The DPS310 chip has been observed to get "stuck" such that pressure and temperature measurements are never indicated as "ready" in the MEAS_CFG register. The only solution is to reset the device and try again. In order to avoid continual failures, use a boolean flag to only try the reset after timeout once if errors persist. Include a patch to move the startup procedure into a function.
Changes since v7: - Condense the code a bit by dropping rc2
Changes since v6: - Use helper instead of the lengthy regmap_read_poll_timeout twice - Just return dps310_startup in dps310_reset_reinit
Changes since v5: - Completely rework the second patch to reset and reinit in any timeout condition, if there haven't been previous timeouts that failed to recover the chip.
Changes since v4: - Just check for rc rather than rc < 0 in some cases - Split declaration and init of rc
Changes since v3: - Don't check regmap* return codes for < 0 - Fix comment spelling
Changes since v2: - Add some comments - Fix the clunky control flow
Changes since v1: - Separate into two patches - Rename 'dps310_verify_meas_cfg' to 'dps310_check_reset_meas_cfg'
Eddie James (2): iio: pressure: dps310: Refactor startup procedure iio: pressure: dps310: Reset chip after timeout
drivers/iio/pressure/dps310.c | 262 +++++++++++++++++++++------------- 1 file changed, 163 insertions(+), 99 deletions(-)