From 552f0cc72aadfc8657876ce310e7a8dc37529536 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Fri, 11 Jan 2013 14:31:43 -0800 Subject: [PATCH] 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 Cc: Brian Lilly Cc: Greg Kroah-Hartman Cc: Florian Tobias Schandinat Cc: Thomas Petazzoni Cc: Tomi Valkeinen Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/ssd1307fb.c | 4 ++-- 1 file 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); -- 2.34.1