From mboxrd@z Thu Jan 1 00:00:00 1970 From: zumeng.chen@windriver.com (Zumeng Chen) Date: Thu, 14 Jun 2012 16:18:29 +0800 Subject: [PATCH V2 5/5] Input: ads7846: set proper debounce time in driver level In-Reply-To: <4FD99B91.9030705@compulab.co.il> References: <1339551850-20827-1-git-send-email-zumeng.chen@gmail.com> <1339551850-20827-6-git-send-email-zumeng.chen@gmail.com> <79CD15C6BA57404B839C016229A409A83EA4F07F@DBDE01.ent.ti.com> <4FD96CBF.5040106@windriver.com> <4FD98856.8070601@compulab.co.il> <4FD98DDA.9050806@windriver.com> <4FD99B91.9030705@compulab.co.il> Message-ID: <4FD99E55.80603@windriver.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org ? 2012?06?14? 16:06, Igor Grinberg ??: > On 06/14/12 10:08, Zumeng Chen wrote: >> ? 2012?06?14? 14:44, Igor Grinberg ??: >>> On 06/14/12 07:46, Zumeng Chen wrote: >>>>> ? 2012?06?13? 20:18, Hiremath, Vaibhav ??: >>>>>>> On Wed, Jun 13, 2012 at 07:14:10, Zumeng Chen wrote: >>>>>>>>> From: Zumeng Chen >>>>>>>>> >>>>>>>>> If we don't set proper debouce time for ads7846, then there are >>>>>>>>> flooded interrupt counters of ads7846 responding to one time >>>>>>>>> touch on screen, so the driver couldn't work well. >>>>>>>>> >>>>>>>>> And since most OMAP3 series boards pass NULL pointer of board_pdata >>>>>>>>> to omap_ads7846_init, so it's more proper to set it in driver level >>>>>>>>> after having gpio_request done. >>>>>>>>> >>>>>>>>> This patch has been validated on 3530evm. >>>>>>>>> >>>>>>>>> Signed-off-by: Zumeng Chen >>>>>>>>> Signed-off-by: Syed Mohammed Khasim >>>>>>>>> --- >>>>>>>>> drivers/input/touchscreen/ads7846.c | 4 ++++ >>>>>>>>> 1 files changed, 4 insertions(+), 0 deletions(-) >>>>>>>>> >>>>>>>>> diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c >>>>>>>>> index f02028e..459ff29 100644 >>>>>>>>> --- a/drivers/input/touchscreen/ads7846.c >>>>>>>>> +++ b/drivers/input/touchscreen/ads7846.c >>>>>>>>> @@ -980,6 +980,10 @@ static int __devinit ads7846_setup_pendown(struct spi_device *spi, struct ads784 >>>>>>>>> } >>>>>>>>> >>>>>>>>> ts->gpio_pendown = pdata->gpio_pendown; >>>>>>>>> +#ifdef CONFIG_ARCH_OMAP3 >>>>>>>>> + /* 310 means about 10 microsecond for omap3 */ >>>>>>>>> + gpio_set_debounce(pdata->gpio_pendown, 310); >>>>>>>>> +#endif >>>>>>>>> >>>>>>> Zumeng, >>>>>>> >>>>>>> With my sign-off you are changing the original code, that too >>>>>>> without my sign-off and ack. >>>>>>> I wouldn't mind you to submit patches from my tree, but the expectation is >>>>>>> if you are changing the original code, it should be under your sign-off. >>>>> Thanks, good to learn. I'll remove in next time. >>>>>>> Coming to the patch, #ifdef in driver is not recommended, and this 10msec >>>>>>> delay is specific to OMAP GPIO and driver should not be aware of this, >>>>>>> that's where you will find the original patch handling it in board file. >>>>> According to the git blame of the board-omap3evm.c I think >>>>> 96974a24 did a good thing to all the related codes for omap3 >>>>> boards. So I think we can call board and driver as BSP level :-) >>>>> >>>>> If #ifdef in driver can save many codes, I guess it's deserved. >>> No, platform/board specific ifdefs in the generic driver code are never >>> deserved. >>> How about the attached patch, does it fix the problem for you? >> Sorry Igor, I just read your patch, yes, most are there, and we >> just have to set get_pendown_state as you early said. Really >> *thanks* for your drive :) > No, with my patch, you don't need the get_pendown_state() and > you don't need to change the board-omap3evm.c ADS7846 related code. > So, I'm going to submit my patch properly. Feel free to do that >> Regards, >> Zumeng >>> -- Regards, Igor. >>> ads7846.patch >>> >>> >>> diff --git a/arch/arm/mach-omap2/common-board-devices.c b/arch/arm/mach-omap2/common-board-devices.c >>> index 1706ebc..c187586 100644 >>> --- a/arch/arm/mach-omap2/common-board-devices.c >>> +++ b/arch/arm/mach-omap2/common-board-devices.c >>> @@ -63,28 +63,30 @@ 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; >>> >>> - 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; >>> - } >>> - gpio_export(gpio_pendown, 0); >>> - >>> - if (gpio_debounce) >>> - gpio_set_debounce(gpio_pendown, gpio_debounce); >>> + 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); >>> + >>> spi_bi->bus_num = bus_num; >>> spi_bi->irq = gpio_to_irq(gpio_pendown); >>> >>> if (board_pdata) { >>> board_pdata->gpio_pendown = gpio_pendown; >>> 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