linux-kernel - Re: [PATCH v2 2/2] mmc: atmel: get rid of struct mci_dma

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Date:	Mon, 11 Jan 2016 15:23:49 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Mans Rullgard <mans@...sr.com>
CC:	Haavard Skinnemoen <hskinnemoen@...il.com>,
	Hans-Christian Egtvedt <egtvedt@...fundet.no>,
	Ludovic Desroches <ludovic.desroches@...el.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	<linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] mmc: atmel: get rid of struct mci_dma_data

On Sat, Jan 09, 2016 at 12:45:11PM +0000, Mans Rullgard wrote:
> As struct mci_dma_data is now only used by AVR32, it is nothing but
> pointless indirection.  Replace it with struct dw_dma_slave in the
> AVR32 platform code and with a void pointer elsewhere.
> 
> Signed-off-by: Mans Rullgard <mans@...sr.com>

Acked-by: Ludovic Desroches <ludovic.desroches@...el.com>

> ---
> Changes:
> - rebase onto v4.4-rc8: some members of struct dw_dma_slave had been
>   renamed in an unsubmitted patch
> ---
>  arch/avr32/mach-at32ap/at32ap700x.c         | 21 ++++++++++-----------
>  drivers/mmc/host/atmel-mci.c                |  1 -
>  include/linux/atmel-mci.h                   |  2 +-
>  include/linux/platform_data/mmc-atmel-mci.h | 22 ----------------------
>  4 files changed, 11 insertions(+), 35 deletions(-)
>  delete mode 100644 include/linux/platform_data/mmc-atmel-mci.h
> 
> diff --git a/arch/avr32/mach-at32ap/at32ap700x.c b/arch/avr32/mach-at32ap/at32ap700x.c
> index 6e906172dc33..bf445aa48282 100644
> --- a/arch/avr32/mach-at32ap/at32ap700x.c
> +++ b/arch/avr32/mach-at32ap/at32ap700x.c
> @@ -17,7 +17,6 @@
>  #include <linux/spi/spi.h>
>  #include <linux/usb/atmel_usba_udc.h>
>  
> -#include <linux/platform_data/mmc-atmel-mci.h>
>  #include <linux/atmel-mci.h>
>  
>  #include <asm/io.h>
> @@ -1323,13 +1322,13 @@ static struct clk atmel_mci0_pclk = {
>  
>  static bool at32_mci_dma_filter(struct dma_chan *chan, void *pdata)
>  {
> -	struct mci_dma_data *sl = pdata;
> +	struct dw_dma_slave *sl = pdata;
>  
>  	if (!sl)
>  		return false;
>  
> -	if (find_slave_dev(sl) == chan->device->dev) {
> -		chan->private = slave_data_ptr(sl);
> +	if (sl->dma_dev == chan->device->dev) {
> +		chan->private = sl;
>  		return true;
>  	}
>  
> @@ -1340,7 +1339,7 @@ struct platform_device *__init
>  at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
>  {
>  	struct platform_device		*pdev;
> -	struct mci_dma_data	        *slave;
> +	struct dw_dma_slave	        *slave;
>  	u32				pioa_mask;
>  	u32				piob_mask;
>  
> @@ -1359,15 +1358,15 @@ at32_add_device_mci(unsigned int id, struct mci_platform_data *data)
>  				ARRAY_SIZE(atmel_mci0_resource)))
>  		goto fail;
>  
> -	slave = kzalloc(sizeof(struct mci_dma_data), GFP_KERNEL);
> +	slave = kzalloc(sizeof(*slave), GFP_KERNEL);
>  	if (!slave)
>  		goto fail;
>  
> -	slave->sdata.dma_dev = &dw_dmac0_device.dev;
> -	slave->sdata.src_id = 0;
> -	slave->sdata.dst_id = 1;
> -	slave->sdata.src_master = 1;
> -	slave->sdata.dst_master = 0;
> +	slave->dma_dev = &dw_dmac0_device.dev;
> +	slave->src_id = 0;
> +	slave->dst_id = 1;
> +	slave->src_master = 1;
> +	slave->dst_master = 0;
>  
>  	data->dma_slave = slave;
>  	data->dma_filter = at32_mci_dma_filter;
> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
> index 070dffc4699e..97af84d4cdf0 100644
> --- a/drivers/mmc/host/atmel-mci.c
> +++ b/drivers/mmc/host/atmel-mci.c
> @@ -29,7 +29,6 @@
>  #include <linux/slab.h>
>  #include <linux/stat.h>
>  #include <linux/types.h>
> -#include <linux/platform_data/mmc-atmel-mci.h>
>  
>  #include <linux/mmc/host.h>
>  #include <linux/mmc/sdio.h>
> diff --git a/include/linux/atmel-mci.h b/include/linux/atmel-mci.h
> index e753062b9355..42a9e1884842 100644
> --- a/include/linux/atmel-mci.h
> +++ b/include/linux/atmel-mci.h
> @@ -37,7 +37,7 @@ struct mci_slot_pdata {
>   * @slot: Per-slot configuration data.
>   */
>  struct mci_platform_data {
> -	struct mci_dma_data	*dma_slave;
> +	void			*dma_slave;
>  	dma_filter_fn		dma_filter;
>  	struct mci_slot_pdata	slot[ATMCI_MAX_NR_SLOTS];
>  };
> diff --git a/include/linux/platform_data/mmc-atmel-mci.h b/include/linux/platform_data/mmc-atmel-mci.h
> deleted file mode 100644
> index 399a2d5a14bd..000000000000
> --- a/include/linux/platform_data/mmc-atmel-mci.h
> +++ /dev/null
> @@ -1,22 +0,0 @@
> -#ifndef __MMC_ATMEL_MCI_H
> -#define __MMC_ATMEL_MCI_H
> -
> -#include <linux/platform_data/dma-atmel.h>
> -#include <linux/platform_data/dma-dw.h>
> -
> -/**
> - * struct mci_dma_data - DMA data for MCI interface
> - */
> -struct mci_dma_data {
> -#ifdef CONFIG_ARM
> -	struct at_dma_slave     sdata;
> -#else
> -	struct dw_dma_slave     sdata;
> -#endif
> -};
> -
> -/* accessor macros */
> -#define	slave_data_ptr(s)	(&(s)->sdata)
> -#define find_slave_dev(s)	((s)->sdata.dma_dev)
> -
> -#endif /* __MMC_ATMEL_MCI_H */
> -- 
> 2.7.0
>