Re: [PATCH 5/9] phy: qcom-qmp: use correct values for ipq8074 gen2 pcie phy init

Vinod Koul
2020-07-13T05:56:05Z

On 05-07-20, 14:47, Sivaprakash Murugesan wrote:
> There were some problem in ipq8074 gen2 pcie phy init sequence, fix

Can you please describe these problems, it would help review to
understand the issues and also for future reference to you

> these to make gen2 pcie port on ipq8074 to work.
>
> Fixes: eef243d04b2b6 ("phy: qcom-qmp: Add support for IPQ8074")
>
> Cc: stable@vger.kernel.org
> Co-developed-by: Selvam Sathappan Periakaruppan <speriaka@codeaurora.org>
> Signed-off-by: Selvam Sathappan Periakaruppan <speriaka@codeaurora.org>
> Signed-off-by: Sivaprakash Murugesan <sivaprak@codeaurora.org>
> ---
> drivers/phy/qualcomm/phy-qcom-qmp.c | 16 +++++++++-------
> drivers/phy/qualcomm/phy-qcom-qmp.h | 2 ++
> 2 files changed, 11 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index e91040af3394..ba277136f52b 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -504,8 +504,8 @@ static const struct qmp_phy_init_tbl ipq8074_pcie_serdes_tbl[] = {
> QMP_PHY_INIT_CFG(QSERDES_COM_BG_TRIM, 0xf),
> QMP_PHY_INIT_CFG(QSERDES_COM_LOCK_CMP_EN, 0x1),
> QMP_PHY_INIT_CFG(QSERDES_COM_VCO_TUNE_MAP, 0x0),
> - QMP_PHY_INIT_CFG(QSERDES_COM_VCO_TUNE_TIMER1, 0x1f),
> - QMP_PHY_INIT_CFG(QSERDES_COM_VCO_TUNE_TIMER2, 0x3f),
> + QMP_PHY_INIT_CFG(QSERDES_COM_VCO_TUNE_TIMER1, 0xff),
> + QMP_PHY_INIT_CFG(QSERDES_COM_VCO_TUNE_TIMER2, 0x1f),
> QMP_PHY_INIT_CFG(QSERDES_COM_CMN_CONFIG, 0x6),
> QMP_PHY_INIT_CFG(QSERDES_COM_PLL_IVCO, 0xf),
> QMP_PHY_INIT_CFG(QSERDES_COM_HSCLK_SEL, 0x0),
> @@ -531,7 +531,6 @@ static const struct qmp_phy_init_tbl ipq8074_pcie_serdes_tbl[] = {
> QMP_PHY_INIT_CFG(QSERDES_COM_INTEGLOOP_GAIN1_MODE0, 0x0),
> QMP_PHY_INIT_CFG(QSERDES_COM_INTEGLOOP_GAIN0_MODE0, 0x80),
> QMP_PHY_INIT_CFG(QSERDES_COM_BIAS_EN_CTRL_BY_PSM, 0x1),
> - QMP_PHY_INIT_CFG(QSERDES_COM_VCO_TUNE_CTRL, 0xa),
> QMP_PHY_INIT_CFG(QSERDES_COM_SSC_EN_CENTER, 0x1),
> QMP_PHY_INIT_CFG(QSERDES_COM_SSC_PER1, 0x31),
> QMP_PHY_INIT_CFG(QSERDES_COM_SSC_PER2, 0x1),
> @@ -540,7 +539,6 @@ static const struct qmp_phy_init_tbl ipq8074_pcie_serdes_tbl[] = {
> QMP_PHY_INIT_CFG(QSERDES_COM_SSC_STEP_SIZE1, 0x2f),
> QMP_PHY_INIT_CFG(QSERDES_COM_SSC_STEP_SIZE2, 0x19),
> QMP_PHY_INIT_CFG(QSERDES_COM_CLK_EP_DIV, 0x19),
> - QMP_PHY_INIT_CFG(QSERDES_RX_SIGDET_CNTRL, 0x7),
> };
>
> static const struct qmp_phy_init_tbl ipq8074_pcie_tx_tbl[] = {
> @@ -548,6 +546,8 @@ static const struct qmp_phy_init_tbl ipq8074_pcie_tx_tbl[] = {
> QMP_PHY_INIT_CFG(QSERDES_TX_LANE_MODE, 0x6),
> QMP_PHY_INIT_CFG(QSERDES_TX_RES_CODE_LANE_OFFSET, 0x2),
> QMP_PHY_INIT_CFG(QSERDES_TX_RCV_DETECT_LVL_2, 0x12),
> + QMP_PHY_INIT_CFG(QSERDES_TX_EMP_POST1_LVL, 0x36),
> + QMP_PHY_INIT_CFG(QSERDES_TX_SLEW_CNTL, 0x0a),
> };
>
> static const struct qmp_phy_init_tbl ipq8074_pcie_rx_tbl[] = {
> @@ -558,7 +558,6 @@ static const struct qmp_phy_init_tbl ipq8074_pcie_rx_tbl[] = {
> QMP_PHY_INIT_CFG(QSERDES_RX_RX_EQU_ADAPTOR_CNTRL4, 0xdb),
> QMP_PHY_INIT_CFG(QSERDES_RX_UCDR_SO_SATURATION_AND_ENABLE, 0x4b),
> QMP_PHY_INIT_CFG(QSERDES_RX_UCDR_SO_GAIN, 0x4),
> - QMP_PHY_INIT_CFG(QSERDES_RX_UCDR_SO_GAIN_HALF, 0x4),
> };
>
> static const struct qmp_phy_init_tbl ipq8074_pcie_pcs_tbl[] = {
> @@ -1673,6 +1672,9 @@ static const struct qmp_phy_cfg msm8996_usb3phy_cfg = {
> .pwrdn_ctrl = SW_PWRDN,
> };
>
> +static const char * const ipq8074_pciephy_clk_l[] = {
> + "aux", "cfg_ahb",
> +};
> /* list of resets */
> static const char * const ipq8074_pciephy_reset_l[] = {
> "phy", "common",
> @@ -1690,8 +1692,8 @@ static const struct qmp_phy_cfg ipq8074_pciephy_cfg = {
> .rx_tbl_num = ARRAY_SIZE(ipq8074_pcie_rx_tbl),
> .pcs_tbl = ipq8074_pcie_pcs_tbl,
> .pcs_tbl_num = ARRAY_SIZE(ipq8074_pcie_pcs_tbl),
> - .clk_list = NULL,
> - .num_clks = 0,
> + .clk_list = ipq8074_pciephy_clk_l,
> + .num_clks = ARRAY_SIZE(ipq8074_pciephy_clk_l),

I see patch is modifying some register values and then adding clks, in
the absence of proper patch description it is extremely hard to
understand what is going on..

> .reset_list = ipq8074_pciephy_reset_l,
> .num_resets = ARRAY_SIZE(ipq8074_pciephy_reset_l),
> .vreg_list = NULL,
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.h b/drivers/phy/qualcomm/phy-qcom-qmp.h
> index 6d017a0c0c8d..832b3d098403 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.h
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.h
> @@ -77,6 +77,8 @@
> #define QSERDES_COM_CORECLK_DIV_MODE1 0x1bc
>
> /* Only for QMP V2 PHY - TX registers */
> +#define QSERDES_TX_EMP_POST1_LVL 0x018
> +#define QSERDES_TX_SLEW_CNTL 0x040
> #define QSERDES_TX_RES_CODE_LANE_OFFSET 0x054
> #define QSERDES_TX_DEBUG_BUS_SEL 0x064
> #define QSERDES_TX_HIGHZ_TRANSCEIVEREN_BIAS_DRVR_EN 0x068
> --
> 2.7.4

--
~Vinod