I have tried. It is not backlight's problem.
I found that only green color was showed, red and blue were filtered. So
the picture looked green and dark.
The color mode is RGB565. I wrote 0x07e0, 0xffe0, and 0xffff to /dev/fb0
respectively. All of them are showed to the same color, it's green.
I am using the latest code from source.mvista.com on omap3430sdp. Does
anybody encounter this problem ?
Thanks
Stanley.
On Wed, 2008-08-27 at 19:57 +0530, iqbal wrote:
> > The linux bootup logo is green, and LCD is dark. It looks like backlight
> > disabled.
> >
> > I commented the following two sentences in lcd_2430.c, there is still
> > the same thing. It seems these two sentences doesn't work.
> >
> > 96 omap_set_gpio_dataout(enable_gpio, 1);
> > 97 omap_set_gpio_dataout(backlight_gpio, 1);
> >
> > Both the the latest kernels from omapzoom.org and linux-omap-2.6 have
> > this problem. However, the old version in linux-omap-2.6, 2.6.21,
> > doesn't have this problem.
> >
> > Stanley.
>
> If I use this piece of code in panel suspend and resume, I see that the panel
> backlight is going off on suspend and comes back while calling resume. Give a
> try .
>
> static int sdp2430_panel_suspend(struct platform_device *pdev, pm_message_t mesg)
> {
> + omap_set_gpio_dataout(backlight_gpio, 0);
> + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,0x0,
> + TWL4030_VPLL2_DEDICATED);
> + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,0x0,
> + TWL4030_VPLL2_DEV_GRP);
> + mdelay(4);
> return 0;
> }
>
> static int sdp2430_panel_resume(struct platform_device *pdev)
> {
> + if (lcd_in_use)
> + return 0;
> + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
> + ENABLE_VPLL2_DEDICATED,TWL4030_VPLL2_DEDICATED);
> + twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
> + ENABLE_VPLL2_DEV_GRP,TWL4030_VPLL2_DEV_GRP);
> + omap_set_gpio_dataout(backlight_gpio, 1);
> +
> return 0;
> }
>
> >
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