Subject: [RFC PATCH v8 0/10] Add external dma support for Synopsys MSHC

From: [email-masked] (Jaehoon Chung)
Date: Thu, 01 Oct 2015 18:14:51 +0900

Dear, All.

I will apply patch 01-03 at my repository on today.
But i don't know better how i do about other patches relevant to config file.

Best Regards,
Jaehoon Chung

On 09/16/2015 03:40 PM, Shawn Lin wrote:
> 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
> 
> Test emmc throughput on my platform with edmac support and without edmac support(pio only)
> iozone -L64 -S32 -azecwI -+n -r4k -r64k -r128k -s1g -i0 -i1 -i2 -f datafile -Rb out.xls > /mnt/result.txt
> (light cpu loading, Direct IO, fixed line size, all pattern recycle, 1GB data in total)
>  ___________________________________________________________
> |                   external dma mode                       |
> |-----------------------------------------------------------|
> |blksz | Random Read | Random Write | Seq Read   | Seq Write|
> |-----------------------------------------------------------|
> |4kB   |  13953kB/s  |    8602kB/s  | 13672kB/s  |  9785kB/s|
> |-----------------------------------------------------------|
> |64kB  |  46058kB/s  |   24794kB/s  | 48058kB/s  | 25418kB/s|
> |-----------------------------------------------------------|
> |128kB |  57026kB/s  |   35117kB/s  | 57375kB/s  | 35183kB/s|
> |-----------------------------------------------------------|
>                            VS
>  ___________________________________________________________
> |                          pio mode                         |
> |-----------------------------------------------------------|
> |blksz | Random Read  | Random Write | Seq Read  | Seq Write|
> |-----------------------------------------------------------|
> |4kB   |  11720kB/s   |    8644kB/s  | 11549kB/s |  9624kB/s|
> |-----------------------------------------------------------|
> |64kB  |  21869kB/s   |   24414kB/s  | 22031kB/s | 27986kB/s|
> |-----------------------------------------------------------|
> |128kB |  23718kB/s   |   34495kB/s  | 24698kB/s | 34637kB/s|
> |-----------------------------------------------------------|
> 
> 
> Changes in v8:
> - remove trans_mode variable
> - remove unnecessary dma_ops check
> - remove unnecessary comment
> - fix coding style based on latest ulf's next
> - add Acked-by: Jaehoon Chung <[email-masked]>
>   for HCON's changes
> 
> Changes in v7:
> - rebased on Ulf's next
> - combine condition state
> - elaborate more about DMA_INTERFACE
> - define some macro for DMA_INERFACE value
> - spilt HCON ops' changes into another patch
> 
> Changes in v6:
> - add trans_mode condition for IDMAC initialization
>   suggested by Heiko
> - re-test my patch on rk3188 platform and update commit msg
> - update performance of pio vs edmac in cover letter
> 
> Changes in v5:
> - add the title of cover letter
> - fix typo of comment
> - add macro for reading HCON register
> - add "Acked-by: Krzysztof Kozlowski <[email-masked]>" for exynos_defconfig patch
> - add "Acked-by: Vineet Gupta <[email-masked]>" for axs10x_defconfig patch
> - add "Acked-by: Govindraj Raja <[email-masked]>" and
>   "Acked-by: Ralf Baechle <[email-masked]>" for pistachio_defconfig patch
> - add "Acked-by: Joachim Eastwood <[email-masked]>" for lpc18xx_defconfig patch
> - add "Acked-by: Wei Xu <[email-masked]>" for hisi_defconfig patch
> - rebase on "https://github.com/jh80chung/dw-mmc.git tags/dw-mmc-for-ulf-v4.2" for merging easily
> 
> 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 (10):
>   mmc: dw_mmc: Add external dma interface support
>   mmc: dw_mmc: use macro for HCON register operations
>   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                          | 272 +++++++++++++++++----
>  drivers/mmc/host/dw_mmc.h                          |   9 +
>  include/linux/mmc/dw_mmc.h                         |  23 +-
>  15 files changed, 276 insertions(+), 75 deletions(-)
>