• Sebastian Andrzej Siewior's avatar
    mfd: input: iio: ti_amm335x: Rework TSC/ADC synchronization · 7ca6740c
    Sebastian Andrzej Siewior authored
    The ADC driver always programs all possible ADC values and discards
    them except for the value IIO asked for. On the am335x-evm the driver
    programs four values and it takes 500us to gather them. Reducing the number
    of conversations down to the (required) one also reduces the busy loop down
    to 125us.
    
    This leads to another error, namely the FIFOCOUNT register is sometimes
    (like one out of 10 attempts) not updated in time leading to EBUSY.
    The next read has the FIFOCOUNT register updated.
    Checking for the ADCSTAT register for being idle isn't a good choice either.
    The problem is that if TSC is used at the same time, the HW completes the
    conversation for ADC *and* before the driver noticed it, the HW begins to
    perform a TSC conversation and so the driver never seen the HW idle. The
    next time we would have two values in the FIFO but since the driver reads
    everything we always see the current one.
    So instead of polling for the IDLE bit in ADCStatus register, we should
    check the FIFOCOUNT register. It should be one instead of zero because we
    request one value.
    
    This change in turn leads to another error. Sometimes if TSC & ADC are
    used together the TSC starts generating interrupts even if nobody
    actually touched the touchscreen. The interrupts seem valid because TSC's
    FIFO is filled with values for each channel of the TSC. This condition stops
    after a few ADC reads but will occur again. Not good.
    
    On top of this (even without the changes I just mentioned) there is a ADC
    & TSC lockup condition which was reported to me by Jeff Lance including the
    following test case:
    A busy loop of "cat /sys/bus/iio/devices/iio\:device0/in_voltage4_raw"
    and a mug on touch screen. With this setup, the hardware will lockup after
    something between 20 minutes and it could take up to a couple of hours.
    During that lockup, the ADCSTAT register says 0x30 (or 0x70) which means
    STEP_ID = IDLE and FSM_BUSY = yes. That means the hardware says that it is
    idle and busy at the same time which is an invalid condition.
    
    For all this reasons I decided to rework this TSC/ADC part and add a
    handshake / synchronization here:
    First the ADC signals that it needs the HW and writes a 0 mask into the
    SE register. The HW (if active) will complete the current conversation
    and become idle. The TSC driver will gather the values from the FIFO
    (woken up by an interrupt) and won't "enable" another conversation.
    Instead it will wake up the ADC driver which is already waiting. The ADC
    driver will start "its" conversation and once it is done, it will
    enable the TSC steps so the TSC will work again.
    
    After this rework I haven't observed the lockup so far. Plus the busy
    loop has been reduced from 500us to 125us.
    
    The continues-read mode remains unchanged.
    Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
    Acked-by: default avatarJonathan Cameron <jic23@kernel.org>
    Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
    7ca6740c
ti_am335x_tscadc.c 9.97 KB