linux-kernel - [RFC PATCH v4 0/9]

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Date:	Thu,  6 Aug 2015 14:44:29 +0800
From:	Shawn Lin <shawn.lin@...k-chips.com>
To:	jh80.chung@...sung.com, ulf.hansson@...aro.org
Cc:	heiko@...ech.de, dianders@...omium.org, Vineet.Gupta1@...opsys.com,
	Wei Xu <xuwei5@...ilicon.com>,
	Joachim Eastwood <manabian@...il.com>,
	Alexey Brodkin <abrodkin@...opsys.com>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Jun Nie <jun.nie@...aro.org>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Govindraj Raja <govindraj.raja@...tec.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
	Shawn Lin <shawn.lin@...k-chips.com>
Subject: [RFC PATCH v4 0/9] 

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(-)

-- 
2.3.7


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