[PATCH] drm/mipi_dbi: Fix off-by-one bugs in mipi_dbi_blank()

[PATCH] drm/mipi_dbi: Fix off-by-one bugs in mipi_dbi_blank()

[Geert Uytterhoeven]

When configuring the frame memory window, the last column and row
numbers are written to the column resp. page address registers.  These
numbers are thus one less than the actual window width resp. height.

While this is handled correctly in mipi_dbi_fb_dirty() since commit
03ceb1c8dfd1e293 ("drm/tinydrm: Fix setting of the column/page end
addresses."), it is not in mipi_dbi_blank().  The latter still forgets
to subtract one when calculating the most significant bytes of the
column and row numbers, thus programming wrong values when the display
width or height is a multiple of 256.

Fixes: 02dd95fe31693626 ("drm/tinydrm: Add MIPI DBI support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/gpu/drm/drm_mipi_dbi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_mipi_dbi.c b/drivers/gpu/drm/drm_mipi_dbi.c
index e34058c721becd6b..16bff1be4b8ac622 100644
--- a/drivers/gpu/drm/drm_mipi_dbi.c
+++ b/drivers/gpu/drm/drm_mipi_dbi.c
@@ -367,9 +367,9 @@ static void mipi_dbi_blank(struct mipi_dbi_dev *dbidev)
 	memset(dbidev->tx_buf, 0, len);
 
 	mipi_dbi_command(dbi, MIPI_DCS_SET_COLUMN_ADDRESS, 0, 0,
-			 (width >> 8) & 0xFF, (width - 1) & 0xFF);
+			 ((width - 1) >> 8) & 0xFF, (width - 1) & 0xFF);
 	mipi_dbi_command(dbi, MIPI_DCS_SET_PAGE_ADDRESS, 0, 0,
-			 (height >> 8) & 0xFF, (height - 1) & 0xFF);
+			 ((height - 1) >> 8) & 0xFF, (height - 1) & 0xFF);
 	mipi_dbi_command_buf(dbi, MIPI_DCS_WRITE_MEMORY_START,
 			     (u8 *)dbidev->tx_buf, len);
 
-- 
2.17.1

Re: [PATCH] drm/mipi_dbi: Fix off-by-one bugs in mipi_dbi_blank()

[Noralf Trønnes]

Den 30.12.2019 14.06, skrev Geert Uytterhoeven:
> When configuring the frame memory window, the last column and row
> numbers are written to the column resp. page address registers.  These
> numbers are thus one less than the actual window width resp. height.
> 
> While this is handled correctly in mipi_dbi_fb_dirty() since commit
> 03ceb1c8dfd1e293 ("drm/tinydrm: Fix setting of the column/page end
> addresses."), it is not in mipi_dbi_blank().  The latter still forgets
> to subtract one when calculating the most significant bytes of the
> column and row numbers, thus programming wrong values when the display
> width or height is a multiple of 256.
> 
> Fixes: 02dd95fe31693626 ("drm/tinydrm: Add MIPI DBI support")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---

Thanks, applied to drm-misc-next.

Noralf.