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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>
This commit is contained in:
Johannes H. Jensen 2017-11-05 15:46:53 +01:00 committed by Greg Kroah-Hartman
parent 0088d78251
commit be077edb46
1 changed files with 7 additions and 1 deletions
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8
drivers/staging/fbtft/fb_ssd1331.c
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@ -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 */