Re: [PATCH v8 00/14] External ECC engines & Macronix support

[Miquel Raynal <miquel.raynal@bootlin.com>]

Hi Mark,

miquel.raynal@bootlin.com wrote on Tue, 21 Dec 2021 18:48:30 +0100:

> Hello all,
> 
> I've applied the beginning of the series (bindings + ECC part) in a
> branch named spi-mem-ecc on the MTD korg repository, hence now I am
> re-sending only the second halve, including spi-mem and spi changes,
> mostly. When that second part will be validated, I will apply it on top
> of the spi-mem-ecc branch and set an immutable tag, shared with the spi
> tree.

I was hoping for more feedback (from Tudor and perhaps Boris as well?)
so as we are in the middle of the Christmas/new year break I decided
not to apply this series for my next pull-request to Linus.

I will wait a bit more until -rc1 is out and then I will rebase the
first half of the series (already applied on the spi-mem-ecc branch on
the mtd repository) and add these 14 patches on top of it before sharing
it with you 'officially'.

Happy new year,
Miquèl

> 
> Cheers,
> Miquèl
> 
> Changes in v8:
> * Applied this patch from Pratyush at the beginning of my series:
>   https://lore.kernel.org/all/20210531181757.19458-5-p.yadav@ti.com/
>   Made the necessary changes in the following commits.
> * Changed the spi-mem-op ecc_en parameter to become ecc and match the
>   dtr parameter. Changed its type to "u8 : 1" as well for the same
>   reason. Moved it to the data sub-structure as advised by Pratyush.
> * Added the received Acks/R-by.
> 
> Changes in v7:
> * Added a macro to check if the caps are present or not before accessing
>   them. This allows for optional caps.
> * Dropped the 'no-caps' instance created in v6.
> * Reworked a bit all the patches using these caps to have a nice and
>   bisectable series, like adding missing static keywords.
> 
> Changes in v6:
> * Re-include the first patches because a few things have changed in the
>   bindings. These are only style changes as Rob asked to group every
>   property above or below the description field, which I applied to all
>   the binding commits, but without any further update.
> * Created a spi-mem capabilities structure. Put that one in the spi-mem
>   ops strucure and ensured that all the controllers provided one.
> * Created a default "no-caps" empty instance that controller drivers can
>   point to by default.
> * Dropped the spi_mem_generic_defaults_op() intermediate helper entirely
>   (not needed anymore).
> 
> Changes in v5:
> * Moved a helper in the core as it seems that it will be useful for
>   other ECC engines as well (Xiangsheng Hou for Mediatek will need it).
> * Changed the parameters of the spi_mem_generic_supports_op() function
>   in order to take a structure as input instead of a list of arguments,
>   which will be much easier to complement in the future if ever needed.
> 
> Changes in v4:
> * The first half of the series has been left aside (all the binding
>   changes + the external mode in the Macronix driver), now let's focus
>   on the pipelined mode.
> * Added the ecc_en spi_mem_op structure parameter in a dedicated commit.
> * Introduced a new helper for supporting generically the supported ops.
> * Used this new helper in the macronix driver.
> * By default all the other drivers would refuse a spi_mem_op with ecc_en
>   enabled.
> 
> Changes in v3:
> * Added Mark's R-by.
> * Added a commit changing the initialization order between the dirmaps
>   and the ECC engine so that the core might now if we are using a
>   pipelined engine or not.
> * Stopped creating additional dirmaps with ECC if the engine is not a
>   pipelined engine.
> * Solved the kernel test robot reports. In particular, I added a
>   dependency on MTD_NAND_ECC to Macronix SPI controller driver.
> * Added a patch to clean the NAND controller yaml file before moving
>   some bits to nand-chip.yaml. This addresses the comments made by Rob
>   about the useless allOf's.
> * Used platform_get_irq_byname_optional() in order to avoid useless
>   warnings when there is no IRQ.
> 
> Changes in v2:
> * Fixed the bindings and added Rob's acks when relevant.
> * Added locking in the ECC engine driver.
> * Brought more changes in the core in order to bring the ECC information
>   into the spi_mem_op structure with the idea of avoiding any races
>   between parallel calls on the same engine.
> * Reorganized the ECC driver entirely in order to have a per-engine mxic
>   structure plus a per-NAND context. This lead to a number of changes
>   internally which cannot all be listed.
> 
> Changes since the RFC:
> * Rebased on top of v5.15-rc1.
> * Fixed the dirmap configuration.
> * Added the various tags received.
> * Fixed the bindings as reported by the robots.
> * Fixed the return value of the helper counting bitflips.
> * Included a fix from Jaime Liao in the external pattern logic.
> * Added the yaml conversion of Macronix SPI controller description.
> * Added the yaml conversion of the SPI-NAND description.
> * Created a nand-chip.yaml file to share properties between SPI-NAND and
>   raw NAND.
> 
> Miquel Raynal (13):
>   spi: spi-mem: Introduce a capability structure
>   spi: spi-mem: Check the controller extra capabilities
>   spi: cadence-quadspi: Provide a capability structure
>   spi: mxic: Provide a capability structure
>   spi: spi-mem: Kill the spi_mem_dtr_supports_op() helper
>   spi: spi-mem: Add an ecc parameter to the spi_mem_op structure
>   mtd: spinand: Delay a little bit the dirmap creation
>   mtd: spinand: Create direct mapping descriptors for ECC operations
>   spi: mxic: Fix the transmit path
>   spi: mxic: Create a helper to configure the controller before an
>     operation
>   spi: mxic: Create a helper to ease the start of an operation
>   spi: mxic: Add support for direct mapping
>   spi: mxic: Add support for pipelined ECC operations
> 
> Pratyush Yadav (1):
>   spi: spi-mem: reject partial cycle transfers in
> 
>  drivers/mtd/nand/spi/core.c       |  51 ++++-
>  drivers/spi/Kconfig               |   2 +-
>  drivers/spi/spi-cadence-quadspi.c |  10 +-
>  drivers/spi/spi-mem.c             |  44 ++--
>  drivers/spi/spi-mxic.c            | 340 ++++++++++++++++++++++++------
>  include/linux/mtd/spinand.h       |   2 +
>  include/linux/spi/spi-mem.h       |  29 ++-
>  7 files changed, 378 insertions(+), 100 deletions(-)
>