drm: hibmc: fix vga UNF ras error for rebooting system

When rebooting this system, this vga will report unf bit error as follow:

[  OK  ] Reached target Unmount All Filesystems.
[  OK  ] Stopped Remount Root and Kernel File Systems.
[  OK  ] Reached target Shutdown.
[  OK  ] Reached target Final Step.
Starting Reboot...
[  OK  ] Stopped LVM2 metadata daemon.
NOTICE:  ####################################

NOTICE:  [PciRasInterruptHandle]:[385L] PcieRasTestInterruptHandler

NOTICE:  ####################################

NOTICE:  [PciRasInterruptHandle]:[398L] CPU0 PCIe RAS Check...

NOTICE:  [PciRasInterruptHandle]:[409L] Chip: 0x0, PCIe_CE_status  = 0x0
NOTICE:  [PciRasInterruptHandle]:[410L] Chip: 0x0, PCIe_UNF_status = 0x10000
NOTICE:  [PciRasInterruptHandle]:[411L] Chip: 0x0, PCIe_UF_status  = 0x0
NOTICE:  [PciRasInterruptHandle]:[426L] RP Error Source Identify = 0x800000
NOTICE:  [PciRasInterruptHandle]:[438L] ErrSrc Identify = (Bus:0x0) (Dev:0x10) (Func: 0x0)

NOTICE:  [PciRasInterruptHandle]:[457L]  DevSts = 0xa
NOTICE:  [PciRasInterruptHandle]:[458L]    UncErrSts = 0x100000
NOTICE:  [PciRasInterruptHandle]:[459L]      CorErrSts = 0x0
NOTICE:  [PciRasInterruptHandle]:[460L]        RootErrSts = 0x8000024
NOTICE:  ####################################

NOTICE:  Before Notify OS, Dump AER Error data.

Feature or Bugfix:Bugfix
Signed-off-by: Nallan.wang <allan.wang@siliconmotion.com>
Signed-off-by: NXinwei Kong <kong.kongxinwei@hisilicon.com>
Signed-off-by: Nkong.kongxinwei <kong.kongxinwei@hisilicon.com>
Reviewed-by: Nliudongdong <liudongdong3@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

@@ -70,7 +70,7 @@ static struct drm_driver hibmc_driver = {
 	.irq_handler		= hibmc_drm_interrupt,
 };
 
-static int __maybe_unused hibmc_pm_suspend(struct device *dev)
+static int hibmc_pm_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
@@ -88,7 +88,7 @@ static int __maybe_unused hibmc_pm_suspend(struct device *dev)
 	return 0;
 }
 
-static int  __maybe_unused hibmc_pm_resume(struct device *dev)
+static int hibmc_pm_resume(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
@@ -115,7 +115,7 @@ static int hibmc_kms_init(struct hibmc_drm_private *priv)
 	priv->dev->mode_config.min_width = 0;
 	priv->dev->mode_config.min_height = 0;
 	priv->dev->mode_config.max_width = 1920;
-	priv->dev->mode_config.max_height = 1440;
+	priv->dev->mode_config.max_height = 1200;
 
 	priv->dev->mode_config.fb_base = priv->fb_base;
 	priv->dev->mode_config.preferred_depth = 24;
@@ -138,6 +138,21 @@ static int hibmc_kms_init(struct hibmc_drm_private *priv)
 	return 0;
 }
 
+static void hibmc_hw_unmap(struct hibmc_drm_private *priv)
+{
+	struct drm_device *dev = priv->dev;
+
+	if (priv->mmio) {
+		devm_iounmap(dev->dev, priv->mmio);
+		priv->mmio = NULL;
+	}
+
+	if (priv->fb_map) {
+		devm_iounmap(dev->dev, priv->fb_map);
+		priv->fb_map = NULL;
+	}
+}
+
 static void hibmc_kms_fini(struct hibmc_drm_private *priv)
 {
 	if (priv->mode_config_initialized) {
@@ -284,6 +299,7 @@ static int hibmc_unload(struct drm_device *dev)
 
 	hibmc_kms_fini(priv);
 	hibmc_mm_fini(priv);
+	hibmc_hw_unmap(priv);
 	dev->dev_private = NULL;
 	return 0;
 }
@@ -398,9 +414,15 @@ static void hibmc_pci_remove(struct pci_dev *pdev)
 
 	drm_dev_unregister(dev);
 	hibmc_unload(dev);
+	pci_disable_device(pdev);
 	drm_dev_unref(dev);
 }
 
+static void hibmc_pci_shutdown(struct pci_dev *pdev)
+{
+	hibmc_pci_remove(pdev);
+}
+
 static struct pci_device_id hibmc_pci_table[] = {
 	{0x19e5, 0x1711, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
 	{0,}
@@ -411,6 +433,7 @@ 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,
 };