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Subject: Re: [PATCH v2 1/2] phy: Add QMP phy based UFS phy support for sdm845
To:     Can Guo <cang@codeaurora.org>, subhashj@codeaurora.org,
        asutoshd@codeaurora.org, mgautam@codeaurora.org, kishon@ti.com,
        robh+dt@kernel.org, mark.rutland@arm.com
Cc:     linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
References: <20180321053720.12780-1-cang@codeaurora.org>
 <20180321053720.12780-2-cang@codeaurora.org>
From:   Vivek Gautam <vivek.gautam@codeaurora.org>
Message-ID: <383ac034-71a4-7d66-3bcb-d651ef75b4d7@codeaurora.org>
Date:   Mon, 26 Mar 2018 20:26:13 +0530
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Hi Can,


On 3/21/2018 11:07 AM, Can Guo wrote:
> Add UFS PHY support to make SDM845 UFS work with common PHY framework.
>
> Signed-off-by: Can Guo <cang@codeaurora.org>
> ---

Thanks for the patch. Just few minor nits, and we are good. Please see 
comments inline.

>   drivers/phy/qualcomm/phy-qcom-qmp.c | 122 +++++++++++++++++++++++++++++++++++-
>   drivers/phy/qualcomm/phy-qcom-qmp.h |   8 +++
>   2 files changed, 127 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index 5cf2c3c..85d40d4 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -156,6 +156,11 @@ enum qphy_reg_layout {
>   	[QPHY_PCS_LFPS_RXTERM_IRQ_STATUS] = 0x170,
>   };
>   
> +static const unsigned int sdm845_ufsphy_regs_layout[] = {
> +	[QPHY_START_CTRL]		= 0x00,
> +	[QPHY_PCS_READY_STATUS]		= 0x168,
> +};
> +
>   static const struct qmp_phy_init_tbl msm8996_pcie_serdes_tbl[] = {
>   	QMP_PHY_INIT_CFG(QSERDES_COM_BIAS_EN_CLKBUFLR_EN, 0x1c),
>   	QMP_PHY_INIT_CFG(QSERDES_COM_CLK_ENABLE1, 0x10),
> @@ -601,6 +606,73 @@ enum qphy_reg_layout {
>   	QMP_PHY_INIT_CFG(QPHY_V3_PCS_REFGEN_REQ_CONFIG2, 0x60),
>   };
>   
> +static const struct qmp_phy_init_tbl sdm845_ufsphy_serdes_tbl[] = {
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_SYS_CLK_CTRL, 0x02),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_BG_TIMER, 0x0a),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_PLL_IVCO, 0x0f),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_CMN_CONFIG, 0x06),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_SYSCLK_EN_SEL, 0xd5),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_RESETSM_CNTRL, 0x20),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_CLK_SELECT, 0x30),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_HSCLK_SEL, 0x00),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_LOCK_CMP_EN, 0x01),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_VCO_TUNE_CTRL, 0x00),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_CORE_CLK_EN, 0x00),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_VCO_TUNE_MAP, 0x04),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_SVS_MODE_CLK_SEL, 0x05),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_VCO_TUNE_INITVAL1, 0xff),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_VCO_TUNE_INITVAL2, 0x00),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_DEC_START_MODE0, 0x82),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_CP_CTRL_MODE0, 0x06),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_PLL_RCTRL_MODE0, 0x16),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_PLL_CCTRL_MODE0, 0x36),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_INTEGLOOP_GAIN0_MODE0, 0x3f),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_INTEGLOOP_GAIN1_MODE0, 0x00),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_VCO_TUNE1_MODE0, 0xda),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_VCO_TUNE2_MODE0, 0x01),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_LOCK_CMP1_MODE0, 0xff),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_LOCK_CMP2_MODE0, 0x0c),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_DEC_START_MODE1, 0x98),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_CP_CTRL_MODE1, 0x06),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_PLL_RCTRL_MODE1, 0x16),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_PLL_CCTRL_MODE1, 0x36),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_INTEGLOOP_GAIN0_MODE1, 0x3f),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_INTEGLOOP_GAIN1_MODE1, 0x00),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_VCO_TUNE1_MODE1, 0xc1),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_VCO_TUNE2_MODE1, 0x00),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_LOCK_CMP1_MODE1, 0x32),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_LOCK_CMP2_MODE1, 0x0f),
> +
> +	/* Rate B */
> +	QMP_PHY_INIT_CFG(QSERDES_V3_COM_VCO_TUNE_MAP, 0x44),
> +};
> +
> +static const struct qmp_phy_init_tbl sdm845_ufsphy_tx_tbl[] = {
> +	QMP_PHY_INIT_CFG(QSERDES_V3_TX_LANE_MODE_1, 0x06),
> +};
> +
> +static const struct qmp_phy_init_tbl sdm845_ufsphy_rx_tbl[] = {
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_SIGDET_LVL, 0x24),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_SIGDET_CNTRL, 0x0f),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_SIGDET_DEGLITCH_CNTRL, 0x1e),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_RX_INTERFACE_MODE, 0x40),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_UCDR_FASTLOCK_FO_GAIN, 0x0b),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_RX_TERM_BW, 0x5b),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_RX_EQU_ADAPTOR_CNTRL2, 0x06),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_RX_EQU_ADAPTOR_CNTRL3, 0x04),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_RX_EQU_ADAPTOR_CNTRL4, 0x1d),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_UCDR_SVS_SO_GAIN_HALF, 0x04),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_UCDR_SVS_SO_GAIN_QUARTER, 0x04),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_UCDR_SVS_SO_GAIN, 0x04),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_UCDR_SO_SATURATION_AND_ENABLE, 0x4b),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_UCDR_PI_CONTROLS, 0x81),
> +	QMP_PHY_INIT_CFG(QSERDES_V3_RX_UCDR_FASTLOCK_COUNT_LOW, 0x80),
> +};
> +
> +static const struct qmp_phy_init_tbl sdm845_ufsphy_pcs_tbl[] = {
> +	QMP_PHY_INIT_CFG(QPHY_V3_PCS_POWER_DOWN_CONTROL, 0x01),
> +	QMP_PHY_INIT_CFG(QPHY_V3_PCS_MULTI_LANE_CTRL1, 0x02),
> +};
>   
>   /* struct qmp_phy_cfg - per-PHY initialization config */
>   struct qmp_phy_cfg {
> @@ -652,6 +724,9 @@ struct qmp_phy_cfg {
>   	/* Register offset of secondary tx/rx lanes for USB DP combo PHY */
>   	unsigned int tx_b_lane_offset;
>   	unsigned int rx_b_lane_offset;
> +
> +	/* true, if PCS block has a separate SW_RESET register */
> +	bool has_sw_rst;
>   };
>   
>   /**
> @@ -748,6 +823,10 @@ static inline void qphy_clrbits(void __iomem *base, u32 offset, u32 val)
>   	"aux", "cfg_ahb", "ref", "com_aux",
>   };
>   
> +static const char * const sdm845_ufs_phy_clk_l[] = {
> +	"ref_clk", "ref_aux_clk",

Only "ref", "ref_aux" like other clock lists. No need to put explicit 
clk suffix.

> +};
> +
>   /* list of resets */
>   static const char * const msm8996_pciephy_reset_l[] = {
>   	"phy", "common", "cfg",
> @@ -762,6 +841,10 @@ static inline void qphy_clrbits(void __iomem *base, u32 offset, u32 val)
>   	"vdda-phy", "vdda-pll",
>   };
>   
> +static const char * const sdm845_phy_vreg_l[] = {
> +	"vdda-phy", "vdda-pll",
> +};

We can reuse the regulator list that we already has. May be rename that
to something generic.

> +
>   static const struct qmp_phy_cfg msm8996_pciephy_cfg = {
>   	.type			= PHY_TYPE_PCIE,
>   	.nlanes			= 3,
> @@ -791,6 +874,7 @@ static inline void qphy_clrbits(void __iomem *base, u32 offset, u32 val)
>   	.has_pwrdn_delay	= true,
>   	.pwrdn_delay_min	= POWER_DOWN_DELAY_US_MIN,
>   	.pwrdn_delay_max	= POWER_DOWN_DELAY_US_MAX,
> +	.has_sw_rst		= true,
>   };
>   
>   static const struct qmp_phy_cfg msm8996_usb3phy_cfg = {
> @@ -816,6 +900,7 @@ static inline void qphy_clrbits(void __iomem *base, u32 offset, u32 val)
>   	.start_ctrl		= SERDES_START | PCS_START,
>   	.pwrdn_ctrl		= SW_PWRDN,
>   	.mask_pcs_ready		= PHYSTATUS,
> +	.has_sw_rst		= true,
>   };
>   
>   /* list of resets */
> @@ -852,6 +937,7 @@ static inline void qphy_clrbits(void __iomem *base, u32 offset, u32 val)
>   	.has_pwrdn_delay	= true,
>   	.pwrdn_delay_min	= 995,		/* us */
>   	.pwrdn_delay_max	= 1005,		/* us */
> +	.has_sw_rst		= true,
>   };
>   
>   static const struct qmp_phy_cfg qmp_v3_usb3phy_cfg = {
> @@ -885,6 +971,7 @@ static inline void qphy_clrbits(void __iomem *base, u32 offset, u32 val)
>   	.has_phy_dp_com_ctrl	= true,
>   	.tx_b_lane_offset	= 0x400,
>   	.rx_b_lane_offset	= 0x400,
> +	.has_sw_rst		= true,
>   };
>   
>   static const struct qmp_phy_cfg qmp_v3_usb3_uniphy_cfg = {
> @@ -914,6 +1001,30 @@ static inline void qphy_clrbits(void __iomem *base, u32 offset, u32 val)
>   	.has_pwrdn_delay	= true,
>   	.pwrdn_delay_min	= POWER_DOWN_DELAY_US_MIN,
>   	.pwrdn_delay_max	= POWER_DOWN_DELAY_US_MAX,
> +	.has_sw_rst		= true,

If every other has it and not ufs, then better name it otherwise - may 
be "skip_sw_rst", which can be 'true' for UFS.


Best regards
Vivek

> +};
> +
> +static const struct qmp_phy_cfg sdm845_ufsphy_cfg = {
> +	.type			= PHY_TYPE_UFS,
> +	.nlanes			= 2,
> +
> +	.serdes_tbl		= sdm845_ufsphy_serdes_tbl,
> +	.serdes_tbl_num		= ARRAY_SIZE(sdm845_ufsphy_serdes_tbl),
> +	.tx_tbl			= sdm845_ufsphy_tx_tbl,
> +	.tx_tbl_num		= ARRAY_SIZE(sdm845_ufsphy_tx_tbl),
> +	.rx_tbl			= sdm845_ufsphy_rx_tbl,
> +	.rx_tbl_num		= ARRAY_SIZE(sdm845_ufsphy_rx_tbl),
> +	.pcs_tbl		= sdm845_ufsphy_pcs_tbl,
> +	.pcs_tbl_num		= ARRAY_SIZE(sdm845_ufsphy_pcs_tbl),
> +	.clk_list		= sdm845_ufs_phy_clk_l,
> +	.num_clks		= ARRAY_SIZE(sdm845_ufs_phy_clk_l),
> +	.vreg_list		= sdm845_phy_vreg_l,
> +	.num_vregs		= ARRAY_SIZE(sdm845_phy_vreg_l),
> +	.regs			= sdm845_ufsphy_regs_layout,
> +
> +	.start_ctrl		= SERDES_START,
> +	.pwrdn_ctrl		= SW_PWRDN,
> +	.mask_pcs_ready		= PCS_READY,
>   };
>   
>   static void qcom_qmp_phy_configure(void __iomem *base,
> @@ -1140,7 +1251,8 @@ static int qcom_qmp_phy_init(struct phy *phy)
>   		usleep_range(cfg->pwrdn_delay_min, cfg->pwrdn_delay_max);
>   
>   	/* Pull PHY out of reset state */
> -	qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
> +	if (cfg->has_sw_rst)
> +		qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
>   	if (cfg->has_phy_dp_com_ctrl)
>   		qphy_clrbits(dp_com, QPHY_V3_DP_COM_SW_RESET, SW_RESET);
>   
> @@ -1178,7 +1290,8 @@ static int qcom_qmp_phy_exit(struct phy *phy)
>   	clk_disable_unprepare(qphy->pipe_clk);
>   
>   	/* PHY reset */
> -	qphy_setbits(qphy->pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
> +	if (cfg->has_sw_rst)
> +		qphy_setbits(qphy->pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
>   
>   	/* stop SerDes and Phy-Coding-Sublayer */
>   	qphy_clrbits(qphy->pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl);
> @@ -1531,7 +1644,10 @@ int qcom_qmp_phy_create(struct device *dev, struct device_node *np, int id)
>   	}, {
>   		.compatible = "qcom,sdm845-qmp-usb3-uni-phy",
>   		.data = &qmp_v3_usb3_uniphy_cfg,
> -	},
> +	}, {
> +		.compatible = "qcom,sdm845-qmp-ufs-phy",
> +		.data = &sdm845_ufsphy_cfg,
> + 	},
>   	{ },
>   };
>   MODULE_DEVICE_TABLE(of, qcom_qmp_phy_of_match_table);
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.h b/drivers/phy/qualcomm/phy-qcom-qmp.h
> index 5d78d43..3cbcfe1 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.h
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.h
> @@ -184,6 +184,8 @@
>   #define QSERDES_V3_COM_VCO_TUNE2_MODE0			0x0f8
>   #define QSERDES_V3_COM_VCO_TUNE1_MODE1			0x0fc
>   #define QSERDES_V3_COM_VCO_TUNE2_MODE1			0x100
> +#define QSERDES_V3_COM_VCO_TUNE_INITVAL1		0x104
> +#define QSERDES_V3_COM_VCO_TUNE_INITVAL2		0x108
>   #define QSERDES_V3_COM_VCO_TUNE_TIMER1			0x11c
>   #define QSERDES_V3_COM_VCO_TUNE_TIMER2			0x120
>   #define QSERDES_V3_COM_CLK_SELECT			0x138
> @@ -211,8 +213,13 @@
>   /* Only for QMP V3 PHY - RX registers */
>   #define QSERDES_V3_RX_UCDR_SO_GAIN_HALF			0x00c
>   #define QSERDES_V3_RX_UCDR_SO_GAIN			0x014
> +#define QSERDES_V3_RX_UCDR_SVS_SO_GAIN_HALF		0x024
> +#define QSERDES_V3_RX_UCDR_SVS_SO_GAIN_QUARTER		0x028
> +#define QSERDES_V3_RX_UCDR_SVS_SO_GAIN			0x02c
>   #define QSERDES_V3_RX_UCDR_FASTLOCK_FO_GAIN		0x030
>   #define QSERDES_V3_RX_UCDR_SO_SATURATION_AND_ENABLE	0x034
> +#define QSERDES_V3_RX_UCDR_FASTLOCK_COUNT_LOW		0x03c
> +#define QSERDES_V3_RX_UCDR_PI_CONTROLS			0x044
>   #define QSERDES_V3_RX_RX_TERM_BW			0x07c
>   #define QSERDES_V3_RX_VGA_CAL_CNTRL1			0x0bc
>   #define QSERDES_V3_RX_VGA_CAL_CNTRL2			0x0c0
> @@ -275,6 +282,7 @@
>   #define QPHY_V3_PCS_FLL_CNT_VAL_L			0x0cc
>   #define QPHY_V3_PCS_FLL_CNT_VAL_H_TOL			0x0d0
>   #define QPHY_V3_PCS_FLL_MAN_CODE			0x0d4
> +#define QPHY_V3_PCS_MULTI_LANE_CTRL1			0x1c4
>   #define QPHY_V3_PCS_RX_SIGDET_LVL			0x1d8
>   #define QPHY_V3_PCS_REFGEN_REQ_CONFIG1			0x20c
>   #define QPHY_V3_PCS_REFGEN_REQ_CONFIG2			0x210