linux-kernel - Re: [PATCH V5 00/26] Add support UHS-II for GL9755

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Message-ID: <CAPDyKFr4je2WhF8oQW1CpQD+2dRZhn+5JB0bLqHjLDTOiao58g@mail.gmail.com>
Date:   Mon, 17 Oct 2022 13:31:33 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Victor Shih <victorshihgli@...il.com>
Cc:     adrian.hunter@...el.com, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, benchuanggli@...il.com,
        HL.Liu@...esyslogic.com.tw, Greg.tu@...esyslogic.com.tw,
        takahiro.akashi@...aro.org, dlunev@...omium.org,
        Victor Shih <victor.shih@...esyslogic.com.tw>
Subject: Re: [PATCH V5 00/26] Add support UHS-II for GL9755

Hi Victor,

On Fri, 14 Oct 2022 at 13:47, Victor Shih <victorshihgli@...il.com> wrote:
>
> Summary
> =======
> These patches[1] support UHS-II and fix GL9755 UHS-II compatibility.
>
> About UHS-II, roughly deal with the following three parts:
> 1) A UHS-II detection and initialization:
> - Host setup to support UHS-II (Section 3.13.1 Host Controller Setup Sequence
>   [2]).
> - Detect a UHS-II I/F (Section 3.13.2 Card Interface Detection Sequence[2]).
> - In step(9) of Section 3.13.2 in [2], UHS-II initialization is include Section
>   3.13.3 UHS-II Card Initialization and Section 3.13.4 UHS-II Setting Register
>   Setup Sequence.
>
> 2) Send Legacy SD command through SD-TRAN
> - Encapsulated SD packets are defined in SD-TRAN in order to ensure Legacy SD
>   compatibility and preserve Legacy SD infrastructures (Section 7.1.1 Packet
>   Types and Format Overview[3]).
> - Host issue a UHS-II CCMD packet or a UHS-II DCMD (Section 3.13.5 UHS-II
>   CCMD Packet issuing and Section 3.13.6 UHS-II DCMD Packet issuing[2]).
>
> 3) UHS-II Interrupt
> - Except for UHS-II error interrupts, most interrupts share the original
>   interrupt registers.
>
> Patch structure
> ===============
> patch#1-#6:  for core
> patch#7-#25: for sdhci
> patch#26:    for GL9755
>
> Changes in v5 (Oct. 14, 2022)
> * rebased to linux-v6.0.

You sent a v5 on Oct 14 and then this one (v5 again) today. Why? What
is the difference?

Moreover, as v6.1-rc1 is now available, my next branch will be based
on that. Can you please rebase the series on top of my next branch -
or at least use the latest available "rc", when you test and submit?

> * according to the guidance and overall architecture provided
>   by Ulf Hansson, Ben Chuang and Jason Lai to implement the
>   UHS-2 Core function based on the patches of the [V4,0/6]
>   Preparations to support SD UHS-II cards[5].
> * according to the guidance and comments provided by
>   Adrian Hunter, Ben Chuang and AKASHI Takahiro to implement
>   the UHS-2 Host function based on the patches of the
>   [RFC,v3.1,00/27] Add support UHS-II for GL9755[4].
> * implement the necessary function to let the UHS-2 Core/Host
>   work properly.
> * fix most of checkpatch warnings/errors
>
> Reference
> =========
> [1] https://gitlab.com/ben.chuang/linux-uhs2-gl9755.git
> [2] SD Host Controller Simplified Specification 4.20
> [3] UHS-II Simplified Addendum 1.02
> [4] https://patchwork.kernel.org/project/linux-mmc/cover/20201106022726.19831-1-takahiro.akashi@linaro.org/
> [5] https://patchwork.kernel.org/project/linux-mmc/cover/20220418115833.10738-1-jasonlai.genesyslogic@gmail.com/

Another general question, I assume you intend to move this forward
instead of Jason Lai, right?

Kind regards
Uffe