6.13-stable review patch. If anyone has any objections, please let me know.
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From: John Keeping jkeeping@inmusicbrands.com
[ Upstream commit 1e14484677c8e87548f5f0d4eb8800e408004404 ]
The ssd132x buffer is encoded one pixel per nibble, with two pixels in each byte. When encoding an 8-bit greyscale input, take the top 4-bits as the value and ensure the two pixels are distinct and do not overwrite each other.
Fixes: fdd591e00a9c ("drm/ssd130x: Add support for the SSD132x OLED controller family") Signed-off-by: John Keeping jkeeping@inmusicbrands.com Reviewed-by: Javier Martinez Canillas javierm@redhat.com Link: https://patchwork.freedesktop.org/patch/msgid/20250115110139.1672488-2-jkeep... Signed-off-by: Javier Martinez Canillas javierm@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/solomon/ssd130x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c index 486d8f5282f93..4ceccad91ba0b 100644 --- a/drivers/gpu/drm/solomon/ssd130x.c +++ b/drivers/gpu/drm/solomon/ssd130x.c @@ -881,7 +881,7 @@ static int ssd132x_update_rect(struct ssd130x_device *ssd130x, u8 n1 = buf[i * width + j]; u8 n2 = buf[i * width + j + 1];
- data_array[array_idx++] = (n2 << 4) | n1; + data_array[array_idx++] = (n2 & 0xf0) | (n1 >> 4); } }