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| author | Marek Vasut <marek.vasut@gmail.com> | 2009-08-20 22:05:53 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2009-08-21 00:53:12 -0700 |
| commit | 1700f5fde88f9a251037bc86bde538ee32c59905 (patch) | |
| tree | aceddbec1e1c3916fe4a5fd20ab3f2a2de3e362a | |
| parent | 3b7307c2d66dd575ef24b88898b4bc4bddb254f4 (diff) | |
| download | linux-3.10-1700f5fde88f9a251037bc86bde538ee32c59905.tar.gz linux-3.10-1700f5fde88f9a251037bc86bde538ee32c59905.tar.bz2 linux-3.10-1700f5fde88f9a251037bc86bde538ee32c59905.zip | |
Input: ucb1400_ts - enable ADC Filter
This patch enables ADC filtering on UCB1400 codec by default. The
benefit from this change is mostly on some Colibri boards where
the ADCSYNC pin of the UCB1400 codec isn't connected causing the
touchscreen to jitter very badly. This change has no visible
effect on boards where the ADCSYNC pin is connected.
Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Tested-by: Palo Revak <palo@bielyvlk.sk>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
| -rw-r--r-- | drivers/input/touchscreen/ucb1400_ts.c | 9 | ||||
| -rw-r--r-- | include/linux/ucb1400.h | 4 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/ucb1400_ts.c b/drivers/input/touchscreen/ucb1400_ts.c index 6954f550010..3b345f9cf0c 100644 --- a/drivers/input/touchscreen/ucb1400_ts.c +++ b/drivers/input/touchscreen/ucb1400_ts.c @@ -345,6 +345,7 @@ static int ucb1400_ts_detect_irq(struct ucb1400_ts *ucb) static int ucb1400_ts_probe(struct platform_device *dev) { int error, x_res, y_res; + u16 fcsr; struct ucb1400_ts *ucb = dev->dev.platform_data; ucb->ts_idev = input_allocate_device(); @@ -382,6 +383,14 @@ static int ucb1400_ts_probe(struct platform_device *dev) ucb->ts_idev->evbit[0] = BIT_MASK(EV_ABS) | BIT_MASK(EV_KEY); ucb->ts_idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + /* + * Enable ADC filter to prevent horrible jitter on Colibri. + * This also further reduces jitter on boards where ADCSYNC + * pin is connected. + */ + fcsr = ucb1400_reg_read(ucb->ac97, UCB_FCSR); + ucb1400_reg_write(ucb->ac97, UCB_FCSR, fcsr | UCB_FCSR_AVE); + ucb1400_adc_enable(ucb->ac97); x_res = ucb1400_ts_read_xres(ucb); y_res = ucb1400_ts_read_yres(ucb); diff --git a/include/linux/ucb1400.h b/include/linux/ucb1400.h index ed889f4168f..ae779bb8cc0 100644 --- a/include/linux/ucb1400.h +++ b/include/linux/ucb1400.h @@ -73,6 +73,10 @@ #define UCB_ADC_DATA 0x68 #define UCB_ADC_DAT_VALID (1 << 15) + +#define UCB_FCSR 0x6c +#define UCB_FCSR_AVE (1 << 12) + #define UCB_ADC_DAT_MASK 0x3ff #define UCB_ID 0x7e |