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 393F8358391; Fri, 17 Apr 2026 08:44:24 +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=1776415464; cv=none; b=n5SQZl4tPJOgbyV46H8U6Of5os4q3eRI3xhude0rGQfe1fnRwC2vScWkz4D3krrts+fg8rIc1N2L5UtSCEJkgr+uodxzq2IbNZVdiUku/FBiGVKc/G5hts/S9mltPSAkAEVpq2ZbfnrMmFqdjxP9HAyJsfUyIftywlEn0u1kjfw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776415464; c=relaxed/simple; bh=LXmhqgbQcDG9CqDQlQ3xAFUL+LYcpUbeGdza9zd1nCc=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Y9YhnjiLkgJvCCPDvm3Ri7NkZRt3OBd0Gn0NeefoGsjHkXGFGjQfkl7kLiQDKT+NojUvPTeImcIG7gaJdWwXILmtdxPumJ26gWWJtR0Q4zY4fWymkphYqo2XXVHF9NB7WaQmTwl7jtD0MaaERE5lirVtZBYZAV5Y4YaFbYAXTzk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dAttBC4M; 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="dAttBC4M" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10580C19425; Fri, 17 Apr 2026 08:44:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776415463; bh=LXmhqgbQcDG9CqDQlQ3xAFUL+LYcpUbeGdza9zd1nCc=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=dAttBC4M2HauGcMfsyLACl3GmTqZn65W7ZqmrsklEw3YrqEWCRFCXd5wSVAYDZXtD FSdFuQVk5cvrrLaQhTwhwc/gxN86KaDCg8k5qC+hAZ7tMvqw1uyGzcVq3KKzHjOcn4 S9mqqrW6CRXWmNPDZqVAVmCPRoDphGvZzqliJyKdHzwZjKFhOUIMLWLEQp15+rXAFw LyM+WZVn11oPJBJYko85fgclExaMybgxmw0UchRYTaMZudld9/r3EpWFgDe37/B7ka BE0IlM+s1f4zIJ6pJ/j8Y4LLBw2IW45ByRIvxJ6J1807pX/C++ak7SpLHnvuh6+ON0 HK0IdTnoySltg== Message-ID: Date: Fri, 17 Apr 2026 10:44:20 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm64: defconfig: Enable Qualcomm UFS and QMP UFS PHY drivers as built-in To: Shawn Guo Cc: Bjorn Andersson , Konrad Dybcio , Krzysztof Kozlowski , Dmitry Baryshkov , Arnd Bergmann , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260417035509.1021860-1-shengchao.guo@oss.qualcomm.com> <898874b3-fb73-4a46-b440-6ea3377c2f2d@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 17/04/2026 10:37, Shawn Guo wrote: > On Fri, Apr 17, 2026 at 10:14:23AM +0200, Krzysztof Kozlowski wrote: >> On 17/04/2026 05:55, Shawn Guo wrote: >>> UFS is the primary storage for Linux rootfs across the breadth of >>> Qualcomm development boards - Mobile, Automotive and IoT. With >>> Qualcomm UFS host controller driver (SCSI_UFS_QCOM) and the UFS PHY >>> driver (PHY_QCOM_QMP_UFS) as modules, developers need an initramfs >> >> Yes, you always need initramfs and every developer has it. >> >>> to boot from UFS, which adds friction to daily development workflows. >> >> No friction, it's both standard, easy and all of Qualcomm and Linaro >> developers have it solved long time ago. > > I'm looking at a kernel regression by running git bisect, where kernel > version string varies for every single boot. How do you usually deal > with it by using initramfs? No difference from every other build and boot? I build kernel and the same step I have initramfs with modules. Whether I bisect or build kernel for normal boot is exactly the same. The only difference is `git bisect good`. > > If using initramfs is standard and easy, I wonder why Qualcomm QLI > (meta-qcom) kernel has UFS drivers as built-in. This I don't know. Distros do various things, but of course there might be an argument I do not know (e.g. like it was why distros do not make IPV6 a module). Best regards, Krzysztof