drm/ssd130x: Set the page height value in the device info data

The driver only supports OLED controllers that have a page height of 8 but
there are devices that have different page heights. So it is better to not
hardcode this value and instead have it as a per controller data value.
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230609170941.1150941-4-javierm@redhat.com

drivers/gpu/drm/solomon/ssd130x.c

@@ -102,6 +102,7 @@ const struct ssd130x_deviceinfo ssd130x_variants[] = {
 		.default_width = 132,
 		.default_height = 64,
 		.page_mode_only = 1,
+		.page_height = 8,
 	},
 	[SSD1305_ID] = {
 		.default_vcomh = 0x34,
@@ -109,6 +110,7 @@ const struct ssd130x_deviceinfo ssd130x_variants[] = {
 		.default_dclk_frq = 7,
 		.default_width = 132,
 		.default_height = 64,
+		.page_height = 8,
 	},
 	[SSD1306_ID] = {
 		.default_vcomh = 0x20,
@@ -117,6 +119,7 @@ const struct ssd130x_deviceinfo ssd130x_variants[] = {
 		.need_chargepump = 1,
 		.default_width = 128,
 		.default_height = 64,
+		.page_height = 8,
 	},
 	[SSD1307_ID] = {
 		.default_vcomh = 0x20,
@@ -125,6 +128,7 @@ const struct ssd130x_deviceinfo ssd130x_variants[] = {
 		.need_pwm = 1,
 		.default_width = 128,
 		.default_height = 39,
+		.page_height = 8,
 	},
 	[SSD1309_ID] = {
 		.default_vcomh = 0x34,
@@ -132,6 +136,7 @@ const struct ssd130x_deviceinfo ssd130x_variants[] = {
 		.default_dclk_frq = 10,
 		.default_width = 128,
 		.default_height = 64,
+		.page_height = 8,
 	}
 };
 EXPORT_SYMBOL_NS_GPL(ssd130x_variants, DRM_SSD130X);
@@ -437,7 +442,8 @@ static int ssd130x_update_rect(struct ssd130x_device *ssd130x, u8 *buf,
 	unsigned int width = drm_rect_width(rect);
 	unsigned int height = drm_rect_height(rect);
 	unsigned int line_length = DIV_ROUND_UP(width, 8);
-	unsigned int pages = DIV_ROUND_UP(height, 8);
+	unsigned int page_height = ssd130x->device_info->page_height;
+	unsigned int pages = DIV_ROUND_UP(height, page_height);
 	struct drm_device *drm = &ssd130x->drm;
 	u32 array_idx = 0;
 	int ret, i, j, k;
@@ -559,16 +565,17 @@ static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb, const struct iosys_m
 				struct drm_rect *rect)
 {
 	struct ssd130x_device *ssd130x = drm_to_ssd130x(fb->dev);
+	unsigned int page_height = ssd130x->device_info->page_height;
 	struct iosys_map dst;
 	unsigned int dst_pitch;
 	int ret = 0;
 	u8 *buf = NULL;
 
 	/* Align y to display page boundaries */
-	rect->y1 = round_down(rect->y1, 8);
-	rect->y2 = min_t(unsigned int, round_up(rect->y2, 8), ssd130x->height);
+	rect->y1 = round_down(rect->y1, page_height);
+	rect->y2 = min_t(unsigned int, round_up(rect->y2, page_height), ssd130x->height);
 
-	dst_pitch = DIV_ROUND_UP(drm_rect_width(rect), 8);
+	dst_pitch = DIV_ROUND_UP(drm_rect_width(rect), page_height);
 	buf = kcalloc(dst_pitch, drm_rect_height(rect), GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;

drivers/gpu/drm/solomon/ssd130x.h

@@ -39,6 +39,7 @@ struct ssd130x_deviceinfo {
 	u32 default_dclk_frq;
 	u32 default_width;
 	u32 default_height;
+	u32 page_height;
 	int need_pwm;
 	int need_chargepump;
 	bool page_mode_only;