* Tomi Valkeinen <tomi.valkeinen@xxxxxx> [131220 05:45]: > On 2013-12-20 13:48, Russell King - ARM Linux wrote: > > On Fri, Dec 20, 2013 at 11:27:01AM +0000, Russell King - ARM Linux wrote: > >> Maybe, but that's the problem - finding out what is missing. This is the > >> endless problem where things keep changing - it's very difficult to keep > >> a "working configuration" working because the config symbols keep changing. > >> > >> Also, bear in mind that there's many different variants of the LDP hardware > >> with stuff connected up in different ways (I'm aware that the keypad is > >> just randomly allocated). I wouldn't be surprised if this also applied > >> to how the backlight on the LCD was done. > > I need to cook up a patch for the gpio active-low problem. I tried to > figure out how to do it with the old GPIO API, but as far as I > understand, I have to do it manually in the driver (as it was done in > the old driver). > > > Or maybe this is getting buggered by the idiotic deferred probing... It > > seems that the GPIOs for controlling the LCD and backlight aren't even > > getting claimed if the DSS modules are built in: > > > > # cat /sys/kernel/debug/gpio > > ... > > GPIOs 238-255, platform/twl4030_gpio, twl4030, can sleep: > > # echo panel-dpi.0 > /sys/bus/platform/drivers/panel-dpi/unbind > > # echo panel-dpi.0 > /sys/bus/platform/drivers/panel-dpi/bind > > # cat /sys/kernel/debug/gpio > > ... > > GPIOs 238-255, platform/twl4030_gpio, twl4030, can sleep: > > gpio-245 (panel enable ) out lo > > gpio-253 (panel backlight ) out lo > > This looks odd... Presuming the panel device was probed successfully, it > should always get the gpios or return an error. Only if gpio_is_valid() > returns false for the gpio, it skips it and continues. But in this case, > the gpio number comes from the platform data, so it should always be valid. > > And if it wasn't probed successfully, then there shouldn't be a fb0. I bet that's it though. If the display is probed before twl4030 GPIO is initialized, the GPIO numbers will be 0. I'm using omap2plus_defconfig which has DSS built as modules. Regards, Tony -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
