diff options
| author | Lothar Waßmann <LW@KARO-electronics.de> | 2012-11-22 13:49:14 +0100 |
|---|---|---|
| committer | Shawn Guo <shawn.guo@linaro.org> | 2013-01-04 12:52:53 +0100 |
| commit | 6c1ecba8d84841277d68140ef485335d5be28485 (patch) | |
| tree | 9e490bd2d23f48ddd37e2caa1ac96c413e70b3c4 | |
| parent | ARM: dts: imx23-olinuxino: Fix IOMUX settings (diff) | |
| download | linux-6c1ecba8d84841277d68140ef485335d5be28485.tar.xz linux-6c1ecba8d84841277d68140ef485335d5be28485.zip | |
video: mxsfb: fix crash when unblanking the display
The VDCTRL4 register does not provide the MXS SET/CLR/TOGGLE feature.
The write in mxsfb_disable_controller() sets the data_cnt for the LCD
DMA to 0 which obviously means the max. count for the LCD DMA and
leads to overwriting arbitrary memory when the display is unblanked.
Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Acked-by: Juergen Beisert <jbe@pengutronix.de>
Tested-by: Lauri Hintsala <lauri.hintsala@bluegiga.net>
Cc: <stable@vger.kernel.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
| -rw-r--r-- | drivers/video/mxsfb.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/video/mxsfb.c b/drivers/video/mxsfb.c index 49619b441500..f2a49ef772f3 100644 --- a/drivers/video/mxsfb.c +++ b/drivers/video/mxsfb.c @@ -369,7 +369,8 @@ static void mxsfb_disable_controller(struct fb_info *fb_info) loop--; } - writel(VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4 + REG_CLR); + reg = readl(host->base + LCDC_VDCTRL4); + writel(reg & ~VDCTRL4_SYNC_SIGNALS_ON, host->base + LCDC_VDCTRL4); clk_disable_unprepare(host->clk); |