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

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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>
This commit is contained in:
Marek Vasut 2012-04-19 20:31:02 +02:00 committed by Florian Tobias Schandinat
parent 2de06df49f
commit d313a86d2e
1 changed files with 13 additions and 0 deletions
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13
drivers/video/mxsfb.c
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@ -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,