* [PATCH v3] phy: qcom-qmp: add support for display port voltage and pre-emphasis swing
@ 2021-09-09 21:31 Kuogee Hsieh
2021-09-13 20:06 ` Stephen Boyd
0 siblings, 1 reply; 2+ messages in thread
From: Kuogee Hsieh @ 2021-09-09 21:31 UTC (permalink / raw)
To: robdclark, sean, swboyd, vkoul, agross, bjorn.andersson, robh+dt,
devicetree
Cc: abhinavk, aravindh, khsieh, freedreno, linux-arm-msm,
linux-kernel, kishon, p.zabel
Both voltage and pre-emphasis swing level are set during link training
negotiation between host and sink. There are totally four tables added.
A voltage swing table for both hbr and hbr1, a voltage table for both
hbr2 and hbr3, a pre-emphasis table for both hbr and hbr1 and a pre-emphasis
table for both hbr2 and hbr3. In addition, write 0x0a to TX_TX_POL_INV is
added to complete the sequence of configure dp phy base on HPG.
Chnages in v2:
-- revise commit test
-- add Fixes tag
-- replaced voltage_swing_cfg with voltage
-- replaced pre_emphasis_cfg with emphasis
-- delete drv_lvl_reg and emp_post_reg parameters from qcom_qmp_v4_phy_configure_dp_swing()
-- delete drv_lvl_reg and emp_post_reg parameters from qcom_qmp_phy_configure_dp_swing()
Changes in V3:
-- add __qcom_qmp_phy_configure_dp_swing() to commit swing/pre-emphasis level
Fixes: aff188feb5e1 ("phy: qcom-qmp: add support for sm8250-usb3-dp phy")
Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
---
drivers/phy/qualcomm/phy-qcom-qmp.c | 102 +++++++++++++++++++++++++-----------
1 file changed, 70 insertions(+), 32 deletions(-)
diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 31036aa..a8097ee 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -3546,40 +3546,46 @@ static const u8 qmp_dp_v3_voltage_swing_hbr_rbr[4][4] = {
{ 0x1f, 0xff, 0xff, 0xff }
};
-static int qcom_qmp_phy_configure_dp_swing(struct qmp_phy *qphy,
- unsigned int drv_lvl_reg, unsigned int emp_post_reg)
+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_swing_hbr_rbr,
+ const u8 *pre_emphasis_hbr_rbr,
+ const u8 *voltage_swing_hbr3_hbr2,
+ const u8 *pre_emphasis_hbr3_hbr2)
{
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;
+ u8 voltage, emphasis;
+ int i, offset;
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]);
}
+ offset = v_level * 4 + p_level;
+
if (dp_opts->link_rate <= 2700) {
- voltage_swing_cfg = qmp_dp_v3_voltage_swing_hbr_rbr[v_level][p_level];
- pre_emphasis_cfg = qmp_dp_v3_pre_emphasis_hbr_rbr[v_level][p_level];
+ voltage = *(voltage_swing_hbr_rbr + offset);
+ emphasis = *(pre_emphasis_hbr_rbr + offset);
} else {
- voltage_swing_cfg = qmp_dp_v3_voltage_swing_hbr3_hbr2[v_level][p_level];
- pre_emphasis_cfg = qmp_dp_v3_pre_emphasis_hbr3_hbr2[v_level][p_level];
+ voltage = *(voltage_swing_hbr3_hbr2 + offset);
+ emphasis = *(pre_emphasis_hbr3_hbr2 + offset);
}
/* TODO: Move check to config check */
- if (voltage_swing_cfg == 0xFF && pre_emphasis_cfg == 0xFF)
+ if (voltage == 0xFF && emphasis == 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);
+ voltage |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN;
+ emphasis |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN;
+ writel(voltage, qphy->tx + drv_lvl_reg);
+ writel(emphasis, qphy->tx + emp_post_reg);
+ writel(voltage, qphy->tx2 + drv_lvl_reg);
+ writel(emphasis, qphy->tx2 + emp_post_reg);
return 0;
}
@@ -3588,9 +3594,13 @@ static void qcom_qmp_v3_phy_configure_dp_tx(struct qmp_phy *qphy)
const struct phy_configure_opts_dp *dp_opts = &qphy->dp_opts;
u32 bias_en, drvr_en;
- if (qcom_qmp_phy_configure_dp_swing(qphy,
- QSERDES_V3_TX_TX_DRV_LVL,
- QSERDES_V3_TX_TX_EMP_POST1_LVL) < 0)
+ if (__qcom_qmp_phy_configure_dp_swing(qphy,
+ QSERDES_V3_TX_TX_DRV_LVL,
+ QSERDES_V3_TX_TX_EMP_POST1_LVL,
+ (const u8 *)qmp_dp_v3_voltage_swing_hbr_rbr,
+ (const u8 *)qmp_dp_v3_pre_emphasis_hbr_rbr,
+ (const u8 *)qmp_dp_v3_voltage_swing_hbr3_hbr2,
+ (const u8 *)qmp_dp_v3_pre_emphasis_hbr3_hbr2) < 0)
return;
if (dp_opts->lanes == 1) {
@@ -3728,6 +3738,35 @@ static int qcom_qmp_v3_dp_phy_calibrate(struct qmp_phy *qphy)
return 0;
}
+/* 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] = {
+ { 0x00, 0x0c, 0x15, 0x1b },
+ { 0x02, 0x0e, 0x16, 0xff },
+ { 0x02, 0x11, 0xff, 0xff },
+ { 0x04, 0xff, 0xff, 0xff }
+};
+
+static const u8 qmp_dp_v4_voltage_swing_hbr3_hbr2[4][4] = {
+ { 0x02, 0x12, 0x16, 0x1a },
+ { 0x09, 0x19, 0x1f, 0xff },
+ { 0x10, 0x1f, 0xff, 0xff },
+ { 0x1f, 0xff, 0xff, 0xff }
+};
+
+static const u8 qmp_dp_v4_pre_emphasis_hbr_rbr[4][4] = {
+ { 0x00, 0x0e, 0x15, 0x1b },
+ { 0x00, 0x0e, 0x15, 0xff },
+ { 0x00, 0x0e, 0xff, 0xff },
+ { 0x04, 0xff, 0xff, 0xff }
+};
+
+static const u8 qmp_dp_v4_voltage_swing_hbr_rbr[4][4] = {
+ { 0x08, 0x0f, 0x16, 0x1f },
+ { 0x11, 0x1e, 0x1f, 0xff },
+ { 0x16, 0x1f, 0xff, 0xff },
+ { 0x1f, 0xff, 0xff, 0xff }
+};
+
static void qcom_qmp_v4_phy_dp_aux_init(struct qmp_phy *qphy)
{
writel(DP_PHY_PD_CTL_PWRDN | DP_PHY_PD_CTL_PSR_PWRDN | DP_PHY_PD_CTL_AUX_PWRDN |
@@ -3757,16 +3796,14 @@ 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,
+ if (__qcom_qmp_phy_configure_dp_swing(qphy,
QSERDES_V4_TX_TX_DRV_LVL,
- QSERDES_V4_TX_TX_EMP_POST1_LVL);
+ QSERDES_V4_TX_TX_EMP_POST1_LVL,
+ (const u8 *)qmp_dp_v4_voltage_swing_hbr_rbr,
+ (const u8 *)qmp_dp_v4_pre_emphasis_hbr_rbr,
+ (const u8 *)qmp_dp_v4_voltage_swing_hbr3_hbr2,
+ (const u8 *)qmp_dp_v4_pre_emphasis_hbr3_hbr2) < 0)
+ return;
}
static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy)
@@ -3885,6 +3922,9 @@ 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 +3936,9 @@ 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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v3] phy: qcom-qmp: add support for display port voltage and pre-emphasis swing
2021-09-09 21:31 [PATCH v3] phy: qcom-qmp: add support for display port voltage and pre-emphasis swing Kuogee Hsieh
@ 2021-09-13 20:06 ` Stephen Boyd
0 siblings, 0 replies; 2+ messages in thread
From: Stephen Boyd @ 2021-09-13 20:06 UTC (permalink / raw)
To: Kuogee Hsieh, agross, bjorn.andersson, devicetree, robdclark,
robh+dt, sean, vkoul
Cc: abhinavk, aravindh, freedreno, linux-arm-msm, linux-kernel,
kishon, p.zabel
Quoting Kuogee Hsieh (2021-09-09 14:31:05)
> @@ -3757,16 +3796,14 @@ 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,
> + if (__qcom_qmp_phy_configure_dp_swing(qphy,
> QSERDES_V4_TX_TX_DRV_LVL,
> - QSERDES_V4_TX_TX_EMP_POST1_LVL);
> + QSERDES_V4_TX_TX_EMP_POST1_LVL,
> + (const u8 *)qmp_dp_v4_voltage_swing_hbr_rbr,
Surely we can pass a 2d-array to a function in C? We know the size of
the array is always a 4x4 so we could enforce that in the type so the
compiler complains if we try to pass something else.
> + (const u8 *)qmp_dp_v4_pre_emphasis_hbr_rbr,
> + (const u8 *)qmp_dp_v4_voltage_swing_hbr3_hbr2,
> + (const u8 *)qmp_dp_v4_pre_emphasis_hbr3_hbr2) < 0)
> + return;
It's void and this is the end of the function. Why is there an if
condition and a return?
> }
>
> static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy)
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2021-09-09 21:31 [PATCH v3] phy: qcom-qmp: add support for display port voltage and pre-emphasis swing Kuogee Hsieh
2021-09-13 20:06 ` Stephen Boyd
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