drm/repaper: Use format helper for xrgb8888 to monochrome conversion

There is now a drm_fb_xrgb8888_to_mono_reversed() helper function to do
format conversion from XRGB8888 to reversed monochrome.

Use that helper and remove the open coded version in the repaper driver.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220223193735.213185-1-javierm@redhat.com

diff --git a/drivers/gpu/drm/tiny/repaper.c b/drivers/gpu/drm/tiny/repaper.c
index 97a775c48cea7750a5ae4ab31e00ba70d5b0d0ed..5c74e236b16ddd9d7656a2e357ca0d15ada5ca5e 100644 (file)
--- a/drivers/gpu/drm/tiny/repaper.c
+++ b/drivers/gpu/drm/tiny/repaper.c
@@ -508,26 +508,6 @@ static void repaper_get_temperature(struct repaper_epd *epd)
        epd->factored_stage_time = epd->stage_time * factor10x / 10;
 }
 
-static void repaper_gray8_to_mono_reversed(u8 *buf, u32 width, u32 height)
-{
-       u8 *gray8 = buf, *mono = buf;
-       int y, xb, i;
-
-       for (y = 0; y < height; y++)
-               for (xb = 0; xb < width / 8; xb++) {
-                       u8 byte = 0x00;
-
-                       for (i = 0; i < 8; i++) {
-                               int x = xb * 8 + i;
-
-                               byte >>= 1;
-                               if (gray8[y * width + x] >> 7)
-                                       byte |= BIT(7);
-                       }
-                       *mono++ = byte;
-               }
-}
-
 static int repaper_fb_dirty(struct drm_framebuffer *fb)
 {
        struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
@@ -560,12 +540,10 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb)
        if (ret)
                goto out_free;
 
-       drm_fb_xrgb8888_to_gray8(buf, 0, cma_obj->vaddr, fb, &clip);
+       drm_fb_xrgb8888_to_mono_reversed(buf, 0, cma_obj->vaddr, fb, &clip);
 
        drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
 
-       repaper_gray8_to_mono_reversed(buf, fb->width, fb->height);
-
        if (epd->partial) {
                repaper_frame_data_repeat(epd, buf, epd->current_frame,
                                          REPAPER_NORMAL);