On 20/05/19 1:11 PM, Baolin Wang wrote:
> Add HS400 enhanced strobe mode support for Spreadtrum SD host controller.
>
> Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> drivers/mmc/host/sdhci-sprd.c | 32 ++++++++++++++++++++++++++++++++
> 1 file changed, 32 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> index d91281d..edec197 100644
> --- a/drivers/mmc/host/sdhci-sprd.c
> +++ b/drivers/mmc/host/sdhci-sprd.c
> @@ -41,6 +41,7 @@
> /* SDHCI_HOST_CONTROL2 */
> #define SDHCI_SPRD_CTRL_HS200 0x0005
> #define SDHCI_SPRD_CTRL_HS400 0x0006
> +#define SDHCI_SPRD_CTRL_HS400ES 0x0007
>
> /*
> * According to the standard specification, BIT(3) of SDHCI_SOFTWARE_RESET is
> @@ -132,6 +133,15 @@ static inline void sdhci_sprd_sd_clk_off(struct sdhci_host *host)
> sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
> }
>
> +static inline void sdhci_sprd_sd_clk_on(struct sdhci_host *host)
> +{
> + u16 ctrl;
> +
> + ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
> + ctrl |= SDHCI_CLOCK_CARD_EN;
> + sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
> +}
> +
> static inline void
> sdhci_sprd_set_dll_invert(struct sdhci_host *host, u32 mask, bool en)
> {
> @@ -325,6 +335,26 @@ static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq)
> sdhci_request(mmc, mrq);
> }
>
> +static void sdhci_sprd_hs400_enhanced_strobe(struct mmc_host *mmc,
> + struct mmc_ios *ios)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> + u16 ctrl_2;
> +
> + if (!ios->enhanced_strobe)
> + return;
> +
> + sdhci_sprd_sd_clk_off(host);
> +
> + /* Set HS400 enhanced strobe mode */
> + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> + ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
> + ctrl_2 |= SDHCI_SPRD_CTRL_HS400ES;
> + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
> +
> + sdhci_sprd_sd_clk_on(host);
> +}
> +
> static const struct sdhci_pltfm_data sdhci_sprd_pdata = {
> .quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK,
> .quirks2 = SDHCI_QUIRK2_BROKEN_HS200 |
> @@ -346,6 +376,8 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
> host->dma_mask = DMA_BIT_MASK(64);
> pdev->dev.dma_mask = &host->dma_mask;
> host->mmc_host_ops.request = sdhci_sprd_request;
> + host->mmc_host_ops.hs400_enhanced_strobe =
> + sdhci_sprd_hs400_enhanced_strobe;
>
> host->mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
> MMC_CAP_ERASE | MMC_CAP_CMD23;
>
