Message-id: <55C307D2.7020501@samsung.com>
Date: Thu, 06 Aug 2015 16:08:02 +0900
From: Jaehoon Chung <jh80.chung@samsung.com>
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To: Shawn Lin <shawn.lin@rock-chips.com>, ulf.hansson@linaro.org
Cc: heiko@sntech.de, dianders@chromium.org, Vineet.Gupta1@synopsys.com,
        Wei Xu <xuwei5@hisilicon.com>, Joachim Eastwood <manabian@gmail.com>,
        Alexey Brodkin <abrodkin@synopsys.com>, Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <k.kozlowski@samsung.com>,
        Russell King <linux@arm.linux.org.uk>, Jun Nie <jun.nie@linaro.org>,
        Ralf Baechle <ralf@linux-mips.org>,
        Govindraj Raja <govindraj.raja@imgtec.com>,
        linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-mips@linux-mips.org,
        linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org,
        CPGS <cpgs@samsung.com>
Subject: Re: [RFC PATCH v4 0/9]
References: <1438843469-23807-1-git-send-email-shawn.lin@rock-chips.com>
In-reply-to: <1438843469-23807-1-git-send-email-shawn.lin@rock-chips.com>
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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...

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(-)
> 

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