 drivers/gpu/drm/logicvc/logicvc_drm.c           | 9 +++++++++
 drivers/gpu/drm/loongson/lsdc_drv.c             | 6 ++++++
 drivers/gpu/drm/mcde/mcde_drv.c                 | 9 +++++++++
 drivers/gpu/drm/omapdrm/omap_drv.c              | 8 ++++++++
 drivers/gpu/drm/qxl/qxl_drv.c                   | 7 +++++++
 drivers/gpu/drm/sti/sti_drv.c                   | 7 +++++++
 drivers/gpu/drm/sun4i/sun4i_drv.c               | 6 ++++++
 drivers/gpu/drm/tiny/bochs.c                    | 6 ++++++
 drivers/gpu/drm/tiny/cirrus.c                   | 6 ++++++
 19 files changed, 125 insertions(+)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
index cb2a2be24c5f..cc57ea4e13ae 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
@@ -45,6 +45,14 @@ static void komeda_platform_remove(struct platform_device *pdev)
 	devm_kfree(dev, mdrv);
 }
 
+static void komeda_platform_shutdown(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct komeda_drv *mdrv = dev_get_drvdata(dev);
+
+	komeda_kms_shutdown(mdrv->kms);
+}
+
 static int komeda_platform_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -142,6 +150,7 @@ static const struct dev_pm_ops komeda_pm_ops = {
 static struct platform_driver komeda_platform_driver = {
 	.probe	= komeda_platform_probe,
 	.remove_new = komeda_platform_remove,
+	.shutdown = komeda_platform_shutdown,
 	.driver	= {
 		.name = "komeda",
 		.of_match_table	= komeda_of_match,
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
index 9299026701f3..fe46b0ebefea 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
@@ -340,3 +340,10 @@ void komeda_kms_detach(struct komeda_kms_dev *kms)
 	komeda_kms_cleanup_private_objs(kms);
 	drm->dev_private = NULL;
 }
+
+void komeda_kms_shutdown(struct komeda_kms_dev *kms)
+{
+	struct drm_device *drm = &kms->base;
+
+	drm_atomic_helper_shutdown(drm);
+}
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
index 6ef655326357..a4048724564d 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
@@ -190,5 +190,6 @@ void komeda_crtc_flush_and_wait_for_flip_done(struct komeda_crtc *kcrtc,
 
 struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev);
 void komeda_kms_detach(struct komeda_kms_dev *kms);
+void komeda_kms_shutdown(struct komeda_kms_dev *kms);
 
 #endif /*_KOMEDA_KMS_H_*/
diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
index aa06f9838015..32be9e370049 100644
--- a/drivers/gpu/drm/arm/hdlcd_drv.c
+++ b/drivers/gpu/drm/arm/hdlcd_drv.c
@@ -372,6 +372,11 @@ static void hdlcd_remove(struct platform_device *pdev)
 	component_master_del(&pdev->dev, &hdlcd_master_ops);
 }
 
+static void hdlcd_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
+}
+
 static const struct of_device_id  hdlcd_of_match[] = {
 	{ .compatible	= "arm,hdlcd" },
 	{},
@@ -399,6 +404,7 @@ static SIMPLE_DEV_PM_OPS(hdlcd_pm_ops, hdlcd_pm_suspend, hdlcd_pm_resume);
 static struct platform_driver hdlcd_platform_driver = {
 	.probe		= hdlcd_probe,
 	.remove_new	= hdlcd_remove,
+	.shutdown	= hdlcd_shutdown,
 	.driver	= {
 		.name = "hdlcd",
 		.pm = &hdlcd_pm_ops,
diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
index 62329d5dd992..6682131d2910 100644
--- a/drivers/gpu/drm/arm/malidp_drv.c
+++ b/drivers/gpu/drm/arm/malidp_drv.c
@@ -941,6 +941,11 @@ static void malidp_platform_remove(struct platform_device *pdev)
 	component_master_del(&pdev->dev, &malidp_master_ops);
 }
 
+static void malidp_platform_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
+}
+
 static int __maybe_unused malidp_pm_suspend(struct device *dev)
 {
 	struct drm_device *drm = dev_get_drvdata(dev);
@@ -982,6 +987,7 @@ static const struct dev_pm_ops malidp_pm_ops = {
 static struct platform_driver malidp_platform_driver = {
 	.probe		= malidp_platform_probe,
 	.remove_new	= malidp_platform_remove,
+	.shutdown	= malidp_platform_shutdown,
 	.driver	= {
 		.name = "mali-dp",
 		.pm = &malidp_pm_ops,
diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
index e1224ef4ad83..cf5b754f044c 100644
--- a/drivers/gpu/drm/ast/ast_drv.c
+++ b/drivers/gpu/drm/ast/ast_drv.c
@@ -125,6 +125,11 @@ static void ast_pci_remove(struct pci_dev *pdev)
 	drm_atomic_helper_shutdown(dev);
 }
 
+static void ast_pci_shutdown(struct pci_dev *pdev)
+{
+	drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
+}
+
 static int ast_drm_freeze(struct drm_device *dev)
 {
 	int error;
@@ -209,6 +214,7 @@ static struct pci_driver ast_pci_driver = {
 	.id_table = ast_pciidlist,
 	.probe = ast_pci_probe,
 	.remove = ast_pci_remove,
+	.shutdown = ast_pci_shutdown,
 	.driver.pm = &ast_pm_ops,
 };
 
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
index fa0f9a93d50d..84c54e8622d1 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -782,6 +782,11 @@ static void atmel_hlcdc_dc_drm_remove(struct platform_device *pdev)
 	drm_dev_put(ddev);
 }
 
+static void atmel_hlcdc_dc_drm_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
+}
+
 static int atmel_hlcdc_dc_drm_suspend(struct device *dev)
 {
 	struct drm_device *drm_dev = dev_get_drvdata(dev);
@@ -825,6 +830,7 @@ static const struct of_device_id atmel_hlcdc_dc_of_match[] = {
 static struct platform_driver atmel_hlcdc_dc_platform_driver = {
 	.probe	= atmel_hlcdc_dc_drm_probe,
 	.remove_new = atmel_hlcdc_dc_drm_remove,
+	.shutdown = atmel_hlcdc_dc_drm_shutdown,
 	.driver	= {
 		.name	= "atmel-hlcdc-display-controller",
 		.pm	= pm_sleep_ptr(&atmel_hlcdc_dc_drm_pm_ops),
diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
index a395f93449f3..ab6c0c6cd0e2 100644
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -356,9 +356,17 @@ static void fsl_dcu_drm_remove(struct platform_device *pdev)
 	clk_unregister(fsl_dev->pix_clk);
 }
 
+static void fsl_dcu_drm_shutdown(struct platform_device *pdev)
+{
+	struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
+
+	drm_atomic_helper_shutdown(fsl_dev->drm);
+}
+
 static struct platform_driver fsl_dcu_drm_platform_driver = {
 	.probe		= fsl_dcu_drm_probe,
 	.remove_new	= fsl_dcu_drm_remove,
+	.shutdown	= fsl_dcu_drm_shutdown,
 	.driver		= {
 		.name	= "fsl-dcu",
 		.pm	= &fsl_dcu_drm_pm_ops,
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
index 8a98fa276e8a..57c21ec452b7 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
@@ -357,6 +357,11 @@ static void hibmc_pci_remove(struct pci_dev *pdev)
 	hibmc_unload(dev);
 }
 
+static void hibmc_pci_shutdown(struct pci_dev *pdev)
+{
+	drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
+}
+
 static const struct pci_device_id hibmc_pci_table[] = {
 	{ PCI_VDEVICE(HUAWEI, 0x1711) },
 	{0,}
@@ -367,6 +372,7 @@ static struct pci_driver hibmc_pci_driver = {
 	.id_table =	hibmc_pci_table,
 	.probe =	hibmc_pci_probe,
 	.remove =	hibmc_pci_remove,
+	.shutdown =	hibmc_pci_shutdown,
 	.driver.pm =    &hibmc_pm_ops,
 };
 
diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_drv.c b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
index 8026118c6e03..58b0b46a21e6 100644
--- a/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
+++ b/drivers/gpu/drm/hyperv/hyperv_drm_drv.c
@@ -178,6 +178,11 @@ static void hyperv_vmbus_remove(struct hv_device *hdev)
 	vmbus_free_mmio(hv->mem->start, hv->fb_size);
 }
 
+static void hyperv_vmbus_shutdown(struct hv_device *hdev)
+{
+	drm_atomic_helper_shutdown(hv_get_drvdata(hdev));
+}
+
 static int hyperv_vmbus_suspend(struct hv_device *hdev)
 {
 	struct drm_device *dev = hv_get_drvdata(hdev);
@@ -220,6 +225,7 @@ static struct hv_driver hyperv_hv_driver = {
 	.id_table = hyperv_vmbus_tbl,
 	.probe = hyperv_vmbus_probe,
 	.remove = hyperv_vmbus_remove,
+	.shutdown = hyperv_vmbus_shutdown,
 	.suspend = hyperv_vmbus_suspend,
 	.resume = hyperv_vmbus_resume,
 	.driver = {
diff --git a/drivers/gpu/drm/logicvc/logicvc_drm.c b/drivers/gpu/drm/logicvc/logicvc_drm.c
index 749debd3d6a5..01a37e28c080 100644
--- a/drivers/gpu/drm/logicvc/logicvc_drm.c
+++ b/drivers/gpu/drm/logicvc/logicvc_drm.c
@@ -482,6 +482,14 @@ static void logicvc_drm_remove(struct platform_device *pdev)
 	of_reserved_mem_device_release(dev);
 }
 
+static void logicvc_drm_shutdown(struct platform_device *pdev)
+{
+	struct logicvc_drm *logicvc = platform_get_drvdata(pdev);
+	struct drm_device *drm_dev = &logicvc->drm_dev;
+
+	drm_atomic_helper_shutdown(drm_dev);
+}
+
 static const struct of_device_id logicvc_drm_of_table[] = {
 	{ .compatible = "xylon,logicvc-3.02.a-display" },
 	{ .compatible = "xylon,logicvc-4.01.a-display" },
@@ -492,6 +500,7 @@ MODULE_DEVICE_TABLE(of, logicvc_drm_of_table);
 static struct platform_driver logicvc_drm_platform_driver = {
 	.probe		= logicvc_drm_probe,
 	.remove_new	= logicvc_drm_remove,
+	.shutdown	= logicvc_drm_shutdown,
 	.driver		= {
 		.name		= "logicvc-drm",
 		.of_match_table	= logicvc_drm_of_table,
diff --git a/drivers/gpu/drm/loongson/lsdc_drv.c b/drivers/gpu/drm/loongson/lsdc_drv.c
index 188ec82afcfb..89ccc0c43169 100644
--- a/drivers/gpu/drm/loongson/lsdc_drv.c
+++ b/drivers/gpu/drm/loongson/lsdc_drv.c
@@ -327,6 +327,11 @@ static void lsdc_pci_remove(struct pci_dev *pdev)
 	drm_atomic_helper_shutdown(ddev);
 }
 
+static void lsdc_pci_shutdown(struct pci_dev *pdev)
+{
+	drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
+}
+
 static int lsdc_drm_freeze(struct drm_device *ddev)
 {
 	struct lsdc_device *ldev = to_lsdc(ddev);
@@ -447,6 +452,7 @@ struct pci_driver lsdc_pci_driver = {
 	.id_table = lsdc_pciid_list,
 	.probe = lsdc_pci_probe,
 	.remove = lsdc_pci_remove,
+	.shutdown = lsdc_pci_shutdown,
 	.driver.pm = &lsdc_pm_ops,
 };
 
diff --git a/drivers/gpu/drm/mcde/mcde_drv.c b/drivers/gpu/drm/mcde/mcde_drv.c
index a2572fb311f0..10c06440c7e7 100644
--- a/drivers/gpu/drm/mcde/mcde_drv.c
+++ b/drivers/gpu/drm/mcde/mcde_drv.c
@@ -459,6 +459,14 @@ static void mcde_remove(struct platform_device *pdev)
 	regulator_disable(mcde->epod);
 }
 
+static void mcde_shutdown(struct platform_device *pdev)
+{
+	struct drm_device *drm = platform_get_drvdata(pdev);
+
+	if (drm->registered)
+		drm_atomic_helper_shutdown(drm);
+}
+
 static const struct of_device_id mcde_of_match[] = {
 	{
 		.compatible = "ste,mcde",
@@ -473,6 +481,7 @@ static struct platform_driver mcde_driver = {
 	},
 	.probe = mcde_probe,
 	.remove_new = mcde_remove,
+	.shutdown = mcde_shutdown,
 };
 
 static struct platform_driver *const component_drivers[] = {
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[] = {
diff --git a/drivers/gpu/drm/qxl/qxl_drv.c b/drivers/gpu/drm/qxl/qxl_drv.c
index b30ede1cf62d..a4144c62ca93 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.c
+++ b/drivers/gpu/drm/qxl/qxl_drv.c
@@ -163,6 +163,12 @@ qxl_pci_remove(struct pci_dev *pdev)
 		vga_put(pdev, VGA_RSRC_LEGACY_IO);
 }
 
+static void
+qxl_pci_shutdown(struct pci_dev *pdev)
+{
+	drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
+}
+
 DEFINE_DRM_GEM_FOPS(qxl_fops);
 
 static int qxl_drm_freeze(struct drm_device *dev)
@@ -269,6 +275,7 @@ static struct pci_driver qxl_pci_driver = {
 	 .id_table = pciidlist,
 	 .probe = qxl_pci_probe,
 	 .remove = qxl_pci_remove,
+	 .shutdown = qxl_pci_shutdown,
 	 .driver.pm = &qxl_pm_ops,
 };
 
diff --git a/drivers/gpu/drm/sti/sti_drv.c b/drivers/gpu/drm/sti/sti_drv.c
index 2390c1bb6596..4bab93c4fefd 100644
--- a/drivers/gpu/drm/sti/sti_drv.c
+++ b/drivers/gpu/drm/sti/sti_drv.c
@@ -174,6 +174,7 @@ static void sti_cleanup(struct drm_device *ddev)
 	drm_atomic_helper_shutdown(ddev);
 	drm_mode_config_cleanup(ddev);
 	component_unbind_all(ddev->dev, ddev);
+	dev_set_drvdata(ddev->dev, NULL);
 	kfree(private);
 	ddev->dev_private = NULL;
 }
@@ -253,6 +254,11 @@ static void sti_platform_remove(struct platform_device *pdev)
 	component_master_del(&pdev->dev, &sti_ops);
 }
 
+static void sti_platform_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
+}
+
 static const struct of_device_id sti_dt_ids[] = {
 	{ .compatible = "st,sti-display-subsystem", },
 	{ /* end node */ },
@@ -262,6 +268,7 @@ MODULE_DEVICE_TABLE(of, sti_dt_ids);
 static struct platform_driver sti_platform_driver = {
 	.probe = sti_platform_probe,
 	.remove_new = sti_platform_remove,
+	.shutdown = sti_platform_shutdown,
 	.driver = {
 		.name = DRIVER_NAME,
 		.of_match_table = sti_dt_ids,
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c
index 6a8dfc022d3c..35d7a7ffd208 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -413,6 +413,11 @@ static void sun4i_drv_remove(struct platform_device *pdev)
 	component_master_del(&pdev->dev, &sun4i_drv_master_ops);
 }
 
+static void sun4i_drv_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
+}
+
 static const struct of_device_id sun4i_drv_of_table[] = {
 	{ .compatible = "allwinner,sun4i-a10-display-engine" },
 	{ .compatible = "allwinner,sun5i-a10s-display-engine" },
@@ -437,6 +442,7 @@ MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
 static struct platform_driver sun4i_drv_platform_driver = {
 	.probe		= sun4i_drv_probe,
 	.remove_new	= sun4i_drv_remove,
+	.shutdown	= sun4i_drv_shutdown,
 	.driver		= {
 		.name		= "sun4i-drm",
 		.of_match_table	= sun4i_drv_of_table,
diff --git a/drivers/gpu/drm/tiny/bochs.c b/drivers/gpu/drm/tiny/bochs.c
index d254679a136e..c23c9f0cf49c 100644
--- a/drivers/gpu/drm/tiny/bochs.c
+++ b/drivers/gpu/drm/tiny/bochs.c
@@ -690,6 +690,11 @@ static void bochs_pci_remove(struct pci_dev *pdev)
 	drm_dev_put(dev);
 }
 
+static void bochs_pci_shutdown(struct pci_dev *pdev)
+{
+	drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
+}
+
 static const struct pci_device_id bochs_pci_tbl[] = {
 	{
 		.vendor      = 0x1234,
@@ -720,6 +725,7 @@ static struct pci_driver bochs_pci_driver = {
 	.id_table =	bochs_pci_tbl,
 	.probe =	bochs_pci_probe,
 	.remove =	bochs_pci_remove,
+	.shutdown =	bochs_pci_shutdown,
 	.driver.pm =    &bochs_pm_ops,
 };
 
diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c
index 594bc472862f..c5c34cd2edc1 100644
--- a/drivers/gpu/drm/tiny/cirrus.c
+++ b/drivers/gpu/drm/tiny/cirrus.c
@@ -727,6 +727,11 @@ static void cirrus_pci_remove(struct pci_dev *pdev)
 	drm_atomic_helper_shutdown(dev);
 }
 
+static void cirrus_pci_shutdown(struct pci_dev *pdev)
+{
+	drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
+}
+
 static const struct pci_device_id pciidlist[] = {
 	{
 		.vendor    = PCI_VENDOR_ID_CIRRUS,
@@ -748,6 +753,7 @@ static struct pci_driver cirrus_pci_driver = {
 	.id_table = pciidlist,
 	.probe = cirrus_pci_probe,
 	.remove = cirrus_pci_remove,
+	.shutdown = cirrus_pci_shutdown,
 };
 
 drm_module_pci_driver(cirrus_pci_driver)
-- 
2.42.0.283.g2d96d420d3-goog


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[RFT PATCH 5/6] drm: Call drm_atomic_helper_shutdown() at shutdown/remove time for misc drivers

[Douglas Anderson]

Based on grepping through the source code these drivers appear to be
missing a call to drm_atomic_helper_shutdown() at system shutdown time
and at driver remove (or unbind) 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 and at driver remove (or unbind) time comes
straight out of the kernel doc "driver instance overview" in
drm_drv.c.

A few notes about these fixes:
- I confirmed that these drivers were all DRIVER_MODESET type drivers,
  which I believe makes this relevant.
- I confirmed that these drivers were all DRIVER_ATOMIC.
- When adding drm_atomic_helper_shutdown() to the remove/unbind path,
  I added it after drm_kms_helper_poll_fini() when the driver had
  it. This seemed to be what other drivers did. If
  drm_kms_helper_poll_fini() wasn't there I added it straight after
  drm_dev_unregister().
- This patch deals with drivers using the component model in similar
  ways as the patch ("drm: Call drm_atomic_helper_shutdown() at
  shutdown time for misc drivers")
- These fixes rely on the patch ("drm/atomic-helper:
  drm_atomic_helper_shutdown(NULL) should be a noop") to simplify
  shutdown.

Suggested-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

 drivers/gpu/drm/aspeed/aspeed_gfx_drv.c |  7 +++++++
 drivers/gpu/drm/mgag200/mgag200_drv.c   |  8 ++++++++
 drivers/gpu/drm/pl111/pl111_drv.c       |  7 +++++++
 drivers/gpu/drm/stm/drv.c               |  7 +++++++
 drivers/gpu/drm/tilcdc/tilcdc_drv.c     | 11 ++++++++++-
 drivers/gpu/drm/tve200/tve200_drv.c     |  7 +++++++
 drivers/gpu/drm/vboxvideo/vbox_drv.c    | 10 ++++++++++
 7 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
index d207b03f8357..78122b35a0cb 100644
--- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
+++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
@@ -358,11 +358,18 @@ static void aspeed_gfx_remove(struct platform_device *pdev)
 	sysfs_remove_group(&pdev->dev.kobj, &aspeed_sysfs_attr_group);
 	drm_dev_unregister(drm);
 	aspeed_gfx_unload(drm);
+	drm_atomic_helper_shutdown(drm);
+}
+
+static void aspeed_gfx_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
 }
 
 static struct platform_driver aspeed_gfx_platform_driver = {
 	.probe		= aspeed_gfx_probe,
 	.remove_new	= aspeed_gfx_remove,
+	.shutdown	= aspeed_gfx_shutdown,
 	.driver = {
 		.name = "aspeed_gfx",
 		.of_match_table = aspeed_gfx_match,
diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c b/drivers/gpu/drm/mgag200/mgag200_drv.c
index abddf37f0ea1..2fb18b782b05 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.c
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.c
@@ -10,6 +10,7 @@
 #include <linux/pci.h>
 
 #include <drm/drm_aperture.h>
+#include <drm/drm_atomic_helper.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fbdev_generic.h>
 #include <drm/drm_file.h>
@@ -278,6 +279,12 @@ static void mgag200_pci_remove(struct pci_dev *pdev)
 	struct drm_device *dev = pci_get_drvdata(pdev);
 
 	drm_dev_unregister(dev);
+	drm_atomic_helper_shutdown(dev);
+}
+
+static void mgag200_pci_shutdown(struct pci_dev *pdev)
+{
+	drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
 }
 
 static struct pci_driver mgag200_pci_driver = {
@@ -285,6 +292,7 @@ static struct pci_driver mgag200_pci_driver = {
 	.id_table = mgag200_pciidlist,
 	.probe = mgag200_pci_probe,
 	.remove = mgag200_pci_remove,
+	.shutdown = mgag200_pci_shutdown,
 };
 
 drm_module_pci_driver_if_modeset(mgag200_pci_driver, mgag200_modeset);
diff --git a/drivers/gpu/drm/pl111/pl111_drv.c b/drivers/gpu/drm/pl111/pl111_drv.c
index ba3b5b5f0cdf..02e6b74d5016 100644
--- a/drivers/gpu/drm/pl111/pl111_drv.c
+++ b/drivers/gpu/drm/pl111/pl111_drv.c
@@ -323,12 +323,18 @@ static void pl111_amba_remove(struct amba_device *amba_dev)
 	struct pl111_drm_dev_private *priv = drm->dev_private;
 
 	drm_dev_unregister(drm);
+	drm_atomic_helper_shutdown(drm);
 	if (priv->panel)
 		drm_panel_bridge_remove(priv->bridge);
 	drm_dev_put(drm);
 	of_reserved_mem_device_release(dev);
 }
 
+static void pl111_amba_shutdown(struct amba_device *amba_dev)
+{
+	drm_atomic_helper_shutdown(amba_get_drvdata(amba_dev));
+}
+
 /*
  * This early variant lacks the 565 and 444 pixel formats.
  */
@@ -431,6 +437,7 @@ static struct amba_driver pl111_amba_driver __maybe_unused = {
 	},
 	.probe = pl111_amba_probe,
 	.remove = pl111_amba_remove,
+	.shutdown = pl111_amba_shutdown,
 	.id_table = pl111_id_table,
 };
 
diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c
index c68c831136c9..e8523abef27a 100644
--- a/drivers/gpu/drm/stm/drv.c
+++ b/drivers/gpu/drm/stm/drv.c
@@ -114,6 +114,7 @@ static void drv_unload(struct drm_device *ddev)
 	DRM_DEBUG("%s\n", __func__);
 
 	drm_kms_helper_poll_fini(ddev);
+	drm_atomic_helper_shutdown(ddev);
 	ltdc_unload(ddev);
 }
 
@@ -225,6 +226,11 @@ static void stm_drm_platform_remove(struct platform_device *pdev)
 	drm_dev_put(ddev);
 }
 
+static void stm_drm_platform_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
+}
+
 static const struct of_device_id drv_dt_ids[] = {
 	{ .compatible = "st,stm32-ltdc"},
 	{ /* end node */ },
@@ -234,6 +240,7 @@ MODULE_DEVICE_TABLE(of, drv_dt_ids);
 static struct platform_driver stm_drm_platform_driver = {
 	.probe = stm_drm_platform_probe,
 	.remove_new = stm_drm_platform_remove,
+	.shutdown = stm_drm_platform_shutdown,
 	.driver = {
 		.name = "stm32-display",
 		.of_match_table = drv_dt_ids,
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index fe56beea3e93..8ebd7134ee21 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -175,6 +175,7 @@ static void tilcdc_fini(struct drm_device *dev)
 		drm_dev_unregister(dev);
 
 	drm_kms_helper_poll_fini(dev);
+	drm_atomic_helper_shutdown(dev);
 	tilcdc_irq_uninstall(dev);
 	drm_mode_config_cleanup(dev);
 
@@ -389,6 +390,7 @@ static int tilcdc_init(const struct drm_driver *ddrv, struct device *dev)
 
 init_failed:
 	tilcdc_fini(ddev);
+	platform_set_drvdata(pdev, NULL);
 
 	return ret;
 }
@@ -537,7 +539,8 @@ static void tilcdc_unbind(struct device *dev)
 	if (!ddev->dev_private)
 		return;
 
-	tilcdc_fini(dev_get_drvdata(dev));
+	tilcdc_fini(ddev);
+	dev_set_drvdata(dev, NULL);
 }
 
 static const struct component_master_ops tilcdc_comp_ops = {
@@ -582,6 +585,11 @@ static int tilcdc_pdev_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static void tilcdc_pdev_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
+}
+
 static const struct of_device_id tilcdc_of_match[] = {
 		{ .compatible = "ti,am33xx-tilcdc", },
 		{ .compatible = "ti,da850-tilcdc", },
@@ -592,6 +600,7 @@ MODULE_DEVICE_TABLE(of, tilcdc_of_match);
 static struct platform_driver tilcdc_platform_driver = {
 	.probe      = tilcdc_pdev_probe,
 	.remove     = tilcdc_pdev_remove,
+	.shutdown   = tilcdc_pdev_shutdown,
 	.driver     = {
 		.name   = "tilcdc",
 		.pm     = pm_sleep_ptr(&tilcdc_pm_ops),
diff --git a/drivers/gpu/drm/tve200/tve200_drv.c b/drivers/gpu/drm/tve200/tve200_drv.c
index 0bb56d063536..acce210e2554 100644
--- a/drivers/gpu/drm/tve200/tve200_drv.c
+++ b/drivers/gpu/drm/tve200/tve200_drv.c
@@ -242,6 +242,7 @@ static void tve200_remove(struct platform_device *pdev)
 	struct tve200_drm_dev_private *priv = drm->dev_private;
 
 	drm_dev_unregister(drm);
+	drm_atomic_helper_shutdown(drm);
 	if (priv->panel)
 		drm_panel_bridge_remove(priv->bridge);
 	drm_mode_config_cleanup(drm);
@@ -249,6 +250,11 @@ static void tve200_remove(struct platform_device *pdev)
 	drm_dev_put(drm);
 }
 
+static void tve200_shutdown(struct platform_device *pdev)
+{
+	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
+}
+
 static const struct of_device_id tve200_of_match[] = {
 	{
 		.compatible = "faraday,tve200",
@@ -263,6 +269,7 @@ static struct platform_driver tve200_driver = {
 	},
 	.probe = tve200_probe,
 	.remove_new = tve200_remove,
+	.shutdown = tve200_shutdown,
 };
 drm_module_platform_driver(tve200_driver);
 
diff --git a/drivers/gpu/drm/vboxvideo/vbox_drv.c b/drivers/gpu/drm/vboxvideo/vbox_drv.c
index 4fee15c97c34..047b95812334 100644
--- a/drivers/gpu/drm/vboxvideo/vbox_drv.c
+++ b/drivers/gpu/drm/vboxvideo/vbox_drv.c
@@ -12,6 +12,7 @@
 #include <linux/vt_kern.h>
 
 #include <drm/drm_aperture.h>
+#include <drm/drm_atomic_helper.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fbdev_generic.h>
 #include <drm/drm_file.h>
@@ -97,11 +98,19 @@ static void vbox_pci_remove(struct pci_dev *pdev)
 	struct vbox_private *vbox = pci_get_drvdata(pdev);
 
 	drm_dev_unregister(&vbox->ddev);
+	drm_atomic_helper_shutdown(&vbox->ddev);
 	vbox_irq_fini(vbox);
 	vbox_mode_fini(vbox);
 	vbox_hw_fini(vbox);
 }
 
+static void vbox_pci_shutdown(struct pci_dev *pdev)
+{
+	struct vbox_private *vbox = pci_get_drvdata(pdev);
+
+	drm_atomic_helper_shutdown(&vbox->ddev);
+}
+
 static int vbox_pm_suspend(struct device *dev)
 {
 	struct vbox_private *vbox = dev_get_drvdata(dev);
@@ -165,6 +174,7 @@ static struct pci_driver vbox_pci_driver = {
 	.id_table = pciidlist,
 	.probe = vbox_pci_probe,
 	.remove = vbox_pci_remove,
+	.shutdown = vbox_pci_shutdown,
 	.driver.pm = pm_sleep_ptr(&vbox_pm_ops),
 };
 
-- 
2.42.0.283.g2d96d420d3-goog


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Re: [RFT PATCH 2/6] drm: Call drm_atomic_helper_shutdown() at shutdown time for misc drivers

[Maxime Ripard]

On Fri, 1 Sep 2023 16:39:53 -0700, Douglas Anderson wrote:
> 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.
> 
> 
> [ ... ]

Acked-by: Maxime Ripard <mripard@kernel.org>

Thanks!
Maxime

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Re: [RFT PATCH 5/6] drm: Call drm_atomic_helper_shutdown() at shutdown/remove time for misc drivers

[Maxime Ripard]

On Fri, 1 Sep 2023 16:39:56 -0700, Douglas Anderson wrote:
> Based on grepping through the source code these drivers appear to be
> missing a call to drm_atomic_helper_shutdown() at system shutdown time
> and at driver remove (or unbind) 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.
> 
> [ ... ]

Acked-by: Maxime Ripard <mripard@kernel.org>

Thanks!
Maxime

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Re: [RFT PATCH 2/6] drm: Call drm_atomic_helper_shutdown() at shutdown time for misc drivers

[Jernej Škrabec]

Dne sobota, 02. september 2023 ob 01:39:53 CEST je Douglas Anderson 
napisal(a):
> 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>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
> This commit is only compile-time tested.
> 
> Note that checkpatch yells that "drivers/gpu/drm/tiny/cirrus.c" is
> marked as 'obsolete', but it seems silly not to include the fix if
> it's already been written. If someone wants me to take that out,
> though, I can.
> 
>  drivers/gpu/drm/arm/display/komeda/komeda_drv.c | 9 +++++++++
>  drivers/gpu/drm/arm/display/komeda/komeda_kms.c | 7 +++++++
>  drivers/gpu/drm/arm/display/komeda/komeda_kms.h | 1 +
>  drivers/gpu/drm/arm/hdlcd_drv.c                 | 6 ++++++
>  drivers/gpu/drm/arm/malidp_drv.c                | 6 ++++++
>  drivers/gpu/drm/ast/ast_drv.c                   | 6 ++++++
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c    | 6 ++++++
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c       | 8 ++++++++
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 6 ++++++
>  drivers/gpu/drm/hyperv/hyperv_drm_drv.c         | 6 ++++++
>  drivers/gpu/drm/logicvc/logicvc_drm.c           | 9 +++++++++
>  drivers/gpu/drm/loongson/lsdc_drv.c             | 6 ++++++
>  drivers/gpu/drm/mcde/mcde_drv.c                 | 9 +++++++++
>  drivers/gpu/drm/omapdrm/omap_drv.c              | 8 ++++++++
>  drivers/gpu/drm/qxl/qxl_drv.c                   | 7 +++++++
>  drivers/gpu/drm/sti/sti_drv.c                   | 7 +++++++
>  drivers/gpu/drm/sun4i/sun4i_drv.c               | 6 ++++++

For sun4i:
Tested-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

>  drivers/gpu/drm/tiny/bochs.c                    | 6 ++++++
>  drivers/gpu/drm/tiny/cirrus.c                   | 6 ++++++
>  19 files changed, 125 insertions(+)




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Re: [RFT PATCH 2/6] drm: Call drm_atomic_helper_shutdown() at shutdown time for misc drivers

[suijingfeng]

Hi,


On 2023/9/2 07:39, Douglas Anderson wrote:
> 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>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---


I have just tested the whole series, thanks for the patch. For drm/loongson only:


Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
Tested-by: Sui Jingfeng <suijingfeng@loongson.cn>



By the way, I add 'pr_info("lsdc_pci_shutdown\n");' into the lsdc_pci_shutdown() function,
And seeing that lsdc_pci_shutdown() will be called when reboot and shutdown the machine.
I did not witness something weird happen at present. As you have said, this is useful for
drm panels drivers. But for the rest(drm/hibmc, drm/ast, drm/mgag200 and drm/loongson etc)
drivers, you didn't mention what's the benefit for those drivers. Probably, you can
mention it with at least one sentence at the next version. I also prefer to alter the
lsdc_pci_shutdown() function as the following pattern:


static void lsdc_pci_shutdown(struct pci_dev *pdev)
{

     struct drm_device *ddev = pci_get_drvdata(pdev);

     drm_atomic_helper_shutdown(ddev);
}



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Re: [RFT PATCH 2/6] drm: Call drm_atomic_helper_shutdown() at shutdown time for misc drivers

[Doug Anderson]

Hi,

On Fri, Sep 15, 2023 at 2:11 AM suijingfeng <suijingfeng@loongson.cn> wrote:
>
> Hi,
>
>
> On 2023/9/2 07:39, Douglas Anderson wrote:
> > 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>
> > Signed-off-by: Douglas Anderson <dianders@chromium.org>
> > ---
>
>
> I have just tested the whole series, thanks for the patch. For drm/loongson only:
>
>
> Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
> Tested-by: Sui Jingfeng <suijingfeng@loongson.cn>

Thanks!


> By the way, I add 'pr_info("lsdc_pci_shutdown\n");' into the lsdc_pci_shutdown() function,
> And seeing that lsdc_pci_shutdown() will be called when reboot and shutdown the machine.
> I did not witness something weird happen at present. As you have said, this is useful for
> drm panels drivers. But for the rest(drm/hibmc, drm/ast, drm/mgag200 and drm/loongson etc)
> drivers, you didn't mention what's the benefit for those drivers.

I didn't mention it because I have no idea! I presume that for
non-drm_panel use cases it's not a huge deal, otherwise it wouldn't
have been missing from so many drivers. Thus, my "one sentence" reason
for the non-drm_panel case is just "we should do this because the
documentation of the API says we should", which is already in the
commit message. ;-)

If you have a specific other benefit you'd like me to list then I'm happy to.


> Probably, you can
> mention it with at least one sentence at the next version. I also prefer to alter the
> lsdc_pci_shutdown() function as the following pattern:
>
>
> static void lsdc_pci_shutdown(struct pci_dev *pdev)
> {
>
>      struct drm_device *ddev = pci_get_drvdata(pdev);
>
>      drm_atomic_helper_shutdown(ddev);
> }

I was hoping to land this patch without spinning it unless there's a
good reason. How strongly do you feel about needing to change the
above? I will note that I coded it the way I did specifically to try
to follow the style in the documentation in "drm_drv.c". In the
example "driver_shutdown()" function you can see that they combined it
into one line and so I followed that style. ;-) That being said, I
have no problem changing this if I spin the patch.

-Doug

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Re: [RFT PATCH 2/6] drm: Call drm_atomic_helper_shutdown() at shutdown time for misc drivers

[suijingfeng]

Hi,


On 2023/9/15 21:44, Doug Anderson wrote:
> Hi,
>
> On Fri, Sep 15, 2023 at 2:11 AM suijingfeng <suijingfeng@loongson.cn> wrote:
>> Hi,
>>
>>
>> On 2023/9/2 07:39, Douglas Anderson wrote:
>>> 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>
>>> Signed-off-by: Douglas Anderson <dianders@chromium.org>
>>> ---
>>
>> I have just tested the whole series, thanks for the patch. For drm/loongson only:
>>
>>
>> Reviewed-by: Sui Jingfeng <suijingfeng@loongson.cn>
>> Tested-by: Sui Jingfeng <suijingfeng@loongson.cn>
> Thanks!
>
>
>> By the way, I add 'pr_info("lsdc_pci_shutdown\n");' into the lsdc_pci_shutdown() function,
>> And seeing that lsdc_pci_shutdown() will be called when reboot and shutdown the machine.
>> I did not witness something weird happen at present. As you have said, this is useful for
>> drm panels drivers. But for the rest(drm/hibmc, drm/ast, drm/mgag200 and drm/loongson etc)
>> drivers, you didn't mention what's the benefit for those drivers.
> I didn't mention it because I have no idea! I presume that for
> non-drm_panel use cases it's not a huge deal, otherwise it wouldn't
> have been missing from so many drivers. Thus, my "one sentence" reason
> for the non-drm_panel case is just "we should do this because the
> documentation of the API says we should", which is already in the
> commit message. ;-)
>

OK, this sound fine.

> If you have a specific other benefit you'd like me to list then I'm happy to.

You should think about the answer of this question yourself.
But I will not object if you can't find one. OK. :-)

>
>> Probably, you can
>> mention it with at least one sentence at the next version. I also prefer to alter the
>> lsdc_pci_shutdown() function as the following pattern:
>>
>>
>> static void lsdc_pci_shutdown(struct pci_dev *pdev)
>> {
>>
>>       struct drm_device *ddev = pci_get_drvdata(pdev);
>>
>>       drm_atomic_helper_shutdown(ddev);
>> }
> I was hoping to land this patch without spinning it unless there's a
> good reason. How strongly do you feel about needing to change the
> above?


Not very strong, this version looks just fine.
I will not object if you keep it as is.
But I will also hear what the others reviewers say.
Thanks for the patch.

>
> -Doug


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Re: [RFT PATCH 5/6] drm: Call drm_atomic_helper_shutdown() at shutdown/remove time for misc drivers

[Tomi Valkeinen]

On 02/09/2023 02:39, Douglas Anderson wrote:
> Based on grepping through the source code these drivers appear to be
> missing a call to drm_atomic_helper_shutdown() at system shutdown time
> and at driver remove (or unbind) 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 and at driver remove (or unbind) time comes
> straight out of the kernel doc "driver instance overview" in
> drm_drv.c.

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

and tested on Beagle Bone Black (tilcdc):

Tested-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> # tilcdc

  Tomi

> 
> A few notes about these fixes:
> - I confirmed that these drivers were all DRIVER_MODESET type drivers,
>    which I believe makes this relevant.
> - I confirmed that these drivers were all DRIVER_ATOMIC.
> - When adding drm_atomic_helper_shutdown() to the remove/unbind path,
>    I added it after drm_kms_helper_poll_fini() when the driver had
>    it. This seemed to be what other drivers did. If
>    drm_kms_helper_poll_fini() wasn't there I added it straight after
>    drm_dev_unregister().
> - This patch deals with drivers using the component model in similar
>    ways as the patch ("drm: Call drm_atomic_helper_shutdown() at
>    shutdown time for misc drivers")
> - These fixes rely on the patch ("drm/atomic-helper:
>    drm_atomic_helper_shutdown(NULL) should be a noop") to simplify
>    shutdown.
> 
> Suggested-by: Maxime Ripard <mripard@kernel.org>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
> 
>   drivers/gpu/drm/aspeed/aspeed_gfx_drv.c |  7 +++++++
>   drivers/gpu/drm/mgag200/mgag200_drv.c   |  8 ++++++++
>   drivers/gpu/drm/pl111/pl111_drv.c       |  7 +++++++
>   drivers/gpu/drm/stm/drv.c               |  7 +++++++
>   drivers/gpu/drm/tilcdc/tilcdc_drv.c     | 11 ++++++++++-
>   drivers/gpu/drm/tve200/tve200_drv.c     |  7 +++++++
>   drivers/gpu/drm/vboxvideo/vbox_drv.c    | 10 ++++++++++
>   7 files changed, 56 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> index d207b03f8357..78122b35a0cb 100644
> --- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> @@ -358,11 +358,18 @@ static void aspeed_gfx_remove(struct platform_device *pdev)
>   	sysfs_remove_group(&pdev->dev.kobj, &aspeed_sysfs_attr_group);
>   	drm_dev_unregister(drm);
>   	aspeed_gfx_unload(drm);
> +	drm_atomic_helper_shutdown(drm);
> +}
> +
> +static void aspeed_gfx_shutdown(struct platform_device *pdev)
> +{
> +	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
>   }
>   
>   static struct platform_driver aspeed_gfx_platform_driver = {
>   	.probe		= aspeed_gfx_probe,
>   	.remove_new	= aspeed_gfx_remove,
> +	.shutdown	= aspeed_gfx_shutdown,
>   	.driver = {
>   		.name = "aspeed_gfx",
>   		.of_match_table = aspeed_gfx_match,
> diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c b/drivers/gpu/drm/mgag200/mgag200_drv.c
> index abddf37f0ea1..2fb18b782b05 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_drv.c
> +++ b/drivers/gpu/drm/mgag200/mgag200_drv.c
> @@ -10,6 +10,7 @@
>   #include <linux/pci.h>
>   
>   #include <drm/drm_aperture.h>
> +#include <drm/drm_atomic_helper.h>
>   #include <drm/drm_drv.h>
>   #include <drm/drm_fbdev_generic.h>
>   #include <drm/drm_file.h>
> @@ -278,6 +279,12 @@ static void mgag200_pci_remove(struct pci_dev *pdev)
>   	struct drm_device *dev = pci_get_drvdata(pdev);
>   
>   	drm_dev_unregister(dev);
> +	drm_atomic_helper_shutdown(dev);
> +}
> +
> +static void mgag200_pci_shutdown(struct pci_dev *pdev)
> +{
> +	drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
>   }
>   
>   static struct pci_driver mgag200_pci_driver = {
> @@ -285,6 +292,7 @@ static struct pci_driver mgag200_pci_driver = {
>   	.id_table = mgag200_pciidlist,
>   	.probe = mgag200_pci_probe,
>   	.remove = mgag200_pci_remove,
> +	.shutdown = mgag200_pci_shutdown,
>   };
>   
>   drm_module_pci_driver_if_modeset(mgag200_pci_driver, mgag200_modeset);
> diff --git a/drivers/gpu/drm/pl111/pl111_drv.c b/drivers/gpu/drm/pl111/pl111_drv.c
> index ba3b5b5f0cdf..02e6b74d5016 100644
> --- a/drivers/gpu/drm/pl111/pl111_drv.c
> +++ b/drivers/gpu/drm/pl111/pl111_drv.c
> @@ -323,12 +323,18 @@ static void pl111_amba_remove(struct amba_device *amba_dev)
>   	struct pl111_drm_dev_private *priv = drm->dev_private;
>   
>   	drm_dev_unregister(drm);
> +	drm_atomic_helper_shutdown(drm);
>   	if (priv->panel)
>   		drm_panel_bridge_remove(priv->bridge);
>   	drm_dev_put(drm);
>   	of_reserved_mem_device_release(dev);
>   }
>   
> +static void pl111_amba_shutdown(struct amba_device *amba_dev)
> +{
> +	drm_atomic_helper_shutdown(amba_get_drvdata(amba_dev));
> +}
> +
>   /*
>    * This early variant lacks the 565 and 444 pixel formats.
>    */
> @@ -431,6 +437,7 @@ static struct amba_driver pl111_amba_driver __maybe_unused = {
>   	},
>   	.probe = pl111_amba_probe,
>   	.remove = pl111_amba_remove,
> +	.shutdown = pl111_amba_shutdown,
>   	.id_table = pl111_id_table,
>   };
>   
> diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c
> index c68c831136c9..e8523abef27a 100644
> --- a/drivers/gpu/drm/stm/drv.c
> +++ b/drivers/gpu/drm/stm/drv.c
> @@ -114,6 +114,7 @@ static void drv_unload(struct drm_device *ddev)
>   	DRM_DEBUG("%s\n", __func__);
>   
>   	drm_kms_helper_poll_fini(ddev);
> +	drm_atomic_helper_shutdown(ddev);
>   	ltdc_unload(ddev);
>   }
>   
> @@ -225,6 +226,11 @@ static void stm_drm_platform_remove(struct platform_device *pdev)
>   	drm_dev_put(ddev);
>   }
>   
> +static void stm_drm_platform_shutdown(struct platform_device *pdev)
> +{
> +	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
> +}
> +
>   static const struct of_device_id drv_dt_ids[] = {
>   	{ .compatible = "st,stm32-ltdc"},
>   	{ /* end node */ },
> @@ -234,6 +240,7 @@ MODULE_DEVICE_TABLE(of, drv_dt_ids);
>   static struct platform_driver stm_drm_platform_driver = {
>   	.probe = stm_drm_platform_probe,
>   	.remove_new = stm_drm_platform_remove,
> +	.shutdown = stm_drm_platform_shutdown,
>   	.driver = {
>   		.name = "stm32-display",
>   		.of_match_table = drv_dt_ids,
> diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> index fe56beea3e93..8ebd7134ee21 100644
> --- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> +++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
> @@ -175,6 +175,7 @@ static void tilcdc_fini(struct drm_device *dev)
>   		drm_dev_unregister(dev);
>   
>   	drm_kms_helper_poll_fini(dev);
> +	drm_atomic_helper_shutdown(dev);
>   	tilcdc_irq_uninstall(dev);
>   	drm_mode_config_cleanup(dev);
>   
> @@ -389,6 +390,7 @@ static int tilcdc_init(const struct drm_driver *ddrv, struct device *dev)
>   
>   init_failed:
>   	tilcdc_fini(ddev);
> +	platform_set_drvdata(pdev, NULL);
>   
>   	return ret;
>   }
> @@ -537,7 +539,8 @@ static void tilcdc_unbind(struct device *dev)
>   	if (!ddev->dev_private)
>   		return;
>   
> -	tilcdc_fini(dev_get_drvdata(dev));
> +	tilcdc_fini(ddev);
> +	dev_set_drvdata(dev, NULL);
>   }
>   
>   static const struct component_master_ops tilcdc_comp_ops = {
> @@ -582,6 +585,11 @@ static int tilcdc_pdev_remove(struct platform_device *pdev)
>   	return 0;
>   }
>   
> +static void tilcdc_pdev_shutdown(struct platform_device *pdev)
> +{
> +	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
> +}
> +
>   static const struct of_device_id tilcdc_of_match[] = {
>   		{ .compatible = "ti,am33xx-tilcdc", },
>   		{ .compatible = "ti,da850-tilcdc", },
> @@ -592,6 +600,7 @@ MODULE_DEVICE_TABLE(of, tilcdc_of_match);
>   static struct platform_driver tilcdc_platform_driver = {
>   	.probe      = tilcdc_pdev_probe,
>   	.remove     = tilcdc_pdev_remove,
> +	.shutdown   = tilcdc_pdev_shutdown,
>   	.driver     = {
>   		.name   = "tilcdc",
>   		.pm     = pm_sleep_ptr(&tilcdc_pm_ops),
> diff --git a/drivers/gpu/drm/tve200/tve200_drv.c b/drivers/gpu/drm/tve200/tve200_drv.c
> index 0bb56d063536..acce210e2554 100644
> --- a/drivers/gpu/drm/tve200/tve200_drv.c
> +++ b/drivers/gpu/drm/tve200/tve200_drv.c
> @@ -242,6 +242,7 @@ static void tve200_remove(struct platform_device *pdev)
>   	struct tve200_drm_dev_private *priv = drm->dev_private;
>   
>   	drm_dev_unregister(drm);
> +	drm_atomic_helper_shutdown(drm);
>   	if (priv->panel)
>   		drm_panel_bridge_remove(priv->bridge);
>   	drm_mode_config_cleanup(drm);
> @@ -249,6 +250,11 @@ static void tve200_remove(struct platform_device *pdev)
>   	drm_dev_put(drm);
>   }
>   
> +static void tve200_shutdown(struct platform_device *pdev)
> +{
> +	drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
> +}
> +
>   static const struct of_device_id tve200_of_match[] = {
>   	{
>   		.compatible = "faraday,tve200",
> @@ -263,6 +269,7 @@ static struct platform_driver tve200_driver = {
>   	},
>   	.probe = tve200_probe,
>   	.remove_new = tve200_remove,
> +	.shutdown = tve200_shutdown,
>   };
>   drm_module_platform_driver(tve200_driver);
>   
> diff --git a/drivers/gpu/drm/vboxvideo/vbox_drv.c b/drivers/gpu/drm/vboxvideo/vbox_drv.c
> index 4fee15c97c34..047b95812334 100644
> --- a/drivers/gpu/drm/vboxvideo/vbox_drv.c
> +++ b/drivers/gpu/drm/vboxvideo/vbox_drv.c
> @@ -12,6 +12,7 @@
>   #include <linux/vt_kern.h>
>   
>   #include <drm/drm_aperture.h>
> +#include <drm/drm_atomic_helper.h>
>   #include <drm/drm_drv.h>
>   #include <drm/drm_fbdev_generic.h>
>   #include <drm/drm_file.h>
> @@ -97,11 +98,19 @@ static void vbox_pci_remove(struct pci_dev *pdev)
>   	struct vbox_private *vbox = pci_get_drvdata(pdev);
>   
>   	drm_dev_unregister(&vbox->ddev);
> +	drm_atomic_helper_shutdown(&vbox->ddev);
>   	vbox_irq_fini(vbox);
>   	vbox_mode_fini(vbox);
>   	vbox_hw_fini(vbox);
>   }
>   
> +static void vbox_pci_shutdown(struct pci_dev *pdev)
> +{
> +	struct vbox_private *vbox = pci_get_drvdata(pdev);
> +
> +	drm_atomic_helper_shutdown(&vbox->ddev);
> +}
> +
>   static int vbox_pm_suspend(struct device *dev)
>   {
>   	struct vbox_private *vbox = dev_get_drvdata(dev);
> @@ -165,6 +174,7 @@ static struct pci_driver vbox_pci_driver = {
>   	.id_table = pciidlist,
>   	.probe = vbox_pci_probe,
>   	.remove = vbox_pci_remove,
> +	.shutdown = vbox_pci_shutdown,
>   	.driver.pm = pm_sleep_ptr(&vbox_pm_ops),
>   };
>   


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Re: [RFT PATCH 2/6] drm: Call drm_atomic_helper_shutdown() at shutdown time for misc drivers

[Tomi Valkeinen]

On 02/09/2023 02:39, Douglas Anderson wrote:
> 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>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>

For omapdrm:

Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Tested-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

  Tomi


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Re: [RFT PATCH 2/6] drm: Call drm_atomic_helper_shutdown() at shutdown time for misc drivers

[Doug Anderson]

Hi,

On Fri, Sep 1, 2023 at 4:40 PM Douglas Anderson <dianders@chromium.org> wrote:
>
> 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>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
> This commit is only compile-time tested.
>
> Note that checkpatch yells that "drivers/gpu/drm/tiny/cirrus.c" is
> marked as 'obsolete', but it seems silly not to include the fix if
> it's already been written. If someone wants me to take that out,
> though, I can.
>
>  drivers/gpu/drm/arm/display/komeda/komeda_drv.c | 9 +++++++++
>  drivers/gpu/drm/arm/display/komeda/komeda_kms.c | 7 +++++++
>  drivers/gpu/drm/arm/display/komeda/komeda_kms.h | 1 +
>  drivers/gpu/drm/arm/hdlcd_drv.c                 | 6 ++++++
>  drivers/gpu/drm/arm/malidp_drv.c                | 6 ++++++
>  drivers/gpu/drm/ast/ast_drv.c                   | 6 ++++++
>  drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c    | 6 ++++++
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c       | 8 ++++++++
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 6 ++++++
>  drivers/gpu/drm/hyperv/hyperv_drm_drv.c         | 6 ++++++
>  drivers/gpu/drm/logicvc/logicvc_drm.c           | 9 +++++++++
>  drivers/gpu/drm/loongson/lsdc_drv.c             | 6 ++++++
>  drivers/gpu/drm/mcde/mcde_drv.c                 | 9 +++++++++
>  drivers/gpu/drm/omapdrm/omap_drv.c              | 8 ++++++++
>  drivers/gpu/drm/qxl/qxl_drv.c                   | 7 +++++++
>  drivers/gpu/drm/sti/sti_drv.c                   | 7 +++++++
>  drivers/gpu/drm/sun4i/sun4i_drv.c               | 6 ++++++
>  drivers/gpu/drm/tiny/bochs.c                    | 6 ++++++
>  drivers/gpu/drm/tiny/cirrus.c                   | 6 ++++++
>  19 files changed, 125 insertions(+)

This has been about 3 weeks now and it feels like that's enough bake
time and several people have managed to test it (thanks!). Landing in
drm-misc-next:

ce3d99c83495 drm: Call drm_atomic_helper_shutdown() at shutdown time
for misc drivers

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Re: [RFT PATCH 5/6] drm: Call drm_atomic_helper_shutdown() at shutdown/remove time for misc drivers

[Doug Anderson]

Hi,

On Fri, Sep 1, 2023 at 4:41 PM Douglas Anderson <dianders@chromium.org> wrote:
>
> Based on grepping through the source code these drivers appear to be
> missing a call to drm_atomic_helper_shutdown() at system shutdown time
> and at driver remove (or unbind) 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 and at driver remove (or unbind) time comes
> straight out of the kernel doc "driver instance overview" in
> drm_drv.c.
>
> A few notes about these fixes:
> - I confirmed that these drivers were all DRIVER_MODESET type drivers,
>   which I believe makes this relevant.
> - I confirmed that these drivers were all DRIVER_ATOMIC.
> - When adding drm_atomic_helper_shutdown() to the remove/unbind path,
>   I added it after drm_kms_helper_poll_fini() when the driver had
>   it. This seemed to be what other drivers did. If
>   drm_kms_helper_poll_fini() wasn't there I added it straight after
>   drm_dev_unregister().
> - This patch deals with drivers using the component model in similar
>   ways as the patch ("drm: Call drm_atomic_helper_shutdown() at
>   shutdown time for misc drivers")
> - These fixes rely on the patch ("drm/atomic-helper:
>   drm_atomic_helper_shutdown(NULL) should be a noop") to simplify
>   shutdown.
>
> Suggested-by: Maxime Ripard <mripard@kernel.org>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
>
>  drivers/gpu/drm/aspeed/aspeed_gfx_drv.c |  7 +++++++
>  drivers/gpu/drm/mgag200/mgag200_drv.c   |  8 ++++++++
>  drivers/gpu/drm/pl111/pl111_drv.c       |  7 +++++++
>  drivers/gpu/drm/stm/drv.c               |  7 +++++++
>  drivers/gpu/drm/tilcdc/tilcdc_drv.c     | 11 ++++++++++-
>  drivers/gpu/drm/tve200/tve200_drv.c     |  7 +++++++
>  drivers/gpu/drm/vboxvideo/vbox_drv.c    | 10 ++++++++++
>  7 files changed, 56 insertions(+), 1 deletion(-)

Landed on drm-misc-next:

3c4babae3c4a drm: Call drm_atomic_helper_shutdown() at shutdown/remove
time for misc drivers

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