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SubjectRe: [PATCH v4 04/11] mmc: sdhci-omap: Add using external dma
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On 6/01/20 1:01 pm, Faiz Abbas wrote:
> From: Chunyan Zhang <zhang.chunyan@linaro.org>
>
> sdhci-omap can support both external dma controller via dmaengine framework
> as well as ADMA which standard SD host controller provides.
>
> Fixes by Faiz Abbas <fazi_abbas@ti.com>:
> 1. Switch to DMA slave mode when using external DMA
> 2. Add offset to mapbase
>
> Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
> Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>

Acked-by: Adrian Hunter <adrian.hunter@intel.com>

> ---
> drivers/mmc/host/Kconfig | 1 +
> drivers/mmc/host/sdhci-omap.c | 16 +++++++++++++++-
> 2 files changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index adef971582a1..2c0d90b9383e 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -1010,6 +1010,7 @@ config MMC_SDHCI_OMAP
> depends on MMC_SDHCI_PLTFM && OF
> select THERMAL
> imply TI_SOC_THERMAL
> + select MMC_SDHCI_EXTERNAL_DMA if DMA_ENGINE
> help
> This selects the Secure Digital Host Controller Interface (SDHCI)
> support present in TI's DRA7 SOCs. The controller supports
> diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
> index 083e7e053c95..84d85aa743da 100644
> --- a/drivers/mmc/host/sdhci-omap.c
> +++ b/drivers/mmc/host/sdhci-omap.c
> @@ -685,7 +685,11 @@ static int sdhci_omap_enable_dma(struct sdhci_host *host)
> struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
>
> reg = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
> - reg |= CON_DMA_MASTER;
> + reg &= ~CON_DMA_MASTER;
> + /* Switch to DMA slave mode when using external DMA */
> + if (!host->use_external_dma)
> + reg |= CON_DMA_MASTER;
> +
> sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, reg);
>
> return 0;
> @@ -1037,6 +1041,7 @@ static int sdhci_omap_probe(struct platform_device *pdev)
> const struct of_device_id *match;
> struct sdhci_omap_data *data;
> const struct soc_device_attribute *soc;
> + struct resource *regs;
>
> match = of_match_device(omap_sdhci_match, dev);
> if (!match)
> @@ -1049,6 +1054,10 @@ static int sdhci_omap_probe(struct platform_device *pdev)
> }
> offset = data->offset;
>
> + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!regs)
> + return -ENXIO;
> +
> host = sdhci_pltfm_init(pdev, &sdhci_omap_pdata,
> sizeof(*omap_host));
> if (IS_ERR(host)) {
> @@ -1065,6 +1074,7 @@ static int sdhci_omap_probe(struct platform_device *pdev)
> omap_host->timing = MMC_TIMING_LEGACY;
> omap_host->flags = data->flags;
> host->ioaddr += offset;
> + host->mapbase = regs->start + offset;
>
> mmc = host->mmc;
> sdhci_get_of_property(pdev);
> @@ -1134,6 +1144,10 @@ static int sdhci_omap_probe(struct platform_device *pdev)
> host->mmc_host_ops.execute_tuning = sdhci_omap_execute_tuning;
> host->mmc_host_ops.enable_sdio_irq = sdhci_omap_enable_sdio_irq;
>
> + /* Switch to external DMA only if there is the "dmas" property */
> + if (of_find_property(dev->of_node, "dmas", NULL))
> + sdhci_switch_external_dma(host, true);
> +
> ret = sdhci_setup_host(host);
> if (ret)
> goto err_put_sync;
>

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