linux-kernel - RE: [PATCH v1 3/5] scsi: ufs: Update VCCQ2 and VCCQ min voltage hard codes

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Date:   Tue, 12 Nov 2019 07:56:20 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Can Guo <cang@...eaurora.org>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "nguyenb@...eaurora.org" <nguyenb@...eaurora.org>,
        "rnayak@...eaurora.org" <rnayak@...eaurora.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        "saravanak@...gle.com" <saravanak@...gle.com>,
        "salyzyn@...gle.com" <salyzyn@...gle.com>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        Stanley Chu <stanley.chu@...iatek.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1 3/5] scsi: ufs: Update VCCQ2 and VCCQ min voltage hard
 codes

> 
> 
> Per UFS 3.0 JEDEC standard, the VCCQ2 min voltage is 1.7v and the VCCQ min
> voltage is 1.14v, update their hard codes accordingly.
> 
> Signed-off-by: Can Guo <cang@...eaurora.org>
AFAIK, Vccq2 is 1.7 - 1.95 in UFS2.1 as well.
Current constants applies to UFS1.1, as indicated in the original patch.
Vccq is <1.1 - 1.3> in UFS2.1,  and <1.14 - 1.26>, so need to update the max as well, and  
make the assignments in ufshcd_populate_vreg depends on hba->ufs_version?

> ---
>  drivers/scsi/ufs/ufs.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h index 385bac8..9df4f4d
> 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/drivers/scsi/ufs/ufs.h
> @@ -500,9 +500,9 @@ struct ufs_query_res {
>  #define UFS_VREG_VCC_MAX_UV       3600000 /* uV */
>  #define UFS_VREG_VCC_1P8_MIN_UV    1700000 /* uV */
>  #define UFS_VREG_VCC_1P8_MAX_UV    1950000 /* uV */
> -#define UFS_VREG_VCCQ_MIN_UV      1100000 /* uV */
> +#define UFS_VREG_VCCQ_MIN_UV      1140000 /* uV */
>  #define UFS_VREG_VCCQ_MAX_UV      1300000 /* uV */
> -#define UFS_VREG_VCCQ2_MIN_UV     1650000 /* uV */
> +#define UFS_VREG_VCCQ2_MIN_UV     1700000 /* uV */
>  #define UFS_VREG_VCCQ2_MAX_UV     1950000 /* uV */
> 
>  /*
> --
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