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* [RFC PATCH V3 00/21] Add support UHS-II for GL9755
@ 2020-07-10 11:07 Ben Chuang
  2020-07-17 10:17 ` Ulf Hansson
  0 siblings, 1 reply; 3+ messages in thread
From: Ben Chuang @ 2020-07-10 11:07 UTC (permalink / raw)
  To: adrian.hunter, ulf.hansson
  Cc: linux-mmc, linux-kernel, ben.chuang, takahiro.akashi, greg.tu,
	Ben Chuang

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 (15):
  mmc: core: UHS-II support, modify power-up sequence
  mmc: core: UHS-II support, skip set_chip_select()
  mmc: core: UHS-II support, skip TMODE setup in some cases
  mmc: core: UHS-II support, generate UHS-II SD command packet
  mmc: core: UHS-II support, set APP_CMD bit if necessary
  mmc: sdhci: add a kernel configuration for enabling UHS-II support
  mmc: sdhci: add UHS-II related definitions in headers
  mmc: sdhci: UHS-II support, dump UHS-II registers
  mmc: sdhci: UHS-II support, export host operations to core
  mmc: sdhci: UHS-II support, skip signal_voltage_switch()
  mmc: sdhci: UHS-II support, handle vdd2 in case of power-off
  mmc: sdhci: UHS-II support, modify set_power() to handle vdd2
  mmc: sdhci: UHS-II support, export helper functions to a module
  mmc: sdhci: UHS-II support, implement operations as a module
  mmc: core: add post-mmc_attach_sd hook

Ben Chuang (6):
  mmc: add UHS-II related definitions in public headers
  mmc: core: UHS-II support, try to select UHS-II interface
  mmc: sdhci: UHS-II support, add hooks for additional operations
  mmc: sdhci-uhs2: add pre-detect_init hook
  mmc: sdhci-uhs2: add post-mmc_attach_sd hook
  mmc: sdhci-pci-gli: enable UHS-II mode for GL9755

 drivers/mmc/core/Makefile         |   2 +-
 drivers/mmc/core/block.c          |   7 +-
 drivers/mmc/core/bus.c            |   5 +-
 drivers/mmc/core/core.c           | 119 +++-
 drivers/mmc/core/regulator.c      |  14 +
 drivers/mmc/core/sd.c             |  32 ++
 drivers/mmc/core/sd_ops.c         |  12 +
 drivers/mmc/core/uhs2.c           | 874 ++++++++++++++++++++++++++++++
 drivers/mmc/core/uhs2.h           |  21 +
 drivers/mmc/host/Kconfig          |  10 +
 drivers/mmc/host/Makefile         |   1 +
 drivers/mmc/host/sdhci-omap.c     |   2 +-
 drivers/mmc/host/sdhci-pci-core.c |   4 +-
 drivers/mmc/host/sdhci-pci-gli.c  | 361 +++++++++++-
 drivers/mmc/host/sdhci-pxav3.c    |   4 +-
 drivers/mmc/host/sdhci-uhs2.c     | 797 +++++++++++++++++++++++++++
 drivers/mmc/host/sdhci-uhs2.h     | 215 ++++++++
 drivers/mmc/host/sdhci-xenon.c    |   4 +-
 drivers/mmc/host/sdhci.c          | 321 +++++++++--
 drivers/mmc/host/sdhci.h          | 113 +++-
 include/linux/mmc/card.h          |   1 +
 include/linux/mmc/core.h          |   6 +
 include/linux/mmc/host.h          |  31 ++
 include/linux/mmc/uhs2.h          | 268 +++++++++
 24 files changed, 3151 insertions(+), 73 deletions(-)
 create mode 100644 drivers/mmc/core/uhs2.c
 create mode 100644 drivers/mmc/core/uhs2.h
 create mode 100644 drivers/mmc/host/sdhci-uhs2.c
 create mode 100644 drivers/mmc/host/sdhci-uhs2.h
 create mode 100644 include/linux/mmc/uhs2.h

-- 
2.27.0


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [RFC PATCH V3 00/21] Add support UHS-II for GL9755
  2020-07-10 11:07 [RFC PATCH V3 00/21] Add support UHS-II for GL9755 Ben Chuang
@ 2020-07-17 10:17 ` Ulf Hansson
  2020-07-20  7:06   ` Ben Chuang
  0 siblings, 1 reply; 3+ messages in thread
From: Ulf Hansson @ 2020-07-17 10:17 UTC (permalink / raw)
  To: Ben Chuang
  Cc: Adrian Hunter, linux-mmc, Linux Kernel Mailing List, Ben Chuang,
	Takahiro Akashi, greg.tu

On Fri, 10 Jul 2020 at 13:07, Ben Chuang <benchuanggli@gmail.com> wrote:
>
> Summary
> =======
> These patches[1] support UHS-II and fix GL9755 UHS-II compatibility.

First of all, thanks for posting this - and my apologies for not
having the bandwidth to review the earlier versions.

>
> 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.

The above points to some specifications, which is good, but what I
really need to be able to do a proper review -  is an explanation of
*what*, *why* and *how* the series implements the UHS-II support.

To be clear, I don't need in-depth details, as that should be
described in each patch's commit message, but I would appreciate an
overall description of the approach you have taken to implement this.

The reason I need this is because UHS-II is a completely new
interface/protocol. If it wasn't because that a UHS-II card is also
required to be backwards compatible with the legacy SD interface, one
could even consider introducing an entirely new subsystem. Not saying
that we should, but just pointing out that the series is not trivial
to review.

That said, I am going to give it a real try to do the review. I will
try to focus on the overall approach, rather than on the details, at
least to start with.

>
> 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

I like these comparisons, thanks for sharing!

What UHS-II interface mode does you HW support? FD156, HD312, FD312 FD624?

>
> 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 (15):
>   mmc: core: UHS-II support, modify power-up sequence
>   mmc: core: UHS-II support, skip set_chip_select()
>   mmc: core: UHS-II support, skip TMODE setup in some cases
>   mmc: core: UHS-II support, generate UHS-II SD command packet
>   mmc: core: UHS-II support, set APP_CMD bit if necessary
>   mmc: sdhci: add a kernel configuration for enabling UHS-II support
>   mmc: sdhci: add UHS-II related definitions in headers
>   mmc: sdhci: UHS-II support, dump UHS-II registers
>   mmc: sdhci: UHS-II support, export host operations to core
>   mmc: sdhci: UHS-II support, skip signal_voltage_switch()
>   mmc: sdhci: UHS-II support, handle vdd2 in case of power-off
>   mmc: sdhci: UHS-II support, modify set_power() to handle vdd2
>   mmc: sdhci: UHS-II support, export helper functions to a module
>   mmc: sdhci: UHS-II support, implement operations as a module
>   mmc: core: add post-mmc_attach_sd hook
>
> Ben Chuang (6):
>   mmc: add UHS-II related definitions in public headers
>   mmc: core: UHS-II support, try to select UHS-II interface
>   mmc: sdhci: UHS-II support, add hooks for additional operations
>   mmc: sdhci-uhs2: add pre-detect_init hook
>   mmc: sdhci-uhs2: add post-mmc_attach_sd hook
>   mmc: sdhci-pci-gli: enable UHS-II mode for GL9755
>
>  drivers/mmc/core/Makefile         |   2 +-
>  drivers/mmc/core/block.c          |   7 +-
>  drivers/mmc/core/bus.c            |   5 +-
>  drivers/mmc/core/core.c           | 119 +++-
>  drivers/mmc/core/regulator.c      |  14 +
>  drivers/mmc/core/sd.c             |  32 ++
>  drivers/mmc/core/sd_ops.c         |  12 +
>  drivers/mmc/core/uhs2.c           | 874 ++++++++++++++++++++++++++++++

Nitpick:

I would prefer to prefix any new needed file with sd_*. In this case,
sd_uhs2.c|h.

>  drivers/mmc/core/uhs2.h           |  21 +
>  drivers/mmc/host/Kconfig          |  10 +
>  drivers/mmc/host/Makefile         |   1 +
>  drivers/mmc/host/sdhci-omap.c     |   2 +-
>  drivers/mmc/host/sdhci-pci-core.c |   4 +-
>  drivers/mmc/host/sdhci-pci-gli.c  | 361 +++++++++++-
>  drivers/mmc/host/sdhci-pxav3.c    |   4 +-
>  drivers/mmc/host/sdhci-uhs2.c     | 797 +++++++++++++++++++++++++++
>  drivers/mmc/host/sdhci-uhs2.h     | 215 ++++++++
>  drivers/mmc/host/sdhci-xenon.c    |   4 +-
>  drivers/mmc/host/sdhci.c          | 321 +++++++++--
>  drivers/mmc/host/sdhci.h          | 113 +++-
>  include/linux/mmc/card.h          |   1 +
>  include/linux/mmc/core.h          |   6 +
>  include/linux/mmc/host.h          |  31 ++
>  include/linux/mmc/uhs2.h          | 268 +++++++++
>  24 files changed, 3151 insertions(+), 73 deletions(-)
>  create mode 100644 drivers/mmc/core/uhs2.c
>  create mode 100644 drivers/mmc/core/uhs2.h
>  create mode 100644 drivers/mmc/host/sdhci-uhs2.c
>  create mode 100644 drivers/mmc/host/sdhci-uhs2.h
>  create mode 100644 include/linux/mmc/uhs2.h
>
> --
> 2.27.0
>

Kind regards
Uffe

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [RFC PATCH V3 00/21] Add support UHS-II for GL9755
  2020-07-17 10:17 ` Ulf Hansson
@ 2020-07-20  7:06   ` Ben Chuang
  0 siblings, 0 replies; 3+ messages in thread
From: Ben Chuang @ 2020-07-20  7:06 UTC (permalink / raw)
  To: Ulf Hansson
  Cc: Adrian Hunter, linux-mmc, Linux Kernel Mailing List, Ben Chuang,
	Takahiro Akashi, greg.tu

On Fri, Jul 17, 2020 at 6:18 PM Ulf Hansson <ulf.hansson@linaro.org> wrote:
>
> On Fri, 10 Jul 2020 at 13:07, Ben Chuang <benchuanggli@gmail.com> wrote:
> >
> > Summary
> > =======
> > These patches[1] support UHS-II and fix GL9755 UHS-II compatibility.
>
> First of all, thanks for posting this - and my apologies for not
> having the bandwidth to review the earlier versions.
>
> >
> > 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.
>
> The above points to some specifications, which is good, but what I
> really need to be able to do a proper review -  is an explanation of
> *what*, *why* and *how* the series implements the UHS-II support.

What:
 1. detect UHS-II interface of a card
 2. change card to UHS-II mode
 3. send SD command through SD-TRAN
 4. go back to legacy interface if not detect UHS-II interface

Why:
 1. UHS-II card support Legacy Interface and UHS-II interface

How:
  a) Using 3.13.2 Card Interface Detection Sequence
  1. power up, host provides RCLK and STB.L to D0.lane.
  2. host waits D1.lane to change EIDL to STB.L
  3. host starts UHS-II initialization if STB.L

>
> To be clear, I don't need in-depth details, as that should be
> described in each patch's commit message, but I would appreciate an
> overall description of the approach you have taken to implement this.
>
> The reason I need this is because UHS-II is a completely new
> interface/protocol. If it wasn't because that a UHS-II card is also
> required to be backwards compatible with the legacy SD interface, one
> could even consider introducing an entirely new subsystem. Not saying
> that we should, but just pointing out that the series is not trivial
> to review.
>
> That said, I am going to give it a real try to do the review. I will
> try to focus on the overall approach, rather than on the details, at
> least to start with.
>

Thank you, I will be patient.

> >
> > 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
>
> I like these comparisons, thanks for sharing!
>
> What UHS-II interface mode does you HW support? FD156, HD312, FD312 FD624?

GL9755 supports up to HD312.

>
> >
> > 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 (15):
> >   mmc: core: UHS-II support, modify power-up sequence
> >   mmc: core: UHS-II support, skip set_chip_select()
> >   mmc: core: UHS-II support, skip TMODE setup in some cases
> >   mmc: core: UHS-II support, generate UHS-II SD command packet
> >   mmc: core: UHS-II support, set APP_CMD bit if necessary
> >   mmc: sdhci: add a kernel configuration for enabling UHS-II support
> >   mmc: sdhci: add UHS-II related definitions in headers
> >   mmc: sdhci: UHS-II support, dump UHS-II registers
> >   mmc: sdhci: UHS-II support, export host operations to core
> >   mmc: sdhci: UHS-II support, skip signal_voltage_switch()
> >   mmc: sdhci: UHS-II support, handle vdd2 in case of power-off
> >   mmc: sdhci: UHS-II support, modify set_power() to handle vdd2
> >   mmc: sdhci: UHS-II support, export helper functions to a module
> >   mmc: sdhci: UHS-II support, implement operations as a module
> >   mmc: core: add post-mmc_attach_sd hook
> >
> > Ben Chuang (6):
> >   mmc: add UHS-II related definitions in public headers
> >   mmc: core: UHS-II support, try to select UHS-II interface
> >   mmc: sdhci: UHS-II support, add hooks for additional operations
> >   mmc: sdhci-uhs2: add pre-detect_init hook
> >   mmc: sdhci-uhs2: add post-mmc_attach_sd hook
> >   mmc: sdhci-pci-gli: enable UHS-II mode for GL9755
> >
> >  drivers/mmc/core/Makefile         |   2 +-
> >  drivers/mmc/core/block.c          |   7 +-
> >  drivers/mmc/core/bus.c            |   5 +-
> >  drivers/mmc/core/core.c           | 119 +++-
> >  drivers/mmc/core/regulator.c      |  14 +
> >  drivers/mmc/core/sd.c             |  32 ++
> >  drivers/mmc/core/sd_ops.c         |  12 +
> >  drivers/mmc/core/uhs2.c           | 874 ++++++++++++++++++++++++++++++
>
> Nitpick:
>
> I would prefer to prefix any new needed file with sd_*. In this case,
> sd_uhs2.c|h.

OK, change uhs2.c and uhs2.h to sd_uhs2.c and sd_uhs2.h later.

>
> >  drivers/mmc/core/uhs2.h           |  21 +
> >  drivers/mmc/host/Kconfig          |  10 +
> >  drivers/mmc/host/Makefile         |   1 +
> >  drivers/mmc/host/sdhci-omap.c     |   2 +-
> >  drivers/mmc/host/sdhci-pci-core.c |   4 +-
> >  drivers/mmc/host/sdhci-pci-gli.c  | 361 +++++++++++-
> >  drivers/mmc/host/sdhci-pxav3.c    |   4 +-
> >  drivers/mmc/host/sdhci-uhs2.c     | 797 +++++++++++++++++++++++++++
> >  drivers/mmc/host/sdhci-uhs2.h     | 215 ++++++++
> >  drivers/mmc/host/sdhci-xenon.c    |   4 +-
> >  drivers/mmc/host/sdhci.c          | 321 +++++++++--
> >  drivers/mmc/host/sdhci.h          | 113 +++-
> >  include/linux/mmc/card.h          |   1 +
> >  include/linux/mmc/core.h          |   6 +
> >  include/linux/mmc/host.h          |  31 ++
> >  include/linux/mmc/uhs2.h          | 268 +++++++++
> >  24 files changed, 3151 insertions(+), 73 deletions(-)
> >  create mode 100644 drivers/mmc/core/uhs2.c
> >  create mode 100644 drivers/mmc/core/uhs2.h
> >  create mode 100644 drivers/mmc/host/sdhci-uhs2.c
> >  create mode 100644 drivers/mmc/host/sdhci-uhs2.h
> >  create mode 100644 include/linux/mmc/uhs2.h
> >
> > --
> > 2.27.0
> >
>
> Kind regards
> Uffe

^ permalink raw reply	[flat|nested] 3+ messages in thread

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Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-10 11:07 [RFC PATCH V3 00/21] Add support UHS-II for GL9755 Ben Chuang
2020-07-17 10:17 ` Ulf Hansson
2020-07-20  7:06   ` Ben Chuang

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