> -----Original Message-----
> From: Semwal, Sumit
> Sent: Tuesday, January 25, 2011 8:05 AM
> To: Hiremath, Vaibhav
> Cc: linux-omap@xxxxxxxxxxxxxxx; tony@xxxxxxxxxxx; tomi.valkeinen@xxxxxxxxx
> Subject: Re: [PATCH-V2] OMAP3EVM: Made backlight GPIO default state to off
>
> Vaibhav,
>
> On Tue, Jan 25, 2011 at 12:52 AM, Vaibhav Hiremath <hvaibhav@xxxxxx>
> wrote:
> > If you choose default output to DVI, the LCD backlight used to
> > stay on, since panel->disable function never gets called.
> >
> > So, during init put backlight GPIO to off state and the driver
> > code will decide which output to enable.
> >
> > Signed-off-by: Vaibhav Hiremath <hvaibhav@xxxxxx>
> > ---
> > Changes from V1 -
> > - Added check for return value
> >
> > arch/arm/mach-omap2/board-omap3evm.c | 15 +++++++++++++--
> > 1 files changed, 13 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm/mach-omap2/board-omap3evm.c b/arch/arm/mach-
> omap2/board-omap3evm.c
> > index 7119380..a888a7d 100644
> > --- a/arch/arm/mach-omap2/board-omap3evm.c
> > +++ b/arch/arm/mach-omap2/board-omap3evm.c
> > @@ -411,6 +411,8 @@ static struct platform_device leds_gpio = {
> > static int omap3evm_twl_gpio_setup(struct device *dev,
> > unsigned gpio, unsigned ngpio)
> > {
> > + int r;
> > +
> > /* gpio + 0 is "mmc0_cd" (input/IRQ) */
> > omap_mux_init_gpio(63, OMAP_PIN_INPUT);
> > mmc[0].gpio_cd = gpio + 0;
> > @@ -426,8 +428,17 @@ static int omap3evm_twl_gpio_setup(struct device
> *dev,
> > */
> >
> > /* TWL4030_GPIO_MAX + 0 == ledA, LCD Backlight control */
> > - gpio_request(gpio + TWL4030_GPIO_MAX, "EN_LCD_BKL");
> > - gpio_direction_output(gpio + TWL4030_GPIO_MAX, 0);
> > + r = gpio_request(gpio + TWL4030_GPIO_MAX, "EN_LCD_BKL");
> > + if (r)
> > + printk(KERN_ERR "failed to get lcd_bkl gpio\n");
> So even if the gpio_request fails, this code prints an error and
> continues?
[Hiremath, Vaibhav] yes, that's correct and intended.
Thanks,
Vaibhav
> > +
> > + if (get_omap3_evm_rev() >= OMAP3EVM_BOARD_GEN_2)
> > + r = gpio_direction_output(gpio + TWL4030_GPIO_MAX, 1);
> > + else
> > + r = gpio_direction_output(gpio + TWL4030_GPIO_MAX, 0);
> > +
> > + if (r)
> > + printk(KERN_ERR "failed to set direction of lcd_bkl
> gpio\n");
> >
> > /* gpio + 7 == DVI Enable */
> > gpio_request(gpio + 7, "EN_DVI");
> > --
> > 1.6.2.4
> >
> > --
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