[PATCH] drm/format-helper: Make conversion_buf_size() support sub-byte pixel fmts

[Javier Martinez Canillas <javierm@redhat.com>]

There are DRM fourcc formats that have pixels smaller than a byte, but the
conversion_buf_size() function assumes that pixels are a multiple of bytes
and use the struct drm_format_info .cpp field to calculate the dst_pitch.

Instead, calculate it by using the bits per pixel (bpp) and char per pixel
(cpp) to account for formats that have sub-byte pixels.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
Tested by making sure that the following command still succeeds:

./tools/testing/kunit/kunit.py run \
--kunitconfig=drivers/gpu/drm/tests/.kunitconfig

 drivers/gpu/drm/tests/drm_format_helper_test.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
index 9536829c6e3a..f200347a1db7 100644
--- a/drivers/gpu/drm/tests/drm_format_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
@@ -409,12 +409,16 @@ static size_t conversion_buf_size(u32 dst_format, unsigned int dst_pitch,
 				  const struct drm_rect *clip)
 {
 	const struct drm_format_info *dst_fi = drm_format_info(dst_format);
+	unsigned int bpp, cpp;
 
 	if (!dst_fi)
 		return -EINVAL;
 
-	if (!dst_pitch)
-		dst_pitch = drm_rect_width(clip) * dst_fi->cpp[0];
+	if (!dst_pitch) {
+		bpp = drm_format_info_bpp(dst_fi, 0);
+		cpp = DIV_ROUND_UP(bpp, 8);
+		dst_pitch = DIV_ROUND_UP(drm_rect_width(clip) * bpp, 8);
+	}
 
 	return dst_pitch * drm_rect_height(clip);
 }
-- 
2.39.2