Re: working LCD driver

Andrew Zabolotny wrote:

>On Thu, 26 Feb 2004 15:05:04 -0500
>Jamey Hicks <jamey.hicks@hp.com> wrote:
>
>
>
>>GPIO67 is connected to the PDWN#/GPIO4 signal on the MQ1178. It does
>>not control power to the chip or the LCD but apparently puts the
>>MQ1178 to sleep when set to 0. When the iPAQ goes to sleep, this
>>signal should be asserted (0) to save power.
>>
>>
>Aha, then we should not touch it h2200_lcd.c. I have fixed this and
>commited to CVS. This could be the cause of the black screen you're
>getting, Alain.
>
>One more question, then: if I understand correctly,
>GPIO_NR_H2200_LCD_RESET_N binds to POR# pin of MediaQ, which is active
>low (that's why it is _N). Why it is needed? To say so, why we may want
>to reset the MediaQ when we can power off it and then power on with the
>same result? :)
>
I do not know the answer to that question. It might be that the pwdn#
pin cuts power consumption but does not reset the registers.

Jamey
Received on Thu Feb 26 20:44:08 2004