* Igor Grinberg <grinberg@xxxxxxxxxxxxxx> [121119 08:06]:
> Commit 97ee9f01 (ARM: OMAP: fix the ads7846 init code) have enabled the
> pendown GPIO debounce time setting by the below sequence:
>
> gpio_request_one()
> gpio_set_debounce()
> gpio_free()
>
> It also revealed a bug in the OMAP GPIO handling code which prevented
> the GPIO debounce clock to be disabled and CORE transition to low power
> states.
>
> Commit c9c55d9 (gpio/omap: fix off-mode bug: clear debounce settings on
> free/reset) fixes the OMAP GPIO handling code by making sure that the
> GPIO debounce clock gets disabled if no GPIO is requested from current
> bank.
>
> While fixing the OMAP GPIO handling code (in the right way), the above
> commit makes the gpio_request->set_debounce->free sequence invalid as
> after freeing the GPIO, the debounce settings are lost.
>
> Fix the debounce settings by moving the debounce initialization to the
> actual GPIO requesting code - the ads7846 driver.
>
> Signed-off-by: Igor Grinberg <grinberg@xxxxxxxxxxxxxx>
> Cc: Kevin Hilman <khilman@xxxxxx>
> Cc: Zumeng Chen <zumeng.chen@xxxxxxxxxxxxx>
Acked-by: Tony Lindgren <tony@xxxxxxxxxxx>
> ---
> arch/arm/mach-omap2/common-board-devices.c | 34 ++++++++++++++++-----------
> 1 files changed, 20 insertions(+), 14 deletions(-)
>
> diff --git a/arch/arm/mach-omap2/common-board-devices.c b/arch/arm/mach-omap2/common-board-devices.c
> index ad85609..d246efd 100644
> --- a/arch/arm/mach-omap2/common-board-devices.c
> +++ b/arch/arm/mach-omap2/common-board-devices.c
> @@ -63,30 +63,36 @@ void __init omap_ads7846_init(int bus_num, int gpio_pendown, int gpio_debounce,
> struct spi_board_info *spi_bi = &ads7846_spi_board_info;
> int err;
>
> - err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
> - if (err) {
> - pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
> - return;
> - }
> + /*
> + * If a board defines get_pendown_state() function, request the pendown
> + * GPIO and set the GPIO debounce time.
> + * If a board does not define the get_pendown_state() function, then
> + * the ads7846 driver will setup the pendown GPIO itself.
> + */
> + if (board_pdata && board_pdata->get_pendown_state) {
> + err = gpio_request_one(gpio_pendown, GPIOF_IN, "TSPenDown");
> + if (err) {
> + pr_err("Couldn't obtain gpio for TSPenDown: %d\n", err);
> + return;
> + }
> +
> + if (gpio_debounce)
> + gpio_set_debounce(gpio_pendown, gpio_debounce);
>
> - if (gpio_debounce)
> - gpio_set_debounce(gpio_pendown, gpio_debounce);
> + gpio_export(gpio_pendown, 0);
> + }
>
> spi_bi->bus_num = bus_num;
> spi_bi->irq = gpio_to_irq(gpio_pendown);
>
> + ads7846_config.gpio_pendown = gpio_pendown;
> +
> if (board_pdata) {
> board_pdata->gpio_pendown = gpio_pendown;
> + board_pdata->gpio_pendown_debounce = gpio_debounce;
> spi_bi->platform_data = board_pdata;
> - if (board_pdata->get_pendown_state)
> - gpio_export(gpio_pendown, 0);
> - } else {
> - ads7846_config.gpio_pendown = gpio_pendown;
> }
>
> - if (!board_pdata || (board_pdata && !board_pdata->get_pendown_state))
> - gpio_free(gpio_pendown);
> -
> spi_register_board_info(&ads7846_spi_board_info, 1);
> }
> #else
> --
> 1.7.3.4
>
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