lcd clock

lcd clock

[Vanalme Filip]

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Hi,

Is there any specific reason why the (i.MX27) LCDC clocks are disabled in imxfb_probe() (drivers\imx.c) ?

#ifdef CONFIG_ARCH_IMX27
PCCR0 &= ~PCCR0_LCDC_EN;
PCCR1 &= ~PCCR1_HCLK_LCDC;
#endif

I would have expected the clocks to be enabled in that routine.

I'm experimenting a little with Barebox's 'bmp' command. Although the command did not return any error, I did not have any output on my lcd. Then I noticed that the LCDC clocks were not enabled. If the clocks were not enabled by default in the probe function, I would expect the enabling in the bmp command code, e.g. with FBIO_ENABLE ioctl command. But, as far as I can see, FBIO_ENABLE is not executed in the bmp command code.

Filip



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Re: lcd clock

[Juergen Beisert]

Vanalme Filip wrote:
> Is there any specific reason why the (i.MX27) LCDC clocks are disabled in
> imxfb_probe() (drivers\imx.c) ?
>
> #ifdef CONFIG_ARCH_IMX27
> PCCR0 &= ~PCCR0_LCDC_EN;
> PCCR1 &= ~PCCR1_HCLK_LCDC;
> #endif
>
> I would have expected the clocks to be enabled in that routine.
>
> I'm experimenting a little with Barebox's 'bmp' command. Although the
> command did not return any error, I did not have any output on my lcd. Then
> I noticed that the LCDC clocks were not enabled. If the clocks were not
> enabled by default in the probe function, I would expect the enabling in
> the bmp command code, e.g. with FBIO_ENABLE ioctl command. But, as far as I
> can see, FBIO_ENABLE is not executed in the bmp command code.

Try within barebox

fb0.enable=1

This should enable the LCD controller on demand.

jbe

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