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authorMaxime Ripard <maxime.ripard@free-electrons.com>2013-01-11 23:31:43 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2013-01-11 23:54:54 +0100
commit552f0cc72aadfc8657876ce310e7a8dc37529536 (patch)
tree0d7138471797e8b7b08f02621fac2b02790f6726 /drivers/video/ssd1307fb.c
parentmm: migrate: check page_count of THP before migrating (diff)
downloadlinux-552f0cc72aadfc8657876ce310e7a8dc37529536.tar.xz
linux-552f0cc72aadfc8657876ce310e7a8dc37529536.zip
drivers/video/ssd1307fb.c: fix bit order bug in the byte translation function
This was leading to a strange behaviour when using the fbcon driver on top of this one: the letters were in the right order, but each letter had a vertical symmetry. This was because the addressing was right for the byte, but the addressing of each individual bit was inverted. Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Brian Lilly <brian@crystalfontz.com> Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org> Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Cc: Thomas Petazzoni <thomas@free-electrons.com> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
-rw-r--r--drivers/video/ssd1307fb.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/video/ssd1307fb.c b/drivers/video/ssd1307fb.c
index 4d99dd7a6831..395cb6a8d8f3 100644
--- a/drivers/video/ssd1307fb.c
+++ b/drivers/video/ssd1307fb.c
@@ -145,8 +145,8 @@ static void ssd1307fb_update_display(struct ssd1307fb_par *par)
u32 page_length = SSD1307FB_WIDTH * i;
u32 index = page_length + (SSD1307FB_WIDTH * k + j) / 8;
u8 byte = *(vmem + index);
- u8 bit = byte & (1 << (7 - (j % 8)));
- bit = bit >> (7 - (j % 8));
+ u8 bit = byte & (1 << (j % 8));
+ bit = bit >> (j % 8);
buf |= bit << k;
}
ssd1307fb_write_data(par->client, buf);