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References: <20221213090047.3805-1-victor.shih@genesyslogic.com.tw>
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From:   Victor Shih <victorshihgli@gmail.com>
Date:   Tue, 3 Jan 2023 19:04:11 +0800
Message-ID: <CAK00qKDrk0=Zn35HVyak=rFw+QM-h9PXjji_G7yHQT+H8LAAZg@mail.gmail.com>
Subject: Re: [PATCH V6 00/24] Add support UHS-II for GL9755
To:     ulf.hansson@linaro.org, adrian.hunter@intel.com
Cc:     linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
        benchuanggli@gmail.com, HL.Liu@genesyslogic.com.tw,
        Greg.tu@genesyslogic.com.tw, takahiro.akashi@linaro.org,
        dlunev@chromium.org, Victor Shih <victor.shih@genesyslogic.com.tw>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Hi, Ulf and Adrian

Excuse me for disturbing your nice vacation, if you already have a
closer look at
 a paragraph at the series after you finish the vacation, could you let
 me know your comments first, let me check it first.

Thanks, Victor Shih

On Tue, Dec 13, 2022 at 5:01 PM Victor Shih <victorshihgli@gmail.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-#23: for sdhci
> patch#24:    for GL9755
>
> Changes in v6 (Dec. 12, 2022)
> * rebased to the linux-kernel-v6.1.0-rc8 in Ulf Hansson next branch.
> * 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.
> * according to the guidance and comments provided by
>   Adrian Hunter, Ben Chuang to implement the UHS-2
>   Host function based on the patches of the
>   [V5,00/26] Add support UHS-II for GL9755[6].
> * The uhs2_post_attach_sd() has implemented in Patch#6 and
>   Patch#17 so drop the V5 version of the Patch#23.
> * Modifies the usage of the flags used by the sdhci host for
>   MMC_UHS2_INITIALIZED.
> * Patch#5: Drop unused definitions and functions.
> * Patch#7: Rename definitions.
>            Use BIT() GENMASK() in some cases.
> * Patch#8: Merge V5 version of Patch[7] and Patch[9] into
>            V6 version of Patch[8].
> * Patch#9: Drop unnecessary function.
>            Rename used definitions.
> * Patch#10: Drop unnecessary function and simplify some code.
> * Patch#11: Drop unnecessary function.
>             Add new mmc_opt_regulator_set_ocr function.
> * Patch#13: Drop unnecessary function.
>             Use GENMASK() and FIELD_PREP() in some cases.
> * Patch#14: Drop unnecessary function.
>             Modify return value in some function.
>             Use GENMASK() and FIELD_PREP() in some cases.
> * Patch#15: Drop unnecessary function.
>             Rename used definitions.
>             Use GENMASK() and FIELD_GET() in some cases.
>             Wrap at 100 columns in some functions.
> * Patch#16: Drop unnecessary function.
> * Patch#17: Drop unnecessary function.
>             Drop the unnecessary parameter when call the DBG()
>             function.
>             Rename used definitions.
>             Cancel the export state of some functions.
>             Use GENMASK() and FIELD_PREP() in some cases.
> * Patch#18: Drop unnecessary function.
>             Add uhs2_dev_cmd function to simplify some functions.
>             Rename used definitions.
>             Cancel the export state of some functions.
>             Use GENMASK() and FIELD_PREP() in some cases.
> * Patch#19: Drop unnecessary function.
>             Add sdhci_uhs2_mode() in some functions.
>             Rename used definitions.
>             Cancel the export state of some functions.
> * Patch#20: Add new complete_work_fn/thread_irq_fn variables in
>             struct sdhci_host.
>             Use complete_work_fn/thread_irq_fn variables in
>             sdhci_alloc_host()/sdhci_uhs2_add_host().
>             Rename used definitions.
> * Patch[24]: Rename used definitions.
>
> 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/
> [6] https://patchwork.kernel.org/project/linux-mmc/cover/20221019110647.11076-1-victor.shih@genesyslogic.com.tw/
>
> ----------------- original cover letter from v5 -----------------
> 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. 19, 2022)
> * rebased to the linux-kernel-v6.1-rc1 in Ulf Hansson next branch.
> * 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/
>
> ----------------- original cover letter from v3.1 -----------------
> This is an interim snapshot of our next version, v4, for enabling
> UHS-II on MMC/SD.
>
> It is focused on 'sdhci' side to address Adrian's comments regarding
> "modularising" sdhci-uhs2.c.
> The whole aim of this version is to get early feedback from Adrian (and
> others) on this issue. Without any consensus about the code structure,
> it would make little sense to go further ahead on sdhci side.
> (Actually, Adrian has made no comments other than "modularising" so far.)
>
> I heavily reworked/refactored sdhci-uhs2.c and re-organised the patch
> set to meet what I believe Adrian expects; no UHS-II related code in
> Legacy (UHS-I) code or sdhci.c.
>
> Nevertheless, almost of all changes I made are trivial and straightforward
> in this direction, and I believe that there is no logic changed since v3
> except sdhci_uhs2_irq(), as ops->irq hook, where we must deal with UHS-II
> command sequences in addition to UHS-II errors. So I added extra handlings.
>
> I admit that there is plenty of room for improvements (for example,
> handling host->flags), but again the focal point here is how sdhci-uhs2.c
> should be built as a module.
>
> Please review this series (particularly Patch#8-#26 and #27) from this
> viewpoint in the first place.
> (Ben is working on 'host' side but there is no change on 'host' side
> in this submission except a minor tweak.)
>
> Thanks,
> -Takahiro Akashi
>
> ------ original cover letter from v3 ------
> 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-#7: for core
> patch#8-#17: for sdhci
> patch#18-#21: for GL9755
>
> Tests
> =====
> Ran 'dd' command to evaluate the performance:
> (SanDisk UHS-II card on GL9755 controller)
>                              Read    Write
> UHS-II disabled (UHS-I): 88.3MB/s 60.7MB/s
> UHS-II enabled         :  206MB/s   80MB/s
>
> TODO
> ====
> - replace some define with BIT macro
>
> 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
>
> Changes in v3 (Jul. 10, 2020)
> * rebased to v5.8-rc4
> * add copyright notice
> * reorganize the patch set and split some commits into smaller ones
> * separate uhs-2 headers from others
> * correct wrong spellings
> * fix most of checkpatch warnings/errors
> * remove all k[cz]alloc() from the code
> * guard sdhci-uhs2 specific code with
>       'if (IS_ENABLED(CONFIG_MMC_SDHCI_UHS2))'
> * make sdhci-uhs2.c as a module
> * trivial changes, including
>   - rename back sdhci-core.c to sdhci.c
>   - allow vendor code to disable uhs2 if v4_mode == 0
>       in __sdhci_add_host()
>   - merge uhs2_power_up() into mmc_power_up()
>   - remove flag_uhs2 from mmc_attach_sd()
>   - add function descriptions to EXPORT'ed functions
>   - other minor code optimization
>
> Changes in v2 (Jan. 9, 2020)
> * rebased to v5.5-rc5
>
> AKASHI Takahiro (1):
>   mmc: sdhci-pci: add UHS-II support framework
>
> Ben Chuang (1):
>   mmc: sdhci-uhs2: add post-mmc_attach_sd hook
>
> Ulf Hansson (3):
>   mmc: core: Prepare to support SD UHS-II cards
>   mmc: core: Announce successful insertion of an SD UHS-II card
>   mmc: core: Extend support for mmc regulators with a vqmmc2
>
> Victor Shih (19):
>   mmc: core: Cleanup printing of speed mode at card insertion
>   mmc: core: Add definitions for SD UHS-II cards
>   mmc: core: Support UHS-II card control and access
>   mmc: sdhci: add UHS-II related definitions in headers
>   mmc: sdhci: add UHS-II module and add a kernel configuration
>   mmc: sdhci-uhs2: dump UHS-II registers
>   mmc: sdhci-uhs2: add reset function and uhs2_mode function
>   mmc: sdhci-uhs2: add set_power() to support vdd2
>   mmc: sdhci-uhs2: skip signal_voltage_switch()
>   mmc: sdhci-uhs2: add set_timeout()
>   mmc: sdhci-uhs2: add set_ios()
>   mmc: sdhci-uhs2: add detect_init() to detect the interface
>   mmc: sdhci-uhs2: add clock operations
>   mmc: sdhci-uhs2: add uhs2_control() to initialise the interface
>   mmc: sdhci-uhs2: add request() and others
>   mmc: sdhci-uhs2: add irq() and others
>   mmc: sdhci-uhs2: add add_host() and others to set up the driver
>   mmc: sdhci-uhs2: add pre-detect_init hook
>   mmc: sdhci-pci-gli: enable UHS-II mode for GL9755
>
>  drivers/mmc/core/Makefile         |    2 +-
>  drivers/mmc/core/block.c          |    6 +-
>  drivers/mmc/core/bus.c            |   37 +-
>  drivers/mmc/core/core.c           |   37 +-
>  drivers/mmc/core/core.h           |    1 +
>  drivers/mmc/core/host.h           |    4 +
>  drivers/mmc/core/mmc_ops.c        |   25 +-
>  drivers/mmc/core/mmc_ops.h        |    1 +
>  drivers/mmc/core/regulator.c      |   34 +
>  drivers/mmc/core/sd.c             |   11 +-
>  drivers/mmc/core/sd.h             |    3 +
>  drivers/mmc/core/sd_ops.c         |   13 +
>  drivers/mmc/core/sd_ops.h         |    3 +
>  drivers/mmc/core/sd_uhs2.c        | 1400 ++++++++++++++++++++++++++++
>  drivers/mmc/host/Kconfig          |   10 +
>  drivers/mmc/host/Makefile         |    1 +
>  drivers/mmc/host/sdhci-pci-core.c |   16 +-
>  drivers/mmc/host/sdhci-pci-gli.c  |  309 ++++++-
>  drivers/mmc/host/sdhci-pci.h      |    3 +
>  drivers/mmc/host/sdhci-uhs2.c     | 1414 +++++++++++++++++++++++++++++
>  drivers/mmc/host/sdhci-uhs2.h     |  188 ++++
>  drivers/mmc/host/sdhci.c          |  343 ++++---
>  drivers/mmc/host/sdhci.h          |  100 +-
>  include/linux/mmc/card.h          |   47 +
>  include/linux/mmc/core.h          |   13 +
>  include/linux/mmc/host.h          |   91 ++
>  include/linux/mmc/sd_uhs2.h       |  263 ++++++
>  27 files changed, 4205 insertions(+), 170 deletions(-)
>  create mode 100644 drivers/mmc/core/sd_uhs2.c
>  create mode 100644 drivers/mmc/host/sdhci-uhs2.c
>  create mode 100644 drivers/mmc/host/sdhci-uhs2.h
>  create mode 100644 include/linux/mmc/sd_uhs2.h
>
> --
> 2.25.1
>