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Fri, 17 Apr 2026 01:37:22 -0700 (PDT) Received: from QCOM-aGQu4IUr3Y.na.qualcomm.com ([114.94.8.21]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82f8e7d378esm1298421b3a.0.2026.04.17.01.37.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Apr 2026 01:37:21 -0700 (PDT) Date: Fri, 17 Apr 2026 16:37:16 +0800 From: Shawn Guo To: Krzysztof Kozlowski Cc: Bjorn Andersson , Konrad Dybcio , Krzysztof Kozlowski , Dmitry Baryshkov , Arnd Bergmann , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] arm64: defconfig: Enable Qualcomm UFS and QMP UFS PHY drivers as built-in Message-ID: References: <20260417035509.1021860-1-shengchao.guo@oss.qualcomm.com> <898874b3-fb73-4a46-b440-6ea3377c2f2d@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=us-ascii Content-Disposition: inline In-Reply-To: <898874b3-fb73-4a46-b440-6ea3377c2f2d@kernel.org> X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE3MDA4NSBTYWx0ZWRfXxeG8ypoX1cSp AwqSr+l/NWtSrk2S6tR/jkg0sRJ/YVIKLkMrwfTYZYUpO7zEARSGNfIu2W43nxkJlvO8cDwML8n YkjqXa1tLYLj/zvPCSz98D894GF3SJyT0sQfcRz6YHVoViAmGqeXDdn5fYNkAFb5ONHDoTLTD8J WF/td3WToSsbnWh47pqdC/KINF+v8rlUPGQzWbPCZ8nFAwQqet2HRwbwG3JTjDAYZVHhQdGmu36 rbqfmdIL39EgJL8VO3bfa3qIZzDEdad0sOQJLD+BPjtJ6gbobkVqX8TX9UDQjdaPWf05YYcULlA Eo49ap5ZmTROaoLxtz9Gxq1jMgbUoYYtKsIjroRGoDRLuOm4OGLnn1OewA8GQ2+sWc7yQ3/IAU2 t/ZAa4IPZfVbUSB/II3oImfmE5RqZD0/m/ZLtZzTV1Van53JE7h01L/20j9wunavd4CjKOxjlPa 4dOWCuxYAnQyBWbyQjw== X-Proofpoint-GUID: fm3Emjt_ENl5LXw7js-W96FAWEFaDMkq X-Proofpoint-ORIG-GUID: fm3Emjt_ENl5LXw7js-W96FAWEFaDMkq X-Authority-Analysis: v=2.4 cv=GcInWwXL c=1 sm=1 tr=0 ts=69e1f143 cx=c_pps a=rEQLjTOiSrHUhVqRoksmgQ==:117 a=Uz3yg00KUFJ2y2WijEJ4bw==:17 a=kj9zAlcOel0A:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=dTotpg8-h-tQacFbK9YA:9 a=CjuIK1q_8ugA:10 a=2VI0MkxyNR6bbpdq8BZq:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-16_04,2026-04-16_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 priorityscore=1501 malwarescore=0 impostorscore=0 phishscore=0 suspectscore=0 bulkscore=0 spamscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604170085 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? If using initramfs is standard and easy, I wonder why Qualcomm QLI (meta-qcom) kernel has UFS drivers as built-in. Shawn