Commit be077edb authored Nov 05, 2017 by Johannes H. Jensen Committed by Greg Kroah-Hartman Nov 06, 2017

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>

parent 0088d782

drivers/staging/fbtft/fb_ssd1331.c

+7 −1

Original line number	Diff line number	Diff line
		@@ -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 */