5.15-stable review patch. If anyone has any objections, please let me know.
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From: Dumitru Ceclan mitrutzceclan@gmail.com
commit 96f9ab0d5933c1c00142dd052f259fce0bc3ced2 upstream.
The ad7124_soft_reset() function has the assumption that the chip will assert the "power-on reset" bit in the STATUS register after a software reset without any delay. The POR bit =0 is used to check if the chip initialization is done.
A chip ID mismatch probe error appears intermittently when the probe continues too soon and the ID register does not contain the expected value.
Fix by adding a 200us delay after the software reset command is issued.
Fixes: b3af341bbd96 ("iio: adc: Add ad7124 support") Signed-off-by: Dumitru Ceclan dumitru.ceclan@analog.com Reviewed-by: Nuno Sa nuno.sa@analog.com Link: https://patch.msgid.link/20240731-ad7124-fix-v1-1-46a76aa4b9be@analog.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/adc/ad7124.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/iio/adc/ad7124.c +++ b/drivers/iio/adc/ad7124.c @@ -690,6 +690,7 @@ static int ad7124_soft_reset(struct ad71 if (ret < 0) return ret;
+ fsleep(200); timeout = 100; do { ret = ad_sd_read_reg(&st->sd, AD7124_STATUS, 1, &readval);