Re: [PATCH 3/3] mci: at91: convert to dma_request_slave_channel_compat()

[Nicolas Ferre <nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>]

On 04/15/2013 02:16 PM, ludovic.desroches-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org :
> From: Ludovic Desroches <ludovic.desroches-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>
> 
> Use generic DMA DT helper. Platforms booting with or without DT populated are
> both supported.
> 
> Signed-off-by: Ludovic Desroches <ludovic.desroches-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>

Acked-by: Nicolas Ferre <nicolas.ferre-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>

> ---
>  drivers/mmc/host/atmel-mci.c | 25 ++++++++++++-------------
>  1 file changed, 12 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
> index 10f8b73..73d5d24 100644
> --- a/drivers/mmc/host/atmel-mci.c
> +++ b/drivers/mmc/host/atmel-mci.c
> @@ -2224,10 +2224,15 @@ static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
>  	mmc_free_host(slot->mmc);
>  }
>  
> -static bool atmci_filter(struct dma_chan *chan, void *slave)
> +static bool atmci_filter(struct dma_chan *chan, void *pdata)
>  {
> -	struct mci_dma_data	*sl = slave;
> +	struct mci_platform_data *sl_pdata = pdata;
> +	struct mci_dma_data *sl;
>  
> +	if (!sl_pdata)
> +		return false;
> +
> +	sl = sl_pdata->dma_slave;
>  	if (sl && find_slave_dev(sl) == chan->device->dev) {
>  		chan->private = slave_data_ptr(sl);
>  		return true;
> @@ -2239,24 +2244,18 @@ static bool atmci_filter(struct dma_chan *chan, void *slave)
>  static bool atmci_configure_dma(struct atmel_mci *host)
>  {
>  	struct mci_platform_data	*pdata;
> +	dma_cap_mask_t mask;
>  
>  	if (host == NULL)
>  		return false;
>  
>  	pdata = host->pdev->dev.platform_data;
>  
> -	if (!pdata)
> -		return false;
> +	dma_cap_zero(mask);
> +	dma_cap_set(DMA_SLAVE, mask);
>  
> -	if (pdata->dma_slave && find_slave_dev(pdata->dma_slave)) {
> -		dma_cap_mask_t mask;
> -
> -		/* Try to grab a DMA channel */
> -		dma_cap_zero(mask);
> -		dma_cap_set(DMA_SLAVE, mask);
> -		host->dma.chan =
> -			dma_request_channel(mask, atmci_filter, pdata->dma_slave);
> -	}
> +	host->dma.chan = dma_request_slave_channel_compat(mask, atmci_filter, pdata,
> +						   	  &host->pdev->dev, "rxtx");
>  	if (!host->dma.chan) {
>  		dev_warn(&host->pdev->dev, "no DMA channel available\n");
>  		return false;
> 


-- 
Nicolas Ferre