From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Kuogee Hsieh <khsieh@codeaurora.org>,
robdclark@gmail.com, sean@poorly.run, swboyd@chromium.org,
vkoul@kernel.org, agross@kernel.org, bjorn.andersson@linaro.org,
robh+dt@kernel.org, devicetree@vger.kernel.org
Cc: abhinavk@codeaurora.org, aravindh@codeaurora.org,
freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org, kishon@ti.com,
p.zabel@pengutronix.de
Subject: Re: [PATCH v2] phy: qcom-qmp: add support for display port voltage and pre-emphasis swing
Date: Fri, 3 Sep 2021 22:09:14 +0300 [thread overview]
Message-ID: <72483937-8ccb-331b-e1af-8f30f6cefc07@linaro.org> (raw)
In-Reply-To: <1630098658-23149-1-git-send-email-khsieh@codeaurora.org>
On 28/08/2021 00:10, Kuogee Hsieh wrote:
> 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()
>
> 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 | 117 ++++++++++++++++++++++++++----------
> 1 file changed, 85 insertions(+), 32 deletions(-)
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index 31036aa..021cbb0 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -3546,12 +3546,11 @@ 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)
As this becomes a v3-only function, could you please rename it to
qcom_qmp_v3_phy_configure_dp_swing()
> {
> 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;
> + u8 voltage, emphasis;
> int i;
>
> for (i = 0; i < dp_opts->lanes; i++) {
> @@ -3560,26 +3559,25 @@ static int qcom_qmp_phy_configure_dp_swing(struct qmp_phy *qphy,
> }
>
> 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 = qmp_dp_v3_voltage_swing_hbr_rbr[v_level][p_level];
> + emphasis = qmp_dp_v3_pre_emphasis_hbr_rbr[v_level][p_level];
> } 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 = qmp_dp_v3_voltage_swing_hbr3_hbr2[v_level][p_level];
> + emphasis = qmp_dp_v3_pre_emphasis_hbr3_hbr2[v_level][p_level];
> }
>
> /* 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 + QSERDES_V3_TX_TX_DRV_LVL);
> + writel(emphasis, qphy->tx + QSERDES_V3_TX_TX_EMP_POST1_LVL);
> + writel(voltage, qphy->tx2 + QSERDES_V3_TX_TX_DRV_LVL);
> + writel(emphasis, qphy->tx2 + QSERDES_V3_TX_TX_EMP_POST1_LVL);
> return 0;
> }
>
> @@ -3588,9 +3586,7 @@ 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) < 0)
> return;
>
> if (dp_opts->lanes == 1) {
> @@ -3728,6 +3724,71 @@ 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 int qcom_qmp_v4_phy_configure_dp_swing(struct qmp_phy *qphy)
> +{
> + const struct phy_configure_opts_dp *dp_opts = &qphy->dp_opts;
> + unsigned int v_level = 0, p_level = 0;
> + u8 voltage, emphasis;
> + 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 = qmp_dp_v4_voltage_swing_hbr_rbr[v_level][p_level];
> + emphasis = qmp_dp_v4_pre_emphasis_hbr_rbr[v_level][p_level];
> + } else {
> + voltage = qmp_dp_v4_voltage_swing_hbr3_hbr2[v_level][p_level];
> + emphasis = qmp_dp_v4_pre_emphasis_hbr3_hbr2[v_level][p_level];
> + }
> +
> + /* TODO: Move check to config check */
> + if (voltage == 0xFF && emphasis == 0xFF)
> + return -EINVAL;
> +
> + /* Enable MUX to use Cursor values from these registers */
> + voltage |= DP_PHY_TXn_TX_DRV_LVL_MUX_EN;
> + emphasis |= DP_PHY_TXn_TX_EMP_POST1_LVL_MUX_EN;
> +
> + writel(voltage, qphy->tx + QSERDES_V4_TX_TX_DRV_LVL);
> + writel(emphasis, qphy->tx + QSERDES_V4_TX_TX_EMP_POST1_LVL);
> + writel(voltage, qphy->tx2 + QSERDES_V4_TX_TX_DRV_LVL);
> + writel(emphasis, qphy->tx2 + QSERDES_V4_TX_TX_EMP_POST1_LVL);
> +
> + return 0;
> +}
> +
> 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 +3818,7 @@ 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,
> - QSERDES_V4_TX_TX_DRV_LVL,
> - QSERDES_V4_TX_TX_EMP_POST1_LVL);
> + qcom_qmp_v4_phy_configure_dp_swing(qphy);
> }
>
> static int qcom_qmp_v4_phy_configure_dp_phy(struct qmp_phy *qphy)
> @@ -3885,6 +3937,9 @@ 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 +3951,9 @@ 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);
>
--
With best wishes
Dmitry
next prev parent reply other threads:[~2021-09-03 19:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-27 21:10 [PATCH v2] phy: qcom-qmp: add support for display port voltage and pre-emphasis swing Kuogee Hsieh
2021-09-03 19:09 ` Dmitry Baryshkov [this message]
2021-09-03 19:16 ` Stephen Boyd
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=72483937-8ccb-331b-e1af-8f30f6cefc07@linaro.org \
--to=dmitry.baryshkov@linaro.org \
--cc=abhinavk@codeaurora.org \
--cc=agross@kernel.org \
--cc=aravindh@codeaurora.org \
--cc=bjorn.andersson@linaro.org \
--cc=devicetree@vger.kernel.org \
--cc=freedreno@lists.freedesktop.org \
--cc=khsieh@codeaurora.org \
--cc=kishon@ti.com \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=p.zabel@pengutronix.de \
--cc=robdclark@gmail.com \
--cc=robh+dt@kernel.org \
--cc=sean@poorly.run \
--cc=swboyd@chromium.org \
--cc=vkoul@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).