diff options
| author | Vignesh R <vigneshr@ti.com> | 2014-09-01 12:01:06 +0530 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2014-09-26 08:15:50 +0100 |
| commit | 6ac734d2242949f41eb1346ca0fd4ed010c937aa (patch) | |
| tree | 36f4d04a4bd6479a2310d8cc87d17888353993ec /drivers/mfd/ti_am335x_tscadc.c | |
| parent | a654f81640caa0bb648b0e45b792ba846c9bb02d (diff) | |
| download | lwn-6ac734d2242949f41eb1346ca0fd4ed010c937aa.tar.gz lwn-6ac734d2242949f41eb1346ca0fd4ed010c937aa.zip | |
mfd: ti_am335x_tscadc: Fix TSC operation after ADC continouous mode
After enabling and disabling ADC continuous mode via sysfs, ts_print_raw
fails to return any data. This is because when ADC is configured for
continuous mode, it disables touch screen steps.These steps are not
re-enabled when ADC continuous mode is disabled. Therefore existing values
of REG_SE needs to be cached before enabling continuous mode and
disabling touch screen steps and enabling ADC steps. The cached value
are to be restored to REG_SE once ADC is disabled.
Fixes: 7ca6740cd1cd ("mfd: input: iio: ti_amm335x: Rework TSC/ADC synchronization")
Cc: stable@vger.kernel.org # v3.13+
Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd/ti_am335x_tscadc.c')
| -rw-r--r-- | drivers/mfd/ti_am335x_tscadc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index dd4bf5816221..8b119ce20b93 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -53,7 +53,7 @@ void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tsadc, u32 val) unsigned long flags; spin_lock_irqsave(&tsadc->reg_lock, flags); - tsadc->reg_se_cache = val; + tsadc->reg_se_cache |= val; if (tsadc->adc_waiting) wake_up(&tsadc->reg_se_wait); else if (!tsadc->adc_in_use) @@ -96,6 +96,7 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc) void am335x_tsc_se_set_once(struct ti_tscadc_dev *tsadc, u32 val) { spin_lock_irq(&tsadc->reg_lock); + tsadc->reg_se_cache |= val; am335x_tscadc_need_adc(tsadc); tscadc_writel(tsadc, REG_SE, val); |