| Message ID | 1629847775-16767-1-git-send-email-khsieh@codeaurora.org |
|---|---|
| State | New |
| Headers | show |
| Series | phy: qcom-qmp: add support for voltage and pre emphesis swing | expand |
Quoting Kuogee Hsieh (2021-08-24 16:29:35) > Add voltage and pre emphesis swing tables so that voltage and Is it "pre-emphasis"? > pre emphsis swing level can be configured base on link rate. This one is also different. > > Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org> Presumably Fixes: aff188feb5e1 ("phy: qcom-qmp: add support for sm8250-usb3-dp phy") > --- > drivers/phy/qualcomm/phy-qcom-qmp.c | 95 ++++++++++++++++++++++++++++++++----- > 1 file changed, 82 insertions(+), 13 deletions(-) > > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c > index 31036aa..52bab6e 100644 > --- a/drivers/phy/qualcomm/phy-qcom-qmp.c > +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c > @@ -1916,7 +1916,7 @@ static const struct qmp_phy_init_tbl qmp_v4_dp_tx_tbl[] = { > QMP_PHY_INIT_CFG(QSERDES_V4_TX_RES_CODE_LANE_OFFSET_RX, 0x11), > QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_BAND, 0x4), > QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_POL_INV, 0x0a), > - QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_DRV_LVL, 0x2a), > + QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_DRV_LVL, 0x22), Is 0x22 the better "default"? Can that be described in the commit text? > QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_EMP_POST1_LVL, 0x20), > }; > > @@ -3727,6 +3727,81 @@ static int qcom_qmp_v3_dp_phy_calibrate(struct qmp_phy *qphy) > > return 0; > } Nitpick: Newline here please. > +/* > + * 0x20 deducted from tables > + * > + * swing_value |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN; > + * pre_emphasis_value |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN; > +*/ > +static const u8 qmp_dp_v4_pre_emphasis_hbr3_hbr2[4][4] = { > + /* p0 p1 p2 p3 */ > + { 0x00, 0x0c, 0x15, 0x1b }, /* s0 */ > + { 0x02, 0x0e, 0x16, 0xff }, /* s1 */ > + { 0x02, 0x11, 0xff, 0xff }, /* s2 */ > + { 0x04, 0xff, 0xff, 0xff } /* s3 */ > +}; > + > +static const u8 qmp_dp_v4_voltage_swing_hbr3_hbr2[4][4] = { This looks the same as qmp_dp_v3_voltage_swing_hbr3_hbr2. Can that be used? > + /* p0 p1 p2 p3 */ > + { 0x02, 0x12, 0x16, 0x1a }, /* s0 */ > + { 0x09, 0x19, 0x1f, 0xff }, /* s1 */ > + { 0x10, 0x1f, 0xff, 0xff }, /* s2 */ > + { 0x1f, 0xff, 0xff, 0xff } /* s3 */ > +}; > + > +static const u8 qmp_dp_v4_pre_emphasis_hbr_rbr[4][4] = { > + /* p0 p1 p2 p3 */ > + { 0x00, 0x0e, 0x15, 0x1b }, /* s0 */ > + { 0x00, 0x0e, 0x15, 0xff }, /* s1 */ > + { 0x00, 0x0e, 0xff, 0xff }, /* s2 */ > + { 0x04, 0xff, 0xff, 0xff } /* s3 */ > +}; > + > +static const u8 qmp_dp_v4_voltage_swing_hbr_rbr[4][4] = { > + /* p0 p1 p2 p3 */ > + { 0x08, 0x0f, 0x16, 0x1f }, /* s0 */ > + { 0x11, 0x1e, 0x1f, 0xff }, /* s1 */ > + { 0x16, 0x1f, 0xff, 0xff }, /* s2 */ > + { 0x1f, 0xff, 0xff, 0xff } /* s3 */ Do these comments add any value? Can we drop them? > +}; > + > +static int qcom_qmp_v4_phy_configure_dp_swing(struct qmp_phy *qphy, > + unsigned int drv_lvl_reg, unsigned int emp_post_reg) > +{ > + const struct phy_configure_opts_dp *dp_opts = &qphy->dp_opts; > + unsigned int v_level = 0, p_level = 0; > + u8 voltage_swing_cfg, pre_emphasis_cfg; > + int i; > + > + for (i = 0; i < dp_opts->lanes; i++) { > + v_level = max(v_level, dp_opts->voltage[i]); > + p_level = max(p_level, dp_opts->pre[i]); > + } > + > + Nitpick: Drop extra newline. > + if (dp_opts->link_rate <= 2700) { > + voltage_swing_cfg = qmp_dp_v4_voltage_swing_hbr_rbr[v_level][p_level]; > + pre_emphasis_cfg = qmp_dp_v4_pre_emphasis_hbr_rbr[v_level][p_level]; > + } else { > + voltage_swing_cfg = qmp_dp_v4_voltage_swing_hbr3_hbr2[v_level][p_level]; > + pre_emphasis_cfg = qmp_dp_v4_pre_emphasis_hbr3_hbr2[v_level][p_level]; > + } > + > + /* TODO: Move check to config check */ > + if (voltage_swing_cfg == 0xFF && pre_emphasis_cfg == 0xFF) > + return -EINVAL; > + > + /* Enable MUX to use Cursor values from these registers */ > + voltage_swing_cfg |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN; > + pre_emphasis_cfg |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN; > + > + writel(voltage_swing_cfg, qphy->tx + drv_lvl_reg); > + writel(pre_emphasis_cfg, qphy->tx + emp_post_reg); > + writel(voltage_swing_cfg, qphy->tx2 + drv_lvl_reg); > + writel(pre_emphasis_cfg, qphy->tx2 + emp_post_reg); This is copy/pasted from qcom_qmp_phy_configure_dp_swing() right? How about making a function static int __qcom_qmp_phy_configure_dp_swing(struct qmp_phy *qphy, unsigned int drv_lvl_reg, unsigned int emp_post_reg, const u8 **voltage_rbr_hbr, const u8 **pre_emphasis_rbr_hbr, const u8 **voltage_hbr3_hbr2, const u8 **pre_emphasis_hbr3_hbr2) that does the same stuff but allows the tables to be different. > + > + return 0; > +} > > static void qcom_qmp_v4_phy_dp_aux_init(struct qmp_phy *qphy) > { > @@ -3757,14 +3832,7 @@ static void qcom_qmp_v4_phy_dp_aux_init(struct qmp_phy *qphy) > > static void qcom_qmp_v4_phy_configure_dp_tx(struct qmp_phy *qphy) > { > - /* Program default values before writing proper values */ > - writel(0x27, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); > - writel(0x27, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); > - > - writel(0x20, qphy->tx + QSERDES_V4_TX_TX_EMP_POST1_LVL); > - writel(0x20, qphy->tx2 + QSERDES_V4_TX_TX_EMP_POST1_LVL); > - > - qcom_qmp_phy_configure_dp_swing(qphy, > + qcom_qmp_v4_phy_configure_dp_swing(qphy, > QSERDES_V4_TX_TX_DRV_LVL, > QSERDES_V4_TX_TX_EMP_POST1_LVL); > } > @@ -3885,6 +3953,9 @@ static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy) > writel(drvr1_en, qphy->tx2 + QSERDES_V4_TX_HIGHZ_DRVR_EN); > writel(bias1_en, qphy->tx2 + QSERDES_V4_TX_TRANSCEIVER_BIAS_EN); > > + writel(0x0a, qphy->tx + QSERDES_V4_TX_TX_POL_INV); > + writel(0x0a, qphy->tx2 + QSERDES_V4_TX_TX_POL_INV); Is this mentioned in the commit text? Is this fixing the sequence? It doesn't look like we're adding tables. > + > writel(0x18, qphy->pcs + QSERDES_DP_PHY_CFG); > udelay(2000); > writel(0x19, qphy->pcs + QSERDES_DP_PHY_CFG); > @@ -3896,11 +3967,9 @@ static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy) > 10000)) > return -ETIMEDOUT; > > - writel(0x0a, qphy->tx + QSERDES_V4_TX_TX_POL_INV); > - writel(0x0a, qphy->tx2 + QSERDES_V4_TX_TX_POL_INV); > > - writel(0x27, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); > - writel(0x27, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); > + writel(0x22, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); > + writel(0x22, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); > > writel(0x20, qphy->tx + QSERDES_V4_TX_TX_EMP_POST1_LVL); > writel(0x20, qphy->tx2 + QSERDES_V4_TX_TX_EMP_POST1_LVL);
On Tue 24 Aug 16:29 PDT 2021, Kuogee Hsieh wrote: > Add voltage and pre emphesis swing tables so that voltage and > pre emphsis swing level can be configured base on link rate. > I think it would be nice if $subject, or at least the commit message mentioned that this relates to the DisplayPort part of the QMP driver. Also the commit message states that this allows someone/something to configure the properties based on link rate. But it doesn't state why this is needed. > Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org> > --- > drivers/phy/qualcomm/phy-qcom-qmp.c | 95 ++++++++++++++++++++++++++++++++----- > 1 file changed, 82 insertions(+), 13 deletions(-) > > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c > index 31036aa..52bab6e 100644 > --- a/drivers/phy/qualcomm/phy-qcom-qmp.c > +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c > @@ -1916,7 +1916,7 @@ static const struct qmp_phy_init_tbl qmp_v4_dp_tx_tbl[] = { > QMP_PHY_INIT_CFG(QSERDES_V4_TX_RES_CODE_LANE_OFFSET_RX, 0x11), > QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_BAND, 0x4), > QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_POL_INV, 0x0a), > - QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_DRV_LVL, 0x2a), > + QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_DRV_LVL, 0x22), Why is this initial value changed in order to make the swing and emphasis configurable? > QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_EMP_POST1_LVL, 0x20), > }; > > @@ -3727,6 +3727,81 @@ static int qcom_qmp_v3_dp_phy_calibrate(struct qmp_phy *qphy) > > return 0; > } > +/* > + * 0x20 deducted from tables > + * > + * swing_value |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN; > + * pre_emphasis_value |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN; How about rewriting this as something like "The values in these tables are given without MUX_EN (0x20) bit set" ? > +*/ > +static const u8 qmp_dp_v4_pre_emphasis_hbr3_hbr2[4][4] = { > + /* p0 p1 p2 p3 */ > + { 0x00, 0x0c, 0x15, 0x1b }, /* s0 */ > + { 0x02, 0x0e, 0x16, 0xff }, /* s1 */ > + { 0x02, 0x11, 0xff, 0xff }, /* s2 */ > + { 0x04, 0xff, 0xff, 0xff } /* s3 */ > +}; > + > +static const u8 qmp_dp_v4_voltage_swing_hbr3_hbr2[4][4] = { > + /* p0 p1 p2 p3 */ > + { 0x02, 0x12, 0x16, 0x1a }, /* s0 */ > + { 0x09, 0x19, 0x1f, 0xff }, /* s1 */ > + { 0x10, 0x1f, 0xff, 0xff }, /* s2 */ > + { 0x1f, 0xff, 0xff, 0xff } /* s3 */ > +}; > + > +static const u8 qmp_dp_v4_pre_emphasis_hbr_rbr[4][4] = { > + /* p0 p1 p2 p3 */ > + { 0x00, 0x0e, 0x15, 0x1b }, /* s0 */ > + { 0x00, 0x0e, 0x15, 0xff }, /* s1 */ > + { 0x00, 0x0e, 0xff, 0xff }, /* s2 */ > + { 0x04, 0xff, 0xff, 0xff } /* s3 */ > +}; > + > +static const u8 qmp_dp_v4_voltage_swing_hbr_rbr[4][4] = { > + /* p0 p1 p2 p3 */ > + { 0x08, 0x0f, 0x16, 0x1f }, /* s0 */ > + { 0x11, 0x1e, 0x1f, 0xff }, /* s1 */ > + { 0x16, 0x1f, 0xff, 0xff }, /* s2 */ > + { 0x1f, 0xff, 0xff, 0xff } /* s3 */ > +}; > + > +static int qcom_qmp_v4_phy_configure_dp_swing(struct qmp_phy *qphy, > + unsigned int drv_lvl_reg, unsigned int emp_post_reg) > +{ > + const struct phy_configure_opts_dp *dp_opts = &qphy->dp_opts; > + unsigned int v_level = 0, p_level = 0; > + u8 voltage_swing_cfg, pre_emphasis_cfg; The "_cfg" suffix on these variables doesn't really add any value. Frankly, calling them "voltage" (or "swing") and "emphasis" seems just as expressive, but easier to read. > + int i; > + > + for (i = 0; i < dp_opts->lanes; i++) { > + v_level = max(v_level, dp_opts->voltage[i]); > + p_level = max(p_level, dp_opts->pre[i]); > + } > + > + > + if (dp_opts->link_rate <= 2700) { > + voltage_swing_cfg = qmp_dp_v4_voltage_swing_hbr_rbr[v_level][p_level]; > + pre_emphasis_cfg = qmp_dp_v4_pre_emphasis_hbr_rbr[v_level][p_level]; > + } else { > + voltage_swing_cfg = qmp_dp_v4_voltage_swing_hbr3_hbr2[v_level][p_level]; > + pre_emphasis_cfg = qmp_dp_v4_pre_emphasis_hbr3_hbr2[v_level][p_level]; > + } > + > + /* TODO: Move check to config check */ > + if (voltage_swing_cfg == 0xFF && pre_emphasis_cfg == 0xFF) Why is this && and not || ? > + return -EINVAL; > + > + /* Enable MUX to use Cursor values from these registers */ > + voltage_swing_cfg |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN; > + pre_emphasis_cfg |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN; > + > + writel(voltage_swing_cfg, qphy->tx + drv_lvl_reg); > + writel(pre_emphasis_cfg, qphy->tx + emp_post_reg); > + writel(voltage_swing_cfg, qphy->tx2 + drv_lvl_reg); > + writel(pre_emphasis_cfg, qphy->tx2 + emp_post_reg); > + This function is called once, so why is drv_lvl_reg and emp_post_reg variables passed to the function, rather than just using the defines directly? Regards, Bjorn > + return 0; > +} > > static void qcom_qmp_v4_phy_dp_aux_init(struct qmp_phy *qphy) > { > @@ -3757,14 +3832,7 @@ static void qcom_qmp_v4_phy_dp_aux_init(struct qmp_phy *qphy) > > static void qcom_qmp_v4_phy_configure_dp_tx(struct qmp_phy *qphy) > { > - /* Program default values before writing proper values */ > - writel(0x27, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); > - writel(0x27, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); > - > - writel(0x20, qphy->tx + QSERDES_V4_TX_TX_EMP_POST1_LVL); > - writel(0x20, qphy->tx2 + QSERDES_V4_TX_TX_EMP_POST1_LVL); > - > - qcom_qmp_phy_configure_dp_swing(qphy, > + qcom_qmp_v4_phy_configure_dp_swing(qphy, > QSERDES_V4_TX_TX_DRV_LVL, > QSERDES_V4_TX_TX_EMP_POST1_LVL); > } > @@ -3885,6 +3953,9 @@ static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy) > writel(drvr1_en, qphy->tx2 + QSERDES_V4_TX_HIGHZ_DRVR_EN); > writel(bias1_en, qphy->tx2 + QSERDES_V4_TX_TRANSCEIVER_BIAS_EN); > > + writel(0x0a, qphy->tx + QSERDES_V4_TX_TX_POL_INV); > + writel(0x0a, qphy->tx2 + QSERDES_V4_TX_TX_POL_INV); > + > writel(0x18, qphy->pcs + QSERDES_DP_PHY_CFG); > udelay(2000); > writel(0x19, qphy->pcs + QSERDES_DP_PHY_CFG); > @@ -3896,11 +3967,9 @@ static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy) > 10000)) > return -ETIMEDOUT; > > - writel(0x0a, qphy->tx + QSERDES_V4_TX_TX_POL_INV); > - writel(0x0a, qphy->tx2 + QSERDES_V4_TX_TX_POL_INV); > > - writel(0x27, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); > - writel(0x27, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); > + writel(0x22, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); > + writel(0x22, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); > > writel(0x20, qphy->tx + QSERDES_V4_TX_TX_EMP_POST1_LVL); > writel(0x20, qphy->tx2 + QSERDES_V4_TX_TX_EMP_POST1_LVL); > -- > The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, > a Linux Foundation Collaborative Project >
On 2021-08-25 10:49, Stephen Boyd wrote: > Quoting Kuogee Hsieh (2021-08-24 16:29:35) >> Add voltage and pre emphesis swing tables so that voltage and > > Is it "pre-emphasis"? > >> pre emphsis swing level can be configured base on link rate. > > This one is also different. > >> >> Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org> > > Presumably > > Fixes: aff188feb5e1 ("phy: qcom-qmp: add support for sm8250-usb3-dp > phy") > >> --- >> drivers/phy/qualcomm/phy-qcom-qmp.c | 95 >> ++++++++++++++++++++++++++++++++----- >> 1 file changed, 82 insertions(+), 13 deletions(-) >> >> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c >> b/drivers/phy/qualcomm/phy-qcom-qmp.c >> index 31036aa..52bab6e 100644 >> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c >> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c >> @@ -1916,7 +1916,7 @@ static const struct qmp_phy_init_tbl >> qmp_v4_dp_tx_tbl[] = { >> QMP_PHY_INIT_CFG(QSERDES_V4_TX_RES_CODE_LANE_OFFSET_RX, 0x11), >> QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_BAND, 0x4), >> QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_POL_INV, 0x0a), >> - QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_DRV_LVL, 0x2a), >> + QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_DRV_LVL, 0x22), > > Is 0x22 the better "default"? Can that be described in the commit text? > >> QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_EMP_POST1_LVL, 0x20), >> }; >> >> @@ -3727,6 +3727,81 @@ static int qcom_qmp_v3_dp_phy_calibrate(struct >> qmp_phy *qphy) >> >> return 0; >> } > > Nitpick: Newline here please. > >> +/* >> + * 0x20 deducted from tables >> + * >> + * swing_value |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN; >> + * pre_emphasis_value |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN; >> +*/ >> +static const u8 qmp_dp_v4_pre_emphasis_hbr3_hbr2[4][4] = { >> + /* p0 p1 p2 p3 */ >> + { 0x00, 0x0c, 0x15, 0x1b }, /* s0 */ >> + { 0x02, 0x0e, 0x16, 0xff }, /* s1 */ >> + { 0x02, 0x11, 0xff, 0xff }, /* s2 */ >> + { 0x04, 0xff, 0xff, 0xff } /* s3 */ >> +}; >> + >> +static const u8 qmp_dp_v4_voltage_swing_hbr3_hbr2[4][4] = { > > This looks the same as qmp_dp_v3_voltage_swing_hbr3_hbr2. Can that be > used? to avoid confuse, i like to keep them separated. > >> + /* p0 p1 p2 p3 */ >> + { 0x02, 0x12, 0x16, 0x1a }, /* s0 */ >> + { 0x09, 0x19, 0x1f, 0xff }, /* s1 */ >> + { 0x10, 0x1f, 0xff, 0xff }, /* s2 */ >> + { 0x1f, 0xff, 0xff, 0xff } /* s3 */ >> +}; >> + >> +static const u8 qmp_dp_v4_pre_emphasis_hbr_rbr[4][4] = { >> + /* p0 p1 p2 p3 */ >> + { 0x00, 0x0e, 0x15, 0x1b }, /* s0 */ >> + { 0x00, 0x0e, 0x15, 0xff }, /* s1 */ >> + { 0x00, 0x0e, 0xff, 0xff }, /* s2 */ >> + { 0x04, 0xff, 0xff, 0xff } /* s3 */ >> +}; >> + >> +static const u8 qmp_dp_v4_voltage_swing_hbr_rbr[4][4] = { >> + /* p0 p1 p2 p3 */ >> + { 0x08, 0x0f, 0x16, 0x1f }, /* s0 */ >> + { 0x11, 0x1e, 0x1f, 0xff }, /* s1 */ >> + { 0x16, 0x1f, 0xff, 0xff }, /* s2 */ >> + { 0x1f, 0xff, 0xff, 0xff } /* s3 */ > > Do these comments add any value? Can we drop them? > >> +}; >> + >> +static int qcom_qmp_v4_phy_configure_dp_swing(struct qmp_phy *qphy, >> + unsigned int drv_lvl_reg, unsigned int emp_post_reg) >> +{ >> + const struct phy_configure_opts_dp *dp_opts = &qphy->dp_opts; >> + unsigned int v_level = 0, p_level = 0; >> + u8 voltage_swing_cfg, pre_emphasis_cfg; >> + int i; >> + >> + for (i = 0; i < dp_opts->lanes; i++) { >> + v_level = max(v_level, dp_opts->voltage[i]); >> + p_level = max(p_level, dp_opts->pre[i]); >> + } >> + >> + > > Nitpick: Drop extra newline. > >> + if (dp_opts->link_rate <= 2700) { >> + voltage_swing_cfg = >> qmp_dp_v4_voltage_swing_hbr_rbr[v_level][p_level]; >> + pre_emphasis_cfg = >> qmp_dp_v4_pre_emphasis_hbr_rbr[v_level][p_level]; >> + } else { >> + voltage_swing_cfg = >> qmp_dp_v4_voltage_swing_hbr3_hbr2[v_level][p_level]; >> + pre_emphasis_cfg = >> qmp_dp_v4_pre_emphasis_hbr3_hbr2[v_level][p_level]; >> + } >> + >> + /* TODO: Move check to config check */ >> + if (voltage_swing_cfg == 0xFF && pre_emphasis_cfg == 0xFF) >> + return -EINVAL; >> + >> + /* Enable MUX to use Cursor values from these registers */ >> + voltage_swing_cfg |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN; >> + pre_emphasis_cfg |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN; >> + >> + writel(voltage_swing_cfg, qphy->tx + drv_lvl_reg); >> + writel(pre_emphasis_cfg, qphy->tx + emp_post_reg); >> + writel(voltage_swing_cfg, qphy->tx2 + drv_lvl_reg); >> + writel(pre_emphasis_cfg, qphy->tx2 + emp_post_reg); > > This is copy/pasted from qcom_qmp_phy_configure_dp_swing() right? How > about making a function > > static int > __qcom_qmp_phy_configure_dp_swing(struct qmp_phy *qphy, > unsigned int drv_lvl_reg, > unsigned int emp_post_reg, > const u8 **voltage_rbr_hbr, > const u8 **pre_emphasis_rbr_hbr, > const u8 **voltage_hbr3_hbr2, > const u8 **pre_emphasis_hbr3_hbr2) > > that does the same stuff but allows the tables to be different. > >> + >> + return 0; >> +} >> >> static void qcom_qmp_v4_phy_dp_aux_init(struct qmp_phy *qphy) >> { >> @@ -3757,14 +3832,7 @@ static void qcom_qmp_v4_phy_dp_aux_init(struct >> qmp_phy *qphy) >> >> static void qcom_qmp_v4_phy_configure_dp_tx(struct qmp_phy *qphy) >> { >> - /* Program default values before writing proper values */ >> - writel(0x27, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); >> - writel(0x27, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); >> - >> - writel(0x20, qphy->tx + QSERDES_V4_TX_TX_EMP_POST1_LVL); >> - writel(0x20, qphy->tx2 + QSERDES_V4_TX_TX_EMP_POST1_LVL); >> - >> - qcom_qmp_phy_configure_dp_swing(qphy, >> + qcom_qmp_v4_phy_configure_dp_swing(qphy, >> QSERDES_V4_TX_TX_DRV_LVL, >> QSERDES_V4_TX_TX_EMP_POST1_LVL); >> } >> @@ -3885,6 +3953,9 @@ static int >> qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy) >> writel(drvr1_en, qphy->tx2 + QSERDES_V4_TX_HIGHZ_DRVR_EN); >> writel(bias1_en, qphy->tx2 + >> QSERDES_V4_TX_TRANSCEIVER_BIAS_EN); >> >> + writel(0x0a, qphy->tx + QSERDES_V4_TX_TX_POL_INV); >> + writel(0x0a, qphy->tx2 + QSERDES_V4_TX_TX_POL_INV); > > Is this mentioned in the commit text? Is this fixing the sequence? > It doesn't look like we're adding tables. add these since they are missed from HPG sequence. > >> + >> writel(0x18, qphy->pcs + QSERDES_DP_PHY_CFG); >> udelay(2000); >> writel(0x19, qphy->pcs + QSERDES_DP_PHY_CFG); >> @@ -3896,11 +3967,9 @@ static int >> qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy) >> 10000)) >> return -ETIMEDOUT; >> >> - writel(0x0a, qphy->tx + QSERDES_V4_TX_TX_POL_INV); >> - writel(0x0a, qphy->tx2 + QSERDES_V4_TX_TX_POL_INV); >> >> - writel(0x27, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); >> - writel(0x27, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); >> + writel(0x22, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); >> + writel(0x22, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); >> >> writel(0x20, qphy->tx + QSERDES_V4_TX_TX_EMP_POST1_LVL); >> writel(0x20, qphy->tx2 + QSERDES_V4_TX_TX_EMP_POST1_LVL);
diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c index 31036aa..52bab6e 100644 --- a/drivers/phy/qualcomm/phy-qcom-qmp.c +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c @@ -1916,7 +1916,7 @@ static const struct qmp_phy_init_tbl qmp_v4_dp_tx_tbl[] = { QMP_PHY_INIT_CFG(QSERDES_V4_TX_RES_CODE_LANE_OFFSET_RX, 0x11), QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_BAND, 0x4), QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_POL_INV, 0x0a), - QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_DRV_LVL, 0x2a), + QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_DRV_LVL, 0x22), QMP_PHY_INIT_CFG(QSERDES_V4_TX_TX_EMP_POST1_LVL, 0x20), }; @@ -3727,6 +3727,81 @@ static int qcom_qmp_v3_dp_phy_calibrate(struct qmp_phy *qphy) return 0; } +/* + * 0x20 deducted from tables + * + * swing_value |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN; + * pre_emphasis_value |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN; +*/ +static const u8 qmp_dp_v4_pre_emphasis_hbr3_hbr2[4][4] = { + /* p0 p1 p2 p3 */ + { 0x00, 0x0c, 0x15, 0x1b }, /* s0 */ + { 0x02, 0x0e, 0x16, 0xff }, /* s1 */ + { 0x02, 0x11, 0xff, 0xff }, /* s2 */ + { 0x04, 0xff, 0xff, 0xff } /* s3 */ +}; + +static const u8 qmp_dp_v4_voltage_swing_hbr3_hbr2[4][4] = { + /* p0 p1 p2 p3 */ + { 0x02, 0x12, 0x16, 0x1a }, /* s0 */ + { 0x09, 0x19, 0x1f, 0xff }, /* s1 */ + { 0x10, 0x1f, 0xff, 0xff }, /* s2 */ + { 0x1f, 0xff, 0xff, 0xff } /* s3 */ +}; + +static const u8 qmp_dp_v4_pre_emphasis_hbr_rbr[4][4] = { + /* p0 p1 p2 p3 */ + { 0x00, 0x0e, 0x15, 0x1b }, /* s0 */ + { 0x00, 0x0e, 0x15, 0xff }, /* s1 */ + { 0x00, 0x0e, 0xff, 0xff }, /* s2 */ + { 0x04, 0xff, 0xff, 0xff } /* s3 */ +}; + +static const u8 qmp_dp_v4_voltage_swing_hbr_rbr[4][4] = { + /* p0 p1 p2 p3 */ + { 0x08, 0x0f, 0x16, 0x1f }, /* s0 */ + { 0x11, 0x1e, 0x1f, 0xff }, /* s1 */ + { 0x16, 0x1f, 0xff, 0xff }, /* s2 */ + { 0x1f, 0xff, 0xff, 0xff } /* s3 */ +}; + +static int qcom_qmp_v4_phy_configure_dp_swing(struct qmp_phy *qphy, + unsigned int drv_lvl_reg, unsigned int emp_post_reg) +{ + const struct phy_configure_opts_dp *dp_opts = &qphy->dp_opts; + unsigned int v_level = 0, p_level = 0; + u8 voltage_swing_cfg, pre_emphasis_cfg; + int i; + + for (i = 0; i < dp_opts->lanes; i++) { + v_level = max(v_level, dp_opts->voltage[i]); + p_level = max(p_level, dp_opts->pre[i]); + } + + + if (dp_opts->link_rate <= 2700) { + voltage_swing_cfg = qmp_dp_v4_voltage_swing_hbr_rbr[v_level][p_level]; + pre_emphasis_cfg = qmp_dp_v4_pre_emphasis_hbr_rbr[v_level][p_level]; + } else { + voltage_swing_cfg = qmp_dp_v4_voltage_swing_hbr3_hbr2[v_level][p_level]; + pre_emphasis_cfg = qmp_dp_v4_pre_emphasis_hbr3_hbr2[v_level][p_level]; + } + + /* TODO: Move check to config check */ + if (voltage_swing_cfg == 0xFF && pre_emphasis_cfg == 0xFF) + return -EINVAL; + + /* Enable MUX to use Cursor values from these registers */ + voltage_swing_cfg |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN; + pre_emphasis_cfg |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN; + + writel(voltage_swing_cfg, qphy->tx + drv_lvl_reg); + writel(pre_emphasis_cfg, qphy->tx + emp_post_reg); + writel(voltage_swing_cfg, qphy->tx2 + drv_lvl_reg); + writel(pre_emphasis_cfg, qphy->tx2 + emp_post_reg); + + return 0; +} static void qcom_qmp_v4_phy_dp_aux_init(struct qmp_phy *qphy) { @@ -3757,14 +3832,7 @@ static void qcom_qmp_v4_phy_dp_aux_init(struct qmp_phy *qphy) static void qcom_qmp_v4_phy_configure_dp_tx(struct qmp_phy *qphy) { - /* Program default values before writing proper values */ - writel(0x27, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); - writel(0x27, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); - - writel(0x20, qphy->tx + QSERDES_V4_TX_TX_EMP_POST1_LVL); - writel(0x20, qphy->tx2 + QSERDES_V4_TX_TX_EMP_POST1_LVL); - - qcom_qmp_phy_configure_dp_swing(qphy, + qcom_qmp_v4_phy_configure_dp_swing(qphy, QSERDES_V4_TX_TX_DRV_LVL, QSERDES_V4_TX_TX_EMP_POST1_LVL); } @@ -3885,6 +3953,9 @@ static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy) writel(drvr1_en, qphy->tx2 + QSERDES_V4_TX_HIGHZ_DRVR_EN); writel(bias1_en, qphy->tx2 + QSERDES_V4_TX_TRANSCEIVER_BIAS_EN); + writel(0x0a, qphy->tx + QSERDES_V4_TX_TX_POL_INV); + writel(0x0a, qphy->tx2 + QSERDES_V4_TX_TX_POL_INV); + writel(0x18, qphy->pcs + QSERDES_DP_PHY_CFG); udelay(2000); writel(0x19, qphy->pcs + QSERDES_DP_PHY_CFG); @@ -3896,11 +3967,9 @@ static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy) 10000)) return -ETIMEDOUT; - writel(0x0a, qphy->tx + QSERDES_V4_TX_TX_POL_INV); - writel(0x0a, qphy->tx2 + QSERDES_V4_TX_TX_POL_INV); - writel(0x27, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); - writel(0x27, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); + writel(0x22, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL); + writel(0x22, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL); writel(0x20, qphy->tx + QSERDES_V4_TX_TX_EMP_POST1_LVL); writel(0x20, qphy->tx2 + QSERDES_V4_TX_TX_EMP_POST1_LVL);
Add voltage and pre emphesis swing tables so that voltage and pre emphsis swing level can be configured base on link rate. Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org> --- drivers/phy/qualcomm/phy-qcom-qmp.c | 95 ++++++++++++++++++++++++++++++++----- 1 file changed, 82 insertions(+), 13 deletions(-)