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Date:	Sat, 08 Nov 2014 12:29:44 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	Vignesh R <vigneshr@...com>, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Benoit Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Hartmut Knaack <knaack.h@....de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Lee Jones <lee.jones@...aro.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Felipe Balbi <balbi@...com>, Brad Griffis <bgriffis@...com>,
	Sanjeev Sharma <sanjeev_sharma@...tor.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Jan Kardell <jan.kardell@...liq.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-iio@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH 1/5] input: touchscreen: ti_am335x_tsc Interchange touchscreen
 and ADC steps

On 07/11/14 05:49, Vignesh R wrote:
> From: Brad Griffis <bgriffis@...com>
> 
> This patch makes the initial changes required to workaround TSC-false
> pen-up interrupts. It is required to implement these changes in order to
> remove udelay in the TSC interrupt handler and false pen-up events.
> The charge step is to be executed immediately after sampling X+. Hence
> TSC is made to use higher numbered steps (steps 5 to 16 for 5 co-ordinate
> readouts, 4 wire TSC configuration) and ADC to use lower ones. Further
> X co-ordinate readouts must be the last to be sampled, thus co-ordinates
> are sampled in the order Y-Z-X.
> 
> Signed-off-by: Brad Griffis <bgriffis@...com>
> [vigneshr@...com: Ported the patch from v3.12 to v3.18rc2]
> 
> Signed-off-by: Vignesh R <vigneshr@...com>
For the tiny bit in IIO
Acked-by: Jonathan Cameron <jic23@...nel.org>

All yours Lee/Dmitry.

Jonathan
> ---
>  drivers/iio/adc/ti_am335x_adc.c           |  5 ++--
>  drivers/input/touchscreen/ti_am335x_tsc.c | 42 ++++++++++++++++++-------------
>  2 files changed, 26 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
> index b730864731e8..adba23246474 100644
> --- a/drivers/iio/adc/ti_am335x_adc.c
> +++ b/drivers/iio/adc/ti_am335x_adc.c
> @@ -86,19 +86,18 @@ static void tiadc_step_config(struct iio_dev *indio_dev)
>  {
>  	struct tiadc_device *adc_dev = iio_priv(indio_dev);
>  	unsigned int stepconfig;
> -	int i, steps;
> +	int i, steps = 0;
>  
>  	/*
>  	 * There are 16 configurable steps and 8 analog input
>  	 * lines available which are shared between Touchscreen and ADC.
>  	 *
> -	 * Steps backwards i.e. from 16 towards 0 are used by ADC
> +	 * Steps forwards i.e. from 0 towards 16 are used by ADC
>  	 * depending on number of input lines needed.
>  	 * Channel would represent which analog input
>  	 * needs to be given to ADC to digitalize data.
>  	 */
>  
> -	steps = TOTAL_STEPS - adc_dev->channels;
>  	if (iio_buffer_enabled(indio_dev))
>  		stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1
>  					| STEPCONFIG_MODE_SWCNT;
> diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
> index 2ce649520fe0..1aeac9675fe7 100644
> --- a/drivers/input/touchscreen/ti_am335x_tsc.c
> +++ b/drivers/input/touchscreen/ti_am335x_tsc.c
> @@ -121,7 +121,7 @@ static void titsc_step_config(struct titsc *ts_dev)
>  {
>  	unsigned int	config;
>  	int i;
> -	int end_step;
> +	int end_step, first_step, tsc_steps;
>  	u32 stepenable;
>  
>  	config = STEPCONFIG_MODE_HWSYNC |
> @@ -140,9 +140,11 @@ static void titsc_step_config(struct titsc *ts_dev)
>  		break;
>  	}
>  
> -	/* 1 … coordinate_readouts is for X */
> -	end_step = ts_dev->coordinate_readouts;
> -	for (i = 0; i < end_step; i++) {
> +	tsc_steps = ts_dev->coordinate_readouts * 2 + 2;
> +	first_step = TOTAL_STEPS - tsc_steps;
> +	/* Steps 16 to 16-coordinate_readouts is for X */
> +	end_step = first_step + tsc_steps;
> +	for (i = end_step - ts_dev->coordinate_readouts; i < end_step; i++) {
>  		titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
>  		titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
>  	}
> @@ -164,9 +166,9 @@ static void titsc_step_config(struct titsc *ts_dev)
>  		break;
>  	}
>  
> -	/* coordinate_readouts … coordinate_readouts * 2 is for Y */
> -	end_step = ts_dev->coordinate_readouts * 2;
> -	for (i = ts_dev->coordinate_readouts; i < end_step; i++) {
> +	/* 1 ... coordinate_readouts is for Y */
> +	end_step = first_step + ts_dev->coordinate_readouts;
> +	for (i = first_step; i < end_step; i++) {
>  		titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
>  		titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
>  	}
> @@ -179,7 +181,7 @@ static void titsc_step_config(struct titsc *ts_dev)
>  	titsc_writel(ts_dev, REG_CHARGECONFIG, config);
>  	titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY);
>  
> -	/* coordinate_readouts * 2 … coordinate_readouts * 2 + 2 is for Z */
> +	/* coordinate_readouts + 1 ... coordinate_readouts + 2 is for Z */
>  	config = STEPCONFIG_MODE_HWSYNC |
>  			STEPCONFIG_AVG_16 | ts_dev->bit_yp |
>  			ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM |
> @@ -194,8 +196,11 @@ static void titsc_step_config(struct titsc *ts_dev)
>  	titsc_writel(ts_dev, REG_STEPDELAY(end_step),
>  			STEPCONFIG_OPENDLY);
>  
> -	/* The steps1 … end and bit 0 for TS_Charge */
> -	stepenable = (1 << (end_step + 2)) - 1;
> +	/* The steps end ... end - readouts * 2 + 2 and bit 0 for TS_Charge */
> +	stepenable = 1;
> +	for (i = 0; i < tsc_steps; i++)
> +		stepenable |= 1 << (first_step + i + 1);
> +
>  	ts_dev->step_mask = stepenable;
>  	am335x_tsc_se_set_cache(ts_dev->mfd_tscadc, ts_dev->step_mask);
>  }
> @@ -209,6 +214,7 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
>  	unsigned int read, diff;
>  	unsigned int i, channel;
>  	unsigned int creads = ts_dev->coordinate_readouts;
> +	unsigned int first_step = TOTAL_STEPS - (creads * 2 + 2);
>  
>  	*z1 = *z2 = 0;
>  	if (fifocount % (creads * 2 + 2))
> @@ -226,7 +232,7 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
>  
>  		channel = (read & 0xf0000) >> 16;
>  		read &= 0xfff;
> -		if (channel < creads) {
> +		if (channel > first_step + creads + 2) {
>  			diff = abs(read - prev_val_x);
>  			if (diff < prev_diff_x) {
>  				prev_diff_x = diff;
> @@ -234,19 +240,19 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
>  			}
>  			prev_val_x = read;
>  
> -		} else if (channel < creads * 2) {
> +		} else if (channel == first_step + creads + 1) {
> +			*z1 = read;
> +
> +		} else if (channel == first_step + creads + 2) {
> +			*z2 = read;
> +
> +		} else if (channel > first_step) {
>  			diff = abs(read - prev_val_y);
>  			if (diff < prev_diff_y) {
>  				prev_diff_y = diff;
>  				*y = read;
>  			}
>  			prev_val_y = read;
> -
> -		} else if (channel < creads * 2 + 1) {
> -			*z1 = read;
> -
> -		} else if (channel < creads * 2 + 2) {
> -			*z2 = read;
>  		}
>  	}
>  }
> 

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