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authorJohannes H. Jensen <joh@pseudoberries.com>2017-11-05 15:46:53 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-11-06 16:44:05 +0100
commitbe077edb469b0c84efbb117af59c39b9ec6615b3 (patch)
treeaa43f42e876dbfaf0a1415fca8cde403300311e4 /drivers/staging/fbtft
parent0088d782518a208f7015f3c36799a31cc43ce315 (diff)
downloadlinux-be077edb469b0c84efbb117af59c39b9ec6615b3.tar.bz2
staging: fbtft: fb_ssd1331: fix mirrored display
When the row scan order is reversed (the default) we also need to reverse the column scan order. This was not done previously, resulting in a mirrored display. Also add support for 180 degree display rotation, in which case simply disable reversed row and column scan order. Tested on an Adafruit 0.96" mini Color OLED display. Signed-off-by: Johannes H. Jensen <joh@pseudoberries.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/fbtft')
-rw-r--r--drivers/staging/fbtft/fb_ssd1331.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/staging/fbtft/fb_ssd1331.c b/drivers/staging/fbtft/fb_ssd1331.c
index 9aa9864fcf30..e4a759b54ba0 100644
--- a/drivers/staging/fbtft/fb_ssd1331.c
+++ b/drivers/staging/fbtft/fb_ssd1331.c
@@ -26,7 +26,13 @@ static int init_display(struct fbtft_par *par)
par->fbtftops.reset(par);
write_reg(par, 0xae); /* Display Off */
- write_reg(par, 0xa0, 0x70 | (par->bgr << 2)); /* Set Colour Depth */
+
+ /* Set Column Address Mapping, COM Scan Direction and Colour Depth */
+ if (par->info->var.rotate == 180)
+ write_reg(par, 0xa0, 0x60 | (par->bgr << 2));
+ else
+ write_reg(par, 0xa0, 0x72 | (par->bgr << 2));
+
write_reg(par, 0x72); /* RGB colour */
write_reg(par, 0xa1, 0x00); /* Set Display Start Line */
write_reg(par, 0xa2, 0x00); /* Set Display Offset */