Re: [PATCH V4] scsi: ufs: core: Check LSDBS cap when !mcq

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On Wed, Jul 10, 2024 at 08:25:20AM +0900, Kyoungrul Kim wrote:
> if the user sets use_mcq_mode to 0, the host will try to activate the
> lsdb mode unconditionally even when the lsdbs of device hci cap is 1. so
> it makes timeout cmds and fail to device probing.
> 
> To prevent that problem. check the lsdbs cap when mcq is not supported
> case.
> 
> Signed-off-by: k831.kim <k831.kim@xxxxxxxxxxx>
> ---
> Changes to v1: Fix wrong bit of lsdb support.
> Changes to v2: Fix extra space and wrong commit messeage.
> Changes to v3: Close missing parenthesis and fix grammatical error.

This causes the probe of the UFSHCD in Qualcomm SM8550 MTP to fail with
-EINVAL.

[    6.132937] ufshcd-qcom 1d84000.ufs: Adding to iommu group 4
[    6.142509] ufshcd-qcom 1d84000.ufs: freq-table-hz property not specified
[    6.149843] ufshcd-qcom 1d84000.ufs: ufshcd_populate_vreg: Unable to find vccq2-supply regulator, assuming enabled
[    6.209794] ufshcd-qcom 1d84000.ufs: ufshcd_init: failed to initialize (legacy doorbell mode not supported)
[    6.226571] ufshcd-qcom 1d84000.ufs: error -EINVAL: Initialization failed with error -22
[    6.348770] ufshcd-qcom 1d84000.ufs: error -EINVAL: ufshcd_pltfrm_init() failed
[    6.363203] ufshcd-qcom 1d84000.ufs: probe with driver ufshcd-qcom failed with error -22

#regzbot introduced: 0c60eb0cc320
#regzbot title: scsi: ufs: Qualcomm SM8550 MTP UFSHCD probe failing

Regards,
Bjorn




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