drm/ssd130x: Fix rectangle updates

The rectangle update functions ssd130x_fb_blit_rect() and
ssd130x_update_rect() do not behave correctly when x1 != 0 or y1 !=
0, or when y1 or y2 are not aligned to display page boundaries.
E.g. when used as a text console, only the first line of text is shown
on the display.

  1. The buffer passed by ssd130x_fb_blit_rect() points to the first
     byte of monochrome bitmap data, and thus has its origin at (x1,
     y1), while ssd130x_update_rect() assumes it is at (0, 0).
     Fix ssd130x_update_rect() by changing the vertical and horizontal
     loop ranges, and adding the offsets only when needed.

  2. In ssd130x_fb_blit_rect(), align y1 and y2 to the display page
     boundaries before doing the color conversion, so the full page
     is converted and updated.
     Remove the correction for an unaligned y1 from
     ssd130x_update_rect(), and add a check to make sure y1 is aligned.

Fixes: a61732e8 ("drm: Add driver for Solomon SSD130x OLED displays")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220317081830.1211400-4-geert@linux-m68k.org

drivers/gpu/drm/solomon/ssd130x.c

@@ -355,11 +355,14 @@ 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(y % 8 + height, 8);
+	unsigned int pages = DIV_ROUND_UP(height, 8);
+	struct drm_device *drm = &ssd130x->drm;
 	u32 array_idx = 0;
 	int ret, i, j, k;
 	u8 *data_array = NULL;
 
+	drm_WARN_ONCE(drm, y % 8 != 0, "y must be aligned to screen page\n");
+
 	data_array = kcalloc(width, pages, GFP_KERNEL);
 	if (!data_array)
 		return -ENOMEM;
@@ -401,13 +404,13 @@ static int ssd130x_update_rect(struct ssd130x_device *ssd130x, u8 *buf,
 	if (ret < 0)
 		goto out_free;
 
-	for (i = y / 8; i < y / 8 + pages; i++) {
+	for (i = 0; i < pages; i++) {
 		int m = 8;
 
 		/* Last page may be partial */
-		if (8 * (i + 1) > ssd130x->height)
+		if (8 * (y / 8 + i + 1) > ssd130x->height)
 			m = ssd130x->height % 8;
-		for (j = x; j < x + width; j++) {
+		for (j = 0; j < width; j++) {
 			u8 data = 0;
 
 			for (k = 0; k < m; k++) {
@@ -454,6 +457,10 @@ static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb, const struct dma_buf
 	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);
+
 	buf = kcalloc(fb->width, fb->height, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;