[PATCH 6.1 085/131] iio: pressure: dps310: Adjust Timeout Settings

Greg Kroah-Hartman
2023-10-16T09:01:51Z

From: Lakshmi Yadlapati <lakshmiy@us.ibm.com>

commit 901a293fd96fb9bab843ba4cc7be3094a5aa7c94 upstream.

The DPS310 sensor chip has been encountering intermittent errors while
reading the sensor device across various system designs. This issue causes
the chip to become "stuck," preventing the indication of "ready" status
for pressure and temperature measurements in the MEAS_CFG register.

To address this issue, this commit fixes the timeout settings to improve
sensor stability:
- After sending a reset command to the chip, the timeout has been extended
from 2.5 ms to 15 ms, aligning with the DPS310 specification.
- The read timeout value of the MEAS_CFG register has been adjusted from
20ms to 30ms to match the specification.

Signed-off-by: Lakshmi Yadlapati <lakshmiy@us.ibm.com>
Fixes: 7b4ab4abcea4 ("iio: pressure: dps310: Reset chip after timeout")
Link: https://lore.kernel.org/r/20230829180222.3431926-2-lakshmiy@us.ibm.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/iio/pressure/dps310.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/iio/pressure/dps310.c
+++ b/drivers/iio/pressure/dps310.c
@@ -57,8 +57,8 @@
#define DPS310_RESET_MAGIC 0x09
#define DPS310_COEF_BASE 0x10

-/* Make sure sleep time is <= 20ms for usleep_range */
-#define DPS310_POLL_SLEEP_US(t) min(20000, (t) / 8)
+/* Make sure sleep time is <= 30ms for usleep_range */
+#define DPS310_POLL_SLEEP_US(t) min(30000, (t) / 8)
/* Silently handle error in rate value here */
#define DPS310_POLL_TIMEOUT_US(rc) ((rc) <= 0 ? 1000000 : 1000000 / (rc))

@@ -402,8 +402,8 @@ static int dps310_reset_wait(struct dps3
if (rc)
return rc;

- /* Wait for device chip access: 2.5ms in specification */
- usleep_range(2500, 12000);
+ /* Wait for device chip access: 15ms in specification */
+ usleep_range(15000, 55000);
return 0;
}