RE: [EXT] [PATCH 1/2] mmc: xenon: set signal voltage and max base clock

-----Original Message----- From: Pali Rohár pali@kernel.org Sent: Wednesday, August 19, 2020 17:20 To: Peng Fan peng.fan@nxp.com; Kostya Porotchkin kostap@marvell.com; Stefan Roese sr@denx.de Cc: u-boot@lists.denx.de Subject: [EXT] [PATCH 1/2] mmc: xenon: set signal voltage and max base clock

External Email

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From: Evan Wang xswang@marvell.com

• The SDIO signal voltage and max base clock frequency setting are missing in driver, which causes SDIO not working.
• The patch adds SDIO signal voltage switch support, which is based on regulator-gpio of vqmmc-supply, and sets the max base clock frequency.
• Fix the zero clock value in call to sdhci_setup_cfg() function.

Change-Id: I79c8860c65b8db166f4f70db56ede4097f71f1fa Signed-off-by: Evan Wang xswang@marvell.com Reviewed-on: http://vgitil04.il.marvell.com:8080/53589 Reviewed-by: Hua Jing jinghua@marvell.com Tested-by: Hua Jing jinghua@marvell.com [pali: Amended fixup patch] Signed-off-by: Pali Rohár pali@kernel.org

Reviewed-by: Konstantin Porotchkin kostap@marvell.com

---

drivers/mmc/xenon_sdhci.c | 79 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 78 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/xenon_sdhci.c b/drivers/mmc/xenon_sdhci.c index 356dd9846d..7f9a579c83 100644 --- a/drivers/mmc/xenon_sdhci.c +++ b/drivers/mmc/xenon_sdhci.c @@ -22,6 +22,7 @@ #include <linux/libfdt.h> #include <malloc.h> #include <sdhci.h> +#include <power/regulator.h>

DECLARE_GLOBAL_DATA_PTR;

@@ -42,6 +43,14 @@ DECLARE_GLOBAL_DATA_PTR; #define SDHC_SYS_EXT_OP_CTRL 0x010C #define MASK_CMD_CONFLICT_ERROR BIT(8)

+#define SDHC_SLOT_EMMC_CTRL 0x0130 +#define ENABLE_DATA_STROBE_SHIFT 24 +#define SET_EMMC_RSTN_SHIFT 16 +#define EMMC_VCCQ_MASK 0x3 +#define EMMC_VCCQ_1_8V 0x1 +#define EMMC_VCCQ_1_2V 0x2 +#define EMMC_VCCQ_3_3V 0x3

#define SDHC_SLOT_RETUNING_REQ_CTRL 0x0144 /* retuning compatible */ #define RETUNING_COMPATIBLE 0x1 @@ -108,6 +117,8 @@ DECLARE_GLOBAL_DATA_PTR; #define MMC_TIMING_MMC_HS400 10

#define XENON_MMC_MAX_CLK 400000000 +#define XENON_MMC_3V3_UV 3300000 +#define XENON_MMC_1V8_UV 1800000

enum soc_pad_ctrl_type { SOC_PAD_SD, @@ -128,6 +139,8 @@ struct xenon_sdhci_priv {

void *pad_ctrl_reg; int pad_type;

• struct udevice *vqmmc;

};

static int xenon_mmc_phy_init(struct sdhci_host *host) @@ -208,6 +221,51 @@ static void armada_3700_soc_pad_voltage_set(struct sdhci_host *host) writel(ARMADA_3700_SOC_PAD_3_3V, priv->pad_ctrl_reg); }

+static int xenon_mmc_start_signal_voltage_switch(struct sdhci_host +*host) {

• struct xenon_sdhci_priv *priv = host->mmc->priv;
• u8 voltage;
• u32 ctrl;
• int ret = 0;
• /* If there is no vqmmc regulator, return */
• if (!priv->vqmmc)

• return 0;
  

• if (priv->pad_type == SOC_PAD_FIXED_1_8V) {

• /* Switch to 1.8v */
  

• ret = regulator_set_value(priv->vqmmc,
  

• 			  XENON_MMC_1V8_UV);
  

• } else if (priv->pad_type == SOC_PAD_SD) {

• /* Get voltage info */
  

• voltage = sdhci_readb(host, SDHCI_POWER_CONTROL);
  

• voltage &= ~SDHCI_POWER_ON;
  

• if (voltage == SDHCI_POWER_330) {
  

• 	/* Switch to 3.3v */
  

• 	ret = regulator_set_value(priv->vqmmc,
  

• 				  XENON_MMC_3V3_UV);
  

• } else {
  

• 	/* Switch to 1.8v */
  

• 	ret = regulator_set_value(priv->vqmmc,
  

• 				  XENON_MMC_1V8_UV);
  

• }
  

• }
• /* Set VCCQ, eMMC mode: 1.8V; SD/SDIO mode: 3.3V */
• ctrl = sdhci_readl(host, SDHC_SLOT_EMMC_CTRL);
• if (IS_SD(host->mmc))

• ctrl |= EMMC_VCCQ_3_3V;
  

• else

• ctrl |= EMMC_VCCQ_1_8V;
  

• sdhci_writel(host, ctrl, SDHC_SLOT_EMMC_CTRL);
• if (ret)

• printf("Signal voltage switch fail\n");
  

• return ret;

+}

static void xenon_mmc_phy_set(struct sdhci_host *host) { struct xenon_sdhci_priv *priv = host->mmc->priv; @@ -334,6 +392,13 @@ static int xenon_sdhci_set_ios_post(struct sdhci_host *host) uint speed = host->mmc->tran_speed; int pwr_18v = 0;

• /*

• * Signal Voltage Switching is only applicable for Host Controllers
  

• * v3.00 and above.
  

• */
  

• if (SDHCI_GET_VERSION(host) >= SDHCI_SPEC_300)

• xenon_mmc_start_signal_voltage_switch(host);
  

• if ((sdhci_readb(host, SDHCI_POWER_CONTROL) &

~SDHCI_POWER_ON) == SDHCI_POWER_180) pwr_18v = 1; @@ -394,6 +459,18 @@ static int xenon_sdhci_probe(struct udevice *dev) /* Set default timing */ priv->timing = MMC_TIMING_LEGACY;

• /* Get the vqmmc regulator if there is */
• device_get_supply_regulator(dev, "vqmmc-supply", &priv-

...

vqmmc);

• /* Set the initial voltage value to 3.3V if there is regulator */
• if (priv->vqmmc) {

• ret = regulator_set_value(priv->vqmmc,
  

• 			  XENON_MMC_3V3_UV);
  

• if (ret) {
  

• 	printf("Failed to set VQMMC regulator to 3.3V\n");
  

• 	return ret;
  

• }
  

• }
• /* Disable auto clock gating during init */ xenon_mmc_set_acg(host, false);

@@ -426,7 +503,7 @@ static int xenon_sdhci_probe(struct udevice *dev) host->ops = &xenon_sdhci_ops;

host->max_clk = XENON_MMC_MAX_CLK;

• ret = sdhci_setup_cfg(&plat->cfg, host, 0, 0);

• ret = sdhci_setup_cfg(&plat->cfg, host, XENON_MMC_MAX_CLK, 0); if (ret) return ret;

-- 2.20.1