| Message ID | 20231013-ptn36502-v1-2-98109a430efc@fairphone.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add driver for NXP PTN36502 Type-C redriver | expand |
Hi, On Fri, Oct 13, 2023 at 04:24:48PM +0200, Luca Weiss wrote: > Add a driver for the NXP PTN36502 Type-C USB 3.1 Gen 1 and DisplayPort > v1.2 combo redriver. > > Signed-off-by: Luca Weiss <luca.weiss@fairphone.com> Looks OK to me, but couple of nitpicks below. With those fixed: Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > --- > drivers/usb/typec/mux/Kconfig | 10 + > drivers/usb/typec/mux/Makefile | 1 + > drivers/usb/typec/mux/ptn36502.c | 421 +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 432 insertions(+) > > diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig > index 65da61150ba7..816b9bd08355 100644 > --- a/drivers/usb/typec/mux/Kconfig > +++ b/drivers/usb/typec/mux/Kconfig > @@ -46,4 +46,14 @@ config TYPEC_MUX_NB7VPQ904M > Say Y or M if your system has a On Semiconductor NB7VPQ904M Type-C > redriver chip found on some devices with a Type-C port. > > +config TYPEC_MUX_PTN36502 > + tristate "NXP PTN36502 Type-C redriver driver" > + depends on I2C > + depends on DRM || DRM=n > + select DRM_PANEL_BRIDGE if DRM > + select REGMAP_I2C > + help > + Say Y or M if your system has a NXP PTN36502 Type-C redriver chip > + found on some devices with a Type-C port. > + > endmenu > diff --git a/drivers/usb/typec/mux/Makefile b/drivers/usb/typec/mux/Makefile > index 76196096ef41..9d6a5557b0bd 100644 > --- a/drivers/usb/typec/mux/Makefile > +++ b/drivers/usb/typec/mux/Makefile > @@ -5,3 +5,4 @@ obj-$(CONFIG_TYPEC_MUX_GPIO_SBU) += gpio-sbu-mux.o > obj-$(CONFIG_TYPEC_MUX_PI3USB30532) += pi3usb30532.o > obj-$(CONFIG_TYPEC_MUX_INTEL_PMC) += intel_pmc_mux.o > obj-$(CONFIG_TYPEC_MUX_NB7VPQ904M) += nb7vpq904m.o > +obj-$(CONFIG_TYPEC_MUX_PTN36502) += ptn36502.o > diff --git a/drivers/usb/typec/mux/ptn36502.c b/drivers/usb/typec/mux/ptn36502.c > new file mode 100644 > index 000000000000..91684a856f3a > --- /dev/null > +++ b/drivers/usb/typec/mux/ptn36502.c > @@ -0,0 +1,421 @@ > +// SPDX-License-Identifier: GPL-2.0+ > +/* > + * NXP PTN36502 Type-C driver > + * > + * Copyright (C) 2023 Luca Weiss <luca.weiss@fairphone.com> > + * > + * Based on NB7VPQ904M driver: > + * Copyright (C) 2023 Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > + */ > + > +#include <drm/drm_bridge.h> > +#include <linux/bitfield.h> > +#include <linux/i2c.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/mutex.h> > +#include <linux/of_graph.h> > +#include <linux/regmap.h> > +#include <linux/regulator/consumer.h> > +#include <linux/usb/typec_dp.h> > +#include <linux/usb/typec_mux.h> > +#include <linux/usb/typec_retimer.h> > + > +#define PTN36502_CHIP_ID_REG 0x00 > +#define PTN36502_CHIP_ID 0x02 > + > +#define PTN36502_CHIP_REVISION_REG 0x01 > +#define PTN36502_CHIP_REVISION_BASE(val) FIELD_GET(GENMASK(7, 4), (val)) > +#define PTN36502_CHIP_REVISION_METAL(val) FIELD_GET(GENMASK(3, 0), (val)) > + > +#define PTN36502_DP_LINK_CTRL_REG 0x06 > +#define PTN36502_DP_LINK_CTRL_LANES_2 (2 << 2) > +#define PTN36502_DP_LINK_CTRL_LANES_4 (3 << 2) > +#define PTN36502_DP_LINK_CTRL_LINK_RATE_5_4GBPS (2 << 0) > + > +/* Registers for lane 0 (0x07) to lane 3 (0x0a) have the same layout */ > +#define PTN36502_DP_LANE_CTRL_REG(n) (0x07 + (n)) > +#define PTN36502_DP_LANE_CTRL_RX_GAIN_3DB (2<<4) > +#define PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD (2<<2) > +#define PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB (1<<0) > + > +#define PTN36502_MODE_CTRL1_REG 0x0b > +#define PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE (1<<5) > +#define PTN36502_MODE_CTRL1_AUX_CROSSBAR_SW_ON (1<<3) > +#define PTN36502_MODE_CTRL1_MODE_OFF (0<<0) > +#define PTN36502_MODE_CTRL1_MODE_USB_ONLY (1<<0) > +#define PTN36502_MODE_CTRL1_MODE_USB_DP (2<<0) > +#define PTN36502_MODE_CTRL1_MODE_DP (3<<0) > + > +#define PTN36502_DEVICE_CTRL_REG 0x0d > +#define PTN36502_DEVICE_CTRL_AUX_MONITORING_EN (1<<7) You have couple of different styles here. Please try to always use BIT() and GENMASK() macros when possible. At the very least put spaces around << and >>. > +struct ptn36502 { > + struct i2c_client *client; > + struct regulator *vdd18_supply; > + struct regmap *regmap; > + struct typec_switch_dev *sw; > + struct typec_retimer *retimer; > + > + struct typec_switch *typec_switch; > + > + struct drm_bridge bridge; > + > + struct mutex lock; /* protect non-concurrent retimer & switch */ > + > + enum typec_orientation orientation; > + unsigned long mode; > + unsigned int svid; > +}; > + > +static int ptn36502_set(struct ptn36502 *ptn) > +{ > + bool reverse = (ptn->orientation == TYPEC_ORIENTATION_REVERSE); > + unsigned int ctrl1_val = 0; > + unsigned int lane_ctrl_val = 0; > + unsigned int link_ctrl_val = 0; > + > + switch (ptn->mode) { > + case TYPEC_STATE_SAFE: > + /* Deep power saving state */ > + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, > + PTN36502_MODE_CTRL1_MODE_OFF); > + return 0; > + > + case TYPEC_STATE_USB: > + /* > + * Normal Orientation (CC1) > + * A -> USB RX > + * B -> USB TX > + * C -> X > + * D -> X > + * Flipped Orientation (CC2) > + * A -> X > + * B -> X > + * C -> USB TX > + * D -> USB RX > + */ > + > + /* USB 3.1 Gen 1 only */ > + ctrl1_val = PTN36502_MODE_CTRL1_MODE_USB_ONLY; > + if (reverse) > + ctrl1_val |= PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE; > + > + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, ctrl1_val); > + return 0; > + > + default: > + if (ptn->svid != USB_TYPEC_DP_SID) > + return -EINVAL; > + > + break; > + } > + > + /* DP Altmode Setup */ > + > + switch (ptn->mode) { > + case TYPEC_DP_STATE_C: > + case TYPEC_DP_STATE_E: > + /* > + * Normal Orientation (CC1) > + * A -> DP3 > + * B -> DP2 > + * C -> DP1 > + * D -> DP0 > + * Flipped Orientation (CC2) > + * A -> DP0 > + * B -> DP1 > + * C -> DP2 > + * D -> DP3 > + */ > + > + /* 4-lane DP */ > + ctrl1_val |= PTN36502_MODE_CTRL1_MODE_DP; > + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LANES_4; > + break; > + > + case TYPEC_DP_STATE_D: > + case TYPEC_DP_STATE_F: /* State F is deprecated */ > + /* > + * Normal Orientation (CC1) > + * A -> USB RX > + * B -> USB TX > + * C -> DP1 > + * D -> DP0 > + * Flipped Orientation (CC2) > + * A -> DP0 > + * B -> DP1 > + * C -> USB TX > + * D -> USB RX > + */ > + > + /* USB 3.1 Gen 1 and 2-lane DP */ > + ctrl1_val |= PTN36502_MODE_CTRL1_MODE_USB_DP; > + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LANES_2; > + break; > + > + default: > + return -EOPNOTSUPP; > + } > + > + /* Enable AUX monitoring */ > + regmap_write(ptn->regmap, PTN36502_DEVICE_CTRL_REG, > + PTN36502_DEVICE_CTRL_AUX_MONITORING_EN); > + > + /* Enable AUX switch path */ > + ctrl1_val |= PTN36502_MODE_CTRL1_AUX_CROSSBAR_SW_ON; > + if (reverse) > + ctrl1_val |= PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE; > + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, ctrl1_val); > + > + /* DP Link rate: 5.4 Gbps (HBR2) */ > + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LINK_RATE_5_4GBPS; > + regmap_write(ptn->regmap, PTN36502_DP_LINK_CTRL_REG, link_ctrl_val); > + > + /* > + * For all lanes: > + * - Rx equivalization gain: 3 dB > + * - TX output swing control: 800 mVppd > + * - Pre-emphasis control: 3.5 dB > + */ > + lane_ctrl_val = PTN36502_DP_LANE_CTRL_RX_GAIN_3DB | > + PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD | > + PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB; > + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(0), lane_ctrl_val); > + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(1), lane_ctrl_val); > + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(2), lane_ctrl_val); > + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(3), lane_ctrl_val); > + > + return 0; > +} > + > +static int ptn36502_sw_set(struct typec_switch_dev *sw, enum typec_orientation orientation) > +{ > + struct ptn36502 *ptn = typec_switch_get_drvdata(sw); > + int ret; > + > + ret = typec_switch_set(ptn->typec_switch, orientation); > + if (ret) > + return ret; > + > + mutex_lock(&ptn->lock); > + > + if (ptn->orientation != orientation) { > + ptn->orientation = orientation; > + > + ret = ptn36502_set(ptn); > + } > + > + mutex_unlock(&ptn->lock); > + > + return ret; > +} > + > +static int ptn36502_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state) > +{ > + struct ptn36502 *ptn = typec_retimer_get_drvdata(retimer); > + int ret = 0; > + > + mutex_lock(&ptn->lock); > + > + if (ptn->mode != state->mode) { > + ptn->mode = state->mode; > + > + if (state->alt) > + ptn->svid = state->alt->svid; > + else > + ptn->svid = 0; // No SVID > + > + ret = ptn36502_set(ptn); > + } > + > + mutex_unlock(&ptn->lock); > + > + return ret; > +} > + > +static int ptn36502_detect(struct ptn36502 *ptn) > +{ > + struct device *dev = &ptn->client->dev; > + unsigned int reg_val; > + int ret; > + > + ret = regmap_read(ptn->regmap, PTN36502_CHIP_ID_REG, > + ®_val); > + if (ret < 0) > + return dev_err_probe(dev, ret, "Failed to read chip ID\n"); > + > + if (reg_val != PTN36502_CHIP_ID) > + return dev_err_probe(dev, -ENODEV, "Unexpected chip ID: %x\n", reg_val); > + > + ret = regmap_read(ptn->regmap, PTN36502_CHIP_REVISION_REG, > + ®_val); > + if (ret < 0) > + return dev_err_probe(dev, ret, "Failed to read chip revision\n"); > + > + dev_dbg(dev, "Chip revision: base layer version %lx, metal layer version %lx\n", > + PTN36502_CHIP_REVISION_BASE(reg_val), > + PTN36502_CHIP_REVISION_METAL(reg_val)); > + > + return 0; > +} > + > +#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_PANEL_BRIDGE) > +static int ptn36502_bridge_attach(struct drm_bridge *bridge, > + enum drm_bridge_attach_flags flags) I applied this patch and realised that that's not correctly aligned. There are couple of extra spaces. > +{ > + struct ptn36502 *ptn = container_of(bridge, struct ptn36502, bridge); > + struct drm_bridge *next_bridge; > + > + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) > + return -EINVAL; > + > + next_bridge = devm_drm_of_get_bridge(&ptn->client->dev, ptn->client->dev.of_node, 0, 0); > + if (IS_ERR(next_bridge)) { > + dev_err(&ptn->client->dev, "failed to acquire drm_bridge: %pe\n", next_bridge); > + return PTR_ERR(next_bridge); > + } > + > + return drm_bridge_attach(bridge->encoder, next_bridge, bridge, > + DRM_BRIDGE_ATTACH_NO_CONNECTOR); > +} > + > +static const struct drm_bridge_funcs ptn36502_bridge_funcs = { > + .attach = ptn36502_bridge_attach, > +}; > + > +static int ptn36502_register_bridge(struct ptn36502 *ptn) > +{ > + ptn->bridge.funcs = &ptn36502_bridge_funcs; > + ptn->bridge.of_node = ptn->client->dev.of_node; > + > + return devm_drm_bridge_add(&ptn->client->dev, &ptn->bridge); > +} > +#else > +static int ptn36502_register_bridge(struct ptn36502 *ptn) > +{ > + return 0; > +} > +#endif > + > +static const struct regmap_config ptn36502_regmap = { > + .max_register = 0x0d, > + .reg_bits = 8, > + .val_bits = 8, > +}; > + > +static int ptn36502_probe(struct i2c_client *client) > +{ > + struct device *dev = &client->dev; > + struct typec_switch_desc sw_desc = { }; > + struct typec_retimer_desc retimer_desc = { }; > + struct ptn36502 *ptn; > + int ret; > + > + ptn = devm_kzalloc(dev, sizeof(*ptn), GFP_KERNEL); > + if (!ptn) > + return -ENOMEM; > + > + ptn->client = client; > + > + ptn->regmap = devm_regmap_init_i2c(client, &ptn36502_regmap); > + if (IS_ERR(ptn->regmap)) { > + dev_err(&client->dev, "Failed to allocate register map\n"); > + return PTR_ERR(ptn->regmap); > + } > + > + ptn->mode = TYPEC_STATE_SAFE; > + ptn->orientation = TYPEC_ORIENTATION_NONE; > + > + mutex_init(&ptn->lock); > + > + ptn->vdd18_supply = devm_regulator_get_optional(dev, "vdd18"); > + if (IS_ERR(ptn->vdd18_supply)) > + return PTR_ERR(ptn->vdd18_supply); > + > + ptn->typec_switch = fwnode_typec_switch_get(dev->fwnode); > + if (IS_ERR(ptn->typec_switch)) > + return dev_err_probe(dev, PTR_ERR(ptn->typec_switch), > + "Failed to acquire orientation-switch\n"); > + > + ret = regulator_enable(ptn->vdd18_supply); > + if (ret) > + return dev_err_probe(dev, ret, "Failed to enable vdd18\n"); > + > + ret = ptn36502_detect(ptn); > + if (ret) > + goto err_disable_regulator; > + > + ret = ptn36502_register_bridge(ptn); > + if (ret) > + goto err_disable_regulator; > + > + sw_desc.drvdata = ptn; > + sw_desc.fwnode = dev->fwnode; > + sw_desc.set = ptn36502_sw_set; > + > + ptn->sw = typec_switch_register(dev, &sw_desc); > + if (IS_ERR(ptn->sw)) { > + ret = dev_err_probe(dev, PTR_ERR(ptn->sw), > + "Failed to register typec switch\n"); > + goto err_disable_regulator; > + } > + > + retimer_desc.drvdata = ptn; > + retimer_desc.fwnode = dev->fwnode; > + retimer_desc.set = ptn36502_retimer_set; > + > + ptn->retimer = typec_retimer_register(dev, &retimer_desc); > + if (IS_ERR(ptn->retimer)) { > + ret = dev_err_probe(dev, PTR_ERR(ptn->retimer), > + "Failed to register typec retimer\n"); > + goto err_switch_unregister; > + } > + > + return 0; > + > +err_switch_unregister: > + typec_switch_unregister(ptn->sw); > + > +err_disable_regulator: > + regulator_disable(ptn->vdd18_supply); > + > + return ret; > +} > + > +static void ptn36502_remove(struct i2c_client *client) > +{ > + struct ptn36502 *ptn = i2c_get_clientdata(client); > + > + typec_retimer_unregister(ptn->retimer); > + typec_switch_unregister(ptn->sw); > + > + regulator_disable(ptn->vdd18_supply); > +} > + > +static const struct i2c_device_id ptn36502_table[] = { > + { "ptn36502" }, > + { } > +}; > +MODULE_DEVICE_TABLE(i2c, ptn36502_table); > + > +static const struct of_device_id ptn36502_of_table[] = { > + { .compatible = "nxp,ptn36502" }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, ptn36502_of_table); > + > +static struct i2c_driver ptn36502_driver = { > + .driver = { > + .name = "ptn36502", > + .of_match_table = ptn36502_of_table, > + }, > + .probe = ptn36502_probe, > + .remove = ptn36502_remove, > + .id_table = ptn36502_table, > +}; > +module_i2c_driver(ptn36502_driver); > + > +MODULE_AUTHOR("Luca Weiss <luca.weiss@fairphone.com>"); > +MODULE_DESCRIPTION("NXP PTN36502 Type-C driver"); > +MODULE_LICENSE("GPL"); thanks,
On Tue Oct 17, 2023 at 10:34 AM CEST, Heikki Krogerus wrote: > Hi, > > On Fri, Oct 13, 2023 at 04:24:48PM +0200, Luca Weiss wrote: > > Add a driver for the NXP PTN36502 Type-C USB 3.1 Gen 1 and DisplayPort > > v1.2 combo redriver. > > > > Signed-off-by: Luca Weiss <luca.weiss@fairphone.com> > > Looks OK to me, but couple of nitpicks below. With those fixed: > > Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > > > --- > > drivers/usb/typec/mux/Kconfig | 10 + > > drivers/usb/typec/mux/Makefile | 1 + > > drivers/usb/typec/mux/ptn36502.c | 421 +++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 432 insertions(+) > > > > diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig > > index 65da61150ba7..816b9bd08355 100644 > > --- a/drivers/usb/typec/mux/Kconfig > > +++ b/drivers/usb/typec/mux/Kconfig > > @@ -46,4 +46,14 @@ config TYPEC_MUX_NB7VPQ904M > > Say Y or M if your system has a On Semiconductor NB7VPQ904M Type-C > > redriver chip found on some devices with a Type-C port. > > > > +config TYPEC_MUX_PTN36502 > > + tristate "NXP PTN36502 Type-C redriver driver" > > + depends on I2C > > + depends on DRM || DRM=n > > + select DRM_PANEL_BRIDGE if DRM > > + select REGMAP_I2C > > + help > > + Say Y or M if your system has a NXP PTN36502 Type-C redriver chip > > + found on some devices with a Type-C port. > > + > > endmenu > > diff --git a/drivers/usb/typec/mux/Makefile b/drivers/usb/typec/mux/Makefile > > index 76196096ef41..9d6a5557b0bd 100644 > > --- a/drivers/usb/typec/mux/Makefile > > +++ b/drivers/usb/typec/mux/Makefile > > @@ -5,3 +5,4 @@ obj-$(CONFIG_TYPEC_MUX_GPIO_SBU) += gpio-sbu-mux.o > > obj-$(CONFIG_TYPEC_MUX_PI3USB30532) += pi3usb30532.o > > obj-$(CONFIG_TYPEC_MUX_INTEL_PMC) += intel_pmc_mux.o > > obj-$(CONFIG_TYPEC_MUX_NB7VPQ904M) += nb7vpq904m.o > > +obj-$(CONFIG_TYPEC_MUX_PTN36502) += ptn36502.o > > diff --git a/drivers/usb/typec/mux/ptn36502.c b/drivers/usb/typec/mux/ptn36502.c > > new file mode 100644 > > index 000000000000..91684a856f3a > > --- /dev/null > > +++ b/drivers/usb/typec/mux/ptn36502.c > > @@ -0,0 +1,421 @@ > > +// SPDX-License-Identifier: GPL-2.0+ > > +/* > > + * NXP PTN36502 Type-C driver > > + * > > + * Copyright (C) 2023 Luca Weiss <luca.weiss@fairphone.com> > > + * > > + * Based on NB7VPQ904M driver: > > + * Copyright (C) 2023 Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > > + */ > > + > > +#include <drm/drm_bridge.h> > > +#include <linux/bitfield.h> > > +#include <linux/i2c.h> > > +#include <linux/kernel.h> > > +#include <linux/module.h> > > +#include <linux/mutex.h> > > +#include <linux/of_graph.h> > > +#include <linux/regmap.h> > > +#include <linux/regulator/consumer.h> > > +#include <linux/usb/typec_dp.h> > > +#include <linux/usb/typec_mux.h> > > +#include <linux/usb/typec_retimer.h> > > + > > +#define PTN36502_CHIP_ID_REG 0x00 > > +#define PTN36502_CHIP_ID 0x02 > > + > > +#define PTN36502_CHIP_REVISION_REG 0x01 > > +#define PTN36502_CHIP_REVISION_BASE(val) FIELD_GET(GENMASK(7, 4), (val)) > > +#define PTN36502_CHIP_REVISION_METAL(val) FIELD_GET(GENMASK(3, 0), (val)) > > + > > +#define PTN36502_DP_LINK_CTRL_REG 0x06 > > +#define PTN36502_DP_LINK_CTRL_LANES_2 (2 << 2) > > +#define PTN36502_DP_LINK_CTRL_LANES_4 (3 << 2) > > +#define PTN36502_DP_LINK_CTRL_LINK_RATE_5_4GBPS (2 << 0) > > + > > +/* Registers for lane 0 (0x07) to lane 3 (0x0a) have the same layout */ > > +#define PTN36502_DP_LANE_CTRL_REG(n) (0x07 + (n)) > > +#define PTN36502_DP_LANE_CTRL_RX_GAIN_3DB (2<<4) > > +#define PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD (2<<2) > > +#define PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB (1<<0) > > + > > +#define PTN36502_MODE_CTRL1_REG 0x0b > > +#define PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE (1<<5) > > +#define PTN36502_MODE_CTRL1_AUX_CROSSBAR_SW_ON (1<<3) > > +#define PTN36502_MODE_CTRL1_MODE_OFF (0<<0) > > +#define PTN36502_MODE_CTRL1_MODE_USB_ONLY (1<<0) > > +#define PTN36502_MODE_CTRL1_MODE_USB_DP (2<<0) > > +#define PTN36502_MODE_CTRL1_MODE_DP (3<<0) > > + > > +#define PTN36502_DEVICE_CTRL_REG 0x0d > > +#define PTN36502_DEVICE_CTRL_AUX_MONITORING_EN (1<<7) > > You have couple of different styles here. Please try to always use > BIT() and GENMASK() macros when possible. At the very least put spaces > around << and >>. Hi Heikki, I was wondering when writing that whether GENMASK was actually proper use for values you write to registers, when not actually used as a bitmask. Since the datasheet refers to e.g. with TX_SWING_800MVPPD (2<<2) that you write a '2' to the correct bits of this register. But when using BIT(3) kind of hides this relationship if someone refers back to the datasheet. Or same with "3<<2" -> GENMASK(3, 2) or whatever. Let me know what you think. Regards Luca > > > +struct ptn36502 { > > + struct i2c_client *client; > > + struct regulator *vdd18_supply; > > + struct regmap *regmap; > > + struct typec_switch_dev *sw; > > + struct typec_retimer *retimer; > > + > > + struct typec_switch *typec_switch; > > + > > + struct drm_bridge bridge; > > + > > + struct mutex lock; /* protect non-concurrent retimer & switch */ > > + > > + enum typec_orientation orientation; > > + unsigned long mode; > > + unsigned int svid; > > +}; > > + > > +static int ptn36502_set(struct ptn36502 *ptn) > > +{ > > + bool reverse = (ptn->orientation == TYPEC_ORIENTATION_REVERSE); > > + unsigned int ctrl1_val = 0; > > + unsigned int lane_ctrl_val = 0; > > + unsigned int link_ctrl_val = 0; > > + > > + switch (ptn->mode) { > > + case TYPEC_STATE_SAFE: > > + /* Deep power saving state */ > > + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, > > + PTN36502_MODE_CTRL1_MODE_OFF); > > + return 0; > > + > > + case TYPEC_STATE_USB: > > + /* > > + * Normal Orientation (CC1) > > + * A -> USB RX > > + * B -> USB TX > > + * C -> X > > + * D -> X > > + * Flipped Orientation (CC2) > > + * A -> X > > + * B -> X > > + * C -> USB TX > > + * D -> USB RX > > + */ > > + > > + /* USB 3.1 Gen 1 only */ > > + ctrl1_val = PTN36502_MODE_CTRL1_MODE_USB_ONLY; > > + if (reverse) > > + ctrl1_val |= PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE; > > + > > + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, ctrl1_val); > > + return 0; > > + > > + default: > > + if (ptn->svid != USB_TYPEC_DP_SID) > > + return -EINVAL; > > + > > + break; > > + } > > + > > + /* DP Altmode Setup */ > > + > > + switch (ptn->mode) { > > + case TYPEC_DP_STATE_C: > > + case TYPEC_DP_STATE_E: > > + /* > > + * Normal Orientation (CC1) > > + * A -> DP3 > > + * B -> DP2 > > + * C -> DP1 > > + * D -> DP0 > > + * Flipped Orientation (CC2) > > + * A -> DP0 > > + * B -> DP1 > > + * C -> DP2 > > + * D -> DP3 > > + */ > > + > > + /* 4-lane DP */ > > + ctrl1_val |= PTN36502_MODE_CTRL1_MODE_DP; > > + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LANES_4; > > + break; > > + > > + case TYPEC_DP_STATE_D: > > + case TYPEC_DP_STATE_F: /* State F is deprecated */ > > + /* > > + * Normal Orientation (CC1) > > + * A -> USB RX > > + * B -> USB TX > > + * C -> DP1 > > + * D -> DP0 > > + * Flipped Orientation (CC2) > > + * A -> DP0 > > + * B -> DP1 > > + * C -> USB TX > > + * D -> USB RX > > + */ > > + > > + /* USB 3.1 Gen 1 and 2-lane DP */ > > + ctrl1_val |= PTN36502_MODE_CTRL1_MODE_USB_DP; > > + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LANES_2; > > + break; > > + > > + default: > > + return -EOPNOTSUPP; > > + } > > + > > + /* Enable AUX monitoring */ > > + regmap_write(ptn->regmap, PTN36502_DEVICE_CTRL_REG, > > + PTN36502_DEVICE_CTRL_AUX_MONITORING_EN); > > + > > + /* Enable AUX switch path */ > > + ctrl1_val |= PTN36502_MODE_CTRL1_AUX_CROSSBAR_SW_ON; > > + if (reverse) > > + ctrl1_val |= PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE; > > + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, ctrl1_val); > > + > > + /* DP Link rate: 5.4 Gbps (HBR2) */ > > + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LINK_RATE_5_4GBPS; > > + regmap_write(ptn->regmap, PTN36502_DP_LINK_CTRL_REG, link_ctrl_val); > > + > > + /* > > + * For all lanes: > > + * - Rx equivalization gain: 3 dB > > + * - TX output swing control: 800 mVppd > > + * - Pre-emphasis control: 3.5 dB > > + */ > > + lane_ctrl_val = PTN36502_DP_LANE_CTRL_RX_GAIN_3DB | > > + PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD | > > + PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB; > > + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(0), lane_ctrl_val); > > + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(1), lane_ctrl_val); > > + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(2), lane_ctrl_val); > > + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(3), lane_ctrl_val); > > + > > + return 0; > > +} > > + > > +static int ptn36502_sw_set(struct typec_switch_dev *sw, enum typec_orientation orientation) > > +{ > > + struct ptn36502 *ptn = typec_switch_get_drvdata(sw); > > + int ret; > > + > > + ret = typec_switch_set(ptn->typec_switch, orientation); > > + if (ret) > > + return ret; > > + > > + mutex_lock(&ptn->lock); > > + > > + if (ptn->orientation != orientation) { > > + ptn->orientation = orientation; > > + > > + ret = ptn36502_set(ptn); > > + } > > + > > + mutex_unlock(&ptn->lock); > > + > > + return ret; > > +} > > + > > +static int ptn36502_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state) > > +{ > > + struct ptn36502 *ptn = typec_retimer_get_drvdata(retimer); > > + int ret = 0; > > + > > + mutex_lock(&ptn->lock); > > + > > + if (ptn->mode != state->mode) { > > + ptn->mode = state->mode; > > + > > + if (state->alt) > > + ptn->svid = state->alt->svid; > > + else > > + ptn->svid = 0; // No SVID > > + > > + ret = ptn36502_set(ptn); > > + } > > + > > + mutex_unlock(&ptn->lock); > > + > > + return ret; > > +} > > + > > +static int ptn36502_detect(struct ptn36502 *ptn) > > +{ > > + struct device *dev = &ptn->client->dev; > > + unsigned int reg_val; > > + int ret; > > + > > + ret = regmap_read(ptn->regmap, PTN36502_CHIP_ID_REG, > > + ®_val); > > + if (ret < 0) > > + return dev_err_probe(dev, ret, "Failed to read chip ID\n"); > > + > > + if (reg_val != PTN36502_CHIP_ID) > > + return dev_err_probe(dev, -ENODEV, "Unexpected chip ID: %x\n", reg_val); > > + > > + ret = regmap_read(ptn->regmap, PTN36502_CHIP_REVISION_REG, > > + ®_val); > > + if (ret < 0) > > + return dev_err_probe(dev, ret, "Failed to read chip revision\n"); > > + > > + dev_dbg(dev, "Chip revision: base layer version %lx, metal layer version %lx\n", > > + PTN36502_CHIP_REVISION_BASE(reg_val), > > + PTN36502_CHIP_REVISION_METAL(reg_val)); > > + > > + return 0; > > +} > > + > > +#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_PANEL_BRIDGE) > > +static int ptn36502_bridge_attach(struct drm_bridge *bridge, > > + enum drm_bridge_attach_flags flags) > > I applied this patch and realised that that's not correctly aligned. > There are couple of extra spaces. > > > +{ > > + struct ptn36502 *ptn = container_of(bridge, struct ptn36502, bridge); > > + struct drm_bridge *next_bridge; > > + > > + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) > > + return -EINVAL; > > + > > + next_bridge = devm_drm_of_get_bridge(&ptn->client->dev, ptn->client->dev.of_node, 0, 0); > > + if (IS_ERR(next_bridge)) { > > + dev_err(&ptn->client->dev, "failed to acquire drm_bridge: %pe\n", next_bridge); > > + return PTR_ERR(next_bridge); > > + } > > + > > + return drm_bridge_attach(bridge->encoder, next_bridge, bridge, > > + DRM_BRIDGE_ATTACH_NO_CONNECTOR); > > +} > > + > > +static const struct drm_bridge_funcs ptn36502_bridge_funcs = { > > + .attach = ptn36502_bridge_attach, > > +}; > > + > > +static int ptn36502_register_bridge(struct ptn36502 *ptn) > > +{ > > + ptn->bridge.funcs = &ptn36502_bridge_funcs; > > + ptn->bridge.of_node = ptn->client->dev.of_node; > > + > > + return devm_drm_bridge_add(&ptn->client->dev, &ptn->bridge); > > +} > > +#else > > +static int ptn36502_register_bridge(struct ptn36502 *ptn) > > +{ > > + return 0; > > +} > > +#endif > > + > > +static const struct regmap_config ptn36502_regmap = { > > + .max_register = 0x0d, > > + .reg_bits = 8, > > + .val_bits = 8, > > +}; > > + > > +static int ptn36502_probe(struct i2c_client *client) > > +{ > > + struct device *dev = &client->dev; > > + struct typec_switch_desc sw_desc = { }; > > + struct typec_retimer_desc retimer_desc = { }; > > + struct ptn36502 *ptn; > > + int ret; > > + > > + ptn = devm_kzalloc(dev, sizeof(*ptn), GFP_KERNEL); > > + if (!ptn) > > + return -ENOMEM; > > + > > + ptn->client = client; > > + > > + ptn->regmap = devm_regmap_init_i2c(client, &ptn36502_regmap); > > + if (IS_ERR(ptn->regmap)) { > > + dev_err(&client->dev, "Failed to allocate register map\n"); > > + return PTR_ERR(ptn->regmap); > > + } > > + > > + ptn->mode = TYPEC_STATE_SAFE; > > + ptn->orientation = TYPEC_ORIENTATION_NONE; > > + > > + mutex_init(&ptn->lock); > > + > > + ptn->vdd18_supply = devm_regulator_get_optional(dev, "vdd18"); > > + if (IS_ERR(ptn->vdd18_supply)) > > + return PTR_ERR(ptn->vdd18_supply); > > + > > + ptn->typec_switch = fwnode_typec_switch_get(dev->fwnode); > > + if (IS_ERR(ptn->typec_switch)) > > + return dev_err_probe(dev, PTR_ERR(ptn->typec_switch), > > + "Failed to acquire orientation-switch\n"); > > + > > + ret = regulator_enable(ptn->vdd18_supply); > > + if (ret) > > + return dev_err_probe(dev, ret, "Failed to enable vdd18\n"); > > + > > + ret = ptn36502_detect(ptn); > > + if (ret) > > + goto err_disable_regulator; > > + > > + ret = ptn36502_register_bridge(ptn); > > + if (ret) > > + goto err_disable_regulator; > > + > > + sw_desc.drvdata = ptn; > > + sw_desc.fwnode = dev->fwnode; > > + sw_desc.set = ptn36502_sw_set; > > + > > + ptn->sw = typec_switch_register(dev, &sw_desc); > > + if (IS_ERR(ptn->sw)) { > > + ret = dev_err_probe(dev, PTR_ERR(ptn->sw), > > + "Failed to register typec switch\n"); > > + goto err_disable_regulator; > > + } > > + > > + retimer_desc.drvdata = ptn; > > + retimer_desc.fwnode = dev->fwnode; > > + retimer_desc.set = ptn36502_retimer_set; > > + > > + ptn->retimer = typec_retimer_register(dev, &retimer_desc); > > + if (IS_ERR(ptn->retimer)) { > > + ret = dev_err_probe(dev, PTR_ERR(ptn->retimer), > > + "Failed to register typec retimer\n"); > > + goto err_switch_unregister; > > + } > > + > > + return 0; > > + > > +err_switch_unregister: > > + typec_switch_unregister(ptn->sw); > > + > > +err_disable_regulator: > > + regulator_disable(ptn->vdd18_supply); > > + > > + return ret; > > +} > > + > > +static void ptn36502_remove(struct i2c_client *client) > > +{ > > + struct ptn36502 *ptn = i2c_get_clientdata(client); > > + > > + typec_retimer_unregister(ptn->retimer); > > + typec_switch_unregister(ptn->sw); > > + > > + regulator_disable(ptn->vdd18_supply); > > +} > > + > > +static const struct i2c_device_id ptn36502_table[] = { > > + { "ptn36502" }, > > + { } > > +}; > > +MODULE_DEVICE_TABLE(i2c, ptn36502_table); > > + > > +static const struct of_device_id ptn36502_of_table[] = { > > + { .compatible = "nxp,ptn36502" }, > > + { } > > +}; > > +MODULE_DEVICE_TABLE(of, ptn36502_of_table); > > + > > +static struct i2c_driver ptn36502_driver = { > > + .driver = { > > + .name = "ptn36502", > > + .of_match_table = ptn36502_of_table, > > + }, > > + .probe = ptn36502_probe, > > + .remove = ptn36502_remove, > > + .id_table = ptn36502_table, > > +}; > > +module_i2c_driver(ptn36502_driver); > > + > > +MODULE_AUTHOR("Luca Weiss <luca.weiss@fairphone.com>"); > > +MODULE_DESCRIPTION("NXP PTN36502 Type-C driver"); > > +MODULE_LICENSE("GPL"); > > thanks,
On 20/10/2023 08:13, Luca Weiss wrote: > On Tue Oct 17, 2023 at 10:34 AM CEST, Heikki Krogerus wrote: >> Hi, >> >> On Fri, Oct 13, 2023 at 04:24:48PM +0200, Luca Weiss wrote: >>> Add a driver for the NXP PTN36502 Type-C USB 3.1 Gen 1 and DisplayPort >>> v1.2 combo redriver. >>> >>> Signed-off-by: Luca Weiss <luca.weiss@fairphone.com> >> >> Looks OK to me, but couple of nitpicks below. With those fixed: >> >> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> >> >>> --- >>> drivers/usb/typec/mux/Kconfig | 10 + >>> drivers/usb/typec/mux/Makefile | 1 + >>> drivers/usb/typec/mux/ptn36502.c | 421 +++++++++++++++++++++++++++++++++++++++ >>> 3 files changed, 432 insertions(+) >>> >>> diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig >>> index 65da61150ba7..816b9bd08355 100644 >>> --- a/drivers/usb/typec/mux/Kconfig >>> +++ b/drivers/usb/typec/mux/Kconfig >>> @@ -46,4 +46,14 @@ config TYPEC_MUX_NB7VPQ904M >>> Say Y or M if your system has a On Semiconductor NB7VPQ904M Type-C >>> redriver chip found on some devices with a Type-C port. >>> >>> +config TYPEC_MUX_PTN36502 >>> + tristate "NXP PTN36502 Type-C redriver driver" >>> + depends on I2C >>> + depends on DRM || DRM=n >>> + select DRM_PANEL_BRIDGE if DRM >>> + select REGMAP_I2C >>> + help >>> + Say Y or M if your system has a NXP PTN36502 Type-C redriver chip >>> + found on some devices with a Type-C port. >>> + >>> endmenu >>> diff --git a/drivers/usb/typec/mux/Makefile b/drivers/usb/typec/mux/Makefile >>> index 76196096ef41..9d6a5557b0bd 100644 >>> --- a/drivers/usb/typec/mux/Makefile >>> +++ b/drivers/usb/typec/mux/Makefile >>> @@ -5,3 +5,4 @@ obj-$(CONFIG_TYPEC_MUX_GPIO_SBU) += gpio-sbu-mux.o >>> obj-$(CONFIG_TYPEC_MUX_PI3USB30532) += pi3usb30532.o >>> obj-$(CONFIG_TYPEC_MUX_INTEL_PMC) += intel_pmc_mux.o >>> obj-$(CONFIG_TYPEC_MUX_NB7VPQ904M) += nb7vpq904m.o >>> +obj-$(CONFIG_TYPEC_MUX_PTN36502) += ptn36502.o >>> diff --git a/drivers/usb/typec/mux/ptn36502.c b/drivers/usb/typec/mux/ptn36502.c >>> new file mode 100644 >>> index 000000000000..91684a856f3a >>> --- /dev/null >>> +++ b/drivers/usb/typec/mux/ptn36502.c >>> @@ -0,0 +1,421 @@ >>> +// SPDX-License-Identifier: GPL-2.0+ >>> +/* >>> + * NXP PTN36502 Type-C driver >>> + * >>> + * Copyright (C) 2023 Luca Weiss <luca.weiss@fairphone.com> >>> + * >>> + * Based on NB7VPQ904M driver: >>> + * Copyright (C) 2023 Dmitry Baryshkov <dmitry.baryshkov@linaro.org> >>> + */ >>> + >>> +#include <drm/drm_bridge.h> >>> +#include <linux/bitfield.h> >>> +#include <linux/i2c.h> >>> +#include <linux/kernel.h> >>> +#include <linux/module.h> >>> +#include <linux/mutex.h> >>> +#include <linux/of_graph.h> >>> +#include <linux/regmap.h> >>> +#include <linux/regulator/consumer.h> >>> +#include <linux/usb/typec_dp.h> >>> +#include <linux/usb/typec_mux.h> >>> +#include <linux/usb/typec_retimer.h> >>> + >>> +#define PTN36502_CHIP_ID_REG 0x00 >>> +#define PTN36502_CHIP_ID 0x02 >>> + >>> +#define PTN36502_CHIP_REVISION_REG 0x01 >>> +#define PTN36502_CHIP_REVISION_BASE(val) FIELD_GET(GENMASK(7, 4), (val)) >>> +#define PTN36502_CHIP_REVISION_METAL(val) FIELD_GET(GENMASK(3, 0), (val)) >>> + >>> +#define PTN36502_DP_LINK_CTRL_REG 0x06 >>> +#define PTN36502_DP_LINK_CTRL_LANES_2 (2 << 2) >>> +#define PTN36502_DP_LINK_CTRL_LANES_4 (3 << 2) >>> +#define PTN36502_DP_LINK_CTRL_LINK_RATE_5_4GBPS (2 << 0) >>> + >>> +/* Registers for lane 0 (0x07) to lane 3 (0x0a) have the same layout */ >>> +#define PTN36502_DP_LANE_CTRL_REG(n) (0x07 + (n)) >>> +#define PTN36502_DP_LANE_CTRL_RX_GAIN_3DB (2<<4) >>> +#define PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD (2<<2) >>> +#define PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB (1<<0) >>> + >>> +#define PTN36502_MODE_CTRL1_REG 0x0b >>> +#define PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE (1<<5) >>> +#define PTN36502_MODE_CTRL1_AUX_CROSSBAR_SW_ON (1<<3) >>> +#define PTN36502_MODE_CTRL1_MODE_OFF (0<<0) >>> +#define PTN36502_MODE_CTRL1_MODE_USB_ONLY (1<<0) >>> +#define PTN36502_MODE_CTRL1_MODE_USB_DP (2<<0) >>> +#define PTN36502_MODE_CTRL1_MODE_DP (3<<0) >>> + >>> +#define PTN36502_DEVICE_CTRL_REG 0x0d >>> +#define PTN36502_DEVICE_CTRL_AUX_MONITORING_EN (1<<7) >> >> You have couple of different styles here. Please try to always use >> BIT() and GENMASK() macros when possible. At the very least put spaces >> around << and >>. > > Hi Heikki, > > I was wondering when writing that whether GENMASK was actually proper > use for values you write to registers, when not actually used as a > bitmask. > > Since the datasheet refers to e.g. with TX_SWING_800MVPPD (2<<2) that > you write a '2' to the correct bits of this register. But when using > BIT(3) kind of hides this relationship if someone refers back to the > datasheet. Or same with "3<<2" -> GENMASK(3, 2) or whatever. The proper way is to define the MASK for the field GENMASK(3, 2) and then use FIELD_PREP(GENMASK(3, 2), 2) to write 2 in this field. You could replace with: #define PTN36502_DP_LANE_CTRL_TX_SWING_MASK GENMASK(3, 2) #define PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD (2) and in the code lane_ctrl_val = FIELD_PREP(PTN36502_DP_LANE_CTRL_RX_GAIN_MASK, PTN36502_DP_LANE_CTRL_RX_GAIN_3DB) | FIELD_PREP(PTN36502_DP_LANE_CTRL_TX_SWING_MASK, PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD) | FIELD_PREP(PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_MASK, PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB); It's a little more verbose but it's much clearer and defines stuff correctly, no confusion possible. Neil > > Let me know what you think. > > Regards > Luca > >> >>> +struct ptn36502 { >>> + struct i2c_client *client; >>> + struct regulator *vdd18_supply; >>> + struct regmap *regmap; >>> + struct typec_switch_dev *sw; >>> + struct typec_retimer *retimer; >>> + >>> + struct typec_switch *typec_switch; >>> + >>> + struct drm_bridge bridge; >>> + >>> + struct mutex lock; /* protect non-concurrent retimer & switch */ >>> + >>> + enum typec_orientation orientation; >>> + unsigned long mode; >>> + unsigned int svid; >>> +}; >>> + >>> +static int ptn36502_set(struct ptn36502 *ptn) >>> +{ >>> + bool reverse = (ptn->orientation == TYPEC_ORIENTATION_REVERSE); >>> + unsigned int ctrl1_val = 0; >>> + unsigned int lane_ctrl_val = 0; >>> + unsigned int link_ctrl_val = 0; >>> + >>> + switch (ptn->mode) { >>> + case TYPEC_STATE_SAFE: >>> + /* Deep power saving state */ >>> + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, >>> + PTN36502_MODE_CTRL1_MODE_OFF); >>> + return 0; >>> + >>> + case TYPEC_STATE_USB: >>> + /* >>> + * Normal Orientation (CC1) >>> + * A -> USB RX >>> + * B -> USB TX >>> + * C -> X >>> + * D -> X >>> + * Flipped Orientation (CC2) >>> + * A -> X >>> + * B -> X >>> + * C -> USB TX >>> + * D -> USB RX >>> + */ >>> + >>> + /* USB 3.1 Gen 1 only */ >>> + ctrl1_val = PTN36502_MODE_CTRL1_MODE_USB_ONLY; >>> + if (reverse) >>> + ctrl1_val |= PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE; >>> + >>> + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, ctrl1_val); >>> + return 0; >>> + >>> + default: >>> + if (ptn->svid != USB_TYPEC_DP_SID) >>> + return -EINVAL; >>> + >>> + break; >>> + } >>> + >>> + /* DP Altmode Setup */ >>> + >>> + switch (ptn->mode) { >>> + case TYPEC_DP_STATE_C: >>> + case TYPEC_DP_STATE_E: >>> + /* >>> + * Normal Orientation (CC1) >>> + * A -> DP3 >>> + * B -> DP2 >>> + * C -> DP1 >>> + * D -> DP0 >>> + * Flipped Orientation (CC2) >>> + * A -> DP0 >>> + * B -> DP1 >>> + * C -> DP2 >>> + * D -> DP3 >>> + */ >>> + >>> + /* 4-lane DP */ >>> + ctrl1_val |= PTN36502_MODE_CTRL1_MODE_DP; >>> + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LANES_4; >>> + break; >>> + >>> + case TYPEC_DP_STATE_D: >>> + case TYPEC_DP_STATE_F: /* State F is deprecated */ >>> + /* >>> + * Normal Orientation (CC1) >>> + * A -> USB RX >>> + * B -> USB TX >>> + * C -> DP1 >>> + * D -> DP0 >>> + * Flipped Orientation (CC2) >>> + * A -> DP0 >>> + * B -> DP1 >>> + * C -> USB TX >>> + * D -> USB RX >>> + */ >>> + >>> + /* USB 3.1 Gen 1 and 2-lane DP */ >>> + ctrl1_val |= PTN36502_MODE_CTRL1_MODE_USB_DP; >>> + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LANES_2; >>> + break; >>> + >>> + default: >>> + return -EOPNOTSUPP; >>> + } >>> + >>> + /* Enable AUX monitoring */ >>> + regmap_write(ptn->regmap, PTN36502_DEVICE_CTRL_REG, >>> + PTN36502_DEVICE_CTRL_AUX_MONITORING_EN); >>> + >>> + /* Enable AUX switch path */ >>> + ctrl1_val |= PTN36502_MODE_CTRL1_AUX_CROSSBAR_SW_ON; >>> + if (reverse) >>> + ctrl1_val |= PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE; >>> + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, ctrl1_val); >>> + >>> + /* DP Link rate: 5.4 Gbps (HBR2) */ >>> + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LINK_RATE_5_4GBPS; >>> + regmap_write(ptn->regmap, PTN36502_DP_LINK_CTRL_REG, link_ctrl_val); >>> + >>> + /* >>> + * For all lanes: >>> + * - Rx equivalization gain: 3 dB >>> + * - TX output swing control: 800 mVppd >>> + * - Pre-emphasis control: 3.5 dB >>> + */ >>> + lane_ctrl_val = PTN36502_DP_LANE_CTRL_RX_GAIN_3DB | >>> + PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD | >>> + PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB; >>> + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(0), lane_ctrl_val); >>> + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(1), lane_ctrl_val); >>> + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(2), lane_ctrl_val); >>> + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(3), lane_ctrl_val); >>> + >>> + return 0; >>> +} >>> + >>> +static int ptn36502_sw_set(struct typec_switch_dev *sw, enum typec_orientation orientation) >>> +{ >>> + struct ptn36502 *ptn = typec_switch_get_drvdata(sw); >>> + int ret; >>> + >>> + ret = typec_switch_set(ptn->typec_switch, orientation); >>> + if (ret) >>> + return ret; >>> + >>> + mutex_lock(&ptn->lock); >>> + >>> + if (ptn->orientation != orientation) { >>> + ptn->orientation = orientation; >>> + >>> + ret = ptn36502_set(ptn); >>> + } >>> + >>> + mutex_unlock(&ptn->lock); >>> + >>> + return ret; >>> +} >>> + >>> +static int ptn36502_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state) >>> +{ >>> + struct ptn36502 *ptn = typec_retimer_get_drvdata(retimer); >>> + int ret = 0; >>> + >>> + mutex_lock(&ptn->lock); >>> + >>> + if (ptn->mode != state->mode) { >>> + ptn->mode = state->mode; >>> + >>> + if (state->alt) >>> + ptn->svid = state->alt->svid; >>> + else >>> + ptn->svid = 0; // No SVID >>> + >>> + ret = ptn36502_set(ptn); >>> + } >>> + >>> + mutex_unlock(&ptn->lock); >>> + >>> + return ret; >>> +} >>> + >>> +static int ptn36502_detect(struct ptn36502 *ptn) >>> +{ >>> + struct device *dev = &ptn->client->dev; >>> + unsigned int reg_val; >>> + int ret; >>> + >>> + ret = regmap_read(ptn->regmap, PTN36502_CHIP_ID_REG, >>> + ®_val); >>> + if (ret < 0) >>> + return dev_err_probe(dev, ret, "Failed to read chip ID\n"); >>> + >>> + if (reg_val != PTN36502_CHIP_ID) >>> + return dev_err_probe(dev, -ENODEV, "Unexpected chip ID: %x\n", reg_val); >>> + >>> + ret = regmap_read(ptn->regmap, PTN36502_CHIP_REVISION_REG, >>> + ®_val); >>> + if (ret < 0) >>> + return dev_err_probe(dev, ret, "Failed to read chip revision\n"); >>> + >>> + dev_dbg(dev, "Chip revision: base layer version %lx, metal layer version %lx\n", >>> + PTN36502_CHIP_REVISION_BASE(reg_val), >>> + PTN36502_CHIP_REVISION_METAL(reg_val)); >>> + >>> + return 0; >>> +} >>> + >>> +#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_PANEL_BRIDGE) >>> +static int ptn36502_bridge_attach(struct drm_bridge *bridge, >>> + enum drm_bridge_attach_flags flags) >> >> I applied this patch and realised that that's not correctly aligned. >> There are couple of extra spaces. >> >>> +{ >>> + struct ptn36502 *ptn = container_of(bridge, struct ptn36502, bridge); >>> + struct drm_bridge *next_bridge; >>> + >>> + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) >>> + return -EINVAL; >>> + >>> + next_bridge = devm_drm_of_get_bridge(&ptn->client->dev, ptn->client->dev.of_node, 0, 0); >>> + if (IS_ERR(next_bridge)) { >>> + dev_err(&ptn->client->dev, "failed to acquire drm_bridge: %pe\n", next_bridge); >>> + return PTR_ERR(next_bridge); >>> + } >>> + >>> + return drm_bridge_attach(bridge->encoder, next_bridge, bridge, >>> + DRM_BRIDGE_ATTACH_NO_CONNECTOR); >>> +} >>> + >>> +static const struct drm_bridge_funcs ptn36502_bridge_funcs = { >>> + .attach = ptn36502_bridge_attach, >>> +}; >>> + >>> +static int ptn36502_register_bridge(struct ptn36502 *ptn) >>> +{ >>> + ptn->bridge.funcs = &ptn36502_bridge_funcs; >>> + ptn->bridge.of_node = ptn->client->dev.of_node; >>> + >>> + return devm_drm_bridge_add(&ptn->client->dev, &ptn->bridge); >>> +} >>> +#else >>> +static int ptn36502_register_bridge(struct ptn36502 *ptn) >>> +{ >>> + return 0; >>> +} >>> +#endif >>> + >>> +static const struct regmap_config ptn36502_regmap = { >>> + .max_register = 0x0d, >>> + .reg_bits = 8, >>> + .val_bits = 8, >>> +}; >>> + >>> +static int ptn36502_probe(struct i2c_client *client) >>> +{ >>> + struct device *dev = &client->dev; >>> + struct typec_switch_desc sw_desc = { }; >>> + struct typec_retimer_desc retimer_desc = { }; >>> + struct ptn36502 *ptn; >>> + int ret; >>> + >>> + ptn = devm_kzalloc(dev, sizeof(*ptn), GFP_KERNEL); >>> + if (!ptn) >>> + return -ENOMEM; >>> + >>> + ptn->client = client; >>> + >>> + ptn->regmap = devm_regmap_init_i2c(client, &ptn36502_regmap); >>> + if (IS_ERR(ptn->regmap)) { >>> + dev_err(&client->dev, "Failed to allocate register map\n"); >>> + return PTR_ERR(ptn->regmap); >>> + } >>> + >>> + ptn->mode = TYPEC_STATE_SAFE; >>> + ptn->orientation = TYPEC_ORIENTATION_NONE; >>> + >>> + mutex_init(&ptn->lock); >>> + >>> + ptn->vdd18_supply = devm_regulator_get_optional(dev, "vdd18"); >>> + if (IS_ERR(ptn->vdd18_supply)) >>> + return PTR_ERR(ptn->vdd18_supply); >>> + >>> + ptn->typec_switch = fwnode_typec_switch_get(dev->fwnode); >>> + if (IS_ERR(ptn->typec_switch)) >>> + return dev_err_probe(dev, PTR_ERR(ptn->typec_switch), >>> + "Failed to acquire orientation-switch\n"); >>> + >>> + ret = regulator_enable(ptn->vdd18_supply); >>> + if (ret) >>> + return dev_err_probe(dev, ret, "Failed to enable vdd18\n"); >>> + >>> + ret = ptn36502_detect(ptn); >>> + if (ret) >>> + goto err_disable_regulator; >>> + >>> + ret = ptn36502_register_bridge(ptn); >>> + if (ret) >>> + goto err_disable_regulator; >>> + >>> + sw_desc.drvdata = ptn; >>> + sw_desc.fwnode = dev->fwnode; >>> + sw_desc.set = ptn36502_sw_set; >>> + >>> + ptn->sw = typec_switch_register(dev, &sw_desc); >>> + if (IS_ERR(ptn->sw)) { >>> + ret = dev_err_probe(dev, PTR_ERR(ptn->sw), >>> + "Failed to register typec switch\n"); >>> + goto err_disable_regulator; >>> + } >>> + >>> + retimer_desc.drvdata = ptn; >>> + retimer_desc.fwnode = dev->fwnode; >>> + retimer_desc.set = ptn36502_retimer_set; >>> + >>> + ptn->retimer = typec_retimer_register(dev, &retimer_desc); >>> + if (IS_ERR(ptn->retimer)) { >>> + ret = dev_err_probe(dev, PTR_ERR(ptn->retimer), >>> + "Failed to register typec retimer\n"); >>> + goto err_switch_unregister; >>> + } >>> + >>> + return 0; >>> + >>> +err_switch_unregister: >>> + typec_switch_unregister(ptn->sw); >>> + >>> +err_disable_regulator: >>> + regulator_disable(ptn->vdd18_supply); >>> + >>> + return ret; >>> +} >>> + >>> +static void ptn36502_remove(struct i2c_client *client) >>> +{ >>> + struct ptn36502 *ptn = i2c_get_clientdata(client); >>> + >>> + typec_retimer_unregister(ptn->retimer); >>> + typec_switch_unregister(ptn->sw); >>> + >>> + regulator_disable(ptn->vdd18_supply); >>> +} >>> + >>> +static const struct i2c_device_id ptn36502_table[] = { >>> + { "ptn36502" }, >>> + { } >>> +}; >>> +MODULE_DEVICE_TABLE(i2c, ptn36502_table); >>> + >>> +static const struct of_device_id ptn36502_of_table[] = { >>> + { .compatible = "nxp,ptn36502" }, >>> + { } >>> +}; >>> +MODULE_DEVICE_TABLE(of, ptn36502_of_table); >>> + >>> +static struct i2c_driver ptn36502_driver = { >>> + .driver = { >>> + .name = "ptn36502", >>> + .of_match_table = ptn36502_of_table, >>> + }, >>> + .probe = ptn36502_probe, >>> + .remove = ptn36502_remove, >>> + .id_table = ptn36502_table, >>> +}; >>> +module_i2c_driver(ptn36502_driver); >>> + >>> +MODULE_AUTHOR("Luca Weiss <luca.weiss@fairphone.com>"); >>> +MODULE_DESCRIPTION("NXP PTN36502 Type-C driver"); >>> +MODULE_LICENSE("GPL"); >> >> thanks, >
On Fri Oct 20, 2023 at 9:18 AM CEST, Neil Armstrong wrote: > On 20/10/2023 08:13, Luca Weiss wrote: > > On Tue Oct 17, 2023 at 10:34 AM CEST, Heikki Krogerus wrote: > >> Hi, > >> > >> On Fri, Oct 13, 2023 at 04:24:48PM +0200, Luca Weiss wrote: > >>> Add a driver for the NXP PTN36502 Type-C USB 3.1 Gen 1 and DisplayPort > >>> v1.2 combo redriver. > >>> > >>> Signed-off-by: Luca Weiss <luca.weiss@fairphone.com> > >> > >> Looks OK to me, but couple of nitpicks below. With those fixed: > >> > >> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > >> > >>> --- > >>> drivers/usb/typec/mux/Kconfig | 10 + > >>> drivers/usb/typec/mux/Makefile | 1 + > >>> drivers/usb/typec/mux/ptn36502.c | 421 +++++++++++++++++++++++++++++++++++++++ > >>> 3 files changed, 432 insertions(+) > >>> [snip] > >>> +#define PTN36502_CHIP_ID_REG 0x00 > >>> +#define PTN36502_CHIP_ID 0x02 > >>> + > >>> +#define PTN36502_CHIP_REVISION_REG 0x01 > >>> +#define PTN36502_CHIP_REVISION_BASE(val) FIELD_GET(GENMASK(7, 4), (val)) > >>> +#define PTN36502_CHIP_REVISION_METAL(val) FIELD_GET(GENMASK(3, 0), (val)) > >>> + > >>> +#define PTN36502_DP_LINK_CTRL_REG 0x06 > >>> +#define PTN36502_DP_LINK_CTRL_LANES_2 (2 << 2) > >>> +#define PTN36502_DP_LINK_CTRL_LANES_4 (3 << 2) > >>> +#define PTN36502_DP_LINK_CTRL_LINK_RATE_5_4GBPS (2 << 0) > >>> + > >>> +/* Registers for lane 0 (0x07) to lane 3 (0x0a) have the same layout */ > >>> +#define PTN36502_DP_LANE_CTRL_REG(n) (0x07 + (n)) > >>> +#define PTN36502_DP_LANE_CTRL_RX_GAIN_3DB (2<<4) > >>> +#define PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD (2<<2) > >>> +#define PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB (1<<0) > >>> + > >>> +#define PTN36502_MODE_CTRL1_REG 0x0b > >>> +#define PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE (1<<5) > >>> +#define PTN36502_MODE_CTRL1_AUX_CROSSBAR_SW_ON (1<<3) > >>> +#define PTN36502_MODE_CTRL1_MODE_OFF (0<<0) > >>> +#define PTN36502_MODE_CTRL1_MODE_USB_ONLY (1<<0) > >>> +#define PTN36502_MODE_CTRL1_MODE_USB_DP (2<<0) > >>> +#define PTN36502_MODE_CTRL1_MODE_DP (3<<0) > >>> + > >>> +#define PTN36502_DEVICE_CTRL_REG 0x0d > >>> +#define PTN36502_DEVICE_CTRL_AUX_MONITORING_EN (1<<7) > >> > >> You have couple of different styles here. Please try to always use > >> BIT() and GENMASK() macros when possible. At the very least put spaces > >> around << and >>. > > > > Hi Heikki, > > > > I was wondering when writing that whether GENMASK was actually proper > > use for values you write to registers, when not actually used as a > > bitmask. > > > > Since the datasheet refers to e.g. with TX_SWING_800MVPPD (2<<2) that > > you write a '2' to the correct bits of this register. But when using > > BIT(3) kind of hides this relationship if someone refers back to the > > datasheet. Or same with "3<<2" -> GENMASK(3, 2) or whatever. > > The proper way is to define the MASK for the field GENMASK(3, 2) and then > use FIELD_PREP(GENMASK(3, 2), 2) to write 2 in this field. > > You could replace with: > #define PTN36502_DP_LANE_CTRL_TX_SWING_MASK GENMASK(3, 2) > #define PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD (2) > > and in the code > lane_ctrl_val = FIELD_PREP(PTN36502_DP_LANE_CTRL_RX_GAIN_MASK, > PTN36502_DP_LANE_CTRL_RX_GAIN_3DB) | > FIELD_PREP(PTN36502_DP_LANE_CTRL_TX_SWING_MASK, > PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD) | > FIELD_PREP(PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_MASK, > PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB); > > It's a little more verbose but it's much clearer and defines stuff correctly, > no confusion possible. Thanks for the advise, I'll update for v2! Regards Luca
diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig index 65da61150ba7..816b9bd08355 100644 --- a/drivers/usb/typec/mux/Kconfig +++ b/drivers/usb/typec/mux/Kconfig @@ -46,4 +46,14 @@ config TYPEC_MUX_NB7VPQ904M Say Y or M if your system has a On Semiconductor NB7VPQ904M Type-C redriver chip found on some devices with a Type-C port. +config TYPEC_MUX_PTN36502 + tristate "NXP PTN36502 Type-C redriver driver" + depends on I2C + depends on DRM || DRM=n + select DRM_PANEL_BRIDGE if DRM + select REGMAP_I2C + help + Say Y or M if your system has a NXP PTN36502 Type-C redriver chip + found on some devices with a Type-C port. + endmenu diff --git a/drivers/usb/typec/mux/Makefile b/drivers/usb/typec/mux/Makefile index 76196096ef41..9d6a5557b0bd 100644 --- a/drivers/usb/typec/mux/Makefile +++ b/drivers/usb/typec/mux/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_TYPEC_MUX_GPIO_SBU) += gpio-sbu-mux.o obj-$(CONFIG_TYPEC_MUX_PI3USB30532) += pi3usb30532.o obj-$(CONFIG_TYPEC_MUX_INTEL_PMC) += intel_pmc_mux.o obj-$(CONFIG_TYPEC_MUX_NB7VPQ904M) += nb7vpq904m.o +obj-$(CONFIG_TYPEC_MUX_PTN36502) += ptn36502.o diff --git a/drivers/usb/typec/mux/ptn36502.c b/drivers/usb/typec/mux/ptn36502.c new file mode 100644 index 000000000000..91684a856f3a --- /dev/null +++ b/drivers/usb/typec/mux/ptn36502.c @@ -0,0 +1,421 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * NXP PTN36502 Type-C driver + * + * Copyright (C) 2023 Luca Weiss <luca.weiss@fairphone.com> + * + * Based on NB7VPQ904M driver: + * Copyright (C) 2023 Dmitry Baryshkov <dmitry.baryshkov@linaro.org> + */ + +#include <drm/drm_bridge.h> +#include <linux/bitfield.h> +#include <linux/i2c.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of_graph.h> +#include <linux/regmap.h> +#include <linux/regulator/consumer.h> +#include <linux/usb/typec_dp.h> +#include <linux/usb/typec_mux.h> +#include <linux/usb/typec_retimer.h> + +#define PTN36502_CHIP_ID_REG 0x00 +#define PTN36502_CHIP_ID 0x02 + +#define PTN36502_CHIP_REVISION_REG 0x01 +#define PTN36502_CHIP_REVISION_BASE(val) FIELD_GET(GENMASK(7, 4), (val)) +#define PTN36502_CHIP_REVISION_METAL(val) FIELD_GET(GENMASK(3, 0), (val)) + +#define PTN36502_DP_LINK_CTRL_REG 0x06 +#define PTN36502_DP_LINK_CTRL_LANES_2 (2 << 2) +#define PTN36502_DP_LINK_CTRL_LANES_4 (3 << 2) +#define PTN36502_DP_LINK_CTRL_LINK_RATE_5_4GBPS (2 << 0) + +/* Registers for lane 0 (0x07) to lane 3 (0x0a) have the same layout */ +#define PTN36502_DP_LANE_CTRL_REG(n) (0x07 + (n)) +#define PTN36502_DP_LANE_CTRL_RX_GAIN_3DB (2<<4) +#define PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD (2<<2) +#define PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB (1<<0) + +#define PTN36502_MODE_CTRL1_REG 0x0b +#define PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE (1<<5) +#define PTN36502_MODE_CTRL1_AUX_CROSSBAR_SW_ON (1<<3) +#define PTN36502_MODE_CTRL1_MODE_OFF (0<<0) +#define PTN36502_MODE_CTRL1_MODE_USB_ONLY (1<<0) +#define PTN36502_MODE_CTRL1_MODE_USB_DP (2<<0) +#define PTN36502_MODE_CTRL1_MODE_DP (3<<0) + +#define PTN36502_DEVICE_CTRL_REG 0x0d +#define PTN36502_DEVICE_CTRL_AUX_MONITORING_EN (1<<7) + +struct ptn36502 { + struct i2c_client *client; + struct regulator *vdd18_supply; + struct regmap *regmap; + struct typec_switch_dev *sw; + struct typec_retimer *retimer; + + struct typec_switch *typec_switch; + + struct drm_bridge bridge; + + struct mutex lock; /* protect non-concurrent retimer & switch */ + + enum typec_orientation orientation; + unsigned long mode; + unsigned int svid; +}; + +static int ptn36502_set(struct ptn36502 *ptn) +{ + bool reverse = (ptn->orientation == TYPEC_ORIENTATION_REVERSE); + unsigned int ctrl1_val = 0; + unsigned int lane_ctrl_val = 0; + unsigned int link_ctrl_val = 0; + + switch (ptn->mode) { + case TYPEC_STATE_SAFE: + /* Deep power saving state */ + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, + PTN36502_MODE_CTRL1_MODE_OFF); + return 0; + + case TYPEC_STATE_USB: + /* + * Normal Orientation (CC1) + * A -> USB RX + * B -> USB TX + * C -> X + * D -> X + * Flipped Orientation (CC2) + * A -> X + * B -> X + * C -> USB TX + * D -> USB RX + */ + + /* USB 3.1 Gen 1 only */ + ctrl1_val = PTN36502_MODE_CTRL1_MODE_USB_ONLY; + if (reverse) + ctrl1_val |= PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE; + + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, ctrl1_val); + return 0; + + default: + if (ptn->svid != USB_TYPEC_DP_SID) + return -EINVAL; + + break; + } + + /* DP Altmode Setup */ + + switch (ptn->mode) { + case TYPEC_DP_STATE_C: + case TYPEC_DP_STATE_E: + /* + * Normal Orientation (CC1) + * A -> DP3 + * B -> DP2 + * C -> DP1 + * D -> DP0 + * Flipped Orientation (CC2) + * A -> DP0 + * B -> DP1 + * C -> DP2 + * D -> DP3 + */ + + /* 4-lane DP */ + ctrl1_val |= PTN36502_MODE_CTRL1_MODE_DP; + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LANES_4; + break; + + case TYPEC_DP_STATE_D: + case TYPEC_DP_STATE_F: /* State F is deprecated */ + /* + * Normal Orientation (CC1) + * A -> USB RX + * B -> USB TX + * C -> DP1 + * D -> DP0 + * Flipped Orientation (CC2) + * A -> DP0 + * B -> DP1 + * C -> USB TX + * D -> USB RX + */ + + /* USB 3.1 Gen 1 and 2-lane DP */ + ctrl1_val |= PTN36502_MODE_CTRL1_MODE_USB_DP; + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LANES_2; + break; + + default: + return -EOPNOTSUPP; + } + + /* Enable AUX monitoring */ + regmap_write(ptn->regmap, PTN36502_DEVICE_CTRL_REG, + PTN36502_DEVICE_CTRL_AUX_MONITORING_EN); + + /* Enable AUX switch path */ + ctrl1_val |= PTN36502_MODE_CTRL1_AUX_CROSSBAR_SW_ON; + if (reverse) + ctrl1_val |= PTN36502_MODE_CTRL1_PLUG_ORIENT_REVERSE; + regmap_write(ptn->regmap, PTN36502_MODE_CTRL1_REG, ctrl1_val); + + /* DP Link rate: 5.4 Gbps (HBR2) */ + link_ctrl_val |= PTN36502_DP_LINK_CTRL_LINK_RATE_5_4GBPS; + regmap_write(ptn->regmap, PTN36502_DP_LINK_CTRL_REG, link_ctrl_val); + + /* + * For all lanes: + * - Rx equivalization gain: 3 dB + * - TX output swing control: 800 mVppd + * - Pre-emphasis control: 3.5 dB + */ + lane_ctrl_val = PTN36502_DP_LANE_CTRL_RX_GAIN_3DB | + PTN36502_DP_LANE_CTRL_TX_SWING_800MVPPD | + PTN36502_DP_LANE_CTRL_PRE_EMPHASIS_3_5DB; + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(0), lane_ctrl_val); + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(1), lane_ctrl_val); + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(2), lane_ctrl_val); + regmap_write(ptn->regmap, PTN36502_DP_LANE_CTRL_REG(3), lane_ctrl_val); + + return 0; +} + +static int ptn36502_sw_set(struct typec_switch_dev *sw, enum typec_orientation orientation) +{ + struct ptn36502 *ptn = typec_switch_get_drvdata(sw); + int ret; + + ret = typec_switch_set(ptn->typec_switch, orientation); + if (ret) + return ret; + + mutex_lock(&ptn->lock); + + if (ptn->orientation != orientation) { + ptn->orientation = orientation; + + ret = ptn36502_set(ptn); + } + + mutex_unlock(&ptn->lock); + + return ret; +} + +static int ptn36502_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state) +{ + struct ptn36502 *ptn = typec_retimer_get_drvdata(retimer); + int ret = 0; + + mutex_lock(&ptn->lock); + + if (ptn->mode != state->mode) { + ptn->mode = state->mode; + + if (state->alt) + ptn->svid = state->alt->svid; + else + ptn->svid = 0; // No SVID + + ret = ptn36502_set(ptn); + } + + mutex_unlock(&ptn->lock); + + return ret; +} + +static int ptn36502_detect(struct ptn36502 *ptn) +{ + struct device *dev = &ptn->client->dev; + unsigned int reg_val; + int ret; + + ret = regmap_read(ptn->regmap, PTN36502_CHIP_ID_REG, + ®_val); + if (ret < 0) + return dev_err_probe(dev, ret, "Failed to read chip ID\n"); + + if (reg_val != PTN36502_CHIP_ID) + return dev_err_probe(dev, -ENODEV, "Unexpected chip ID: %x\n", reg_val); + + ret = regmap_read(ptn->regmap, PTN36502_CHIP_REVISION_REG, + ®_val); + if (ret < 0) + return dev_err_probe(dev, ret, "Failed to read chip revision\n"); + + dev_dbg(dev, "Chip revision: base layer version %lx, metal layer version %lx\n", + PTN36502_CHIP_REVISION_BASE(reg_val), + PTN36502_CHIP_REVISION_METAL(reg_val)); + + return 0; +} + +#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_PANEL_BRIDGE) +static int ptn36502_bridge_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + struct ptn36502 *ptn = container_of(bridge, struct ptn36502, bridge); + struct drm_bridge *next_bridge; + + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) + return -EINVAL; + + next_bridge = devm_drm_of_get_bridge(&ptn->client->dev, ptn->client->dev.of_node, 0, 0); + if (IS_ERR(next_bridge)) { + dev_err(&ptn->client->dev, "failed to acquire drm_bridge: %pe\n", next_bridge); + return PTR_ERR(next_bridge); + } + + return drm_bridge_attach(bridge->encoder, next_bridge, bridge, + DRM_BRIDGE_ATTACH_NO_CONNECTOR); +} + +static const struct drm_bridge_funcs ptn36502_bridge_funcs = { + .attach = ptn36502_bridge_attach, +}; + +static int ptn36502_register_bridge(struct ptn36502 *ptn) +{ + ptn->bridge.funcs = &ptn36502_bridge_funcs; + ptn->bridge.of_node = ptn->client->dev.of_node; + + return devm_drm_bridge_add(&ptn->client->dev, &ptn->bridge); +} +#else +static int ptn36502_register_bridge(struct ptn36502 *ptn) +{ + return 0; +} +#endif + +static const struct regmap_config ptn36502_regmap = { + .max_register = 0x0d, + .reg_bits = 8, + .val_bits = 8, +}; + +static int ptn36502_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct typec_switch_desc sw_desc = { }; + struct typec_retimer_desc retimer_desc = { }; + struct ptn36502 *ptn; + int ret; + + ptn = devm_kzalloc(dev, sizeof(*ptn), GFP_KERNEL); + if (!ptn) + return -ENOMEM; + + ptn->client = client; + + ptn->regmap = devm_regmap_init_i2c(client, &ptn36502_regmap); + if (IS_ERR(ptn->regmap)) { + dev_err(&client->dev, "Failed to allocate register map\n"); + return PTR_ERR(ptn->regmap); + } + + ptn->mode = TYPEC_STATE_SAFE; + ptn->orientation = TYPEC_ORIENTATION_NONE; + + mutex_init(&ptn->lock); + + ptn->vdd18_supply = devm_regulator_get_optional(dev, "vdd18"); + if (IS_ERR(ptn->vdd18_supply)) + return PTR_ERR(ptn->vdd18_supply); + + ptn->typec_switch = fwnode_typec_switch_get(dev->fwnode); + if (IS_ERR(ptn->typec_switch)) + return dev_err_probe(dev, PTR_ERR(ptn->typec_switch), + "Failed to acquire orientation-switch\n"); + + ret = regulator_enable(ptn->vdd18_supply); + if (ret) + return dev_err_probe(dev, ret, "Failed to enable vdd18\n"); + + ret = ptn36502_detect(ptn); + if (ret) + goto err_disable_regulator; + + ret = ptn36502_register_bridge(ptn); + if (ret) + goto err_disable_regulator; + + sw_desc.drvdata = ptn; + sw_desc.fwnode = dev->fwnode; + sw_desc.set = ptn36502_sw_set; + + ptn->sw = typec_switch_register(dev, &sw_desc); + if (IS_ERR(ptn->sw)) { + ret = dev_err_probe(dev, PTR_ERR(ptn->sw), + "Failed to register typec switch\n"); + goto err_disable_regulator; + } + + retimer_desc.drvdata = ptn; + retimer_desc.fwnode = dev->fwnode; + retimer_desc.set = ptn36502_retimer_set; + + ptn->retimer = typec_retimer_register(dev, &retimer_desc); + if (IS_ERR(ptn->retimer)) { + ret = dev_err_probe(dev, PTR_ERR(ptn->retimer), + "Failed to register typec retimer\n"); + goto err_switch_unregister; + } + + return 0; + +err_switch_unregister: + typec_switch_unregister(ptn->sw); + +err_disable_regulator: + regulator_disable(ptn->vdd18_supply); + + return ret; +} + +static void ptn36502_remove(struct i2c_client *client) +{ + struct ptn36502 *ptn = i2c_get_clientdata(client); + + typec_retimer_unregister(ptn->retimer); + typec_switch_unregister(ptn->sw); + + regulator_disable(ptn->vdd18_supply); +} + +static const struct i2c_device_id ptn36502_table[] = { + { "ptn36502" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ptn36502_table); + +static const struct of_device_id ptn36502_of_table[] = { + { .compatible = "nxp,ptn36502" }, + { } +}; +MODULE_DEVICE_TABLE(of, ptn36502_of_table); + +static struct i2c_driver ptn36502_driver = { + .driver = { + .name = "ptn36502", + .of_match_table = ptn36502_of_table, + }, + .probe = ptn36502_probe, + .remove = ptn36502_remove, + .id_table = ptn36502_table, +}; +module_i2c_driver(ptn36502_driver); + +MODULE_AUTHOR("Luca Weiss <luca.weiss@fairphone.com>"); +MODULE_DESCRIPTION("NXP PTN36502 Type-C driver"); +MODULE_LICENSE("GPL");
Add a driver for the NXP PTN36502 Type-C USB 3.1 Gen 1 and DisplayPort v1.2 combo redriver. Signed-off-by: Luca Weiss <luca.weiss@fairphone.com> --- drivers/usb/typec/mux/Kconfig | 10 + drivers/usb/typec/mux/Makefile | 1 + drivers/usb/typec/mux/ptn36502.c | 421 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 432 insertions(+)