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 7AD9630ACE5; Mon, 26 Jan 2026 12:06:35 +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=1769429195; cv=none; b=MiwuyYIJO5KZNaTJXnXPVTITQ8UIbOGMpQ6E42q+bUNrgiFkusBkwUYhGOzadSUFhVJ4MG+pVtAIlOzRryAf3pmQX0LL3kqjkEr5/BJH3igUEkBN7vXOtJPrDzQ/u/DXBDtNq4/1ySKjjPdKFMlBxWbfubb4KW2YuvdQ9g+lEe4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769429195; c=relaxed/simple; bh=Z4Veix6NtwpfiIxDAwJ3jCyGzKANeHY8XJrrxz48FSo=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ud5ewGHokJm0omI5Ad+bT/ICtkm99JaD8taLMpz9U3OrQiJ3VCpQ+xDutOW4sCe/7uUDRU2SZs7LUAQDL4kKs9IjOrB459BW25yJWTEXWXd72ccM2/d8js7pU+JI4fC0mk1yjLa3XOAIUIwN0POxTTlWZ18bN3cixqzPo93oft4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fFPgtgwZ; 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="fFPgtgwZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C9F0FC19422; Mon, 26 Jan 2026 12:06:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769429195; bh=Z4Veix6NtwpfiIxDAwJ3jCyGzKANeHY8XJrrxz48FSo=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=fFPgtgwZJkVrOMC5Rrs3n3lRayaLmHCbpvj/2ILhqZr03LsBK0Z2L4hVCOcYQZb3D mjvaUh+h7Ypl7/rSxsKdHGTDvlkp4HwDcoNn3HE+AvoyKBjXbTVrPXJqEDJ26wIqHy mepxa5nVWknBeF1dUYsjbxZTu2sYv8nrnMkIbPIAHKOf3O/PQdDiKNxfrRUyzGgOou yrUQlrU1VEkD1vHlICiE0eUvbZFr0U5ESRh3KqzwkRJCgQpGLiOyMGNbPCMpgVQkye 9Y6x6znTl4VwvT7ru/2eo1ZzNvBBxYwuC0Jfa2suT4CyuuEA4ePZESAu9gN9figsHT f3HWLodOfNPXg== Message-ID: Date: Mon, 26 Jan 2026 12:06:30 +0000 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/1] media: i2c: ov02c10: Keep power on and use reset for power management To: Saikiran B , Bryan O'Donoghue Cc: linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, rfoss@kernel.org, todor.too@gmail.com, vladimir.zapolskiy@linaro.org, hansg@kernel.org, sakari.ailus@linux.intel.com, mchehab@kernel.org, stable@vger.kernel.org References: <20260125171745.484806-1-bjsaikiran@gmail.com> <20260126061528.63785-1-bjsaikiran@gmail.com> <20260126061528.63785-2-bjsaikiran@gmail.com> From: Bryan O'Donoghue Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 26/01/2026 11:58, Saikiran B wrote: > "I don't think we've established the regulator is at fault. That's the > feedback I'm giving you here. ... vreg_cam_1p8: regulator-cam-1p8 { > compatible = "regulator-fixed";" > > Just to clarify on the regulators: on the Slim 7x, the camera supplies > (avdd, dvdd, dovdd) are all RPMh-controlled LDOs (pm8010 and pm8550), > not generic fixed regulators. Slim7x - not the Dell right ;) > As I've confirmed that the qcom-rpmh-regulator driver doesn't natively > support active discharge or parsing off-on-delay-us (generic > property), which explains why the physical discharge constraint wasn't > being respected. No, the RPMh firmware should know how to do that. Not the Linux side, this is the part of your brown-out story that doesn't make sense. BTW, did you try my given sequence - particularly the XSHUTDOWN in power_on(); ? If the XSHUTDOWN pin is for example floating or not in the correct logical state when you power-on, the chip may not initialise correctly. Which could lead you to conclude - you are having a regulator problem, when in fact you are having a sensor state-machine init problem. ? --- bod