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

[Ulf Hansson <ulf.hansson@linaro.org>]

On 18 April 2013 10:02, Lee Jones <lee.jones@linaro.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
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