From: Jonathan Bell <jonathan@raspberrypi.com>
Date: Fri, 9 Feb 2024 13:47:23 +0000 (+0000)
Subject: drivers: mmc: sdhci-brcmstb: fix usage of SD_PIN_SEL on BCM2712
X-Git-Tag: accepted/tizen/unified/20240422.153132~89
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fcd86d46c949c15822b73b277df35ebfb61d08b3;p=platform%2Fkernel%2Flinux-rpi.git

drivers: mmc: sdhci-brcmstb: fix usage of SD_PIN_SEL on BCM2712

The SDIO_CFG register SD_PIN_SEL conflates two settings - whether eMMC
HS or SD UHS timings are applied to the interface, and whether or not
the card-detect line is functional. SD_PIN_SEL can only be changed when
the SD clock isn't running, so add a bcm2712-specific clock setup.

Toggling SD_PIN_SEL at runtime means the integrated card-detect feature
can't be used, so this controller needs a cd-gpios property.

Also fix conditionals for usage of the delay-line PHY - no-1-8-v will
imply no bits set in hsemmc_mask or uhs_mask, so remove it.

Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
---

diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
index aae8c91..f619c5e 100644
--- a/drivers/mmc/host/sdhci-brcmstb.c
+++ b/drivers/mmc/host/sdhci-brcmstb.c
@@ -38,7 +38,8 @@
 
 #define SDIO_CFG_SD_PIN_SEL			0x44
 #define  SDIO_CFG_SD_PIN_SEL_MASK		0x3
-#define  SDIO_CFG_SD_PIN_SEL_CARD		BIT(1)
+#define  SDIO_CFG_SD_PIN_SEL_SD			BIT(1)
+#define  SDIO_CFG_SD_PIN_SEL_MMC		BIT(0)
 
 #define SDIO_CFG_MAX_50MHZ_MODE			0x1ac
 #define  SDIO_CFG_MAX_50MHZ_MODE_STRAP_OVERRIDE	BIT(31)
@@ -102,6 +103,42 @@ static void sdhci_brcmstb_hs400es(struct mmc_host *mmc, struct mmc_ios *ios)
 	writel(reg, host->ioaddr + SDHCI_VENDOR);
 }
 
+static void sdhci_bcm2712_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+	u16 clk;
+	u32 reg;
+	bool is_emmc_rate = false;
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_brcmstb_priv *brcmstb_priv = sdhci_pltfm_priv(pltfm_host);
+
+	host->mmc->actual_clock = 0;
+
+	sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
+
+	switch (host->mmc->ios.timing) {
+	case MMC_TIMING_MMC_HS400:
+	case MMC_TIMING_MMC_HS200:
+	case MMC_TIMING_MMC_DDR52:
+	case MMC_TIMING_MMC_HS:
+	is_emmc_rate = true;
+	break;
+	}
+
+	reg = readl(brcmstb_priv->cfg_regs + SDIO_CFG_SD_PIN_SEL);
+	reg &= ~SDIO_CFG_SD_PIN_SEL_MASK;
+	if (is_emmc_rate)
+		reg |= SDIO_CFG_SD_PIN_SEL_MMC;
+	else
+		reg |= SDIO_CFG_SD_PIN_SEL_SD;
+	writel(reg, brcmstb_priv->cfg_regs + SDIO_CFG_SD_PIN_SEL);
+
+	if (clock == 0)
+		return;
+
+	clk = sdhci_calc_clk(host, clock, &host->mmc->actual_clock);
+	sdhci_enable_clk(host, clk);
+}
+
 static void sdhci_brcmstb_set_clock(struct sdhci_host *host, unsigned int clock)
 {
 	u16 clk;
@@ -161,22 +198,16 @@ static void sdhci_brcmstb_cfginit_2712(struct sdhci_host *host)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_brcmstb_priv *brcmstb_priv = sdhci_pltfm_priv(pltfm_host);
-	bool want_dll = false;
 	u32 uhs_mask = (MMC_CAP_UHS_SDR50 | MMC_CAP_UHS_SDR104);
 	u32 hsemmc_mask = (MMC_CAP2_HS200_1_8V_SDR | MMC_CAP2_HS200_1_2V_SDR |
 			   MMC_CAP2_HS400_1_8V | MMC_CAP2_HS400_1_2V);
 	u32 reg;
 
-	if (!(host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)) {
-	    if((host->mmc->caps & uhs_mask) || (host->mmc->caps2 & hsemmc_mask))
-		want_dll = true;
-	}
-
 	/*
-	 * If we want a speed that requires tuning,
-	 * then select the delay line PHY as the clock source.
-	 */
-	if (want_dll) {
+	* If we support a speed that requires tuning,
+	* then select the delay line PHY as the clock source.
+	*/
+	if ((host->mmc->caps & uhs_mask) || (host->mmc->caps2 & hsemmc_mask)) {
 		reg = readl(brcmstb_priv->cfg_regs + SDIO_CFG_MAX_50MHZ_MODE);
 		reg &= ~SDIO_CFG_MAX_50MHZ_MODE_ENABLE;
 		reg |= SDIO_CFG_MAX_50MHZ_MODE_STRAP_OVERRIDE;
@@ -190,12 +221,6 @@ static void sdhci_brcmstb_cfginit_2712(struct sdhci_host *host)
 		reg &= ~SDIO_CFG_CTRL_SDCD_N_TEST_LEV;
 		reg |= SDIO_CFG_CTRL_SDCD_N_TEST_EN;
 		writel(reg, brcmstb_priv->cfg_regs + SDIO_CFG_CTRL);
-	} else {
-		/* Enable card detection line */
-		reg = readl(brcmstb_priv->cfg_regs + SDIO_CFG_SD_PIN_SEL);
-		reg &= ~SDIO_CFG_SD_PIN_SEL_MASK;
-		reg |= SDIO_CFG_SD_PIN_SEL_CARD;
-		writel(reg, brcmstb_priv->cfg_regs + SDIO_CFG_SD_PIN_SEL);
 	}
 }
 
@@ -330,7 +355,7 @@ static struct sdhci_ops sdhci_brcmstb_ops = {
 };
 
 static struct sdhci_ops sdhci_brcmstb_ops_2712 = {
-	.set_clock = sdhci_set_clock,
+	.set_clock = sdhci_bcm2712_set_clock,
 	.set_power = sdhci_brcmstb_set_power,
 	.set_bus_width = sdhci_set_bus_width,
 	.reset = sdhci_reset,