[PATCH 3.16 07/72] video: ssd1307fb: Start page range at page_offset

From: Ben Hutchings
Date: Sun Dec 08 2019 - 08:58:58 EST

3.16.79-rc1 review patch. If anyone has any objections, please let me know.


From: Marko Kohtala <marko.kohtala@xxxxxxxx>

commit dd9782834dd9dde3624ff1acea8859f3d3e792d4 upstream.

The page_offset was only applied to the end of the page range. This caused
the display updates to cause a scrolling effect on the display because the
amount of data written to the display did not match the range display

Fixes: 301bc0675b67 ("video: ssd1307fb: Make use of horizontal addressing mode")
Signed-off-by: Marko Kohtala <marko.kohtala@xxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Michal VokÃÄ <michal.vokac@xxxxxxxxx>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20190618074111.9309-4-marko.kohtala@xxxxxxxx
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
drivers/video/fbdev/ssd1307fb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -426,7 +426,7 @@ static int ssd1307fb_ssd1306_init(struct
if (ret < 0)
return ret;

- ret = ssd1307fb_write_cmd(par->client, 0x0);
+ ret = ssd1307fb_write_cmd(par->client, par->page_offset);
if (ret < 0)
return ret;