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| author | Martyn Welch <martyn.welch@collabora.co.uk> | 2017-10-19 16:51:44 +0100 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2017-10-21 09:03:29 -0700 |
| commit | b16918a5fd87983d421a7e2241a1314e877c4ea2 (patch) | |
| tree | dedd75860f16877654114ed7cf3784b1514ce1bd /drivers/hwmon/da9052-hwmon.c | |
| parent | 8a5776a5f49812d29fe4b2d0a2d71675c3facf3f (diff) | |
| download | blackbird-op-linux-b16918a5fd87983d421a7e2241a1314e877c4ea2.tar.gz blackbird-op-linux-b16918a5fd87983d421a7e2241a1314e877c4ea2.zip | |
hwmon: (da9052) Increase sample rate when using TSI
The TSI channel, which is usually used for touchscreen support, but can
be used as 4 general purpose ADCs. When used as a touchscreen interface
the touchscreen driver switches the device into 1ms sampling mode (rather
than the default 10ms economy mode) as recommended by the manufacturer.
When using the TSI channels as a general purpose ADC we are currently not
doing this and testing suggests that this can result in ADC timeouts:
[ 5827.198289] da9052 spi2.0: timeout waiting for ADC conversion interrupt
[ 5827.728293] da9052 spi2.0: timeout waiting for ADC conversion interrupt
[ 5993.808335] da9052 spi2.0: timeout waiting for ADC conversion interrupt
[ 5994.328441] da9052 spi2.0: timeout waiting for ADC conversion interrupt
[ 5994.848291] da9052 spi2.0: timeout waiting for ADC conversion interrupt
Switching to the 1ms timing resolves this issue.
Fixes: 4f16cab19a3d5 ("hwmon: da9052: Add support for TSI channel")
Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Acked-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/da9052-hwmon.c')
| -rw-r--r-- | drivers/hwmon/da9052-hwmon.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c index 97a62f5b9ea4..a973eb6a2890 100644 --- a/drivers/hwmon/da9052-hwmon.c +++ b/drivers/hwmon/da9052-hwmon.c @@ -477,6 +477,11 @@ static int da9052_hwmon_probe(struct platform_device *pdev) /* disable touchscreen features */ da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00); + /* Sample every 1ms */ + da9052_reg_update(hwmon->da9052, DA9052_ADC_CONT_REG, + DA9052_ADCCONT_ADCMODE, + DA9052_ADCCONT_ADCMODE); + err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, "tsiready-irq", da9052_tsi_datardy_irq, hwmon); |
