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 <[email protected]>
Acked-by: Adrian Hunter <[email protected]> > --- > 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; >
