On partial screen updates, SSD133X controllers expect to get the
rectangle addresses as arguments of the "Set Column Address" and "Set
Row Address" commands. Each command expects the start address and end
address of the row/column in absolute format, however the end
addresses were being sent in a relative format (relative to the start
address).
The relative end addresses work only when the start address is 0. In
those situations, there is no value difference between relative and
absolute addresses.
Fixes: b4299c936d8fd ("drm/ssd130x: Add support for the SSD133x OLED controller
family")
Cc: [email protected]
Signed-off-by: Amit Barzilai <[email protected]>
---
drivers/gpu/drm/solomon/ssd130x.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/solomon/ssd130x.c
b/drivers/gpu/drm/solomon/ssd130x.c
index fee35496a324..4e4b879d8b24 100644
--- a/drivers/gpu/drm/solomon/ssd130x.c
+++ b/drivers/gpu/drm/solomon/ssd130x.c
@@ -915,12 +915,12 @@ static int ssd133x_update_rect(struct ssd130x_device
*ssd130x,
*/
/* Set column start and end */
- ret = ssd130x_write_cmd(ssd130x, 3, SSD133X_SET_COL_RANGE, x, columns -
1);
+ ret = ssd130x_write_cmd(ssd130x, 3, SSD133X_SET_COL_RANGE, x, x +
columns - 1);
if (ret < 0)
return ret;
/* Set row start and end */
- ret = ssd130x_write_cmd(ssd130x, 3, SSD133X_SET_ROW_RANGE, y, rows - 1);
+ ret = ssd130x_write_cmd(ssd130x, 3, SSD133X_SET_ROW_RANGE, y, y + rows
- 1);
if (ret < 0)
return ret;
--
2.54.0
