• Martyn Welch's avatar
    hwmon: (da9052) Increase sample rate when using TSI · b16918a5
    Martyn Welch authored
    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: 4f16cab1 ("hwmon: da9052: Add support for TSI channel")
    Signed-off-by: default avatarMartyn Welch <martyn.welch@collabora.co.uk>
    Acked-by: default avatarSteve Twiss <stwiss.opensource@diasemi.com>
    Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
    b16918a5
da9052-hwmon.c 14.4 KB