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charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 17/10/2025 08:55, Taniya Das wrote: > > > On 10/17/2025 11:26 AM, Krzysztof Kozlowski wrote: >> On 17/10/2025 07:49, Taniya Das wrote: >>> >>> >>> On 10/17/2025 10:51 AM, Krzysztof Kozlowski wrote: >>>> On 17/10/2025 07:16, Taniya Das wrote: >>>>> >>>>> >>>>> On 10/17/2025 10:00 AM, Krzysztof Kozlowski wrote: >>>>>> On 16/10/2025 20:53, Taniya Das wrote: >>>>>>> The TCSR clock controller is required during boot to provide the ref >>>>>>> clocks to the UFS controller. Setting CONFIG_SM_TCSRCC_8750 to y ensures >>>>>>> the UFS driver successfully probe and initialize the device. >>>>>>> >>>>>>> Without this change, the UFS subsystem fails to mount as a usable file >>>>>>> system during boot. >>>>>> >>>>>> >>>>>> That's not what I observed. UFS works fine, especially that it is a >>>>>> module, so no, this is not a desired change and explanation is not only >>>>>> insufficient but actually incorrect. >>>>>> >>>>> >>>>> Krzysztof, on Pakala MTP we are observing the below issue and it >>>>> requires the module of tscrcc to be loaded explicitly. This patch also >>>>> aligns to how it is on all other targets. >>>>> >>>>> /soc@0/phy@1d80000: Failed to get clk index: 2 ret: -517 >>>>> [ 10.496570] ufshcd-qcom 1d84000.ufs: freq-table-hz property not specified >>>>> [ 10.503660] ufshcd-qcom 1d84000.ufs: ufshcd_populate_vreg: Unable to >>>>> find vdd-hba-supply regulator, assuming enabled >>>>> [ 10.514548] ufshcd-qcom 1d84000.ufs: ufshcd_populate_vreg: Unable to >>>>> find vccq2-supply regulator, assuming enabled >>>>> [ 10.565955] platform 1d80000.phy: deferred probe pending: (reason >>>>> unknown) >>>>> [ 10.573078] platform 1d84000.ufs: deferred probe pending: >>>>> ufshcd-qcom: ufshcd_pltfrm_init() failed >>>>> >>>> >>>> >>>> I don't and I am testing regularly, so I assume you have incorrect >>>> config. Maybe I have incorrect one (which works), but then commit msg is >>>> incomplete - you must explain the bug and provide proof that this is the >>>> correct fix for it. >>>> >>> >>> We have tried booting up recently and and that is what we observed. The >>> patch from 'm' to 'y' helps the UFS probe is successful and the rootfs >>> is picked from ufs partitions. I will add these fail & success log >>> snippets in the commit text. >> >> That's not enough. You need to explain why UFS fails. After explaining >> this, I guess bug in UFS would be exposed thus that one should be fixed. >> You just provided band-aid without fixing the real problem. >> > > When the kernel commandline uses is 'root=PARTLABEL=system', the is a > dependency of the UFS driver on the TCSRCC clockref during bootup and > the TCSRCC made as a module will not provide the clocks unless we No, that's not true. cmdline does not matter here at all. > explicitly load the modules. To meet this dependency we need to load root= has nothing to do with modules. > TCSRCC statically and move CONFIG_SM_TCSRCC_8750 from 'm' to 'y. No. > This will help the UFS partitions to be identified and then the rootfs > to be mounted from the partitions. No, it's completely different problem. Now you are mixing UFS partitions with root= argument. Best regards, Krzysztof