From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3BAEC16D543; Wed, 7 Feb 2024 21:26:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707341182; cv=none; b=Tl8s9zCLIJDJKAqoZf5GeV0Txg4qFeWekuC6qGBflMrcp32vcJVILxAJROAoi4I/BbUfOXLB7gNu5d/1smGTcGnta7pRntRU9swxFPODXKM8FEBx6h3B4/6dY7E09Qx4oHW4Ul0/rL7+vwiysw58NN/LYeJEc1l+STaNBkGMOAQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707341182; c=relaxed/simple; bh=l2IreYI/O8e/GFVsy7OaZom34ewPRj/EXqsT3hg9ITQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=DVV/thDJ0PJubp3W6uPIEElAu3kWtWeriLHdBXy5owrqsc2rl+nOMRgg+o0ccM8F72Dp7n6eCusWEgk8v8g/gX7wRZ8rrSa2bsjQclgf6NMl/zfRAkGT0am7dZx29afF1CR+p9Qu5JqM2s6rwbC+YsOzsDtJD3O9ucjGUbUecLU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hiIuvEFG; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hiIuvEFG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C0177C433B2; Wed, 7 Feb 2024 21:26:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1707341181; bh=l2IreYI/O8e/GFVsy7OaZom34ewPRj/EXqsT3hg9ITQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hiIuvEFGobVCRuZEmGMtEd4MFJfBXwLNTj4n9RNMjyz4dalgGA/AZAzTAenS8bxS1 BLtBCvKCJL1L8Rj1kNY9kFXHXwayqQkL+uS6az6Q9pgVlIH71yDoV9g1/sP4Rl2kR3 0r3g3MGdmwO6XrKf1U/51RtbAPHFrnLQMnOsF6lkd9Hp1jAq+xssf8b2wVqOaUUiEX 1OsJ2QXX4KXe+NZwmruxpeGUUEwqwzvEWM6VXvKSMWzjN6fZlPpTRfy9yzyXf37s4C 04yOMnQn1ewQV1eqL4nVuNRaI7XccBqk3ulevqvgm22qcNp7jdEWz3A1jHeM3W6EIm 6oLX1dnJFdSMQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Martin Blumenstingl , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Mark Brown , Sasha Levin , lgirdwood@gmail.com Subject: [PATCH AUTOSEL 5.15 06/23] regulator: pwm-regulator: Add validity checks in continuous .get_voltage Date: Wed, 7 Feb 2024 16:25:47 -0500 Message-ID: <20240207212611.3793-6-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240207212611.3793-1-sashal@kernel.org> References: <20240207212611.3793-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.148 Content-Transfer-Encoding: 8bit From: Martin Blumenstingl [ Upstream commit c92688cac239794e4a1d976afa5203a4d3a2ac0e ] Continuous regulators can be configured to operate only in a certain duty cycle range (for example from 0..91%). Add a check to error out if the duty cycle translates to an unsupported (or out of range) voltage. Suggested-by: Uwe Kleine-König Signed-off-by: Martin Blumenstingl Link: https://msgid.link/r/20240113224628.377993-2-martin.blumenstingl@googlemail.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/regulator/pwm-regulator.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 7629476d94ae..f4d9d9455dea 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -158,6 +158,9 @@ static int pwm_regulator_get_voltage(struct regulator_dev *rdev) pwm_get_state(drvdata->pwm, &pstate); voltage = pwm_get_relative_duty_cycle(&pstate, duty_unit); + if (voltage < min(max_uV_duty, min_uV_duty) || + voltage > max(max_uV_duty, min_uV_duty)) + return -ENOTRECOVERABLE; /* * The dutycycle for min_uV might be greater than the one for max_uV. -- 2.43.0