drm/mgag200: Store maximum resolution and memory bandwidth in device info

The maximum resolution and memory bandwidth are model-specific limits.
Both are used during display-mode validation. Store the values in struct
mgag200_device_info and simplify the validation code.

v2:
	* 'bandwith' -> 'bandwidth' in commit message
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/20220601112522.5774-9-tzimmermann@suse.de

drivers/gpu/drm/mgag200/mgag200_drv.h

@@ -191,6 +191,15 @@ enum mga_type {
 #define IS_G200_SE(mdev) (mdev->type == G200_SE_A || mdev->type == G200_SE_B)
 
 struct mgag200_device_info {
+	u16 max_hdisplay;
+	u16 max_vdisplay;
+
+	/*
+	 * Maximum memory bandwidth (MiB/sec). Setting this to zero disables
+	 * the rsp test during mode validation.
+	 */
+	unsigned long max_mem_bandwidth;
+
 	/*
 	 * HW does not handle 'startadd' register correctly. Always set
 	 * it's value to 0.
@@ -198,8 +207,12 @@ struct mgag200_device_info {
 	bool bug_no_startadd:1;
 };
 
-#define MGAG200_DEVICE_INFO_INIT(_bug_no_startadd) \
+#define MGAG200_DEVICE_INFO_INIT(_max_hdisplay, _max_vdisplay, _max_mem_bandwidth, \
+				 _bug_no_startadd) \
 	{ \
+		.max_hdisplay = (_max_hdisplay), \
+		.max_vdisplay = (_max_vdisplay), \
+		.max_mem_bandwidth = (_max_mem_bandwidth), \
 		.bug_no_startadd = (_bug_no_startadd), \
 	}
 

drivers/gpu/drm/mgag200/mgag200_g200.c

@@ -34,7 +34,7 @@ static int mgag200_g200_init_pci_options(struct pci_dev *pdev)
  */
 
 static const struct mgag200_device_info mgag200_g200_device_info =
-	MGAG200_DEVICE_INFO_INIT(false);
+	MGAG200_DEVICE_INFO_INIT(2048, 2048, 0, false);
 
 static void mgag200_g200_interpret_bios(struct mgag200_g200_device *g200,
 					const unsigned char *bios, size_t size)

drivers/gpu/drm/mgag200/mgag200_g200eh.c

@@ -11,7 +11,7 @@
  */
 
 static const struct mgag200_device_info mgag200_g200eh_device_info =
-	MGAG200_DEVICE_INFO_INIT(false);
+	MGAG200_DEVICE_INFO_INIT(2048, 2048, 37500, false);
 
 struct mga_device *mgag200_g200eh_device_create(struct pci_dev *pdev, const struct drm_driver *drv,
 						enum mga_type type)

drivers/gpu/drm/mgag200/mgag200_g200eh3.c

@@ -11,7 +11,7 @@
  */
 
 static const struct mgag200_device_info mgag200_g200eh3_device_info =
-	MGAG200_DEVICE_INFO_INIT(false);
+	MGAG200_DEVICE_INFO_INIT(2048, 2048, 0, false);
 
 struct mga_device *mgag200_g200eh3_device_create(struct pci_dev *pdev,
 						 const struct drm_driver *drv,

drivers/gpu/drm/mgag200/mgag200_g200er.c

@@ -11,7 +11,7 @@
  */
 
 static const struct mgag200_device_info mgag200_g200er_device_info =
-	MGAG200_DEVICE_INFO_INIT(false);
+	MGAG200_DEVICE_INFO_INIT(2048, 2048, 55000, false);
 
 struct mga_device *mgag200_g200er_device_create(struct pci_dev *pdev, const struct drm_driver *drv,
 						enum mga_type type)

drivers/gpu/drm/mgag200/mgag200_g200ev.c

@@ -11,7 +11,7 @@
  */
 
 static const struct mgag200_device_info mgag200_g200ev_device_info =
-	MGAG200_DEVICE_INFO_INIT(false);
+	MGAG200_DEVICE_INFO_INIT(2048, 2048, 32700, false);
 
 struct mga_device *mgag200_g200ev_device_create(struct pci_dev *pdev, const struct drm_driver *drv,
 						enum mga_type type)

drivers/gpu/drm/mgag200/mgag200_g200ew3.c

@@ -11,7 +11,7 @@
  */
 
 static const struct mgag200_device_info mgag200_g200ew3_device_info =
-	MGAG200_DEVICE_INFO_INIT(false);
+	MGAG200_DEVICE_INFO_INIT(2048, 2048, 0, false);
 
 static resource_size_t mgag200_g200ew3_device_probe_vram(struct mga_device *mdev)
 {

drivers/gpu/drm/mgag200/mgag200_g200se.c

@@ -32,21 +32,37 @@ static int mgag200_g200se_init_pci_options(struct pci_dev *pdev)
  * DRM device
  */
 
-static const struct mgag200_device_info mgag200_g200se_a_device_info =
-	MGAG200_DEVICE_INFO_INIT(true);
+static const struct mgag200_device_info mgag200_g200se_a_01_device_info =
+	MGAG200_DEVICE_INFO_INIT(1600, 1200, 24400, true);
 
-static const struct mgag200_device_info mgag200_g200se_b_device_info =
-	MGAG200_DEVICE_INFO_INIT(false);
+static const struct mgag200_device_info mgag200_g200se_a_02_device_info =
+	MGAG200_DEVICE_INFO_INIT(1920, 1200, 30100, true);
 
-static void mgag200_g200se_init_unique_id(struct mgag200_g200se_device *g200se)
+static const struct mgag200_device_info mgag200_g200se_a_03_device_info =
+	MGAG200_DEVICE_INFO_INIT(2048, 2048, 55000, false);
+
+static const struct mgag200_device_info mgag200_g200se_b_01_device_info =
+	MGAG200_DEVICE_INFO_INIT(1600, 1200, 24400, false);
+
+static const struct mgag200_device_info mgag200_g200se_b_02_device_info =
+	MGAG200_DEVICE_INFO_INIT(1920, 1200, 30100, false);
+
+static const struct mgag200_device_info mgag200_g200se_b_03_device_info =
+	MGAG200_DEVICE_INFO_INIT(2048, 2048, 55000, false);
+
+static int mgag200_g200se_init_unique_rev_id(struct mgag200_g200se_device *g200se)
 {
 	struct mga_device *mdev = &g200se->base;
 	struct drm_device *dev = &mdev->base;
 
 	/* stash G200 SE model number for later use */
 	g200se->unique_rev_id = RREG32(0x1e24);
+	if (!g200se->unique_rev_id)
+		return -ENODEV;
 
 	drm_dbg(dev, "G200 SE unique revision id is 0x%x\n", g200se->unique_rev_id);
+
+	return 0;
 }
 
 struct mga_device *mgag200_g200se_device_create(struct pci_dev *pdev, const struct drm_driver *drv,
@@ -75,14 +91,26 @@ struct mga_device *mgag200_g200se_device_create(struct pci_dev *pdev, const stru
 	if (ret)
 		return ERR_PTR(ret);
 
-	mgag200_g200se_init_unique_id(g200se);
+	ret = mgag200_g200se_init_unique_rev_id(g200se);
+	if (ret)
+		return ERR_PTR(ret);
 
 	switch (type) {
 	case G200_SE_A:
-		info = &mgag200_g200se_a_device_info;
+		if (g200se->unique_rev_id >= 0x03)
+			info = &mgag200_g200se_a_03_device_info;
+		else if (g200se->unique_rev_id >= 0x02)
+			info = &mgag200_g200se_a_02_device_info;
+		else
+			info = &mgag200_g200se_a_01_device_info;
 		break;
 	case G200_SE_B:
-		info = &mgag200_g200se_b_device_info;
+		if (g200se->unique_rev_id >= 0x03)
+			info = &mgag200_g200se_b_03_device_info;
+		else if (g200se->unique_rev_id >= 0x02)
+			info = &mgag200_g200se_b_02_device_info;
+		else
+			info = &mgag200_g200se_b_01_device_info;
 		break;
 	default:
 		return ERR_PTR(-EINVAL);

drivers/gpu/drm/mgag200/mgag200_g200wb.c

@@ -11,7 +11,7 @@
  */
 
 static const struct mgag200_device_info mgag200_g200wb_device_info =
-	MGAG200_DEVICE_INFO_INIT(false);
+	MGAG200_DEVICE_INFO_INIT(1280, 1024, 31877, false);
 
 struct mga_device *mgag200_g200wb_device_create(struct pci_dev *pdev, const struct drm_driver *drv,
 						enum mga_type type)

drivers/gpu/drm/mgag200/mgag200_mode.c

@@ -725,30 +725,17 @@ static enum drm_mode_status
 mgag200_simple_display_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
 				       const struct drm_display_mode *mode)
 {
-	struct drm_device *dev = pipe->crtc.dev;
-	struct mga_device *mdev = to_mga_device(dev);
-	struct mgag200_g200se_device *g200se;
-
-	if (IS_G200_SE(mdev)) {
-		g200se = to_mgag200_g200se_device(dev);
-
-		if (g200se->unique_rev_id == 0x01) {
-			if (mode->hdisplay > 1600)
-				return MODE_VIRTUAL_X;
-			if (mode->vdisplay > 1200)
-				return MODE_VIRTUAL_Y;
-		} else if (g200se->unique_rev_id == 0x02) {
-			if (mode->hdisplay > 1920)
-				return MODE_VIRTUAL_X;
-			if (mode->vdisplay > 1200)
-				return MODE_VIRTUAL_Y;
-		}
-	} else if (mdev->type == G200_WB) {
-		if (mode->hdisplay > 1280)
-			return MODE_VIRTUAL_X;
-		if (mode->vdisplay > 1024)
-			return MODE_VIRTUAL_Y;
-	}
+	struct mga_device *mdev = to_mga_device(pipe->crtc.dev);
+	const struct mgag200_device_info *info = mdev->info;
+
+	/*
+	 * Some devices have additional limits on the size of the
+	 * display mode.
+	 */
+	if (mode->hdisplay > info->max_hdisplay)
+		return MODE_VIRTUAL_X;
+	if (mode->vdisplay > info->max_vdisplay)
+		return MODE_VIRTUAL_Y;
 
 	if ((mode->hdisplay % 8) != 0 || (mode->hsync_start % 8) != 0 ||
 	    (mode->hsync_end % 8) != 0 || (mode->htotal % 8) != 0) {
@@ -1028,7 +1015,7 @@ static enum drm_mode_status mgag200_mode_config_mode_valid(struct drm_device *de
 	static const unsigned int max_bpp = 4; // DRM_FORMAT_XRGB8888
 	struct mga_device *mdev = to_mga_device(dev);
 	unsigned long fbsize, fbpages, max_fbpages;
-	struct mgag200_g200se_device *g200se;
+	const struct mgag200_device_info *info = mdev->info;
 
 	max_fbpages = mdev->vram_available >> PAGE_SHIFT;
 
@@ -1038,30 +1025,14 @@ static enum drm_mode_status mgag200_mode_config_mode_valid(struct drm_device *de
 	if (fbpages > max_fbpages)
 		return MODE_MEM;
 
-	if (IS_G200_SE(mdev)) {
-		g200se = to_mgag200_g200se_device(dev);
-
-		if (g200se->unique_rev_id == 0x01) {
-			if (mgag200_calculate_mode_bandwidth(mode, max_bpp * 8) > (24400 * 1024))
-				return MODE_BAD;
-		} else if (g200se->unique_rev_id == 0x02) {
-			if (mgag200_calculate_mode_bandwidth(mode, max_bpp * 8) > (30100 * 1024))
-				return MODE_BAD;
-		} else {
-			if (mgag200_calculate_mode_bandwidth(mode, max_bpp * 8) > (55000 * 1024))
-				return MODE_BAD;
-		}
-	} else if (mdev->type == G200_WB) {
-		if (mgag200_calculate_mode_bandwidth(mode, max_bpp * 8) > (31877 * 1024))
-			return MODE_BAD;
-	} else if (mdev->type == G200_EV) {
-		if (mgag200_calculate_mode_bandwidth(mode, max_bpp * 8) > (32700 * 1024))
-			return MODE_BAD;
-	} else if (mdev->type == G200_EH) {
-		if (mgag200_calculate_mode_bandwidth(mode, max_bpp * 8) > (37500 * 1024))
-			return MODE_BAD;
-	} else if (mdev->type == G200_ER) {
-		if (mgag200_calculate_mode_bandwidth(mode, max_bpp * 8) > (55000 * 1024))
+	/*
+	 * Test the mode's required memory bandwidth if the device
+	 * specifies a maximum. Not all devices do though.
+	 */
+	if (info->max_mem_bandwidth) {
+		uint32_t mode_bandwidth = mgag200_calculate_mode_bandwidth(mode, max_bpp * 8);
+
+		if (mode_bandwidth > (info->max_mem_bandwidth * 1024))
 			return MODE_BAD;
 	}