From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794273702; b=V7WaIp1Uc9kJJ5iS/NtvfLMeFwFtcM1qP66e2onM1eElNejdGsHRRO+EtKS9e/Ci38Dn 23oy1rx5Af9vR5P5XwpuQqN76IFOjJy6b7U43E/rGykulUuLmAB5f4hYLQEjzXdUwjW9d ZqRYuS+fBGoDbTUKi2l1KX05KItGz5ceqjZp2QjXWEhBha1d8QV/svun3+WEndE864pyy axmlPhBbh5GI9+mwEMTrVs6w64Bs5Y2FuX479XZrxy2OKyt6JnYiIULvGrWInG+ps4Kjh naQzQ4+i+2Nc+uRLclZK3Vl5FcInDVbyyqNajO6cmYJc+8Sm/YsSpZMc5MtFWOpXNag== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794273702; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=wj65iOizkJTpki58vqxwsMCXeplpvouW+l/pcv13vxg=; b=FV75VoGkSDUERMyPg8TUZGcotdNSZ+NQ0ru9vH6oUEXXegkmOuM7cTKWIFTpcgkl0Vf3 DuausjjkeF63KQ12cJG7OIfLkvcdRVafqaPpPn/JsnKMWbuV6g0VEENEMJjB6vaR55+PR Xkz8i7giBnCzDJ7mUVS44KpfpuORteRnFQY5QlFuOS/zZKMbsISeTYBLI8Ac+iFidwp90 l0G4vfjVDdToFzY2sP1A5+KUZVH2+1+wsN0A2YBo2vFOtivh0ZgmHn+iZDkhrG7hzxjRi 7/uIAVEiw+xK9wyEQQ8fRugewNOMjSkpYKZ0PuSc1gOebg99nNrS0FUfNbQLfLQP2Ww== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=DPg5K5IV; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EB6E5606A338 for ; Tue, 10 Nov 2026 01:21:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=DPg5K5IV Received: by smtp.kernel.org (Postfix) with ESMTPSA id 57E5F1F008A3; Tue, 10 Nov 2026 01:21:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794273701; bh=wj65iOizkJTpki58vqxwsMCXeplpvouW+l/pcv13vxg=; h=From:To:Cc:Subject:Date; b=DPg5K5IV2UyJF5nOJffjv6gYuAg+9wKi0UZTjX1iji0iQ+OJOonVS9Hxz+E85+3JQ FwLl4UKWJjYV4LXNRAd3mEgPZIodJzenzHoR3CF+Ng8iHmqNrV2mwnFtATy1/j8o9G xe2+4ZrKL4Inkuxv8XwQdMjQzHO1hqdX/5s3TkDJY+yHiKcBnYl3SnDlYIICCeIGx2 zy7Uc/2XlA0smg16iKsJ3dHwm8dFZPE7M0qRrqFmx+E5Qf5QczRBYBFj3oJQbhZnl9 15hn/ETfXomIfnBQM7WSu4+GB0yOycRm/N/cfvsfPcaCbAwBq6UqMHiCzOvxA5GZ1g c0PvJUHQVtMNw== From: Sasha Levin To: linux@roeck-us.net, sashiko-bot@kernel.org Cc: stable@vger.kernel.org Subject: FAILED: patch "[PATCH] hwmon: (tmp108) Fix initial conversion delay and wait until ready" failed to apply to 5.15-stable tree Date: Mon, 9 Nov 2026 20:21:40 -0500 Message-ID: <20261109202140-failed-5.15-7cd60538073e@kernel.org> X-Mailer: git-send-email 2.53.0 X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 7cd60538073e465310c94b2a2f0ea8d2f03768ef # git commit -s git send-email --to '' --in-reply-to '20261109202140-failed-5.15-7cd60538073e@kernel.org' --subject-prefix 'PATCH 5.15.y' 'HEAD^..' Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 7cd60538073e465310c94b2a2f0ea8d2f03768ef Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Fri, 30 Oct 2026 20:02:08 -0700 Subject: [PATCH] hwmon: (tmp108) Fix initial conversion delay and wait until ready MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In tmp108_common_probe(), the driver only adds the 30 ms conversion delay (TMP108_CONVERSION_TIME_MS) to ready_time if the sensor was previously in TMP108_MODE_SHUTDOWN. However, the TMP108 hardware defaults to continuous conversion mode (TMP108_MODE_CONTINUOUS) upon power-on reset, including immediately after enabling the vcc supply regulator during probe, while the temperature register retains its power-on reset value of 0x0000 (0°C) until the first conversion completes. Because the initial mode is not shutdown, the delay is bypassed and early reads via thermal zone registration or sysfs before the first conversion finishes return an uninitialized 0°C reading. In addition, returning -EAGAIN from tmp108_read() while waiting for a conversion to complete after probe or resume can trigger an unnecessary tight retry loop in callers or fail initial reads. Unconditionally set ready_time to TMP108_CONVERSION_TIME_MS ahead in tmp108_common_probe(), track ready_time as ktime_t, and wait for the remaining conversion time in tmp108_read() using usleep_range() instead of returning -EAGAIN. Reported-by: Sashiko Fixes: 66e1c9171339 ("hwmon: Add Texas Instruments TMP108 temperature sensor driver.") Cc: stable@vger.kernel.org Signed-off-by: Guenter Roeck --- drivers/hwmon/tmp108.c | 26 +++++++++++--------------- 1 file changed, 11 insertions(+), 15 deletions(-) diff --git a/drivers/hwmon/tmp108.c b/drivers/hwmon/tmp108.c index 91d20a1ce1120..862b944d3e609 100644 --- a/drivers/hwmon/tmp108.c +++ b/drivers/hwmon/tmp108.c @@ -13,7 +13,7 @@ #include #include #include -#include +#include #include #include #include @@ -78,7 +78,7 @@ struct tmp108 { struct regmap *regmap; u16 orig_config; - u64 ready_time; + ktime_t ready_time; const struct tmp108_params *params; }; @@ -121,6 +121,7 @@ static int tmp108_read(struct device *dev, enum hwmon_sensor_types type, struct tmp108 *tmp108 = dev_get_drvdata(dev); unsigned int regval; int err, hyst; + s64 delay; if (type == hwmon_chip) { if (attr == hwmon_chip_update_interval) { @@ -137,12 +138,10 @@ static int tmp108_read(struct device *dev, enum hwmon_sensor_types type, switch (attr) { case hwmon_temp_input: - /* Is it too early to return a conversion ? */ - if (time_before64(get_jiffies_64(), tmp108->ready_time)) { - dev_dbg(dev, "%s: Conversion not ready yet..\n", - __func__); - return -EAGAIN; - } + /* Wait if it is too early to return a conversion */ + delay = ktime_us_delta(tmp108->ready_time, ktime_get()); + if (delay > 0) + usleep_range(delay, delay + 1000); err = regmap_read(tmp108->regmap, TMP108_REG_TEMP, ®val); if (err < 0) return err; @@ -477,11 +476,8 @@ static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char * return err; } - tmp108->ready_time = get_jiffies_64(); - if ((tmp108->orig_config & TMP108_CONF_MODE_MASK) == - TMP108_MODE_SHUTDOWN) - tmp108->ready_time += - msecs_to_jiffies(TMP108_CONVERSION_TIME_MS); + tmp108->ready_time = ktime_add_ms(ktime_get(), + TMP108_CONVERSION_TIME_MS); err = devm_add_action_or_reset(dev, tmp108_restore_config, tmp108); if (err) { @@ -528,8 +524,8 @@ static int tmp108_resume(struct device *dev) err = regmap_update_bits(tmp108->regmap, TMP108_REG_CONF, TMP108_CONF_MODE_MASK, TMP108_MODE_CONTINUOUS); - tmp108->ready_time = get_jiffies_64() + - msecs_to_jiffies(TMP108_CONVERSION_TIME_MS); + tmp108->ready_time = ktime_add_ms(ktime_get(), + TMP108_CONVERSION_TIME_MS); return err; } -- 2.53.0