linux-kernel - Re: [PATCH v3 1/2] phy: Add QMP phy based UFS phy support for sdm845

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Date:   Thu, 12 Apr 2018 10:43:26 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     cang@...eaurora.org
Cc:     subhashj@...eaurora.org, asutoshd@...eaurora.org,
        mgautam@...eaurora.org, kishon@...com, robh+dt@...nel.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/2] phy: Add QMP phy based UFS phy support for sdm845



On 4/12/2018 6:27 AM, cang@...eaurora.org wrote:
> On 2018-04-09 19:28, Vivek Gautam wrote:
>> Hi Can,
>>
>>
>> On 3/27/2018 12:48 PM, Can Guo wrote:
>>> Add UFS PHY support to make SDM845 UFS work with common PHY framework.
>>>
>>> Signed-off-by: Can Guo <cang@...eaurora.org>
>>> ---
>>>   drivers/phy/qualcomm/phy-qcom-qmp.c | 130 
>>> +++++++++++++++++++++++++++++++++---
>>>   drivers/phy/qualcomm/phy-qcom-qmp.h |   8 +++
>>>   2 files changed, 127 insertions(+), 11 deletions(-)
>>>
>>> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c 
>>> b/drivers/phy/qualcomm/phy-qcom-qmp.c
>>> index 5cf2c3c..0b58030 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 no separate SW_RESET register */
>>> +    bool skip_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",
>>
>> did you miss adding 'ref_aux' clock here as in the v2 version?
>> Rest looks good. After this change, you can add my reviewed-by
>> Reviewed-by: Vivek Gautam <vivek.gautam@...eaurora.org>
>>
>> Thanks
>> Vivek
>
> Thank you Vivek. I removed 'ref_aux' as it was from the old UFS PHY 
> driver.
> And I have tested the new patch on MTP845 V2, it worked fine. Do you have
> any concerns about it?
>

I see in the downstream there's a ref_aux clock, so can you check from 
the phy's
hardware docs if this is required for phy's functionality. Working on 
the MTP is
one thing as some of the clocks may be kept enabled by the bootloader 
too sometimes.

Thanks
Vivek
> Thanks
> Can
[snip]