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video: mxsfb: Fix reset hang when videomode variable is not present 

Currently the system hangs when the 'videomode' variable is not present
and a reset command is issued:

=> setenv videomode
=> saveenv
=> reset

(Board hangs)

lcdif_power_down() assumes that the LCDIF controller has been properly
configured and enabled, which may not be true.

To fix this issue check whether panel.frameAdrs has been initialized and
in case it has not been initialized, do not continue with the LCDIF
powerdown sequence.

Tested on a imx7dsabresd board.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Anatolij Gustschin <agust@denx.de>
This commit is contained in:
Fabio Estevam 2017-02-22 10:40:22 -03:00 committed by Anatolij Gustschin
parent 4d6f9e0d21
commit b24cf8540a
1 changed files with 3 additions and 0 deletions
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3
drivers/video/mxsfb.c
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@ -136,6 +136,9 @@ void lcdif_power_down(void)
struct mxs_lcdif_regs *regs = (struct mxs_lcdif_regs *)MXS_LCDIF_BASE;
int timeout = 1000000;
if (!panel.frameAdrs)
return;
writel(panel.frameAdrs, &regs->hw_lcdif_cur_buf_reg);
writel(panel.frameAdrs, &regs->hw_lcdif_next_buf_reg);
writel(LCDIF_CTRL1_VSYNC_EDGE_IRQ, &regs->hw_lcdif_ctrl1_clr);