linux-kernel - Re: [PATCH] mmc: mmci: Allow MMCI to request channels with information acquired from DT

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Message-ID: <CAPDyKFqHBYRRNFqKMdw4H73_o-v_sQ5ybGg3jZHqgNDg4zyB5w@mail.gmail.com>
Date:	Thu, 18 Apr 2013 10:21:14 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linus.walleij@...ricsson.com,
	Russell King <linux@....linux.org.uk>,
	Chris Ball <cjb@...top.org>, linux-mmc@...r.kernel.org
Subject: Re: [PATCH] mmc: mmci: Allow MMCI to request channels with
 information acquired from DT

On 18 April 2013 10:02, Lee Jones <lee.jones@...aro.org> wrote:
>> I think you can further simplify this, given that in the DT case we always
>> allocate a zeroed mmci_platform_data for host->plat, so !plat cannot happen
>> when we get here.
>
> Okay, third time lucky. :)
>
> diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
> index 372e921..3260ab4 100644
> --- a/drivers/mmc/host/mmci.c
> +++ b/drivers/mmc/host/mmci.c
> @@ -298,14 +298,16 @@ static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
>   * no custom DMA interfaces are supported.
>   */
>  #ifdef CONFIG_DMA_ENGINE
> -static void mmci_dma_setup(struct mmci_host *host)
> +static void mmci_dma_setup(struct amba_device *dev,
> +                          struct mmci_host *host)

Hi Lee,

You don't need to pass the amba_device, this can be fetched from the
mmci_host. Check how other functions converts the mmci host it in this
driver.

Kind regards
Ulf Hansson

>  {
> +       struct device_node *np = dev->dev.of_node;
>         struct mmci_platform_data *plat = host->plat;
>         const char *rxname, *txname;
>         dma_cap_mask_t mask;
>
> -       if (!plat || !plat->dma_filter) {
> -               dev_info(mmc_dev(host->mmc), "no DMA platform data\n");
> +       if (!(plat->dma_filter || np)) {
> +               dev_info(mmc_dev(host->mmc), "no DMA platform data or DT\n");
>                 return;
>         }
>
> @@ -321,19 +323,21 @@ static void mmci_dma_setup(struct mmci_host *host)
>          * attempt to use it bidirectionally, however if it is
>          * is specified but cannot be located, DMA will be disabled.
>          */
> -       if (plat->dma_rx_param) {
> -               host->dma_rx_channel = dma_request_channel(mask,
> -                                                          plat->dma_filter,
> -                                                          plat->dma_rx_param);
> +       if (plat->dma_rx_param || np) {
> +               host->dma_rx_channel = dma_request_slave_channel_compat(mask,
> +                                                               plat->dma_filter,
> +                                                               plat->dma_rx_param,
> +                                                               &dev->dev, "rx");
>                 /* E.g if no DMA hardware is present */
>                 if (!host->dma_rx_channel)
>                         dev_err(mmc_dev(host->mmc), "no RX DMA channel\n");
>         }
>
> -       if (plat->dma_tx_param) {
> -               host->dma_tx_channel = dma_request_channel(mask,
> -                                                          plat->dma_filter,
> -                                                          plat->dma_tx_param);
> +       if (plat->dma_tx_param || np) {
> +               host->dma_tx_channel = dma_request_slave_channel_compat(mask,
> +                                                               plat->dma_filter,
> +                                                               plat->dma_tx_param,
> +                                                               &dev->dev, "tx");
>                 if (!host->dma_tx_channel)
>                         dev_warn(mmc_dev(host->mmc), "no TX DMA channel\n");
>         } else {
> @@ -1538,7 +1542,7 @@ static int mmci_probe(struct amba_device *dev,
>                  amba_rev(dev), (unsigned long long)dev->res.start,
>                  dev->irq[0], dev->irq[1]);
>
> -       mmci_dma_setup(host);
> +       mmci_dma_setup(dev, host);
>
>         pm_runtime_set_autosuspend_delay(&dev->dev, 50);
>         pm_runtime_use_autosuspend(&dev->dev);
>
> --
> Lee Jones
> Linaro ST-Ericsson Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
> --
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