Re: [PATCH v2 14/15] scsi: ufs: ufs-exynos: multi-host configuration for exynosauto

Bean Huo
2021-07-26T21:58:51Z

On Mon, 2021-07-26 at 19:40 +0900, Chanho Park wrote:
> > I don't understand here. how many doorbell registers you have now?
> > and doesn VHs have a doorbell register also? and each doorbell
> > register
> > still supprts 32 tags?
>
>
> A PH has its own doorbell register and each VHs also has it as well.
>
> The TASK_TAG[7:5] can be used to distinguish the origin of the
> request among VHs and remaining TASK_TAG[4:0] will be used for
> supporting 32 tags.
>
>
>
> Best Regards,
>
> Chanho Park

Thanks for your reply.

so you split the "Task Tag" filed byte3 in the UPIU header to two
parts, bit7~bit5 is for the VHs ID, and bit4~bit0 is for the task ID.
but this is not defined in the Spec 2.1. correct?

Kind regards,
Bean