[PATCH AUTOSEL 4.9 02/19] video: ssd1307fb: Start page range at page_offset

Sasha Levin sashal at kernel.org
Tue Sep 24 16:51:13 UTC 2019

From: Marko Kohtala <marko.kohtala at okoko.fi>

[ Upstream commit dd9782834dd9dde3624ff1acea8859f3d3e792d4 ]

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 at okoko.fi>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Rob Herring <robh+dt at kernel.org>
Cc: Daniel Vetter <daniel at ffwll.ch>
Cc: David Airlie <airlied at linux.ie>
Cc: Michal Vokáč <michal.vokac at ysoft.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie at samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190618074111.9309-4-marko.kohtala@okoko.fi
Signed-off-by: Sasha Levin <sashal at kernel.org>
 drivers/video/fbdev/ssd1307fb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index 2925d5ce8d3e5..1267b93c03bd0 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -430,7 +430,7 @@ static int ssd1307fb_init(struct ssd1307fb_par *par)
 	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;

More information about the dri-devel mailing list