Hi Chanho
> -----Original Message-----
> From: Chanho Park <chanho61.park@xxxxxxxxxxx>
> Sent: 09 July 2021 12:27
> To: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>; James E . J . Bottomley
> <jejb@xxxxxxxxxxxxx>; Martin K . Petersen <martin.petersen@xxxxxxxxxx>
> Cc: Can Guo <cang@xxxxxxxxxxxxxx>; Jaegeuk Kim <jaegeuk@xxxxxxxxxx>;
> Kiwoong Kim <kwmad.kim@xxxxxxxxxxx>; Avri Altman
> <avri.altman@xxxxxxx>; Adrian Hunter <adrian.hunter@xxxxxxxxx>;
> Christoph Hellwig <hch@xxxxxxxxxxxxx>; Bart Van Assche
> <bvanassche@xxxxxxx>; jongmin jeong <jjmin.jeong@xxxxxxxxxxx>;
> Gyunghoon Kwon <goodjob.kwon@xxxxxxxxxxx>; linux-samsung-
> soc@xxxxxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx; Chanho Park
> <chanho61.park@xxxxxxxxxxx>
> Subject: [PATCH 02/15] scsi: ufs: add quirk to enable host controller without
> interface configuration
>
> From: jongmin jeong <jjmin.jeong@xxxxxxxxxxx>
>
> samsung ExynosAuto SoC has two types of host controller interface to
> support the virtualization of UFS Device.
> One is the physical host(PH) that the same as conventaional UFSHCI, and the
> other is the virtual host(VH) that support data transfer function only.
>
> In this structure, the virtual host does not support like device management.
> This patch skips the interface configuration part that cannot be performed in
> the virtual host.
>
> Signed-off-by: jongmin jeong <jjmin.jeong@xxxxxxxxxxx>
> Signed-off-by: Chanho Park <chanho61.park@xxxxxxxxxxx>
> ---
> drivers/scsi/ufs/ufshcd.c | 3 +++
> drivers/scsi/ufs/ufshcd.h | 6 ++++++
> 2 files changed, 9 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index
> 9702086e9860..3451b335f2b4 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -7988,6 +7988,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba,
> bool async)
> if (ret)
> goto out;
>
> + if (hba->quirks &
> UFSHCD_QUIRK_SKIP_INTERFACE_CONFIGURATION)
> + goto out;
> +
> /* Debug counters initialization */
> ufshcd_clear_dbg_ufs_stats(hba);
>
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index
> e67b1fcfe1a2..fe523cbd68dd 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -573,6 +573,12 @@ enum ufshcd_quirks {
> * support UIC command
> */
> UFSHCD_QUIRK_BROKEN_UIC_CMD = 1 << 15,
> +
> + /*
> + * This quirk needs to be enabled if the host controller cannot
> + * support interface configuration.
> + */
> + UFSHCD_QUIRK_SKIP_INTERFACE_CONFIGURATION = 1 << 16,
May be UFSHCD_QUIRK_SKIP_PH_CONFIGURATION
> };
>
> enum ufshcd_caps {
> --
> 2.32.0
