drm/mgag200: Remove several references to struct mga_device.dev

Done in preparation of embedding the DRM device in struct mga_device.
This patch makes the patch for embedding more readable.

v2:
	* improved commit message (Daniel)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200507090315.21274-3-tzimmermann@suse.de

drivers/gpu/drm/mgag200/mgag200_main.c

@@ -66,25 +66,26 @@ static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
 /* Map the framebuffer from the card and configure the core */
 static int mga_vram_init(struct mga_device *mdev)
 {
+	struct drm_device *dev = mdev->dev;
 	void __iomem *mem;
 
 	/* BAR 0 is VRAM */
-	mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
-	mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);
+	mdev->mc.vram_base = pci_resource_start(dev->pdev, 0);
+	mdev->mc.vram_window = pci_resource_len(dev->pdev, 0);
 
-	if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
-				"mgadrmfb_vram")) {
+	if (!devm_request_mem_region(dev->dev, mdev->mc.vram_base,
+				     mdev->mc.vram_window, "mgadrmfb_vram")) {
 		DRM_ERROR("can't reserve VRAM\n");
 		return -ENXIO;
 	}
 
-	mem = pci_iomap(mdev->dev->pdev, 0, 0);
+	mem = pci_iomap(dev->pdev, 0, 0);
 	if (!mem)
 		return -ENOMEM;
 
 	mdev->mc.vram_size = mga_probe_vram(mdev, mem);
 
-	pci_iounmap(mdev->dev->pdev, mem);
+	pci_iounmap(dev->pdev, mem);
 
 	return 0;
 }
@@ -105,12 +106,12 @@ static int mgag200_device_init(struct drm_device *dev,
 	mdev->has_sdram = !(option & (1 << 14));
 
 	/* BAR 0 is the framebuffer, BAR 1 contains registers */
-	mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
-	mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);
+	mdev->rmmio_base = pci_resource_start(dev->pdev, 1);
+	mdev->rmmio_size = pci_resource_len(dev->pdev, 1);
 
-	if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
-				"mgadrmfb_mmio")) {
-		DRM_ERROR("can't reserve mmio registers\n");
+	if (!devm_request_mem_region(dev->dev, mdev->rmmio_base,
+				     mdev->rmmio_size, "mgadrmfb_mmio")) {
+		drm_err(dev, "can't reserve mmio registers\n");
 		return -ENOMEM;
 	}
 

drivers/gpu/drm/mgag200/mgag200_mode.c

@@ -1433,6 +1433,7 @@ static const struct drm_crtc_helper_funcs mga_helper_funcs = {
 /* CRTC setup */
 static void mga_crtc_init(struct mga_device *mdev)
 {
+	struct drm_device *dev = mdev->dev;
 	struct mga_crtc *mga_crtc;
 
 	mga_crtc = kzalloc(sizeof(struct mga_crtc) +
@@ -1442,7 +1443,7 @@ static void mga_crtc_init(struct mga_device *mdev)
 	if (mga_crtc == NULL)
 		return;
 
-	drm_crtc_init(mdev->dev, &mga_crtc->base, &mga_crtc_funcs);
+	drm_crtc_init(dev, &mga_crtc->base, &mga_crtc_funcs);
 
 	drm_mode_crtc_set_gamma_size(&mga_crtc->base, MGAG200_LUT_SIZE);
 	mdev->mode_info.crtc = mga_crtc;
@@ -1617,30 +1618,30 @@ static struct drm_connector *mga_vga_init(struct drm_device *dev)
 
 int mgag200_modeset_init(struct mga_device *mdev)
 {
+	struct drm_device *dev = mdev->dev;
 	struct drm_encoder *encoder = &mdev->encoder;
 	struct drm_connector *connector;
 	int ret;
 
 	mdev->mode_info.mode_config_initialized = true;
 
-	mdev->dev->mode_config.max_width = MGAG200_MAX_FB_WIDTH;
-	mdev->dev->mode_config.max_height = MGAG200_MAX_FB_HEIGHT;
+	dev->mode_config.max_width = MGAG200_MAX_FB_WIDTH;
+	dev->mode_config.max_height = MGAG200_MAX_FB_HEIGHT;
 
-	mdev->dev->mode_config.fb_base = mdev->mc.vram_base;
+	dev->mode_config.fb_base = mdev->mc.vram_base;
 
 	mga_crtc_init(mdev);
 
-	ret = drm_simple_encoder_init(mdev->dev, encoder,
-				      DRM_MODE_ENCODER_DAC);
+	ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_DAC);
 	if (ret) {
-		drm_err(mdev->dev,
+		drm_err(dev,
 			"drm_simple_encoder_init() failed, error %d\n",
 			ret);
 		return ret;
 	}
 	encoder->possible_crtcs = 0x1;
 
-	connector = mga_vga_init(mdev->dev);
+	connector = mga_vga_init(dev);
 	if (!connector) {
 		DRM_ERROR("mga_vga_init failed\n");
 		return -1;