On Sun, Aug 31, 2008 at 9:31 PM, stanley.miao
<stanley.miao@xxxxxxxxxxxxx> wrote:
>
> On Fri, 2008-08-29 at 21:18 +0530, arun c wrote:
>> Hi stanley,
>>
>> On Fri, Aug 29, 2008 at 5:58 PM, stanley.miao
>> <stanley.miao@xxxxxxxxxxxxx> wrote:
>> >
>> > I have tried. It is not backlight's problem.
>>
>> Try this out
>>
>> Boot with the working kernel after that soft reset the board and try
>> the non working image(git) and see what happens.
>>
>> If no success
>
> If yes, what should I do ? You seems to encounter this problem ever.
>
> After soft reset with the working kernel, the non-working kernel will
> work. It look like the initial process is incomplete.
Can you check DSS DATA pin voltages for both the kernel?
Procedure:
Write various data (white, red ,green ,blue etc.) and verify
the pin voltages.
>
> Thanks
> Stanley
>
>>
>> Try the below values in lcd_2430sdp.c
>>
>> #define ENABLE_VAUX3_DEDICATED 0x05
>> #define ENABLE_VAUX3_DEV_GRP 0xE0
>>
>> >
>> > 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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>> >> >
>> >> >
>> >>
>> >>
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