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SubjectRe: [PATCH 2/8] phy: qcom-qmp: Register typec mux and orientation switch
On 27-12-21, 21:21, Bjorn Andersson wrote:
> The QMP PHY handles muxing of USB vs DisplayPort, as well as orientation
> switching of the SuperSpeed lanes. So register typec handlers for the
> two types.
>
> The TypeC mux allows switching between four lanes of DisplayPort and a
> mixed USB+DP combination. This makes it possible to reach resolutions
> that requires 4 lanes.
>
> The TypeC switch allows switching the SuperSpeed pins and have been
> tested with both 2 and 4 lane DisplayPort.
>
> It's possible that in the USB mode the DP_MODE should be disabled, but
> this is left untouched.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>
> My suggestion is that if/once this patch is deemed acceptable the PHY
> maintainers could create a immutable branch/tag which can be merged into the
> PHY tree as well as the USB tree.
>
> drivers/phy/qualcomm/phy-qcom-qmp.c | 176 +++++++++++++++++++++++++---
> 1 file changed, 158 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
> index 7bea6a60dc54..8d8139df9d8e 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
> @@ -19,6 +19,8 @@
> #include <linux/regulator/consumer.h>
> #include <linux/reset.h>
> #include <linux/slab.h>
> +#include <linux/usb/typec_dp.h>
> +#include <linux/usb/typec_mux.h>
>
> #include <dt-bindings/phy/phy.h>
>
> @@ -3017,6 +3019,9 @@ struct qmp_phy_dp_clks {
> * @phy_mutex: mutex lock for PHY common block initialization
> * @init_count: phy common block initialization count
> * @ufs_reset: optional UFS PHY reset handle
> + * @sw: typec switch for receiving orientation changes
> + * @mux: typec mux for DP muxing
> + * @orientation: carries current CC orientation
> */
> struct qcom_qmp {
> struct device *dev;
> @@ -3032,6 +3037,10 @@ struct qcom_qmp {
> int init_count;
>
> struct reset_control *ufs_reset;
> +
> + struct typec_switch *sw;
> + struct typec_mux *mux;
> + enum typec_orientation orientation;
> };
>
> static void qcom_qmp_v3_phy_dp_aux_init(struct qmp_phy *qphy);
> @@ -4378,30 +4387,23 @@ static void qcom_qmp_v3_phy_configure_dp_tx(struct qmp_phy *qphy)
>
> static bool qcom_qmp_phy_configure_dp_mode(struct qmp_phy *qphy)
> {
> + const struct phy_configure_opts_dp *dp_opts = &qphy->dp_opts;
> + bool reverse = qphy->qmp->orientation == TYPEC_ORIENTATION_REVERSE;
> u32 val;
> - bool reverse = false;
>
> val = DP_PHY_PD_CTL_PWRDN | DP_PHY_PD_CTL_AUX_PWRDN |
> DP_PHY_PD_CTL_PLL_PWRDN | DP_PHY_PD_CTL_DP_CLAMP_EN;
>
> - /*
> - * TODO: Assume orientation is CC1 for now and two lanes, need to
> - * use type-c connector to understand orientation and lanes.
> - *
> - * Otherwise val changes to be like below if this code understood
> - * the orientation of the type-c cable.
> - *
> - * if (lane_cnt == 4 || orientation == ORIENTATION_CC2)
> - * val |= DP_PHY_PD_CTL_LANE_0_1_PWRDN;
> - * if (lane_cnt == 4 || orientation == ORIENTATION_CC1)
> - * val |= DP_PHY_PD_CTL_LANE_2_3_PWRDN;
> - * if (orientation == ORIENTATION_CC2)
> - * writel(0x4c, qphy->pcs + QSERDES_V3_DP_PHY_MODE);
> - */
> - val |= DP_PHY_PD_CTL_LANE_2_3_PWRDN;
> + if (dp_opts->lanes == 4 || reverse)
> + val |= DP_PHY_PD_CTL_LANE_0_1_PWRDN;
> + if (dp_opts->lanes == 4 || !reverse)
> + val |= DP_PHY_PD_CTL_LANE_2_3_PWRDN;
> writel(val, qphy->pcs + QSERDES_DP_PHY_PD_CTL);
>
> - writel(0x5c, qphy->pcs + QSERDES_DP_PHY_MODE);
> + if (reverse)
> + writel(0x4c, qphy->pcs + QSERDES_DP_PHY_MODE);
> + else
> + writel(0x5c, qphy->pcs + QSERDES_DP_PHY_MODE);
>
> return reverse;
> }
> @@ -5809,6 +5811,123 @@ static const struct dev_pm_ops qcom_qmp_phy_pm_ops = {
> qcom_qmp_phy_runtime_resume, NULL)
> };
>
> +#if IS_ENABLED(CONFIG_TYPEC)
> +static int qcom_qmp_phy_typec_switch_set(struct typec_switch *sw,
> + enum typec_orientation orientation)

pls align to preceding open brace (here and other places)

> +{
> + struct qcom_qmp *qmp = typec_switch_get_drvdata(sw);
> + void __iomem *dp_com = qmp->dp_com;
> +
> + qmp->orientation = orientation;
> +
> + if (orientation == TYPEC_ORIENTATION_REVERSE)
> + qphy_setbits(dp_com, QPHY_V3_DP_COM_TYPEC_CTRL, 0x01);
> + else
> + qphy_clrbits(dp_com, QPHY_V3_DP_COM_TYPEC_CTRL, 0x01);
> +
> + return 0;
> +}
> +
> +static int qcom_qmp_phy_typec_mux_set(struct typec_mux *mux,
> + struct typec_mux_state *state)
> +{
> + struct qcom_qmp *qmp = typec_mux_get_drvdata(mux);
> + void __iomem *dp_com = qmp->dp_com;
> + bool dp_mode;
> + bool usb_mode;
> +
> + switch (state->mode) {
> + case TYPEC_STATE_SAFE:
> + case TYPEC_STATE_USB:
> + /*
> + * TODO: Figure out if we should clear DP_MODE when we enter a
> + * USB-only state.
> + */
> + dp_mode = true;

should this be false for these states?

> + usb_mode = true;
> + break;
> + case TYPEC_DP_STATE_A:
> + case TYPEC_DP_STATE_C:
> + case TYPEC_DP_STATE_E:
> + dp_mode = true;
> + usb_mode = false;
> + break;
> + case TYPEC_DP_STATE_B:
> + case TYPEC_DP_STATE_D:
> + case TYPEC_DP_STATE_F:
> + dp_mode = true;
> + usb_mode = true;
> + break;
> + }

looks like dp_mode is true always. And only for DP state A C E, usb_mode
is false...

> +
> + qphy_setbits(dp_com, QPHY_V3_DP_COM_RESET_OVRD_CTRL,
> + SW_DPPHY_RESET_MUX | SW_USB3PHY_RESET_MUX);
> + if (dp_mode)
> + qphy_setbits(dp_com, QPHY_V3_DP_COM_PHY_MODE_CTRL, DP_MODE);
> + else
> + qphy_clrbits(dp_com, QPHY_V3_DP_COM_PHY_MODE_CTRL, DP_MODE);
> +
> + if (usb_mode)
> + qphy_setbits(dp_com, QPHY_V3_DP_COM_PHY_MODE_CTRL, USB3_MODE);
> + else
> + qphy_clrbits(dp_com, QPHY_V3_DP_COM_PHY_MODE_CTRL, USB3_MODE);
> +
> + qphy_setbits(dp_com, QPHY_V3_DP_COM_SW_RESET, SW_RESET);
> + qphy_clrbits(dp_com, QPHY_V3_DP_COM_SWI_CTRL, 0x03);
> + qphy_clrbits(dp_com, QPHY_V3_DP_COM_SW_RESET, SW_RESET);
> +
> + return 0;
> +}
> +
> +static int qcom_qmp_phy_typec_register(struct qcom_qmp *qmp,
> + const struct qmp_phy_cfg *cfg)
> +{
> + struct typec_switch_desc sw_desc = {};
> + struct typec_mux_desc mux_desc = {};
> + struct device *dev = qmp->dev;
> +
> + if (!cfg->has_phy_dp_com_ctrl)
> + return 0;
> +
> + sw_desc.drvdata = qmp;
> + sw_desc.fwnode = dev->fwnode;
> + sw_desc.set = qcom_qmp_phy_typec_switch_set;
> + qmp->sw = typec_switch_register(dev, &sw_desc);
> + if (IS_ERR(qmp->sw)) {
> + dev_err(dev, "Error registering typec switch: %pe\n", qmp->sw);
> + return PTR_ERR(qmp->sw);
> + }
> +
> + mux_desc.drvdata = qmp;
> + mux_desc.fwnode = dev->fwnode;
> + mux_desc.set = qcom_qmp_phy_typec_mux_set;
> + qmp->mux = typec_mux_register(dev, &mux_desc);
> + if (IS_ERR(qmp->mux)) {
> + dev_err(dev, "Error registering typec mux: %pe\n", qmp->mux);
> + typec_switch_unregister(qmp->sw);
> + return PTR_ERR(qmp->mux);
> + }
> +
> + return 0;
> +}
> +
> +static void qcom_qmp_phy_typec_unregister(struct qcom_qmp *qmp)
> +{
> + typec_mux_unregister(qmp->mux);
> + typec_switch_unregister(qmp->sw);
> +}
> +#else

empty line here pls

> +static int qcom_qmp_phy_typec_register(struct qcom_qmp *qmp,
> + const struct qmp_phy_cfg *cfg)
> +{
> + return 0;
> +}
> +
> +static void qcom_qmp_phy_typec_unregister(struct qcom_qmp *qmp)
> +{
> +}
> +#endif
> +
> static int qcom_qmp_phy_probe(struct platform_device *pdev)
> {
> struct qcom_qmp *qmp;
> @@ -5891,7 +6010,15 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev)
> return ret;
> }
>
> - num = of_get_available_child_count(dev->of_node);
> + ret = qcom_qmp_phy_typec_register(qmp, cfg);
> + if (ret)
> + return ret;
> +
> + num = 0;
> + for_each_available_child_of_node(dev->of_node, child) {
> + if (!of_node_name_eq(child, "port"))
> + num++;
> + }
> /* do we have a rogue child node ? */
> if (num > expected_phys)
> return -EINVAL;
> @@ -5918,6 +6045,9 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev)
> serdes = usb_serdes;
> }
>
> + if (of_node_name_eq(child, "port"))
> + continue;
> +
> /* Create per-lane phy */
> ret = qcom_qmp_phy_create(dev, child, id, serdes, cfg);
> if (ret) {
> @@ -5962,8 +6092,18 @@ static int qcom_qmp_phy_probe(struct platform_device *pdev)
> return ret;
> }
>
> +static int qcom_qmp_phy_remove(struct platform_device *pdev)
> +{
> + struct qcom_qmp *qmp = platform_get_drvdata(pdev);
> +
> + qcom_qmp_phy_typec_unregister(qmp);
> +
> + return 0;
> +}
> +
> static struct platform_driver qcom_qmp_phy_driver = {
> .probe = qcom_qmp_phy_probe,
> + .remove = qcom_qmp_phy_remove,
> .driver = {
> .name = "qcom-qmp-phy",
> .pm = &qcom_qmp_phy_pm_ops,
> --
> 2.33.1

--
~Vinod

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