mmc: sdhci-sprd: Add HS400 enhanced strobe mode (494c11e1) · Commits · 戴 / test

drivers/mmc/host/sdhci-sprd.c

+32 −0

Original line number	Diff line number	Diff line
		@@ -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;

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