Commit d313a86d authored Apr 19, 2012 by Marek Vasut Committed by Florian Tobias Schandinat Apr 21, 2012

i.MX28: Shut down the LCD controller to avoid BootROM sampling bug



If there's some traffic on the LCD controller pads, the BootROM has trouble with
sampling the bootmode from these pads. The BootROM usually ends in a loop.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Chen Peter-B29397 <B29397@freescale.com>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Li Frank-B20596 <B20596@freescale.com>
Cc: Lin Tony-B19295 <B19295@freescale.com>
Cc: Linux FBDEV <linux-fbdev@vger.kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Shawn Guo <shawn.guo@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Subodh Nijsure <snijsure@grid-net.com>
Cc: Tony Lin <tony.lin@freescale.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Wolfgang Denk <wd@denx.de>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Tested-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

parent 2de06df4

drivers/video/mxsfb.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -880,6 +880,18 @@ static int __devexit mxsfb_remove(struct platform_device *pdev)
		return 0;
		}

		static void mxsfb_shutdown(struct platform_device *pdev)
		{
		struct fb_info *fb_info = platform_get_drvdata(pdev);
		struct mxsfb_info *host = to_imxfb_host(fb_info);

		/*
		* Force stop the LCD controller as keeping it running during reboot
		* might interfere with the BootROM's boot mode pads sampling.
		*/
		writel(CTRL_RUN, host->base + LCDC_CTRL + REG_CLR);
		}

		static struct platform_device_id mxsfb_devtype[] = {
		{
		.name = "imx23-fb",
		@@ -896,6 +908,7 @@ MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
		static struct platform_driver mxsfb_driver = {
		.probe = mxsfb_probe,
		.remove = __devexit_p(mxsfb_remove),
		.shutdown = mxsfb_shutdown,
		.id_table = mxsfb_devtype,
		.driver = {
		.name = DRIVER_NAME,