Re: [PATCH v1 8/9] mmc: sdhci-cadence: add Cadence SD6HC support

[Adrian Hunter]

On 11/05/2026 23:21, Tanmay Kathpalia wrote:
> The Cadence SD6HC is the sixth-generation SD Host Controller used in
> Agilex5 SoCs. Its PHY differs substantially from the SD4HC: it
> requires per-speed-mode IO cell timing parameters and a DLL-based
> delay line to achieve correct signal margins across all speed grades
> from Default Speed to HS400.
> 
> Support is implemented in a new sdhci-cadence6.c alongside the
> existing v4 code, now in sdhci-cadence4.c. Shared structures and the
> v6 function interface are declared in a new sdhci-cadence.h header.
> The common driver paths select between v4 and v6 PHY operations based
> on the SDHCI specification version reported by the controller.
> 
> The new compatible string "cdns,sd6hc" identifies SD6HC hardware in
> device tree.
> 
> Signed-off-by: Tanmay Kathpalia <tanmay.kathpalia@xxxxxxxxxx>
> ---
>  MAINTAINERS                                   |    7 +
>  drivers/mmc/host/Makefile                     |    3 +-
>  drivers/mmc/host/sdhci-cadence.h              |  113 ++
>  .../{sdhci-cadence.c => sdhci-cadence4.c}     |   92 +-
>  drivers/mmc/host/sdhci-cadence6.c             | 1051 +++++++++++++++++
>  5 files changed, 1228 insertions(+), 38 deletions(-)
>  create mode 100644 drivers/mmc/host/sdhci-cadence.h
>  rename drivers/mmc/host/{sdhci-cadence.c => sdhci-cadence4.c} (91%)
>  create mode 100644 drivers/mmc/host/sdhci-cadence6.c

The new file names seem slightly misleading since sdhci-cadence4.c
is the main driver as well as supporting V4, whereas sdhci-cadence6.c
is most of V6 support.

There doesn't seem much to gain from having a separate sdhci-cadence6.c.
Isn't it simpler to just put it all in 1 source file.

> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 27fefd92744c..4856450bfd36 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -23863,6 +23863,13 @@ L:	linux-mmc@xxxxxxxxxxxxxxx
>  S:	Maintained
>  F:	drivers/mmc/host/sdhci-brcmstb*
>  
> +SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI) CADENCE DRIVER
> +M:	Tanmay Kathpalia <tanmay.kathpalia@xxxxxxxxxx>
> +L:	linux-mmc@xxxxxxxxxxxxxxx
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/mmc/cdns,sdhci.yaml
> +F:	drivers/mmc/host/sdhci-cadence*
> +
>  SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI) DRIVER
>  M:	Adrian Hunter <adrian.hunter@xxxxxxxxx>
>  L:	linux-mmc@xxxxxxxxxxxxxxx
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index ee412e6b84d6..f3b2f43e751e 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -80,7 +80,8 @@ obj-$(CONFIG_MMC_REALTEK_USB)	+= rtsx_usb_sdmmc.o
>  
>  obj-$(CONFIG_MMC_SDHCI_PLTFM)		+= sdhci-pltfm.o
>  obj-$(CONFIG_MMC_SDHCI_CADENCE)		+= sdhci-cadence.o
> -obj-$(CONFIG_MMC_SDHCI_ESDHC_MCF)       += sdhci-esdhc-mcf.o
> +sdhci-cadence-y				+= sdhci-cadence4.o sdhci-cadence6.o
> +obj-$(CONFIG_MMC_SDHCI_ESDHC_MCF)	+= sdhci-esdhc-mcf.o
>  obj-$(CONFIG_MMC_SDHCI_ESDHC_IMX)	+= sdhci-esdhc-imx.o
>  obj-$(CONFIG_MMC_SDHCI_DOVE)		+= sdhci-dove.o
>  obj-$(CONFIG_MMC_SDHCI_TEGRA)		+= sdhci-tegra.o
> diff --git a/drivers/mmc/host/sdhci-cadence.h b/drivers/mmc/host/sdhci-cadence.h
> new file mode 100644
> index 000000000000..05b8d8f16543
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-cadence.h
> @@ -0,0 +1,113 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) 2026 Altera Corporation
> + *   Author: Tanmay Kathpalia <tanmay.kathpalia@xxxxxxxxxx>
> + *
> + * Cadence SD/SDIO/eMMC Host Controller driver - common header
> + * Shared definitions and structures for the Cadence SDHCI driver.
> + * Contains private data and declarations for SD6HC-specific functions
> + * called by the main driver in sdhci-cadence4.c.
> + */
> +
> +#ifndef _MMC_HOST_SDHCI_CADENCE_H
> +#define _MMC_HOST_SDHCI_CADENCE_H
> +
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +#include <linux/clk.h>
> +#include <linux/iopoll.h>
> +#include <linux/mmc/host.h>
> +
> +#include "sdhci-pltfm.h"
> +
> +/* HRS - Host Register Set (specific to Cadence) */
> +#define SDHCI_CDNS_HRS04		0x10		/* PHY access: address port */
> +#define SDHCI_CDNS_HRS05		0x14		/* PHY access: data port */
> +
> +/*
> + * The tuned val register is 6 bit-wide, but not the whole of the range is
> + * available.  The range 0-42 seems to be available (then 43 wraps around to 0)
> + * but I am not quite sure if it is official.  Use only 0 to 39 for safety.
> + */
> +#define SDHCI_CDNS_MAX_TUNING_LOOP	40
> +
> +/**
> + * struct sdhci_cdns_priv - Cadence SDHCI private controller data
> + * @hrs_addr: Base address of Cadence Host Register Set (HRS) registers.
> + * @ctl_addr: Base address for write control registers.
> + *            Used only for "amd,pensando-elba-sd4hc" compatible controllers
> + *            to enable byte-lane writes.
> + * @wrlock: Spinlock for protecting register writes (Elba only).
> + * @enhanced_strobe: Flag indicating if Enhanced Strobe (HS400ES) is enabled.
> + * @priv_writel: Optional SoC-specific write function for register access.
> + *               Used for Elba to ensure correct byte-lane enable.
> + * @rst_hw: Hardware reset control for the controller.
> + * @phy: Opaque pointer to variant-specific PHY data.
> + *       For SD4HC: points to struct sdhci_cdns4_phy.
> + *       For SD6HC: points to struct sdhci_cdns6_phy.
> + */
> +struct sdhci_cdns_priv {
> +	void __iomem *hrs_addr;
> +	void __iomem *ctl_addr; /* write control */
> +	spinlock_t wrlock; /* write lock */
> +	bool enhanced_strobe;
> +	void (*priv_writel)(struct sdhci_cdns_priv *priv, u32 val,
> +			    void __iomem *reg);
> +	struct reset_control *rst_hw;
> +	void *phy;
> +};
> +
> +/*
> + * sdhci_cdns_get_priv - Helper to retrieve Cadence private data from sdhci_host
> + * @host: Pointer to struct sdhci_host.
> + *
> + * Return: Pointer to struct sdhci_cdns_priv.
> + */
> +static inline void *sdhci_cdns_get_priv(struct sdhci_host *host)
> +{
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +
> +	return sdhci_pltfm_priv(pltfm_host);
> +}
> +
> +/**
> + * sdhci_cdns6_set_uhs_signaling - Program PHY registers for a specific timing mode.
> + * @host: Pointer to struct sdhci_host.
> + * @timing: MMC timing mode (MMC_TIMING_*).
> + */
> +void sdhci_cdns6_set_uhs_signaling(struct sdhci_host *host, unsigned int timing);
> +
> +/**
> + * sdhci_cdns6_set_tune_val - Set the PHY tuning value.
> + * @host: Pointer to struct sdhci_host.
> + * @val: Tuning value to program.
> + *
> + * Return: 0 on success, -ETIMEDOUT if PHY initialization times out.
> + */
> +int sdhci_cdns6_set_tune_val(struct sdhci_host *host, unsigned int val);
> +
> +/**
> + * sdhci_cdns6_phy_probe - Probe and initialize Cadence SD6HC PHY parameters
> + * @pdev: Platform device pointer
> + * @priv: Pointer to Cadence private data structure
> + *
> + * Return: 0 on success or a negative error code.
> + */
> +int sdhci_cdns6_phy_probe(struct platform_device *pdev,
> +			  struct sdhci_cdns_priv *priv);
> +/**
> + * sdhci_cdns6_hw_reset - Perform hardware reset of the Cadence SDHCI controller.
> + * @host: Pointer to struct sdhci_host.
> + */
> +void sdhci_cdns6_hw_reset(struct sdhci_host *host);
> +
> +/**
> + * sdhci_cdns6_phy_init - Initialize the SD6HC PHY with current settings.
> + * @priv: Pointer to Cadence private data structure.
> + *
> + * Return: 0 on success, -ETIMEDOUT if PHY initialization times out.
> + */
> +int sdhci_cdns6_phy_init(struct sdhci_cdns_priv *priv);
> +
> +#endif /* _MMC_HOST_SDHCI_CADENCE_H */
> diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence4.c
> similarity index 91%
> rename from drivers/mmc/host/sdhci-cadence.c
> rename to drivers/mmc/host/sdhci-cadence4.c
> index fe3f7c5109fc..283d22328248 100644
> --- a/drivers/mmc/host/sdhci-cadence.c
> +++ b/drivers/mmc/host/sdhci-cadence4.c
> @@ -2,22 +2,17 @@
>  /*
>   * Copyright (C) 2016 Socionext Inc.
>   *   Author: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
> + * Copyright (C) 2026 Altera Corporation
>   */
>  
>  #include <linux/bitfield.h>
>  #include <linux/bits.h>
> -#include <linux/iopoll.h>
>  #include <linux/module.h>
> -#include <linux/mmc/host.h>
> -#include <linux/mmc/mmc.h>
> -#include <linux/of.h>
> -#include <linux/platform_device.h>
> -#include <linux/reset.h>
>  
> -#include "sdhci-pltfm.h"
> +#include "sdhci-cadence.h"
>  
>  /* HRS - Host Register Set (specific to Cadence) */
> -#define SDHCI_CDNS_HRS04		0x10		/* PHY access port */
> +/* HRS04 (PHY access) bitfields (SD4HC) */
>  #define   SDHCI_CDNS_HRS04_ACK			BIT(26)
>  #define   SDHCI_CDNS_HRS04_RD			BIT(25)
>  #define   SDHCI_CDNS_HRS04_WR			BIT(24)
> @@ -71,13 +66,6 @@
>  #define SDHCI_CDNS_PHY_DLY_HSMMC	0x0c
>  #define SDHCI_CDNS_PHY_DLY_STROBE	0x0d
>  
> -/*
> - * The tuned val register is 6 bit-wide, but not the whole of the range is
> - * available.  The range 0-42 seems to be available (then 43 wraps around to 0)
> - * but I am not quite sure if it is official.  Use only 0 to 39 for safety.
> - */
> -#define SDHCI_CDNS_MAX_TUNING_LOOP	40
> -
>  struct sdhci_cdns4_phy_param {
>  	u8 addr;
>  	u8 data;
> @@ -88,16 +76,6 @@ struct sdhci_cdns4_phy {
>  	struct sdhci_cdns4_phy_param phy_params[];
>  };
>  
> -struct sdhci_cdns_priv {
> -	void __iomem *hrs_addr;
> -	void __iomem *ctl_addr;	/* write control */
> -	spinlock_t wrlock;	/* write lock */
> -	bool enhanced_strobe;
> -	void (*priv_writel)(struct sdhci_cdns_priv *priv, u32 val, void __iomem *reg);
> -	struct reset_control *rst_hw;
> -	struct sdhci_cdns4_phy *phy;
> -};
> -
>  struct sdhci_cdns4_phy_cfg {
>  	const char *property;
>  	u8 addr;
> @@ -206,13 +184,6 @@ static int sdhci_cdns4_phy_init(struct sdhci_cdns_priv *priv)
>  	return 0;
>  }
>  
> -static void *sdhci_cdns_get_priv(struct sdhci_host *host)
> -{
> -	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> -
> -	return sdhci_pltfm_priv(pltfm_host);
> -}
> -
>  static unsigned int sdhci_cdns_get_timeout_clock(struct sdhci_host *host)
>  {
>  	/*
> @@ -248,6 +219,9 @@ static int sdhci_cdns_set_tune_val(struct sdhci_host *host, unsigned int val)
>  	u32 tmp;
>  	int i, ret;
>  
> +	if (host->version >= SDHCI_SPEC_420)
> +		return sdhci_cdns6_set_tune_val(host, val);
> +
>  	if (WARN_ON(!FIELD_FIT(SDHCI_CDNS_HRS06_TUNE, val)))
>  		return -EINVAL;
>  
> @@ -328,8 +302,11 @@ static int sdhci_cdns_execute_tuning(struct sdhci_host *host, u32 opcode)
>  	 * The delay is set by probe, based on the DT properties.
>  	 */
>  	if (host->timing != MMC_TIMING_MMC_HS200 &&
> -	    host->timing != MMC_TIMING_UHS_SDR104)
> +	    host->timing != MMC_TIMING_UHS_SDR104) {
> +		dev_dbg(mmc_dev(host->mmc), "Tuning skipped (timing: %d)\n",
> +			host->timing);
>  		return 0;
> +	}
>  
>  	for (i = 0; i < SDHCI_CDNS_MAX_TUNING_LOOP; i++) {
>  		if (sdhci_cdns_set_tune_val(host, i) ||
> @@ -353,6 +330,10 @@ static int sdhci_cdns_execute_tuning(struct sdhci_host *host, u32 opcode)
>  	if (ret)
>  		return ret;
>  
> +	/* Block gap tuning is only required for SD4HC, not for SD6HC */
> +	if (host->version >= SDHCI_SPEC_420)
> +		return 0;
> +
>  	return sdhci_cdns_tune_blkgap(host->mmc);
>  }
>  
> @@ -388,6 +369,10 @@ static void sdhci_cdns_set_uhs_signaling(struct sdhci_host *host,
>  	/* For SD, fall back to the default handler */
>  	if (mode == SDHCI_CDNS_HRS06_MODE_SD)
>  		sdhci_set_uhs_signaling(host, timing);
> +
> +	/* For host controller V6, set SDHCI and PHY registers for UHS signaling */
> +	if (host->version >= SDHCI_SPEC_420)
> +		sdhci_cdns6_set_uhs_signaling(host, timing);
>  }
>  
>  /* Elba control register bits [6:3] are byte-lane enables */
> @@ -484,6 +469,16 @@ static const struct sdhci_ops sdhci_cdns4_ops = {
>  	.set_uhs_signaling = sdhci_cdns_set_uhs_signaling,
>  };
>  
> +static const struct sdhci_ops sdhci_cdns6_ops = {
> +	.set_clock = sdhci_set_clock,
> +	.get_timeout_clock = sdhci_cdns_get_timeout_clock,
> +	.set_bus_width = sdhci_set_bus_width,
> +	.reset = sdhci_reset,
> +	.platform_execute_tuning = sdhci_cdns_execute_tuning,
> +	.set_uhs_signaling = sdhci_cdns_set_uhs_signaling,
> +	.hw_reset = sdhci_cdns6_hw_reset,
> +};
> +
>  static const struct sdhci_cdns_drv_data sdhci_cdns_uniphier_drv_data = {
>  	.pltfm_data = {
>  		.ops = &sdhci_cdns4_ops,
> @@ -511,6 +506,12 @@ static const struct sdhci_cdns_drv_data sdhci_cdns4_drv_data = {
>  	},
>  };
>  
> +static const struct sdhci_cdns_drv_data sdhci_cdns6_drv_data = {
> +	.pltfm_data = {
> +		.ops = &sdhci_cdns6_ops,
> +	},
> +};
> +
>  static void sdhci_cdns_hs400_enhanced_strobe(struct mmc_host *mmc,
>  					     struct mmc_ios *ios)
>  {
> @@ -607,15 +608,24 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>  			return ret;
>  	}
>  	sdhci_enable_v4_mode(host);
> -	__sdhci_read_caps(host, &version, NULL, NULL);
> -
>  	sdhci_get_of_property(pdev);
>  
>  	ret = mmc_of_parse(host->mmc);
>  	if (ret)
>  		return ret;
>  
> -	ret = sdhci_cdns4_phy_probe(pdev, priv);
> +	/*
> +	 * For SD4HC, read capabilities with fixed version override.
> +	 * For SD6HC, sdhci_add_host() will automatically read capabilities
> +	 * and version from the host controller registers.
> +	 */
> +	if (of_device_is_compatible(dev->of_node, "cdns,sd4hc")) {
> +		__sdhci_read_caps(host, &version, NULL, NULL);
> +		ret = sdhci_cdns4_phy_probe(pdev, priv);
> +	} else {
> +		ret = sdhci_cdns6_phy_probe(pdev, priv);
> +	}
> +
>  	if (ret)
>  		return ret;
>  
> @@ -642,7 +652,11 @@ static int sdhci_cdns_resume(struct device *dev)
>  	if (ret)
>  		return ret;
>  
> -	ret = sdhci_cdns4_phy_init(priv);
> +	if (host->version >= SDHCI_SPEC_420)
> +		ret = sdhci_cdns6_phy_init(priv);
> +	else
> +		ret = sdhci_cdns4_phy_init(priv);
> +
>  	if (ret)
>  		goto disable_clk;
>  
> @@ -677,6 +691,10 @@ static const struct of_device_id sdhci_cdns_match[] = {
>  		.compatible = "cdns,sd4hc",
>  		.data = &sdhci_cdns4_drv_data,
>  	},
> +	{
> +		.compatible = "cdns,sd6hc",
> +		.data = &sdhci_cdns6_drv_data,
> +	},
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, sdhci_cdns_match);
> diff --git a/drivers/mmc/host/sdhci-cadence6.c b/drivers/mmc/host/sdhci-cadence6.c
> new file mode 100644
> index 000000000000..34d3570a0bbb
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-cadence6.c
> @@ -0,0 +1,1051 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * PHY and host controller support for Cadence SD6HC SDHCI
> + *
> + * This file provides comprehensive support for Cadence's sixth-generation
> + * SDHCI controller (SD6HC), handling both low-level PHY operations and
> + * high-level host controller programming. The implementation includes PHY
> + * initialization and timing calculations, DLL (Delay-Locked Loop)
> + * management and configuration, host controller register programming for
> + * IO delay compensation and signal timing optimization.
> + *
> + * Copyright (C) 2026 Altera Corporation
> + *   Author: Tanmay Kathpalia <tanmay.kathpalia@xxxxxxxxxx>
> + */
> +
> +#include "sdhci-cadence.h"
> +
> +/* IO Delay Information */
> +#define SDHCI_CDNS_HRS07		0x1c
> +#define   SDHCI_CDNS_HRS07_RW_COMPENSATE	GENMASK(20, 16)
> +#define   SDHCI_CDNS_HRS07_IDELAY_VAL		GENMASK(4, 0)
> +
> +/* PHY Control and Status */
> +#define SDHCI_CDNS_HRS09		0x24
> +#define   SDHCI_CDNS_HRS09_RDDATA_EN		BIT(16)
> +#define   SDHCI_CDNS_HRS09_RDCMD_EN		BIT(15)
> +#define   SDHCI_CDNS_HRS09_EXTENDED_WR_MODE	BIT(3)
> +#define   SDHCI_CDNS_HRS09_EXTENDED_RD_MODE	BIT(2)
> +#define   SDHCI_CDNS_HRS09_PHY_INIT_COMPLETE	BIT(1)
> +#define   SDHCI_CDNS_HRS09_PHY_SW_RESET		BIT(0)
> +
> +/* SDCLK start point adjustment */
> +#define SDHCI_CDNS_HRS10		0x28
> +#define   SDHCI_CDNS_HRS10_HCSDCLKADJ		GENMASK(19, 16)
> +
> +/* eMMC Control */
> +#define SDHCI_CDNS_HRS11		0x2c
> +#define   SDHCI_CDNS_HRS11_EMMC_RST		BIT(0) /* eMMC reset */
> +
> +/* CMD/DAT output delay */
> +#define SDHCI_CDNS_HRS16		0x40
> +#define   SDHCI_CDNS_HRS16_WRDATA1_SDCLK_DLY	GENMASK(31, 28)
> +#define   SDHCI_CDNS_HRS16_WRDATA0_SDCLK_DLY	GENMASK(27, 24)
> +#define   SDHCI_CDNS_HRS16_WRCMD1_SDCLK_DLY	GENMASK(23, 20)
> +#define   SDHCI_CDNS_HRS16_WRCMD0_SDCLK_DLY	GENMASK(19, 16)
> +#define   SDHCI_CDNS_HRS16_WRDATA1_DLY		GENMASK(15, 12)
> +#define   SDHCI_CDNS_HRS16_WRDATA0_DLY		GENMASK(11, 8)
> +#define   SDHCI_CDNS_HRS16_WRCMD1_DLY		GENMASK(7, 4)
> +#define   SDHCI_CDNS_HRS16_WRCMD0_DLY		GENMASK(3, 0)
> +
> +/* PHY Special Function Registers */
> +/* DQ timing */
> +#define SDHCI_CDNS6_PHY_DQ_TIMING_REG			0x2000
> +#define   SDHCI_CDNS6_PHY_DQ_TIMING_IO_MASK_ALWAYS_ON		BIT(31)
> +#define   SDHCI_CDNS6_PHY_DQ_TIMING_IO_MASK_END			GENMASK(29, 27)
> +#define   SDHCI_CDNS6_PHY_DQ_TIMING_IO_MASK_START		GENMASK(26, 24)
> +#define   SDHCI_CDNS6_PHY_DQ_TIMING_DATA_SELECT_OE_END		GENMASK(2, 0)
> +
> +/* DQS timing */
> +#define SDHCI_CDNS6_PHY_DQS_TIMING_REG			0x2004
> +#define   SDHCI_CDNS6_PHY_DQS_TIMING_USE_EXT_LPBK_DQS		BIT(22)
> +#define   SDHCI_CDNS6_PHY_DQS_TIMING_USE_LPBK_DQS		BIT(21)
> +#define   SDHCI_CDNS6_PHY_DQS_TIMING_USE_PHONY_DQS		BIT(20)
> +#define   SDHCI_CDNS6_PHY_DQS_TIMING_USE_PHONY_DQS_CMD		BIT(19)
> +
> +/* Gate and loopback control */
> +#define SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_REG		0x2008
> +#define   SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_SYNC_METHOD		BIT(31)
> +#define   SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_SW_HALF_CYCLE_SHIFT	BIT(28)
> +#define   SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_RD_DEL_SEL		GENMASK(24, 19)
> +#define   SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_UNDERRUN_SUPPRESS	BIT(18)
> +#define   SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_GATE_CFG_ALWAYS_ON	BIT(6)
> +
> +/* Master DLL logic */
> +#define SDHCI_CDNS6_PHY_DLL_MASTER_CTRL_REG		0x200c
> +#define   SDHCI_CDNS6_PHY_DLL_MASTER_CTRL_BYPASS_MODE		BIT(23)
> +#define   SDHCI_CDNS6_PHY_DLL_MASTER_CTRL_PHASE_DETECT_SEL	GENMASK(22, 20)
> +#define   SDHCI_CDNS6_PHY_DLL_MASTER_CTRL_DLL_LOCK_NUM		GENMASK(18, 16)
> +#define   SDHCI_CDNS6_PHY_DLL_MASTER_CTRL_DLL_START_POINT	GENMASK(7, 0)
> +
> +/* Slave DLL logic */
> +#define SDHCI_CDNS6_PHY_DLL_SLAVE_CTRL_REG		0x2010
> +#define   SDHCI_CDNS6_PHY_DLL_SLAVE_CTRL_READ_DQS_CMD_DELAY	GENMASK(31, 24)
> +#define   SDHCI_CDNS6_PHY_DLL_SLAVE_CTRL_CLK_WRDQS_DELAY	GENMASK(23, 16)
> +#define   SDHCI_CDNS6_PHY_DLL_SLAVE_CTRL_CLK_WR_DELAY		GENMASK(15, 8)
> +#define   SDHCI_CDNS6_PHY_DLL_SLAVE_CTRL_READ_DQS_DELAY		GENMASK(7, 0)
> +
> +/* Global control settings */
> +#define SDHCI_CDNS6_PHY_CTRL_REG			0x2080
> +#define   SDHCI_CDNS6_PHY_CTRL_PHONY_DQS_TIMING			GENMASK(9, 4)
> +
> +/* Default PHY settings */
> +#define SDHCI_CDNS6_PHY_DEFAULT_IOCELL_DELAY	2500
> +#define SDHCI_CDNS6_PHY_DEFAULT_DELAY_ELEMENT	24
> +#define SDHCI_CDNS6_PHY_DEFAULT_RD_DEL_SEL	52
> +#define SDHCI_CDNS6_PHY_DEFAULT_DLL_START	4
> +
> +/* Scale tuning tap (0..39) to 8-bit PHY DLL delay field (0..255) */
> +#define SDHCI_CDNS6_PHY_DLL_FIELD_SIZE		256
> +
> +struct sdhci_cdns6_phy {
> +	/*
> +	 * Mode-specific timing constraints (in picoseconds)
> +	 * These define valid output/input windows per SD/eMMC spec
> +	 */
> +	u32 t_cmd_output_min;
> +	u32 t_cmd_output_max;
> +	u32 t_dat_output_min;
> +	u32 t_dat_output_max;
> +	u32 t_cmd_input_min;
> +	u32 t_cmd_input_max;
> +	u32 t_dat_input_min;
> +	u32 t_dat_input_max;
> +
> +	/*
> +	 * PHY delay configuration (in picoseconds)
> +	 * Derived from clock period and board-level IO cell delays
> +	 */
> +	u32 phy_sdclk_delay;
> +	u32 phy_cmd_o_delay;
> +	u32 phy_dat_o_delay;
> +	u32 iocell_input_delay;
> +	u32 iocell_output_delay;
> +	u32 delay_element_org;	/* Original delay element from DT */
> +	u32 delay_element;	/* Current delay element (may be doubled) */
> +
> +	/* PHY_DLL_SLAVE_CTRL register fields */
> +	u32 cp_read_dqs_cmd_delay;
> +	u32 cp_read_dqs_delay;
> +	u32 cp_clk_wr_delay;
> +	u32 cp_clk_wrdqs_delay;
> +
> +	/* PHY_DLL_MASTER_CTRL register fields */
> +	u32 cp_dll_bypass_mode;
> +	u32 cp_dll_start_point;
> +
> +	/* PHY_GATE_LPBK_CTRL register fields */
> +	u32 cp_gate_cfg_always_on;
> +	u32 cp_sync_method;
> +	u32 cp_rd_del_sel;
> +	u32 cp_sw_half_cycle_shift;
> +	u32 cp_underrun_suppress;
> +
> +	/* PHY_DQ_TIMING register fields */
> +	u32 cp_io_mask_always_on;
> +	u32 cp_io_mask_end;
> +	u32 cp_io_mask_start;
> +	u32 cp_data_select_oe_end;
> +
> +	/* PHY_DQS_TIMING register fields */
> +	u32 cp_use_ext_lpbk_dqs;
> +	u32 cp_use_lpbk_dqs;
> +	u8 cp_use_phony_dqs;
> +	u8 cp_use_phony_dqs_cmd;
> +
> +	/* HRS09 register fields - PHY control and Status */
> +	u8 sdhc_extended_rd_mode;
> +	u8 sdhc_extended_wr_mode;
> +	u32 sdhc_rdcmd_en;
> +	u32 sdhc_rddata_en;
> +
> +	/* HRS10 register - SDCLK start point adjustment */
> +	u32 sdhc_hcsdclkadj;
> +
> +	/* HRS07 register - IO delay Information */
> +	u32 sdhc_idelay_val;
> +	u32 sdhc_rw_compensate;
> +
> +	/* HRS16 register fields - CMD/DAT output delay control */
> +	u32 sdhc_wrcmd0_dly;
> +	u32 sdhc_wrcmd0_sdclk_dly;
> +	u32 sdhc_wrcmd1_dly;
> +	u32 sdhc_wrcmd1_sdclk_dly;
> +	u32 sdhc_wrdata0_dly;
> +	u32 sdhc_wrdata0_sdclk_dly;
> +	u32 sdhc_wrdata1_dly;
> +	u32 sdhc_wrdata1_sdclk_dly;
> +
> +	/*
> +	 * DLL calculation intermediate values
> +	 * Used during PHY timing calculations
> +	 */
> +	u32 t_sdmclk_calc;	/* Calculated SDMCLK period for DLL */
> +	u32 dll_max_value;	/* Max DLL delay value (127/255/256) */
> +
> +	/* Tuning value for HS200/HS400 modes */
> +	u32 hs200_tune_val;
> +
> +	/* Clock periods (in picoseconds) */
> +	u32 t_sdmclk;		/* Master clock period */
> +	u32 t_sdclk;		/* SD card clock period */
> +
> +	/* Current operating state */
> +	bool strobe_cmd;	/* Enhanced strobe for CMD line */
> +	unsigned int mode;	/* Current MMC_TIMING_* mode */
> +};
> +
> +/**
> + * init_ds() - Initialize PHY timing for Default Speed mode (up to 25 MHz).
> + * @phy: Pointer to SD6HC PHY state.
> + * @t_sdclk: SD clock period in picoseconds.
> + */
> +static void init_ds(struct sdhci_cdns6_phy *phy, u32 t_sdclk)
> +{
> +	phy->t_cmd_output_min = 5000;
> +	phy->t_cmd_output_max = t_sdclk - 5000;
> +	phy->t_dat_output_min = 5000;
> +	phy->t_dat_output_max = t_sdclk - 5000;
> +	phy->t_cmd_input_min = t_sdclk / 2 + 14000;
> +	phy->t_cmd_input_max = t_sdclk + t_sdclk / 2;
> +	phy->t_dat_input_min = t_sdclk / 2 + 14000;
> +	phy->t_dat_input_max = t_sdclk + t_sdclk / 2;
> +}
> +
> +/**
> + * init_hs() - Initialize PHY timing for High Speed mode (up to 50 MHz).
> + * @phy: Pointer to SD6HC PHY state.
> + * @t_sdclk: SD clock period in picoseconds.
> + */
> +static void init_hs(struct sdhci_cdns6_phy *phy, u32 t_sdclk)
> +{
> +	phy->t_cmd_output_min = 2000;
> +	phy->t_cmd_output_max = t_sdclk - 6000;
> +	phy->t_dat_output_min = 2000;
> +	phy->t_dat_output_max = t_sdclk - 6000;
> +	phy->t_cmd_input_min = 14000;
> +	phy->t_cmd_input_max = t_sdclk + 2500;
> +	phy->t_dat_input_min = 14000;
> +	phy->t_dat_input_max = t_sdclk + 2500;
> +}
> +
> +/**
> + * init_uhs_sdr12() - Initialize PHY timing for UHS SDR12 mode (up to 25 MHz).
> + * @phy: Pointer to SD6HC PHY state.
> + * @t_sdclk: SD clock period in picoseconds.
> + */
> +static void init_uhs_sdr12(struct sdhci_cdns6_phy *phy, u32 t_sdclk)
> +{
> +	phy->t_cmd_output_min = 800;
> +	phy->t_cmd_output_max = t_sdclk - 3000;
> +	phy->t_dat_output_min = 800;
> +	phy->t_dat_output_max = t_sdclk - 3000;
> +	phy->t_cmd_input_min = 14000;
> +	phy->t_cmd_input_max = t_sdclk + 1500;
> +	phy->t_dat_input_min = 14000;
> +	phy->t_dat_input_max = t_sdclk + 1500;
> +}
> +
> +/**
> + * init_uhs_sdr25() - Initialize PHY timing for UHS SDR25 mode (up to 50 MHz).
> + * @phy: Pointer to SD6HC PHY state.
> + * @t_sdclk: SD clock period in picoseconds.
> + */
> +static void init_uhs_sdr25(struct sdhci_cdns6_phy *phy, u32 t_sdclk)
> +{
> +	phy->t_cmd_output_min = 800;
> +	phy->t_cmd_output_max = t_sdclk - 3000;
> +	phy->t_dat_output_min = 800;
> +	phy->t_dat_output_max = t_sdclk - 3000;
> +	phy->t_cmd_input_min = 14000;
> +	phy->t_cmd_input_max = t_sdclk + 1500;
> +	phy->t_dat_input_min = 14000;
> +	phy->t_dat_input_max = t_sdclk + 1500;
> +}
> +
> +/**
> + * init_uhs_sdr50() - Initialize PHY timing for UHS SDR50 mode (up to 100 MHz).
> + * @phy: Pointer to SD6HC PHY state.
> + * @t_sdclk: SD clock period in picoseconds.
> + */
> +static void init_uhs_sdr50(struct sdhci_cdns6_phy *phy, u32 t_sdclk)
> +{
> +	phy->t_cmd_output_min = 800;
> +	phy->t_cmd_output_max = t_sdclk - 3000;
> +	phy->t_dat_output_min = 800;
> +	phy->t_dat_output_max = t_sdclk - 3000;
> +	phy->t_cmd_input_min = 7500;
> +	phy->t_cmd_input_max = t_sdclk + 1500;
> +	phy->t_dat_input_min = 7500;
> +	phy->t_dat_input_max = t_sdclk + 1500;
> +}
> +
> +/**
> + * init_uhs_sdr104() - Initialize PHY timing for UHS SDR104 mode (up to 208 MHz).
> + * @phy: Pointer to SD6HC PHY state.
> + * @t_sdclk: SD clock period in picoseconds.
> + */
> +static void init_uhs_sdr104(struct sdhci_cdns6_phy *phy, u32 t_sdclk)
> +{
> +	phy->t_cmd_output_min = 800;
> +	phy->t_cmd_output_max = t_sdclk - 1400;
> +	phy->t_dat_output_min = 800;
> +	phy->t_dat_output_max = t_sdclk - 1400;
> +	phy->t_cmd_input_min = 1000;
> +	phy->t_cmd_input_max = t_sdclk + 1000;
> +	phy->t_dat_input_min = 1000;
> +	phy->t_dat_input_max = t_sdclk + 1000;
> +}
> +
> +/**
> + * init_uhs_ddr50() - Initialize PHY timing for UHS DDR50 mode (up to 50 MHz DDR).
> + * @phy: Pointer to SD6HC PHY state.
> + * @t_sdclk: SD clock period in picoseconds.
> + */
> +static void init_uhs_ddr50(struct sdhci_cdns6_phy *phy, u32 t_sdclk)
> +{
> +	phy->t_cmd_output_min = 800;
> +	phy->t_cmd_output_max = t_sdclk - 3000;
> +	phy->t_dat_output_min = 800;
> +	phy->t_dat_output_max = t_sdclk - 3000;
> +	phy->t_cmd_input_min = 13700;
> +	phy->t_cmd_input_max = t_sdclk + 1500;
> +	phy->t_dat_input_min = 7000;
> +	phy->t_dat_input_max = t_sdclk + 1500;
> +}
> +
> +/**
> + * init_emmc_sdr() - Initialize PHY timing for eMMC legacy/SDR mode.
> + * @phy: Pointer to SD6HC PHY state.
> + * @t_sdclk: SD clock period in picoseconds.
> + */
> +static void init_emmc_sdr(struct sdhci_cdns6_phy *phy, u32 t_sdclk)
> +{
> +	phy->t_cmd_output_min = 3000;
> +	phy->t_cmd_output_max = t_sdclk - 3000;
> +	phy->t_dat_output_min = 3000;
> +	phy->t_dat_output_max = t_sdclk - 3000;
> +	phy->t_cmd_input_min = 13700;
> +	phy->t_cmd_input_max = t_sdclk + 2500;
> +	phy->t_dat_input_min = 13700;
> +	phy->t_dat_input_max = t_sdclk + 2500;
> +}
> +
> +/**
> + * init_emmc_ddr() - Initialize PHY timing for eMMC DDR52 mode.
> + * @phy: Pointer to SD6HC PHY state.
> + * @t_sdclk: SD clock period in picoseconds.
> + */
> +static void init_emmc_ddr(struct sdhci_cdns6_phy *phy, u32 t_sdclk)
> +{
> +	phy->t_cmd_output_min = 3000;
> +	phy->t_cmd_output_max = t_sdclk - 3000;
> +	phy->t_dat_output_min = 2500;
> +	phy->t_dat_output_max = t_sdclk - 2500;
> +	phy->t_cmd_input_min = 13700;
> +	phy->t_cmd_input_max = t_sdclk + 2500;
> +	phy->t_dat_input_min = 7000;
> +	phy->t_dat_input_max = t_sdclk + 1500;
> +}
> +
> +/**
> + * init_emmc_hs200() - Initialize PHY timing for eMMC HS200 mode (up to 200 MHz).
> + * @phy: Pointer to SD6HC PHY state.
> + * @t_sdclk: SD clock period in picoseconds.
> + */
> +static void init_emmc_hs200(struct sdhci_cdns6_phy *phy, u32 t_sdclk)
> +{
> +	phy->t_cmd_output_min = 800;
> +	phy->t_cmd_output_max = t_sdclk - 1400;
> +	phy->t_dat_output_min = 800;
> +	phy->t_dat_output_max = t_sdclk - 1400;
> +	phy->t_cmd_input_min = 1000;
> +	phy->t_cmd_input_max = t_sdclk + 1000;
> +	phy->t_dat_input_min = 1000;
> +	phy->t_dat_input_max = t_sdclk + 1000;
> +}
> +
> +/**
> + * init_emmc_hs400() - Initialize PHY timing for eMMC HS400/HS400ES mode.
> + * @phy: Pointer to SD6HC PHY state.
> + * @t_sdclk: SD clock period in picoseconds.
> + */
> +static void init_emmc_hs400(struct sdhci_cdns6_phy *phy, u32 t_sdclk)
> +{
> +	phy->t_cmd_output_min = 800;
> +	phy->t_cmd_output_max = t_sdclk - 1400;
> +	phy->t_dat_output_min = 400;
> +	phy->t_dat_output_max = t_sdclk - 400;
> +	phy->t_cmd_input_min = 1000;
> +	phy->t_cmd_input_max = t_sdclk + 1000;
> +	phy->t_dat_input_min = 1000;
> +	phy->t_dat_input_max = t_sdclk + 1000;
> +}
> +
> +/*
> + * init_timings - PHY timing initializers indexed by MMC_TIMING_* value.
> + *
> + * Each entry corresponds to a MMC_TIMING_* constant and sets the
> + * appropriate cmd/dat output and input timing windows in the PHY
> + * state struct. Must stay in sync with the MMC_TIMING_* definitions
> + * in include/linux/mmc/host.h.
> + */
> +static void (*init_timings[])(struct sdhci_cdns6_phy *, u32) = {
> +	&init_ds,
> +	&init_emmc_sdr,
> +	&init_hs,
> +	&init_uhs_sdr12,
> +	&init_uhs_sdr25,
> +	&init_uhs_sdr50,
> +	&init_uhs_sdr104,
> +	&init_uhs_ddr50,
> +	&init_emmc_ddr,
> +	&init_emmc_hs200,
> +	&init_emmc_hs400,
> +};
> +
> +static unsigned int sdhci_cdns6_read_phy_reg(struct sdhci_cdns_priv *priv,
> +					     const u32 address)
> +{
> +	writel(address, priv->hrs_addr + SDHCI_CDNS_HRS04);
> +	return readl(priv->hrs_addr + SDHCI_CDNS_HRS05);
> +}
> +
> +static void sdhci_cdns6_write_phy_reg(struct sdhci_cdns_priv *priv,
> +				      const u32 address, const u32 value)
> +{
> +	writel(address, priv->hrs_addr + SDHCI_CDNS_HRS04);
> +	writel(value, priv->hrs_addr + SDHCI_CDNS_HRS05);
> +}
> +
> +static int sdhci_cdns6_phy_lock_dll(struct sdhci_cdns6_phy *phy)
> +{
> +	u32 delay_element = phy->delay_element_org;
> +	u32 delay_elements_in_sdmclk;
> +
> +	delay_elements_in_sdmclk = DIV_ROUND_UP(phy->t_sdmclk, delay_element);
> +	if (delay_elements_in_sdmclk > 256) {
> +		delay_element *= 2;
> +		delay_elements_in_sdmclk = DIV_ROUND_UP(phy->t_sdmclk,
> +							delay_element);
> +
> +		if (delay_elements_in_sdmclk > 256)
> +			return -EINVAL;
> +
> +		phy->dll_max_value = 127;
> +	} else {
> +		phy->dll_max_value = 255;
> +	}
> +
> +	phy->t_sdmclk_calc = delay_element * delay_elements_in_sdmclk;
> +	phy->delay_element = delay_element;
> +	phy->cp_dll_bypass_mode = 0;
> +
> +	return 0;
> +}
> +
> +static void sdhci_cdns6_phy_dll_bypass(struct sdhci_cdns6_phy *phy)
> +{
> +	phy->dll_max_value = 256;
> +	phy->cp_dll_bypass_mode = 1;
> +}
> +
> +static void sdhci_cdns6_phy_configure_dll(struct sdhci_cdns6_phy *phy)
> +{
> +	if (phy->sdhc_extended_wr_mode == 0) {
> +		if (sdhci_cdns6_phy_lock_dll(phy) == 0)
> +			return;
> +	}
> +	sdhci_cdns6_phy_dll_bypass(phy);
> +}
> +
> +static void sdhci_cdns6_phy_calc_out(struct sdhci_cdns6_phy *phy,
> +				     bool cmd_not_dat)
> +{
> +	u32 wr0_dly = 0, wr1_dly = 0, output_min, output_max, phy_o_delay,
> +	    clk_wr_delay = 0, wr0_sdclk_dly = 0, wr1_sdclk_dly = 0;
> +	bool ddr = (phy->mode == MMC_TIMING_UHS_DDR50) ||
> +			(phy->mode == MMC_TIMING_MMC_DDR52) ||
> +			(phy->mode == MMC_TIMING_MMC_HS400);
> +	bool data_ddr = ddr && !cmd_not_dat;
> +	int t;
> +
> +	if (cmd_not_dat) {
> +		output_min = phy->t_cmd_output_min;
> +		output_max = phy->t_cmd_output_max;
> +		phy_o_delay = phy->phy_cmd_o_delay;
> +	} else {
> +		output_min = phy->t_dat_output_min;
> +		output_max = phy->t_dat_output_max;
> +		phy_o_delay = phy->phy_dat_o_delay;
> +	}
> +
> +	if (data_ddr) {
> +		wr0_sdclk_dly = 1;
> +		wr1_sdclk_dly = 1;
> +	}
> +
> +	t = phy_o_delay - phy->phy_sdclk_delay - output_min;
> +	if (t < 0 && phy->sdhc_extended_wr_mode == 1) {
> +		u32 n_half_cycle = DIV_ROUND_UP(-t * 2, phy->t_sdmclk);
> +
> +		wr0_dly = (n_half_cycle + 1) / 2;
> +		if (data_ddr)
> +			wr1_dly = (n_half_cycle + 1) / 2;
> +		else
> +			wr1_dly = (n_half_cycle + 1) % 2 + wr0_dly - 1;
> +	}
> +
> +	if (phy->sdhc_extended_wr_mode == 0) {
> +		u32 out_hold, out_setup, out_hold_margin;
> +		u32 n;
> +
> +		if (!data_ddr)
> +			wr0_dly = 1;
> +
> +		out_setup = output_max;
> +		out_hold = output_min;
> +		out_hold_margin = DIV_ROUND_UP(out_setup - out_hold, 4);
> +		out_hold += out_hold_margin;
> +
> +		if (phy->cp_dll_bypass_mode == 0)
> +			n = DIV_ROUND_UP(256 * out_hold, phy->t_sdmclk_calc);
> +		else
> +			n = DIV_ROUND_UP(out_hold, phy->delay_element) - 1;
> +
> +		if (n <= phy->dll_max_value)
> +			clk_wr_delay = n;
> +		else
> +			clk_wr_delay = 255;
> +	} else {
> +		/*  sdhc_extended_wr_mode = 1 => PHY IO cell work in SDR mode */
> +		clk_wr_delay = 0;
> +	}
> +
> +	if (cmd_not_dat) {
> +		phy->sdhc_wrcmd0_dly = wr0_dly;
> +		phy->sdhc_wrcmd1_dly = wr1_dly;
> +		phy->cp_clk_wrdqs_delay = clk_wr_delay;
> +		phy->sdhc_wrcmd0_sdclk_dly = wr0_sdclk_dly;
> +		phy->sdhc_wrcmd1_sdclk_dly = wr1_sdclk_dly;
> +	} else {
> +		phy->sdhc_wrdata0_dly = wr0_dly;
> +		phy->sdhc_wrdata1_dly = wr1_dly;
> +		phy->cp_clk_wr_delay = clk_wr_delay;
> +		phy->sdhc_wrdata0_sdclk_dly = wr0_sdclk_dly;
> +		phy->sdhc_wrdata1_sdclk_dly = wr1_sdclk_dly;
> +	}
> +}
> +
> +static void sdhci_cdns6_phy_calc_cmd_out(struct sdhci_cdns6_phy *phy)
> +{
> +	sdhci_cdns6_phy_calc_out(phy, true);
> +}
> +
> +static void sdhci_cdns6_phy_calc_cmd_in(struct sdhci_cdns6_phy *phy)
> +{
> +	phy->cp_io_mask_end =
> +		((phy->iocell_output_delay + phy->iocell_input_delay) * 2)
> +		/ phy->t_sdmclk;
> +
> +	/* cp_io_mask_end is a 3-bit field, clamp to max value of 7 */
> +	phy->cp_io_mask_end = min_t(u32, phy->cp_io_mask_end, 7);
> +
> +	if (phy->strobe_cmd && phy->cp_io_mask_end > 0)
> +		phy->cp_io_mask_end--;
> +
> +	if (phy->strobe_cmd) {
> +		phy->cp_use_phony_dqs_cmd = 0;
> +		phy->cp_read_dqs_cmd_delay = 64;
> +	} else {
> +		phy->cp_use_phony_dqs_cmd = 1;
> +		phy->cp_read_dqs_cmd_delay = 0;
> +	}
> +
> +	if ((phy->mode == MMC_TIMING_MMC_HS400 && !phy->strobe_cmd) ||
> +	    phy->mode == MMC_TIMING_MMC_HS200)
> +		phy->cp_read_dqs_cmd_delay =
> +			phy->hs200_tune_val;
> +}
> +
> +static void sdhci_cdns6_phy_calc_dat_in(struct sdhci_cdns6_phy *phy)
> +{
> +	u32 hcsdclkadj = 0;
> +	bool strobe_dat = (phy->mode == MMC_TIMING_MMC_HS400);
> +
> +	if (strobe_dat) {
> +		phy->cp_use_phony_dqs = 0;
> +		phy->cp_read_dqs_delay = 64;
> +	} else {
> +		phy->cp_use_phony_dqs = 1;
> +		phy->cp_read_dqs_delay = 0;
> +	}
> +
> +	if (phy->mode == MMC_TIMING_MMC_HS200)
> +		phy->cp_read_dqs_delay =
> +			phy->hs200_tune_val;
> +
> +	if (strobe_dat) {
> +		/* dqs loopback input via IO cell */
> +		hcsdclkadj += phy->iocell_input_delay;
> +		/* dfi_dqs_in: mem_dqs -> clean_dqs_mod; delay of hic_dll_dqs_nand2 */
> +		hcsdclkadj += phy->delay_element / 2;
> +		/* delay line */
> +		hcsdclkadj += phy->t_sdclk / 2;
> +		/* PHY FIFO write pointer */
> +		hcsdclkadj += phy->t_sdclk / 2 + phy->delay_element;
> +		/* 1st synchronizer */
> +		hcsdclkadj += DIV_ROUND_UP(hcsdclkadj, phy->t_sdmclk)
> +			* phy->t_sdmclk - hcsdclkadj;
> +		/*
> +		 * 2nd synchronizer + PHY FIFO read pointer + PHY rddata
> +		 * + PHY rddata registered, + FIFO 1st ciu_en
> +		 */
> +		hcsdclkadj += 5 * phy->t_sdmclk;
> +		/* FIFO 2nd ciu_en */
> +		hcsdclkadj += phy->t_sdclk;
> +
> +		hcsdclkadj /= phy->t_sdclk;
> +	} else {
> +		u32 n;
> +
> +		/* rebar PHY delay */
> +		hcsdclkadj += 2 * phy->t_sdmclk;
> +		/* rebar output via IO cell */
> +		hcsdclkadj += phy->iocell_output_delay;
> +		/* dqs loopback input via IO cell */
> +		hcsdclkadj += phy->iocell_input_delay;
> +		/* dfi_dqs_in: mem_dqs -> clean_dqs_mod delay of hic_dll_dqs_nand2 */
> +		hcsdclkadj += phy->delay_element / 2;
> +		/* dll: one delay element between SIGI_0 and SIGO_0 */
> +		hcsdclkadj += phy->delay_element;
> +		/* dfi_dqs_in: mem_dqs_delayed -> clk_dqs delay of hic_dll_dqs_nand2 */
> +		hcsdclkadj += phy->delay_element / 2;
> +		/* deskew DLL: clk_dqs -> clk_dqN: one delay element */
> +		hcsdclkadj += phy->delay_element;
> +
> +		if (phy->t_sdclk == phy->t_sdmclk)
> +			n = (hcsdclkadj - 2 * phy->t_sdmclk) / phy->t_sdclk;
> +		else
> +			n = hcsdclkadj / phy->t_sdclk;
> +
> +		/* phase shift within one t_sdclk clock cycle caused by rebar - lbk dqs delay */
> +		hcsdclkadj = hcsdclkadj % phy->t_sdclk;
> +		/* PHY FIFO write pointer */
> +		hcsdclkadj += phy->t_sdclk / 2;
> +		/* 1st synchronizer */
> +		hcsdclkadj += DIV_ROUND_UP(hcsdclkadj, phy->t_sdmclk)
> +			* phy->t_sdmclk - hcsdclkadj;
> +		/*
> +		 * 2nd synchronizer + PHY FIFO read pointer + PHY rddata
> +		 * + PHY rddata registered
> +		 */
> +		hcsdclkadj += 4 * phy->t_sdmclk;
> +
> +		if ((phy->t_sdclk / phy->t_sdmclk) > 1) {
> +			u32 tmp1, tmp2;
> +
> +			tmp1 = hcsdclkadj;
> +			tmp2 = (hcsdclkadj / phy->t_sdclk) * phy->t_sdclk
> +				+ phy->t_sdclk - phy->t_sdmclk;
> +			if (tmp1 == tmp2)
> +				tmp2 += phy->t_sdclk;
> +
> +			/* FIFO aligns to clock cycle before ciu_en */
> +			hcsdclkadj += tmp2 - tmp1;
> +		}
> +
> +		/* FIFO 1st ciu_en */
> +		hcsdclkadj += phy->t_sdmclk;
> +		/* FIFO 2nd ciu_en */
> +		hcsdclkadj += phy->t_sdclk;
> +
> +		hcsdclkadj /= phy->t_sdclk;
> +
> +		hcsdclkadj += n;
> +
> +		if ((phy->t_sdclk / phy->t_sdmclk) >= 2) {
> +			if (phy->mode == MMC_TIMING_UHS_DDR50 ||
> +			    phy->mode == MMC_TIMING_MMC_DDR52)
> +				hcsdclkadj -= 2;
> +			else
> +				hcsdclkadj -= 1;
> +		} else if ((phy->t_sdclk / phy->t_sdmclk) == 1) {
> +			hcsdclkadj += 2;
> +		}
> +
> +		if (phy->mode == MMC_TIMING_UHS_SDR104 || phy->mode == MMC_TIMING_MMC_HS200)
> +			hcsdclkadj -= 1;
> +	}
> +
> +	/* hcsdclkadj is a 4-bit field, clamp to max value of 15 */
> +	if (hcsdclkadj > 15)
> +		hcsdclkadj = 15;
> +
> +	phy->sdhc_hcsdclkadj = hcsdclkadj;
> +}
> +
> +static void sdhci_cdns6_phy_calc_dat_out(struct sdhci_cdns6_phy *phy)
> +{
> +	sdhci_cdns6_phy_calc_out(phy, false);
> +}
> +
> +static void sdhci_cdns6_phy_calc_io(struct sdhci_cdns6_phy *phy)
> +{
> +	u32 rw_compensate;
> +
> +	rw_compensate = ((phy->iocell_input_delay + phy->iocell_output_delay)
> +		/ phy->t_sdmclk) + phy->sdhc_wrdata0_dly + 5 + 3;
> +
> +	phy->sdhc_idelay_val = (2 * phy->iocell_input_delay)
> +		/ phy->t_sdmclk;
> +
> +	phy->cp_io_mask_start = 0;
> +	if (phy->t_sdclk == phy->t_sdmclk && rw_compensate > 10)
> +		phy->cp_io_mask_start = 2 * (rw_compensate - 10);
> +
> +	if (phy->mode == MMC_TIMING_UHS_SDR104)
> +		phy->cp_io_mask_start++;
> +
> +	if (phy->t_sdclk == phy->t_sdmclk && phy->mode == MMC_TIMING_UHS_SDR50)
> +		phy->cp_io_mask_start++;
> +
> +	phy->sdhc_rw_compensate = rw_compensate;
> +}
> +
> +static void sdhci_cdns6_phy_calc_settings(struct sdhci_cdns6_phy *phy)
> +{
> +	sdhci_cdns6_phy_calc_cmd_out(phy);
> +	sdhci_cdns6_phy_calc_cmd_in(phy);
> +	sdhci_cdns6_phy_calc_dat_out(phy);
> +	sdhci_cdns6_phy_calc_dat_in(phy);
> +	sdhci_cdns6_phy_calc_io(phy);
> +}
> +
> +static int sdhci_cdns6_dll_reset(struct sdhci_cdns_priv *priv, bool reset)
> +{
> +	u32 reg;
> +	int ret = 0;
> +
> +	reg = readl(priv->hrs_addr + SDHCI_CDNS_HRS09);
> +	if (reset)
> +		reg &= ~SDHCI_CDNS_HRS09_PHY_SW_RESET;
> +	else
> +		reg |= SDHCI_CDNS_HRS09_PHY_SW_RESET;
> +
> +	writel(reg, priv->hrs_addr + SDHCI_CDNS_HRS09);
> +
> +	/* After reset, wait until HRS09.PHY_INIT_COMPLETE is set to 1 within 3000us*/
> +	if (!reset) {
> +		ret = readl_poll_timeout(priv->hrs_addr + SDHCI_CDNS_HRS09, reg,
> +					 (reg & SDHCI_CDNS_HRS09_PHY_INIT_COMPLETE),
> +					 0, 3000);
> +	}
> +
> +	return ret;
> +}
> +
> +int sdhci_cdns6_phy_init(struct sdhci_cdns_priv *priv)
> +{
> +	int ret;
> +	u32 reg;
> +	struct sdhci_cdns6_phy *phy = priv->phy;
> +
> +	sdhci_cdns6_dll_reset(priv, true);
> +
> +	reg = sdhci_cdns6_read_phy_reg(priv, SDHCI_CDNS6_PHY_DQS_TIMING_REG);
> +	reg &= ~SDHCI_CDNS6_PHY_DQS_TIMING_USE_EXT_LPBK_DQS;
> +	reg &= ~SDHCI_CDNS6_PHY_DQS_TIMING_USE_LPBK_DQS;
> +	reg &= ~SDHCI_CDNS6_PHY_DQS_TIMING_USE_PHONY_DQS;
> +	reg &= ~SDHCI_CDNS6_PHY_DQS_TIMING_USE_PHONY_DQS_CMD;
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DQS_TIMING_USE_EXT_LPBK_DQS,
> +			phy->cp_use_ext_lpbk_dqs);

drivers/mmc/host/sdhci-cadence6.c: In function ‘sdhci_cdns6_phy_init’:
drivers/mmc/host/sdhci-cadence6.c:761:16: error: implicit declaration of function ‘FIELD_PREP’ [-Wimplicit-function-declaration]
  761 |         reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DQS_TIMING_USE_EXT_LPBK_DQS,
      |                ^~~~~~~~~~

> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DQS_TIMING_USE_LPBK_DQS,
> +			phy->cp_use_lpbk_dqs);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DQS_TIMING_USE_PHONY_DQS,
> +			  phy->cp_use_phony_dqs);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DQS_TIMING_USE_PHONY_DQS_CMD,
> +			  phy->cp_use_phony_dqs_cmd);
> +	sdhci_cdns6_write_phy_reg(priv, SDHCI_CDNS6_PHY_DQS_TIMING_REG, reg);
> +
> +	reg = sdhci_cdns6_read_phy_reg(priv, SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_REG);
> +	reg &= ~SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_SYNC_METHOD;
> +	reg &= ~SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_SW_HALF_CYCLE_SHIFT;
> +	reg &= ~SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_RD_DEL_SEL;
> +	reg &= ~SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_UNDERRUN_SUPPRESS;
> +	reg &= ~SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_GATE_CFG_ALWAYS_ON;
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_SYNC_METHOD,
> +			phy->cp_sync_method);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_SW_HALF_CYCLE_SHIFT,
> +			phy->cp_sw_half_cycle_shift);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_RD_DEL_SEL,
> +			phy->cp_rd_del_sel);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_UNDERRUN_SUPPRESS,
> +			phy->cp_underrun_suppress);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_GATE_CFG_ALWAYS_ON,
> +			phy->cp_gate_cfg_always_on);
> +	sdhci_cdns6_write_phy_reg(priv, SDHCI_CDNS6_PHY_GATE_LPBK_CTRL_REG, reg);
> +
> +	reg = FIELD_PREP(SDHCI_CDNS6_PHY_DLL_MASTER_CTRL_BYPASS_MODE,
> +			 phy->cp_dll_bypass_mode);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DLL_MASTER_CTRL_PHASE_DETECT_SEL, 2);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DLL_MASTER_CTRL_DLL_LOCK_NUM, 0);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DLL_MASTER_CTRL_DLL_START_POINT,
> +			phy->cp_dll_start_point);
> +	sdhci_cdns6_write_phy_reg(priv, SDHCI_CDNS6_PHY_DLL_MASTER_CTRL_REG, reg);
> +
> +	reg = FIELD_PREP(SDHCI_CDNS6_PHY_DLL_SLAVE_CTRL_READ_DQS_CMD_DELAY,
> +			 phy->cp_read_dqs_cmd_delay);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DLL_SLAVE_CTRL_CLK_WRDQS_DELAY,
> +			  phy->cp_clk_wrdqs_delay);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DLL_SLAVE_CTRL_CLK_WR_DELAY,
> +			  phy->cp_clk_wr_delay);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DLL_SLAVE_CTRL_READ_DQS_DELAY,
> +			  phy->cp_read_dqs_delay);
> +	sdhci_cdns6_write_phy_reg(priv, SDHCI_CDNS6_PHY_DLL_SLAVE_CTRL_REG, reg);
> +
> +	reg = sdhci_cdns6_read_phy_reg(priv, SDHCI_CDNS6_PHY_CTRL_REG);
> +	reg &= ~SDHCI_CDNS6_PHY_CTRL_PHONY_DQS_TIMING;
> +	sdhci_cdns6_write_phy_reg(priv, SDHCI_CDNS6_PHY_CTRL_REG, reg);
> +
> +	/*
> +	 * Ensure all preceding PHY register writes complete and reach the
> +	 * controller before releasing the PHY from reset. Without this,
> +	 * SDR104 has been observed to fail intermittently on some boards.
> +	 */
> +	wmb();
> +
> +	ret = sdhci_cdns6_dll_reset(priv, false);
> +	if (ret)
> +		return ret;
> +
> +	reg = sdhci_cdns6_read_phy_reg(priv, SDHCI_CDNS6_PHY_DQ_TIMING_REG);
> +	reg &= ~SDHCI_CDNS6_PHY_DQ_TIMING_IO_MASK_ALWAYS_ON;
> +	reg &= ~SDHCI_CDNS6_PHY_DQ_TIMING_IO_MASK_END;
> +	reg &= ~SDHCI_CDNS6_PHY_DQ_TIMING_IO_MASK_START;
> +	reg &= ~SDHCI_CDNS6_PHY_DQ_TIMING_DATA_SELECT_OE_END;
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DQ_TIMING_IO_MASK_ALWAYS_ON,
> +			phy->cp_io_mask_always_on);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DQ_TIMING_IO_MASK_END,
> +			  phy->cp_io_mask_end);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DQ_TIMING_IO_MASK_START,
> +			  phy->cp_io_mask_start);
> +	reg |= FIELD_PREP(SDHCI_CDNS6_PHY_DQ_TIMING_DATA_SELECT_OE_END,
> +			phy->cp_data_select_oe_end);
> +	sdhci_cdns6_write_phy_reg(priv, SDHCI_CDNS6_PHY_DQ_TIMING_REG, reg);
> +
> +	/* Ensure DQ timing programming is visible before HRS09 follow-up writes */
> +	wmb();
> +
> +	reg = readl(priv->hrs_addr + SDHCI_CDNS_HRS09);
> +	if (phy->sdhc_extended_wr_mode)
> +		reg |= SDHCI_CDNS_HRS09_EXTENDED_WR_MODE;
> +	else
> +		reg &= ~SDHCI_CDNS_HRS09_EXTENDED_WR_MODE;
> +
> +	if (phy->sdhc_extended_rd_mode)
> +		reg |= SDHCI_CDNS_HRS09_EXTENDED_RD_MODE;
> +	else
> +		reg &= ~SDHCI_CDNS_HRS09_EXTENDED_RD_MODE;
> +
> +	if (phy->sdhc_rddata_en)
> +		reg |= SDHCI_CDNS_HRS09_RDDATA_EN;
> +	else
> +		reg &= ~SDHCI_CDNS_HRS09_RDDATA_EN;
> +
> +	if (phy->sdhc_rdcmd_en)
> +		reg |= SDHCI_CDNS_HRS09_RDCMD_EN;
> +	else
> +		reg &= ~SDHCI_CDNS_HRS09_RDCMD_EN;
> +
> +	writel(reg, priv->hrs_addr + SDHCI_CDNS_HRS09);
> +
> +	reg = FIELD_PREP(SDHCI_CDNS_HRS10_HCSDCLKADJ, phy->sdhc_hcsdclkadj);
> +	writel(reg, priv->hrs_addr + SDHCI_CDNS_HRS10);
> +
> +	reg = FIELD_PREP(SDHCI_CDNS_HRS16_WRDATA1_SDCLK_DLY,
> +			 phy->sdhc_wrdata1_sdclk_dly);
> +	reg |= FIELD_PREP(SDHCI_CDNS_HRS16_WRDATA0_SDCLK_DLY,
> +			  phy->sdhc_wrdata0_sdclk_dly);
> +	reg |= FIELD_PREP(SDHCI_CDNS_HRS16_WRCMD1_SDCLK_DLY,
> +			  phy->sdhc_wrcmd1_sdclk_dly);
> +	reg |= FIELD_PREP(SDHCI_CDNS_HRS16_WRCMD0_SDCLK_DLY,
> +			  phy->sdhc_wrcmd0_sdclk_dly);
> +	reg |= FIELD_PREP(SDHCI_CDNS_HRS16_WRDATA1_DLY,
> +			  phy->sdhc_wrdata1_dly);
> +	reg |= FIELD_PREP(SDHCI_CDNS_HRS16_WRDATA0_DLY,
> +			  phy->sdhc_wrdata0_dly);
> +	reg |= FIELD_PREP(SDHCI_CDNS_HRS16_WRCMD1_DLY,
> +			  phy->sdhc_wrcmd1_dly);
> +	reg |= FIELD_PREP(SDHCI_CDNS_HRS16_WRCMD0_DLY,
> +			  phy->sdhc_wrcmd0_dly);
> +	writel(reg, priv->hrs_addr + SDHCI_CDNS_HRS16);
> +
> +	reg = FIELD_PREP(SDHCI_CDNS_HRS07_RW_COMPENSATE,
> +			 phy->sdhc_rw_compensate);
> +	reg |= FIELD_PREP(SDHCI_CDNS_HRS07_IDELAY_VAL,
> +			  phy->sdhc_idelay_val);
> +	writel(reg, priv->hrs_addr + SDHCI_CDNS_HRS07);
> +
> +	/* Allow 5ms for clock and PHY signals to stabilize after configuration */
> +	usleep_range(5000, 5500);
> +
> +	return 0;
> +}
> +
> +int sdhci_cdns6_set_tune_val(struct sdhci_host *host,
> +			     unsigned int val)
> +{
> +	struct sdhci_cdns_priv *priv = sdhci_cdns_get_priv(host);
> +	struct sdhci_cdns6_phy *phy = priv->phy;
> +	u32 tuneval;
> +
> +	/*
> +	 * Scale tuning tap (val in [0, SDHCI_CDNS_MAX_TUNING_LOOP-1]) to the
> +	 * 8-bit PHY DLL slave delay field [0, 255]. With MAX_TUNING_LOOP=40
> +	 * and FIELD_SIZE=256, the result fits in 8 bits.
> +	 */
> +	tuneval = (val * SDHCI_CDNS6_PHY_DLL_FIELD_SIZE) /
> +		  SDHCI_CDNS_MAX_TUNING_LOOP;
> +
> +	phy->hs200_tune_val = tuneval;
> +	phy->cp_read_dqs_cmd_delay = tuneval;
> +	phy->cp_read_dqs_delay = tuneval;
> +
> +	return sdhci_cdns6_phy_init(priv);
> +}
> +
> +static int sdhci_cdns6_phy_update_timings(struct sdhci_host *host)
> +{
> +	struct sdhci_cdns_priv *priv = sdhci_cdns_get_priv(host);
> +	struct sdhci_cdns6_phy *phy = priv->phy;
> +	u32 t_sdmclk = phy->t_sdmclk;
> +
> +	/* Validate mode is within supported range */
> +	if (phy->mode >= ARRAY_SIZE(init_timings))
> +		return -EINVAL;
> +
> +	/* initialize input */
> +	init_timings[phy->mode](phy, phy->t_sdclk);
> +
> +	phy->strobe_cmd = false;
> +
> +	if (priv->enhanced_strobe)
> +		phy->strobe_cmd = true;
> +
> +	phy->phy_sdclk_delay = 2 * t_sdmclk;
> +
> +	/*
> +	 * CMD and DAT output delays are currently identical, but kept separate
> +	 * to allow independent tuning for specific modes (e.g., HS400) or
> +	 * board-specific optimizations in the future.
> +	 */
> +	phy->phy_cmd_o_delay = 2 * t_sdmclk + t_sdmclk / 2;
> +	phy->phy_dat_o_delay = 2 * t_sdmclk + t_sdmclk / 2;
> +
> +	if (phy->t_sdclk == phy->t_sdmclk) {
> +		phy->sdhc_extended_wr_mode = 0;
> +		phy->sdhc_extended_rd_mode = 0;
> +	} else {
> +		phy->sdhc_extended_wr_mode = 1;
> +		phy->sdhc_extended_rd_mode = 1;
> +	}
> +
> +	phy->cp_gate_cfg_always_on = 1;
> +
> +	sdhci_cdns6_phy_configure_dll(phy);
> +
> +	sdhci_cdns6_phy_calc_settings(phy);
> +
> +	return 0;
> +}
> +
> +int sdhci_cdns6_phy_probe(struct platform_device *pdev,
> +			  struct sdhci_cdns_priv *priv)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct sdhci_host *host = dev_get_drvdata(dev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	struct sdhci_cdns6_phy *phy;
> +	unsigned long val;
> +	int ret;
> +
> +	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> +	if (!phy)
> +		return -ENOMEM;
> +
> +	val = clk_get_rate(pltfm_host->clk);
> +	if (!val)
> +		return dev_err_probe(dev, -EINVAL,
> +				     "failed to get controller clock rate\n");
> +
> +	phy->t_sdmclk = DIV_ROUND_DOWN_ULL(1000000000000ULL, val);
> +
> +	ret = of_property_read_u32(dev->of_node, "cdns,iocell-input-delay",
> +				   &phy->iocell_input_delay);
> +	if (ret)
> +		phy->iocell_input_delay = SDHCI_CDNS6_PHY_DEFAULT_IOCELL_DELAY;
> +
> +	ret = of_property_read_u32(dev->of_node, "cdns,iocell-output-delay",
> +				   &phy->iocell_output_delay);
> +	if (ret)
> +		phy->iocell_output_delay = SDHCI_CDNS6_PHY_DEFAULT_IOCELL_DELAY;
> +
> +	ret = of_property_read_u32(dev->of_node, "cdns,delay-element",
> +				   &phy->delay_element);
> +	if (ret)
> +		phy->delay_element = SDHCI_CDNS6_PHY_DEFAULT_DELAY_ELEMENT;
> +
> +	phy->delay_element_org = phy->delay_element;
> +
> +	priv->phy = phy;
> +
> +	/* default settings */
> +	phy->sdhc_rdcmd_en = 1;
> +	phy->sdhc_rddata_en = 1;
> +	phy->cp_use_ext_lpbk_dqs = 1;
> +	phy->cp_use_lpbk_dqs = 1;
> +	phy->cp_sync_method = 1;
> +	phy->cp_rd_del_sel = SDHCI_CDNS6_PHY_DEFAULT_RD_DEL_SEL;
> +	phy->cp_dll_start_point = SDHCI_CDNS6_PHY_DEFAULT_DLL_START;
> +	phy->cp_data_select_oe_end = 1;
> +	phy->cp_io_mask_always_on = 0;
> +	phy->cp_underrun_suppress = 1;
> +
> +	return 0;
> +}
> +
> +void sdhci_cdns6_set_uhs_signaling(struct sdhci_host *host, unsigned int timing)
> +{
> +	struct sdhci_cdns_priv *priv = sdhci_cdns_get_priv(host);
> +	struct sdhci_cdns6_phy *phy = priv->phy;
> +
> +	/* Clock may be 0 during initial ios setup; skip PHY update */
> +	if (!host->mmc->ios.clock)
> +		return;
> +
> +	phy->t_sdclk = DIV_ROUND_DOWN_ULL(1000000000000ULL,
> +					  host->mmc->ios.clock);
> +	phy->mode = timing;
> +
> +	if (sdhci_cdns6_phy_update_timings(host))
> +		dev_warn(mmc_dev(host->mmc), "%s: update timings failed\n",
> +			 __func__);
> +
> +	if (sdhci_cdns6_phy_init(priv))
> +		dev_warn(mmc_dev(host->mmc), "%s: phy init failed\n",
> +			 __func__);
> +}
> +
> +void sdhci_cdns6_hw_reset(struct sdhci_host *host)
> +{
> +	struct sdhci_cdns_priv *priv = sdhci_cdns_get_priv(host);
> +	void __iomem *reg;
> +
> +	reg = priv->hrs_addr + SDHCI_CDNS_HRS11;
> +	writel(SDHCI_CDNS_HRS11_EMMC_RST, reg);
> +	/* eMMC HW reset assertion: spec requires >= 1us, give margin */
> +	usleep_range(10, 20);
> +	writel(0, reg);
> +	usleep_range(300, 1000);
> +}