This is a note to let you know that I've just added the patch titled
iio: ltc2497: Fix reading conversion results
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-ltc2497-fix-reading-conversion-results.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7f4f1096d5921f5d90547596f9ce80e0b924f887 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= <u.kleine-koenig@xxxxxxxxxxxxxx>
Date: Mon, 15 Aug 2022 09:16:47 +0000
Subject: iio: ltc2497: Fix reading conversion results
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From: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
commit 7f4f1096d5921f5d90547596f9ce80e0b924f887 upstream.
After the result of the previous conversion is read the chip
automatically starts a new conversion and doesn't accept new i2c
transfers until this conversion is completed which makes the function
return failure.
So add an early return iff the programming of the new address isn't
needed. Note this will not fix the problem in general, but all cases
that are currently used. Once this changes we get the failure back, but
this can be addressed when the need arises.
Fixes: 69548b7c2c4f ("iio: adc: ltc2497: split protocol independent part in a separate module ")
Reported-by: Meng Li <Meng.Li@xxxxxxxxxxxxx>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Tested-by: Denys Zagorui <dzagorui@xxxxxxxxx>
Cc: <Stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220815091647.1523532-1-dzagorui@xxxxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/adc/ltc2497.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
--- a/drivers/iio/adc/ltc2497.c
+++ b/drivers/iio/adc/ltc2497.c
@@ -41,6 +41,19 @@ static int ltc2497_result_and_measure(st
}
*val = (be32_to_cpu(st->buf) >> 14) - (1 << 17);
+
+ /*
+ * The part started a new conversion at the end of the above i2c
+ * transfer, so if the address didn't change since the last call
+ * everything is fine and we can return early.
+ * If not (which should only happen when some sort of bulk
+ * conversion is implemented) we have to program the new
+ * address. Note that this probably fails as the conversion that
+ * was triggered above is like not complete yet and the two
+ * operations have to be done in a single transfer.
+ */
+ if (ddata->addr_prev == address)
+ return 0;
}
ret = i2c_smbus_write_byte(st->client,
Patches currently in stable-queue which might be from u.kleine-koenig@xxxxxxxxxxxxxx are
queue-5.15/iio-ltc2497-fix-reading-conversion-results.patch
