diff options
| author | John Keeping <jkeeping@inmusicbrands.com> | 2025-01-15 11:01:37 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-10 14:39:13 +0200 |
| commit | 5a3461ca54db8d9f337c9c6af4a415de28b4b595 (patch) | |
| tree | 3fb522f665a28ff4cb152c9ef7b3c0a803767a4d | |
| parent | a9c4366566e6f8f4b434bd62ce940cfcb07d0a54 (diff) | |
drm/ssd130x: fix ssd132x encoding
[ 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-jkeeping@inmusicbrands.com
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/gpu/drm/solomon/ssd130x.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c index 6f51bcf774e2..7d071a2f7a46 100644 --- a/drivers/gpu/drm/solomon/ssd130x.c +++ b/drivers/gpu/drm/solomon/ssd130x.c @@ -880,7 +880,7 @@ 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); } } |