drm/mgag200: Move PCI-option setup into model-specific code

Split the PCI code into a single call for each model. G200 and G200SE
each contain a dedicated helper with additional instructions. Noteably,
the G200ER has no code for PCI setup.

In a later patch, the magic numbers should be replaced by descriptive
constants.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Tested-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220601112522.5774-4-tzimmermann@suse.de

drivers/gpu/drm/mgag200/mgag200_drv.c

@@ -24,6 +24,32 @@ int mgag200_modeset = -1;
 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
 module_param_named(modeset, mgag200_modeset, int, 0400);
 
+int mgag200_init_pci_options(struct pci_dev *pdev, u32 option, u32 option2)
+{
+	struct device *dev = &pdev->dev;
+	int err;
+
+	err = pci_read_config_dword(pdev, PCI_MGA_OPTION, &option);
+	if (err != PCIBIOS_SUCCESSFUL) {
+		dev_err(dev, "pci_read_config_dword(PCI_MGA_OPTION) failed: %d\n", err);
+		return pcibios_err_to_errno(err);
+	}
+
+	err = pci_write_config_dword(pdev, PCI_MGA_OPTION, option);
+	if (err != PCIBIOS_SUCCESSFUL) {
+		dev_err(dev, "pci_write_config_dword(PCI_MGA_OPTION) failed: %d\n", err);
+		return pcibios_err_to_errno(err);
+	}
+
+	err = pci_write_config_dword(pdev, PCI_MGA_OPTION2, option2);
+	if (err != PCIBIOS_SUCCESSFUL) {
+		dev_err(dev, "pci_write_config_dword(PCI_MGA_OPTION2) failed: %d\n", err);
+		return pcibios_err_to_errno(err);
+	}
+
+	return 0;
+}
+
 /*
  * DRM driver
  */
@@ -46,25 +72,10 @@ static const struct drm_driver mgag200_driver = {
  * DRM device
  */
 
-static bool mgag200_has_sgram(struct mga_device *mdev)
-{
-	struct drm_device *dev = &mdev->base;
-	struct pci_dev *pdev = to_pci_dev(dev->dev);
-	u32 option;
-	int ret;
-
-	ret = pci_read_config_dword(pdev, PCI_MGA_OPTION, &option);
-	if (drm_WARN(dev, ret, "failed to read PCI config dword: %d\n", ret))
-		return false;
-
-	return !!(option & PCI_MGA_OPTION_HARDPWMSK);
-}
-
 int mgag200_regs_init(struct mga_device *mdev)
 {
 	struct drm_device *dev = &mdev->base;
 	struct pci_dev *pdev = to_pci_dev(dev->dev);
-	u32 option, option2;
 	u8 crtcext3;
 	int ret;
 
@@ -72,46 +83,6 @@ int mgag200_regs_init(struct mga_device *mdev)
 	if (ret)
 		return ret;
 
-	switch (mdev->type) {
-	case G200_PCI:
-	case G200_AGP:
-		if (mgag200_has_sgram(mdev))
-			option = 0x4049cd21;
-		else
-			option = 0x40499121;
-		option2 = 0x00008000;
-		break;
-	case G200_SE_A:
-	case G200_SE_B:
-		option = 0x40049120;
-		if (mgag200_has_sgram(mdev))
-			option |= PCI_MGA_OPTION_HARDPWMSK;
-		option2 = 0x00008000;
-		break;
-	case G200_WB:
-	case G200_EW3:
-		option = 0x41049120;
-		option2 = 0x0000b000;
-		break;
-	case G200_EV:
-		option = 0x00000120;
-		option2 = 0x0000b000;
-		break;
-	case G200_EH:
-	case G200_EH3:
-		option = 0x00000120;
-		option2 = 0x0000b000;
-		break;
-	default:
-		option = 0;
-		option2 = 0;
-	}
-
-	if (option)
-		pci_write_config_dword(pdev, PCI_MGA_OPTION, option);
-	if (option2)
-		pci_write_config_dword(pdev, PCI_MGA_OPTION2, option2);
-
 	/* BAR 1 contains registers */
 	mdev->rmmio_base = pci_resource_start(pdev, 1);
 	mdev->rmmio_size = pci_resource_len(pdev, 1);

drivers/gpu/drm/mgag200/mgag200_drv.h

@@ -256,6 +256,7 @@ static inline struct mgag200_g200se_device *to_mgag200_g200se_device(struct drm_
 }
 
 				/* mgag200_drv.c */
+int mgag200_init_pci_options(struct pci_dev *pdev, u32 option, u32 option2);
 int mgag200_regs_init(struct mga_device *mdev);
 
 				/* mgag200_<device type>.c */

drivers/gpu/drm/mgag200/mgag200_g200.c

@@ -6,6 +6,29 @@
 
 #include "mgag200_drv.h"
 
+static int mgag200_g200_init_pci_options(struct pci_dev *pdev)
+{
+	struct device *dev = &pdev->dev;
+	bool has_sgram;
+	u32 option;
+	int err;
+
+	err = pci_read_config_dword(pdev, PCI_MGA_OPTION, &option);
+	if (err != PCIBIOS_SUCCESSFUL) {
+		dev_err(dev, "pci_read_config_dword(PCI_MGA_OPTION) failed: %d\n", err);
+		return pcibios_err_to_errno(err);
+	}
+
+	has_sgram = !!(option & PCI_MGA_OPTION_HARDPWMSK);
+
+	if (has_sgram)
+		option = 0x4049cd21;
+	else
+		option = 0x40499121;
+
+	return mgag200_init_pci_options(pdev, option, 0x00008000);
+}
+
 /*
  * DRM Device
  */
@@ -149,6 +172,10 @@ struct mga_device *mgag200_g200_device_create(struct pci_dev *pdev, const struct
 
 	pci_set_drvdata(pdev, dev);
 
+	ret = mgag200_g200_init_pci_options(pdev);
+	if (ret)
+		return ERR_PTR(ret);
+
 	mdev->flags = flags;
 	mdev->type = type;
 

drivers/gpu/drm/mgag200/mgag200_g200eh.c

@@ -27,6 +27,10 @@ struct mga_device *mgag200_g200eh_device_create(struct pci_dev *pdev, const stru
 	mdev->flags = flags;
 	mdev->type = type;
 
+	ret = mgag200_init_pci_options(pdev, 0x00000120, 0x0000b000);
+	if (ret)
+		return ERR_PTR(ret);
+
 	ret = mgag200_regs_init(mdev);
 	if (ret)
 		return ERR_PTR(ret);

drivers/gpu/drm/mgag200/mgag200_g200eh3.c

@@ -28,6 +28,10 @@ struct mga_device *mgag200_g200eh3_device_create(struct pci_dev *pdev,
 	mdev->flags = flags;
 	mdev->type = type;
 
+	ret = mgag200_init_pci_options(pdev, 0x00000120, 0x0000b000);
+	if (ret)
+		return ERR_PTR(ret);
+
 	ret = mgag200_regs_init(mdev);
 	if (ret)
 		return ERR_PTR(ret);

drivers/gpu/drm/mgag200/mgag200_g200ev.c

@@ -24,6 +24,10 @@ struct mga_device *mgag200_g200ev_device_create(struct pci_dev *pdev, const stru
 
 	pci_set_drvdata(pdev, dev);
 
+	ret = mgag200_init_pci_options(pdev, 0x00000120, 0x0000b000);
+	if (ret)
+		return ERR_PTR(ret);
+
 	mdev->flags = flags;
 	mdev->type = type;
 

drivers/gpu/drm/mgag200/mgag200_g200ew3.c

@@ -25,6 +25,10 @@ struct mga_device *mgag200_g200ew3_device_create(struct pci_dev *pdev,
 
 	pci_set_drvdata(pdev, dev);
 
+	ret = mgag200_init_pci_options(pdev, 0x41049120, 0x0000b000);
+	if (ret)
+		return ERR_PTR(ret);
+
 	mdev->flags = flags;
 	mdev->type = type;
 

drivers/gpu/drm/mgag200/mgag200_g200se.c

@@ -6,6 +6,28 @@
 
 #include "mgag200_drv.h"
 
+static int mgag200_g200se_init_pci_options(struct pci_dev *pdev)
+{
+	struct device *dev = &pdev->dev;
+	bool has_sgram;
+	u32 option;
+	int err;
+
+	err = pci_read_config_dword(pdev, PCI_MGA_OPTION, &option);
+	if (err != PCIBIOS_SUCCESSFUL) {
+		dev_err(dev, "pci_read_config_dword(PCI_MGA_OPTION) failed: %d\n", err);
+		return pcibios_err_to_errno(err);
+	}
+
+	has_sgram = !!(option & PCI_MGA_OPTION_HARDPWMSK);
+
+	option = 0x40049120;
+	if (has_sgram)
+		option |= PCI_MGA_OPTION_HARDPWMSK;
+
+	return mgag200_init_pci_options(pdev, option, 0x00008000);
+}
+
 /*
  * DRM device
  */
@@ -37,6 +59,10 @@ struct mga_device *mgag200_g200se_device_create(struct pci_dev *pdev, const stru
 
 	pci_set_drvdata(pdev, dev);
 
+	ret = mgag200_g200se_init_pci_options(pdev);
+	if (ret)
+		return ERR_PTR(ret);
+
 	mdev->flags = flags;
 	mdev->type = type;
 

drivers/gpu/drm/mgag200/mgag200_g200wb.c

@@ -24,6 +24,10 @@ struct mga_device *mgag200_g200wb_device_create(struct pci_dev *pdev, const stru
 
 	pci_set_drvdata(pdev, dev);
 
+	ret = mgag200_init_pci_options(pdev, 0x41049120, 0x0000b000);
+	if (ret)
+		return ERR_PTR(ret);
+
 	mdev->flags = flags;
 	mdev->type = type;