Re: [RFC PATCH v4 0/9]

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在 2015/8/6 15:08, Jaehoon Chung 写道:
Hi, Shawn.

I remembered that Krzysztof has mentioned "Fix the title of cover letter."
Your cover letter's title is nothing.. "[RFC PATCH v4 0/9] " ??
[RFC PATCH v4 0/9] your title...
 Sorry, I forgot it, and will fix in next version...

Best Regards,
Jaehoon Chung

On 08/06/2015 03:44 PM, Shawn Lin wrote:
Add external dma support for Synopsys MSHC

Synopsys DesignWare mobile storage host controller supports three
types of transfer mode: pio, internal dma and external dma. However,
dw_mmc can only supports pio and internal dma now. Thus some platforms
using dw-mshc integrated with generic dma can't work in dma mode. So we
submit this patch to achieve it.

And the config option, CONFIG_MMC_DW_IDMAC, was added by Will Newton
(commit:f95f3850) for the first version of dw_mmc and never be touched since
then. At that time dt-bindings hadn't been introduced into dw_mmc yet means
we should select CONFIG_MMC_DW_IDMAC to enable internal dma mode at compile
time. Nowadays, device-tree helps us to support a variety of boards with one
kernel. That's why we need to remove it and decide the transfer mode by reading
dw_mmc's HCON reg at runtime.

This RFC patch needs lots of ACKs. I know it's hard, but it does need someone
to make the running.

Patch does the following things:
- remove CONFIG_MMC_DW_IDMAC config option
- add bindings for edmac used by synopsys-dw-mshc
   at runtime
- add edmac support for synopsys-dw-mshc

Patch is based on next of git://git.linaro.org/people/ulf.hansson/mmc


Changes in v4:
- remove "host->trans_mode" and use "host->use_dma" to indicate
   transfer mode.
- remove all bt-bindings' changes since we don't need new properities.
- check transfer mode at runtime by reading HCON reg
- spilt defconfig changes for each sub-architecture
- fix the title of cover letter
- reuse some code for reducing code size

Changes in v3:
- choose transfer mode at runtime
- remove all CONFIG_MMC_DW_IDMAC config option
- add supports-idmac property for some platforms

Changes in v2:
- Fix typo of dev_info msg
- remove unused dmach from declaration of dw_mci_dma_slave

Shawn Lin (9):
   mmc: dw_mmc: Add external dma interface support
   Documentation: synopsys-dw-mshc: add bindings for idmac and edmac
   mips: pistachio_defconfig: remove CONFIG_MMC_DW_IDMAC
   arc: axs10x_defconfig: remove CONFIG_MMC_DW_IDMAC
   arm: exynos_defconfig: remove CONFIG_MMC_DW_IDMAC
   arm: hisi_defconfig: remove CONFIG_MMC_DW_IDMAC
   arm: lpc18xx_defconfig: remove CONFIG_MMC_DW_IDMAC
   arm: multi_v7_defconfig: remove CONFIG_MMC_DW_IDMAC
   arm: zx_defconfig: remove CONFIG_MMC_DW_IDMAC

  .../devicetree/bindings/mmc/synopsys-dw-mshc.txt   |  25 ++
  arch/arc/configs/axs101_defconfig                  |   1 -
  arch/arc/configs/axs103_defconfig                  |   1 -
  arch/arc/configs/axs103_smp_defconfig              |   1 -
  arch/arm/configs/exynos_defconfig                  |   1 -
  arch/arm/configs/hisi_defconfig                    |   1 -
  arch/arm/configs/lpc18xx_defconfig                 |   1 -
  arch/arm/configs/multi_v7_defconfig                |   1 -
  arch/arm/configs/zx_defconfig                      |   1 -
  arch/mips/configs/pistachio_defconfig              |   1 -
  drivers/mmc/host/Kconfig                           |  11 +-
  drivers/mmc/host/dw_mmc-pltfm.c                    |   2 +
  drivers/mmc/host/dw_mmc.c                          | 258 +++++++++++++++++----
  include/linux/mmc/dw_mmc.h                         |  27 ++-
  14 files changed, 257 insertions(+), 75 deletions(-)






--
Shawn Lin


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