Re: [PATCH V19 00/22] Add support UHS-II for GL9755 and GL9767

From: Adrian Hunter
Date: Mon Sep 02 2024 - 14:45:17 EST

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On 29/08/24 13:15, Victor Shih wrote:
> From: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
>
> Summary
> =======
> These patches[1] support UHS-II and fix GL9755 and GL9767
> UHS-II compatibility.

As before, a couple of small things (see replies to the relevent
emails) but, as I wrote for V17 ad V18, this is essentially
OK from my point of view.

>
> 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-#20: for sdhci
> patch#21: for GL9755
> patch#22: for GL9767
>
> Tests
> =====
> Ran 'dd' command to evaluate the performance:
> (SanDisk UHS-II card on GL9755 controller)
> Read Write
> UHS-II disabled (UHS-I): 84.8MB/s 53.6MB/s
> UHS-II enabled : 183MB/s 90.8MB/s
> (SanDisk UHS-II card on GL9767 controller)
> Read Write
> UHS-II disabled (UHS-I): 83.3MB/s 51.6MB/s
> UHS-II enabled : 202MB/s 73.3MB/s
>
> Changes in v19 (August. 29, 2024)
> * Rebase on latest mmc/next.
> * Patch#16: cmd->uhs2_cmd->uhs2_resp is always true, remove it from
> safety check in the __sdhci_uhs2_finish_command().
> * Patch#17: Corrected sdhci_uhs2_reset() parameter errors
> in the sdhci_uhs2_request_done().
> * Patch#21: Add sdhci_gli_enable_internal_clock() to simplify the code
> in the sdhci_gl9755_reset().
> * Patch#22: Use sdhci_gli_enable_internal_clock() to simplify the code
> in the sdhci_gl9767_reset().
> Directly reading the SDHCI_PRESENT_STATE register to replace
> the get_cd() avoids the possibility of the get_cd() sleeping
> in the sdhci_gl9767_set_card_detect_debounce_time().
> Refine the position of gli_set_9767() in the
> sdhci_gl9767_reset().
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20240802102229.10204-1-victorshihgli@xxxxxxxxx/
>
> ----------------- original cover letter from v18 -----------------
> Summary
> =======
> These patches[1] support UHS-II and fix GL9755 and GL9767
> 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-#20: for sdhci
> patch#21: for GL9755
> patch#22: for GL9767
>
> Tests
> =====
> Ran 'dd' command to evaluate the performance:
> (SanDisk UHS-II card on GL9755 controller)
> Read Write
> UHS-II disabled (UHS-I): 83.9MB/s 48.6MB/s
> UHS-II enabled : 199MB/s 74.3MB/s
> (SanDisk UHS-II card on GL9767 controller)
> Read Write
> UHS-II disabled (UHS-I): 83.6MB/s 50.1MB/s
> UHS-II enabled : 183MB/s 77.8MB/s
>
> Changes in v18 (August. 02, 2024)
> * Rebase on latest mmc/next.
> * Patch#17: Modify the judgment condition in sdhci_uhs2_reset_cmd_data()
> and replace it from mmc_card_uhs2()
> to host->mmc->uhs2_sd_tran flag.
> * Patch#22: Add new register settings for gl9767.
> Add card_event in the sdhci_ops for gl9767.
> Add sdhci_gl9767_set_card_detect_debounce_time()
> to configure the gl9767.
> Adjust the sdhci_gl9767_reset() process for gl9767.
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20240620104444.5862-1-victorshihgli@xxxxxxxxx/
>
> ----------------- original cover letter from v17 -----------------
> Summary
> =======
> These patches[1] support UHS-II and fix GL9755 and GL9767
> 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-#20: for sdhci
> patch#21: for GL9755
> patch#22: for GL9767
>
> Changes in v17 (June. 20, 2024)
> * Rebase on latest mmc/next.
> * Drop patch#8 of uhs2 patches series v16.
> * Patch#11: Move the sdhci_uhs2_reset_cmd_data() to the other patch
> it was used for the first time.
> * Patch#12: Export sdhci_uhs2_set_power() function.
> * Patch#16: Add new parameter to __sdhci_finish_data_common().
> * Patch#17: Add sdhci_uhs2_reset_cmd_data() and sdhci_uhs2_needs_reset() to
> resolve the data error or cmd error.
> * Patch#21: Rname gl9755_overcurrent_event_enable() to
> sdhci_gli_overcurrent_event_enable().
> * Patch#22: Use mmc_card_uhs2() to simplify the code in the
> sdhci_gl9767_reset().
> Use mmc_card_uhs2() to simplify the code in the
> sdhci_gl9767_set_power().
> Add sdhci_gli_overcurrent_event_enable() to
> sdhci_gl9767_set_power().
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20240522110909.10060-1-victorshihgli@xxxxxxxxx/
>
> ----------------- original cover letter from v16 -----------------
> Summary
> =======
> These patches[1] support UHS-II and fix GL9755 and GL9767
> 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-#8: for core
> patch#9-#21: for sdhci
> patch#22: for GL9755
> patch#23: for GL9767
>
> Changes in v16 (May. 22, 2024)
> * rebased to the linux-kernel-v6.9.0-rc2 in Ulf Hansson next branch.
> * according to the comments provided by Adrian Hunter to modify the
> patches base on the [V14 00/21] Add support UHS-II for GL9755.
> * Patch#8: Separate the Error Recovery mechanism from patch#7 to patch#8.
> * Patch#16: Remove irrelevant definition in the sdhci_calc_timeout_uhs2().
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20240123062827.8525-1-victorshihgli@xxxxxxxxx/
>
> ----------------- original cover letter from v15 -----------------
> Summary
> =======
> These patches[1] support UHS-II and fix GL9755 and GL9767
> 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-#20: for sdhci
> patch#21: for GL9755
> patch#22: for GL9767
>
> Changes in v15 (April. 22, 2024)
> * rebased to the linux-kernel-v6.9.0-rc2 in Ulf Hansson next branch.
> * according to the comments provided by Adrian Hunter to modify the
> patches base on the [V14 00/21] Add support UHS-II for GL9755.
> * Patch#07: Move struct uhs2_command uhs2_cmd to struct mmc_request and
> modify whatever other changers to make it work.
> Refer the SD Host Controller Standard Specification
> Section 3.10 to add Error Recovery mechanism to recover
> the command error.
> * Patch#11: Refer the SD Host Controller Standard Specification
> Section 3.10 to add reset command data mechanism.
> * Patch#15: Resolve merge conflicts and reduce unnecessary line breaks.
> * Patch#16: Adjust the parameters used in the __sdhci_uhs2_finish_command()
> to match changes in the Patch#7.
> * Patch#21: Adjust gl9755_vendor_init() to the correct function.
> * Patch#22: Add gl9767 to support uhs2 function.
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20240123062827.8525-1-victorshihgli@xxxxxxxxx/
>
> ----------------- original cover letter from v14 -----------------
> 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-#20: for sdhci
> patch#21: for GL9755
>
> Changes in v14 (January. 23, 2024)
> * rebased to the linux-kernel-v6.7.0-rc4 in Ulf Hansson next branch.
> * according to the comments provided by Adrian Hunter to modify the
> patches base on the [V13 00/21] Add support UHS-II for GL9755.
> * Patch#03: Move mmc_card_uhs2() to include/linux/mmc/host.h, so that
> mmc_card_uhs2() can be available for host drivers.
> * Patch#10: Use mmc_card_uhs2() to stead sdhci_uhs2_mode() in the
> sdhci_uhs2_dump_regs().
> * Patch#11: Since mmc_card_uhs2() is the same as sdhci_uhs2_mode(), so
> drop sdhci_uhs2_mode() and use mmc_card_uhs2() instead of
> sdhci_uhs2_mode().
> * Patch#13: Use mmc_card_uhs2() to stead sdhci_uhs2_mode() in the
> sdhci_uhs2_set_timeout().
> * Patch#14: Use mmc_card_uhs2() to stead sdhci_uhs2_mode() in the
> sdhci_uhs2_set_ios().
> * Patch#16: Use mmc_card_uhs2() to stead sdhci_uhs2_mode() in the
> sdhci_uhs2_request().
> * Patch#17: Use mmc_card_uhs2() to stead sdhci_uhs2_mode() in the
> sdhci_uhs2_complete_work(), sdhci_uhs2_irq() and
> sdhci_uhs2_thread_irq().
> * Patch#18: Use mmc_card_uhs2() to stead sdhci_uhs2_mode() in the
> __sdhci_uhs2_remove_host().
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20230915094351.11120-1-victorshihgli@xxxxxxxxx/
>
> ----------------- original cover letter from v13 -----------------
> 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-#20: for sdhci
> patch#21: for GL9755
>
> Changes in v13 (November. 17, 2023)
> * rebased to the linux-kernel-v6.7.0-rc1 in Ulf Hansson next branch.
> * according to the comments provided by Adrian Hunter to modify the
> patches base on the [V12 00/23] Add support UHS-II for GL9755.
> * according to the comments provided by Ulf Hansson to modify the
> patches base on the [V12 00/23] Add support UHS-II for GL9755.
> * Add new patch#6 to re-factoring the code.
> * Patch#7: Separate __mmc_go_idle() into one patch for re-factorring the code.
> Move mmc_decode_scr declaration to sd.h.
> Ues uhs2_sd_tran to stead MMC_UHS2_SD_TRAN.
> Drop unnecessary comment.
> * Patch#11: Use ios timing to stead MMC_UHS2_SUPPORT for indicate the UHS2 mode.
> * Patch#12: Drop use vmmc2.
> Modify comment message.
> * Patch#13: Modify comment message.
> * Patch#14: Add judgment condition for power mode in the __sdhci_uhs2_set_ios().
> Modify comment message.
> * Patch#15: Merge Patch#15, Patch#16 and Patch#17 of v12 version into Patch#15 in v13 version.
> Use definitions to simplify code.
> Modify comment message.
> * Patch#16: Re-order function to avoid declaration.
> Remove unnecessary function.
> * Patch#17: Re-order function to avoid declaration.
> Remove unnecessary definitions.
> * Patch#18: Re-order function to avoid declaration.
> Use vqmmc2 to stead vmmc2.
> * Patch#21: Ues uhs2_sd_tran to stead MMC_UHS2_SD_TRAN.
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20230915094351.11120-1-victorshihgli@xxxxxxxxx/
>
> ----------------- original cover letter from v12 -----------------
> 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-#22: for sdhci
> patch#23: for GL9755
>
> Changes in v12 (September. 15, 2023)
> * rebased to the linux-kernel-v6.6.0-rc1 in Ulf Hansson next branch.
> * according to the comments provided by Adrian Hunter to modify the
> patches base on the [V11 00/23] Add support UHS-II for GL9755.
> * according to the comments provided by Ulf Hansson to modify the
> patches base on the [V11 00/23] Add support UHS-II for GL9755.
> * Patch#5: Remove unused max_current_180_vdd2.
> * Patch#6: Use mmc_op_multi() to check DCMD which supports multi
> read/write in mmc_uhs2_prepare_cmd().
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20230908095330.12075-1-victorshihgli@xxxxxxxxx/
>
> ----------------- original cover letter from v11 -----------------
> 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-#22: for sdhci
> patch#23: for GL9755
>
> Changes in v11 (September. 08, 2023)
> * rebased to the linux-kernel-v6.5.0-rc5 in Ulf Hansson next branch.
> * according to the comments provided by Adrian Hunter to modify the
> patches base on the [V10 00/23] Add support UHS-II for GL9755.
> * Patch#18: Drop the check mmc_card_uhs2_hd_mode(host->mmc)
> in sdhci_uhs2_set_transfer_mode().
> * Patch#20: Remove unused ocr_avail_uhs2.
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20230721101349.12387-1-victorshihgli@xxxxxxxxx/
>
> ----------------- original cover letter from v10 -----------------
> 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-#22: for sdhci
> patch#23: for GL9755
>
> Changes in v10 (August. 18, 2023)
> * rebased to the linux-kernel-v6.5.0-rc5 in Ulf Hansson next branch.
> * according to the comments provided by Ulf Hansson to modify the
> patches base on the [V9 00/23] Add support UHS-II for GL9755.
> * Patch#2: Drop unnecessary definitions and code.
> * Patch#3: Modify the commit message.
> * Patch#4: Modify the commit message.
> * Patch#5: Drop unnecessary definitions.
> * Patch#6: Move some definitions of PatchV9[02/23] to PatchV10[06/23].
> Move some definitions of PatchV9[05/23] to PatchV10[06/23].
> Drop do_multi in the mmc_blk_rw_rq_prep().
> Use tmode_half_duplex to instead of uhs2_tmode0_flag.
> Move entire control of the tmode into mmc_uhs2_prepare_cmd().
> * Patch#11: Move some definitions of PatchV9[05/23] to PatchV10[11/23].
> * Patch#18: Use tmode_half_duplex to instead of uhs2_tmode0_flag
> in sdhci_uhs2_set_transfer_mode().
> * Patch#20: Move some definitions of PatchV9[05/23] to PatchV10[20/23].
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20230721101349.12387-1-victorshihgli@xxxxxxxxx/
>
> ----------------- original cover letter from v9 -----------------
> 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-#22: for sdhci
> patch#23: for GL9755
>
> Changes in v9 (July. 21, 2023)
> * rebased to the linux-kernel-v6.5.0-rc1 in Ulf Hansson next branch.
> * according to the comments provided by Adrian Hunter to modify the
> patches base on the [V8 00/23] Add support UHS-II for GL9755.
> * Patch#2: move sd_uhs2_operation definition of PatchV8[05/23]
> to PatchV9[02/23] for avoid compilation errors.
> move uhs2_control definition of PatchV8[05/23]
> to PatchV9[02/23] for avoid compilation errors.
> move mmc_host flags definition of PatchV8[05/23]
> to PatchV9[02/23] for avoid compilation errors.
> move mmc_host flags MMC_UHS2_SUPPORT definition of
> PatchV8[05/23] to PatchV9[02/23] for avoid compilation errors.
> move mmc_host flags MMC_UHS2_SD_TRAN definition of
> PatchV8[05/23] to PatchV9[02/23] for avoid compilation errors.
> * Patch#7: Modify the commit message.
> * Patch#8: Modify the commit message.
> * Patch#11: Modify annotations in sdhci_get_vdd_value().
> * Patch#14: Simplity the turning_on_clk in sdhci_set_ios().
> * Patch#18: Modify the annotations in __sdhci_uhs2_send_command().
> * Patch#19: Cancel export state of sdhci_set_mrq_done() function.
> * Patch#23: Rename gl9755_pre_detect_init() to sdhci_gli_pre_detect_init().
> Rename gl9755_uhs2_reset_sd_tran() to
> sdhci_gli_uhs2_reset_sd_tran().
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20230621100151.6329-1-victorshihgli@xxxxxxxxx/
>
> ----------------- original cover letter from v8 -----------------
> 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-#22: for sdhci
> patch#23: for GL9755
>
> Changes in v8 (June. 21, 2023)
> * rebased to the linux-kernel-v6.4.0-rc6 in Ulf Hansson next branch.
> * fix most of checkpatch warnings/errors.
> * according to the comments provided by Adrian Hunter to modify the
> patches base on the [V7 00/23] Add support UHS-II for GL9755.
> * Patch#6: Add MMC_UHS2_SUPPORT to be cleared in sd_uhs2_detect().
> Modify return value in sd_uhs2_attach().
> * Patch#7: Use tabs instead of spaces.
> * Patch#8: Modify MODULE_LICENSE from "GPL v2" to "GPL".
> * Patch#10: Adjust the position of matching brackets.
> * Patch#11: Adjust the position of matching brackets.
> Add the initial value of the pwr in sdhci_uhs2_set_power().
> * Patch#13: Initialization be combined with declaration and realigned
> in sdhci_calc_timeout_uhs2().
> Forward declare struct mmc_command in sdhci_uhs2.h.
> * Patch#14: Add the judgment formula for MMC_TIMING_SPEED_A_HD,
> MMC_TIMING_SPEED_B and MMC_TIMING_SPEED_B_HD in
> __sdhci_uhs2_set_ios().
> Add the switch case for MMC_TIMING_SPEED_A_HD,
> MMC_TIMING_SPEED_B and MMC_TIMING_SPEED_B_HD in
> sdhci_get_preset_value().
> mmc_opt_regulator_set_ocr() to instead of
> mmc_regulator_set_ocr() in sdhci_uhs2_set_ios().
> * Patch#15: usleep_range() to instead of udelay() in
> sdhci_uhs2_interface_detect().
> read_poll_timeout() to instead of read_poll_timeout_atomic()
> in sdhci_uhs2_interface_detect().
> Modify return value in sdhci_uhs2_do_detect_init().
> * Patch#16: Remove unnecessary include file.
> read_poll_timeout() to instead of read_poll_timeout_atomic()
> in sdhci_uhs2_enable_clk().
> Put the comment on the end and put the lines in descending
> line length in sdhci_uhs2_enable_clk().
> Modify return value in sdhci_uhs2_enable_clk().
> * Patch#17: Reorder the definitions and lose the parentheses in
> sdhci_uhs2_set_config().
> read_poll_timeout() to instead of read_poll_timeout_atomic()
> in sdhci_uhs2_check_dormant().
> * Patch#18: Adjust the position of matching brackets in
> sdhci_uhs2_send_command_retry().
> Modify CameCase definition in __sdhci_uhs2_finish_command().
> Modify error message in __sdhci_uhs2_finish_command().
> sdhci_uhs2_send_command_retry() to instead of
> sdhci_uhs2_send_command() in sdhci_uhs2_request().
> Use sdhci_uhs2_mode() to simplify code in
> sdhci_uhs2_request_atomic().
> Add forward declaration for sdhci_send_command().
> * Patch#19: Forward declare struct mmc_request in sdhci_uhs2.h.
> Remove forward declaration of sdhci_send_command().
> Use mmc_dev() to simplify code in sdhci_request_done_dma().
> * Patch#20: Change return type to void for __sdhci_uhs2_add_host_v4().
> Remove unused variables in __sdhci_uhs2_add_host_v4().
> * Patch#22: Add config select MMC_SDHCI_UHS2 in Kconfig.
> * Patch#23: Use sdhci_get_vdd_value() to simplify code in
> gl9755_set_power().
> Use read_poll_timeout_atomic() to simplify code in
> sdhci_wait_clock_stable().
> Use read_poll_timeout_atomic() to simplify code in
> sdhci_gl9755_reset().
>
> Reference
> =========
> [1] https://gitlab.com/VictorShih/linux-uhs2.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/20230331105546.13607-1-victor.shih@xxxxxxxxxxxxxxxxxxx/
>
> ----------------- original cover letter from v7 -----------------
> 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-#22: for sdhci
> patch#23: for GL9755
>
> Changes in v7 (Mar. 31, 2023)
> * rebased to the linux-kernel-v6.3.0-rc3 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].
> * according to the guidance and comments provided by
> Ulf Hanssion, Adrian Hunter, Ben Chuang to implement the UHS-2
> Host function based on the patches of the
> [V6,00/24] Add support UHS-II for GL9755[7].
> * The uhs2_post_attach_sd() function is no longer needed so drop
> the V6 version of the Patch#22.
> * Modifies the usage of the flags used by the sdhci host for
> MMC_UHS2_INITIALIZED.
> * Patch#1: Drop unnecessary bracket.
> * Patch#2: Drop sd_uhs2_set_ios function.
> Used ->uhs2_control() callback for uhs2_set_ios
> in sd_uhs2_power_up().
> Used ->uhs2_control() callback for uhs2_set_ios
> in sd_uhs2_power_off().
> Drop MMC_TIMING_SD_UHS2 in favor of MMC_TIMING_UHS2_SPEED_A.
> Modify sd_uhs2_legacy_init to avoid the
> sd_uhs2_reinit cycle issue.
> * Patch#5: Drop unnecessary definitions.
> * Patch#6: Drop unnecessary function.
> Drop uhs2_state in favor of ios->timing.
> * Patch#7: Reorder values and positions of definitions.
> * Patch#9: Used sdhci_uhs2_mode function to simplify.
> * Patch#11: Drop pwr variable in sdhci_uhs2_set_power function.
> * Patch#14: Modify some descriptions.
> Drop unnecessary function.
> * Patch#15: Drop using uhs2_reset ops and use sdhci_uhs2_reset function
> in the sdhci_do_detect_init function.
> * Patch#17: Drop unnecessary function.
> * Patch#18: Drop unnecessary whitespace changes.
> Cancel the export state of some functions.
> * Patch#19: Drop unnecessary function.
> Used sdhci_uhs2_mode function to simplify.
> Modify some descriptions.
> Cancel the export state of some functions.
> * Patch#20: Drop using __sdhci_uhs2_host function and use
> __sdhci_add_host function in sdhci_uhs2_add_host function.
> Cancel the export state of some functions.
> * Patch#23: Drop using uhs2_post_attach_sd function.
>
> 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@xxxxxxxxxx/
> [5] https://patchwork.kernel.org/project/linux-mmc/cover/20220418115833.10738-1-jasonlai.genesyslogic@xxxxxxxxx/
> [6] https://patchwork.kernel.org/project/linux-mmc/cover/20221019110647.11076-1-victor.shih@xxxxxxxxxxxxxxxxxxx/
> [7] https://patchwork.kernel.org/project/linux-mmc/cover/20221213090047.3805-1-victor.shih@xxxxxxxxxxxxxxxxxxx/
>
> ----------------- original cover letter from v6 -----------------
> 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@xxxxxxxxxx/
> [5] https://patchwork.kernel.org/project/linux-mmc/cover/20220418115833.10738-1-jasonlai.genesyslogic@xxxxxxxxx/
> [6] https://patchwork.kernel.org/project/linux-mmc/cover/20221019110647.11076-1-victor.shih@xxxxxxxxxxxxxxxxxxx/
>
> ----------------- 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@xxxxxxxxxx/
> [5] https://patchwork.kernel.org/project/linux-mmc/cover/20220418115833.10738-1-jasonlai.genesyslogic@xxxxxxxxx/
>
> ----------------- 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
>
> Ben Chuang (1):
> mmc: sdhci-uhs2: add pre-detect_init hook
>
> Ulf Hansson (4):
> mmc: core: Cleanup printing of speed mode at card insertion
> 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 (17):
> mmc: core: Add definitions for SD UHS-II cards
> mmc: core: Add New function to re-factoring the code
> 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
> mmc: sdhci-uhs2: add set_power() to support vdd2
> mmc: sdhci-uhs2: add set_timeout()
> mmc: sdhci-uhs2: add set_ios()
> 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-pci: add UHS-II support framework
> mmc: sdhci-pci-gli: enable UHS-II mode for GL9755
> mmc: sdhci-pci-gli: enable UHS-II mode for GL9767
>
> drivers/mmc/core/Makefile | 2 +-
> drivers/mmc/core/bus.c | 38 +-
> drivers/mmc/core/core.c | 23 +-
> drivers/mmc/core/core.h | 1 +
> drivers/mmc/core/mmc_ops.c | 24 +-
> drivers/mmc/core/mmc_ops.h | 1 +
> drivers/mmc/core/regulator.c | 34 +
> drivers/mmc/core/sd.c | 10 +-
> drivers/mmc/core/sd.h | 5 +
> drivers/mmc/core/sd_ops.c | 9 +
> drivers/mmc/core/sd_ops.h | 13 +
> drivers/mmc/core/sd_uhs2.c | 1326 +++++++++++++++++++++++++++++
> 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 | 441 +++++++++-
> drivers/mmc/host/sdhci-pci.h | 3 +
> drivers/mmc/host/sdhci-uhs2.c | 1273 +++++++++++++++++++++++++++
> drivers/mmc/host/sdhci-uhs2.h | 190 +++++
> drivers/mmc/host/sdhci.c | 281 +++---
> drivers/mmc/host/sdhci.h | 75 +-
> include/linux/mmc/card.h | 36 +
> include/linux/mmc/core.h | 17 +
> include/linux/mmc/host.h | 80 ++
> include/linux/mmc/sd_uhs2.h | 240 ++++++
> 25 files changed, 4000 insertions(+), 149 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
>

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