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usb: typec: add support for the nb7vpq904m Type-C Linear Redriver
Add support for the ON Semiconductor NB7VPQ904M Type-C USB SuperSpeed and DisplayPort ALT Mode Linear Redriver chip found on some devices with a Type-C port. The redriver compensates ultra High-Speeed DisplayPort and USB Super Speed signal integrity losses mainly due to PCB & transmission cables. The redriver doesn't support SuperSpeed lines swapping, but can support Type-C SBU lines swapping. Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Message-ID: <20230601-topic-sm8x50-upstream-redriver-v4-2-91d5820f3a03@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Baryshkov
Greg Kroah-Hartman
parent
4ee94d9407
commit
88d8f3ac9c
@ -35,4 +35,12 @@ config TYPEC_MUX_INTEL_PMC
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control the USB role switch and also the multiplexer/demultiplexer
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switches used with USB Type-C Alternate Modes.
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config TYPEC_MUX_NB7VPQ904M
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tristate "On Semiconductor NB7VPQ904M Type-C redriver driver"
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depends on I2C
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select REGMAP_I2C
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help
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Say Y or M if your system has a On Semiconductor NB7VPQ904M Type-C
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redriver chip found on some devices with a Type-C port.
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endmenu
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@ -4,3 +4,4 @@ obj-$(CONFIG_TYPEC_MUX_FSA4480) += fsa4480.o
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obj-$(CONFIG_TYPEC_MUX_GPIO_SBU) += gpio-sbu-mux.o
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obj-$(CONFIG_TYPEC_MUX_PI3USB30532) += pi3usb30532.o
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obj-$(CONFIG_TYPEC_MUX_INTEL_PMC) += intel_pmc_mux.o
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obj-$(CONFIG_TYPEC_MUX_NB7VPQ904M) += nb7vpq904m.o
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529
drivers/usb/typec/mux/nb7vpq904m.c
Normal file
529
drivers/usb/typec/mux/nb7vpq904m.c
Normal file
@ -0,0 +1,529 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* OnSemi NB7VPQ904M Type-C driver
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*
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* Copyright (C) 2023 Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
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*/
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#include <linux/i2c.h>
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#include <linux/mutex.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/bitfield.h>
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#include <linux/of_graph.h>
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#include <drm/drm_bridge.h>
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#include <linux/usb/typec_dp.h>
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#include <linux/usb/typec_mux.h>
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#include <linux/usb/typec_retimer.h>
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#include <linux/gpio/consumer.h>
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#include <linux/regulator/consumer.h>
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#define NB7_CHNA 0
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#define NB7_CHNB 1
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#define NB7_CHNC 2
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#define NB7_CHND 3
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#define NB7_IS_CHAN_AD(channel) (channel == NB7_CHNA || channel == NB7_CHND)
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#define GEN_DEV_SET_REG 0x00
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#define GEN_DEV_SET_CHIP_EN BIT(0)
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#define GEN_DEV_SET_CHNA_EN BIT(4)
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#define GEN_DEV_SET_CHNB_EN BIT(5)
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#define GEN_DEV_SET_CHNC_EN BIT(6)
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#define GEN_DEV_SET_CHND_EN BIT(7)
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#define GEN_DEV_SET_OP_MODE_MASK GENMASK(3, 1)
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#define GEN_DEV_SET_OP_MODE_DP_CC2 0
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#define GEN_DEV_SET_OP_MODE_DP_CC1 1
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#define GEN_DEV_SET_OP_MODE_DP_4LANE 2
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#define GEN_DEV_SET_OP_MODE_USB 5
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#define EQ_SETTING_REG_BASE 0x01
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#define EQ_SETTING_REG(n) (EQ_SETTING_REG_BASE + (n) * 2)
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#define EQ_SETTING_MASK GENMASK(3, 1)
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#define OUTPUT_COMPRESSION_AND_POL_REG_BASE 0x02
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#define OUTPUT_COMPRESSION_AND_POL_REG(n) (OUTPUT_COMPRESSION_AND_POL_REG_BASE + (n) * 2)
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#define OUTPUT_COMPRESSION_MASK GENMASK(2, 1)
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#define FLAT_GAIN_REG_BASE 0x18
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#define FLAT_GAIN_REG(n) (FLAT_GAIN_REG_BASE + (n) * 2)
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#define FLAT_GAIN_MASK GENMASK(1, 0)
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#define LOSS_MATCH_REG_BASE 0x19
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#define LOSS_MATCH_REG(n) (LOSS_MATCH_REG_BASE + (n) * 2)
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#define LOSS_MATCH_MASK GENMASK(1, 0)
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#define AUX_CC_REG 0x09
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#define CHIP_VERSION_REG 0x17
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struct nb7vpq904m {
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struct i2c_client *client;
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struct gpio_desc *enable_gpio;
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struct regulator *vcc_supply;
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struct regmap *regmap;
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struct typec_switch_dev *sw;
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struct typec_retimer *retimer;
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bool swap_data_lanes;
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struct typec_switch *typec_switch;
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struct drm_bridge bridge;
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struct mutex lock; /* protect non-concurrent retimer & switch */
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enum typec_orientation orientation;
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unsigned long mode;
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unsigned int svid;
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};
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static void nb7vpq904m_set_channel(struct nb7vpq904m *nb7, unsigned int channel, bool dp)
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{
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u8 eq, out_comp, flat_gain, loss_match;
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if (dp) {
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eq = NB7_IS_CHAN_AD(channel) ? 0x6 : 0x4;
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out_comp = 0x3;
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flat_gain = NB7_IS_CHAN_AD(channel) ? 0x2 : 0x1;
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loss_match = 0x3;
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} else {
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eq = 0x4;
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out_comp = 0x3;
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flat_gain = NB7_IS_CHAN_AD(channel) ? 0x3 : 0x1;
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loss_match = NB7_IS_CHAN_AD(channel) ? 0x1 : 0x3;
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}
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regmap_update_bits(nb7->regmap, EQ_SETTING_REG(channel),
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EQ_SETTING_MASK, FIELD_PREP(EQ_SETTING_MASK, eq));
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regmap_update_bits(nb7->regmap, OUTPUT_COMPRESSION_AND_POL_REG(channel),
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OUTPUT_COMPRESSION_MASK, FIELD_PREP(OUTPUT_COMPRESSION_MASK, out_comp));
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regmap_update_bits(nb7->regmap, FLAT_GAIN_REG(channel),
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FLAT_GAIN_MASK, FIELD_PREP(FLAT_GAIN_MASK, flat_gain));
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regmap_update_bits(nb7->regmap, LOSS_MATCH_REG(channel),
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LOSS_MATCH_MASK, FIELD_PREP(LOSS_MATCH_MASK, loss_match));
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}
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static int nb7vpq904m_set(struct nb7vpq904m *nb7)
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{
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bool reverse = (nb7->orientation == TYPEC_ORIENTATION_REVERSE);
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switch (nb7->mode) {
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case TYPEC_STATE_SAFE:
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regmap_write(nb7->regmap, GEN_DEV_SET_REG,
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GEN_DEV_SET_CHIP_EN |
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GEN_DEV_SET_CHNA_EN |
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GEN_DEV_SET_CHNB_EN |
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GEN_DEV_SET_CHNC_EN |
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GEN_DEV_SET_CHND_EN |
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FIELD_PREP(GEN_DEV_SET_OP_MODE_MASK,
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GEN_DEV_SET_OP_MODE_USB));
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nb7vpq904m_set_channel(nb7, NB7_CHNA, false);
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nb7vpq904m_set_channel(nb7, NB7_CHNB, false);
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nb7vpq904m_set_channel(nb7, NB7_CHNC, false);
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nb7vpq904m_set_channel(nb7, NB7_CHND, false);
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regmap_write(nb7->regmap, AUX_CC_REG, 0x2);
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return 0;
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case TYPEC_STATE_USB:
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/*
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* Normal Orientation (CC1)
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* A -> USB RX
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* B -> USB TX
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* C -> X
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* D -> X
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* Flipped Orientation (CC2)
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* A -> X
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* B -> X
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* C -> USB TX
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* D -> USB RX
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*
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* Reversed if data lanes are swapped
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*/
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if (reverse ^ nb7->swap_data_lanes) {
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regmap_write(nb7->regmap, GEN_DEV_SET_REG,
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GEN_DEV_SET_CHIP_EN |
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GEN_DEV_SET_CHNA_EN |
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GEN_DEV_SET_CHNB_EN |
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FIELD_PREP(GEN_DEV_SET_OP_MODE_MASK,
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GEN_DEV_SET_OP_MODE_USB));
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nb7vpq904m_set_channel(nb7, NB7_CHNA, false);
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nb7vpq904m_set_channel(nb7, NB7_CHNB, false);
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} else {
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regmap_write(nb7->regmap, GEN_DEV_SET_REG,
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GEN_DEV_SET_CHIP_EN |
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GEN_DEV_SET_CHNC_EN |
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GEN_DEV_SET_CHND_EN |
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FIELD_PREP(GEN_DEV_SET_OP_MODE_MASK,
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GEN_DEV_SET_OP_MODE_USB));
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nb7vpq904m_set_channel(nb7, NB7_CHNC, false);
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nb7vpq904m_set_channel(nb7, NB7_CHND, false);
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}
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regmap_write(nb7->regmap, AUX_CC_REG, 0x2);
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return 0;
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default:
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if (nb7->svid != USB_TYPEC_DP_SID)
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return -EINVAL;
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break;
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}
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/* DP Altmode Setup */
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regmap_write(nb7->regmap, AUX_CC_REG, reverse ? 0x1 : 0x0);
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switch (nb7->mode) {
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case TYPEC_DP_STATE_C:
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case TYPEC_DP_STATE_E:
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/*
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* Normal Orientation (CC1)
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* A -> DP3
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* B -> DP2
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* C -> DP1
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* D -> DP0
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* Flipped Orientation (CC2)
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* A -> DP0
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* B -> DP1
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* C -> DP2
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* D -> DP3
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*/
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regmap_write(nb7->regmap, GEN_DEV_SET_REG,
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GEN_DEV_SET_CHIP_EN |
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GEN_DEV_SET_CHNA_EN |
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GEN_DEV_SET_CHNB_EN |
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GEN_DEV_SET_CHNC_EN |
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GEN_DEV_SET_CHND_EN |
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FIELD_PREP(GEN_DEV_SET_OP_MODE_MASK,
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GEN_DEV_SET_OP_MODE_DP_4LANE));
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nb7vpq904m_set_channel(nb7, NB7_CHNA, true);
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nb7vpq904m_set_channel(nb7, NB7_CHNB, true);
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nb7vpq904m_set_channel(nb7, NB7_CHNC, true);
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nb7vpq904m_set_channel(nb7, NB7_CHND, true);
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break;
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case TYPEC_DP_STATE_D:
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case TYPEC_DP_STATE_F:
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regmap_write(nb7->regmap, GEN_DEV_SET_REG,
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GEN_DEV_SET_CHIP_EN |
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GEN_DEV_SET_CHNA_EN |
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GEN_DEV_SET_CHNB_EN |
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GEN_DEV_SET_CHNC_EN |
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GEN_DEV_SET_CHND_EN |
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FIELD_PREP(GEN_DEV_SET_OP_MODE_MASK,
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reverse ^ nb7->swap_data_lanes ?
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GEN_DEV_SET_OP_MODE_DP_CC2
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: GEN_DEV_SET_OP_MODE_DP_CC1));
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/*
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* Normal Orientation (CC1)
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* A -> USB RX
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* B -> USB TX
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* C -> DP1
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* D -> DP0
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* Flipped Orientation (CC2)
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* A -> DP0
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* B -> DP1
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* C -> USB TX
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* D -> USB RX
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*
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* Reversed if data lanes are swapped
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*/
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if (nb7->swap_data_lanes) {
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nb7vpq904m_set_channel(nb7, NB7_CHNA, !reverse);
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nb7vpq904m_set_channel(nb7, NB7_CHNB, !reverse);
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nb7vpq904m_set_channel(nb7, NB7_CHNC, reverse);
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nb7vpq904m_set_channel(nb7, NB7_CHND, reverse);
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} else {
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nb7vpq904m_set_channel(nb7, NB7_CHNA, reverse);
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nb7vpq904m_set_channel(nb7, NB7_CHNB, reverse);
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nb7vpq904m_set_channel(nb7, NB7_CHNC, !reverse);
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nb7vpq904m_set_channel(nb7, NB7_CHND, !reverse);
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}
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int nb7vpq904m_sw_set(struct typec_switch_dev *sw, enum typec_orientation orientation)
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{
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struct nb7vpq904m *nb7 = typec_switch_get_drvdata(sw);
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int ret;
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ret = typec_switch_set(nb7->typec_switch, orientation);
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if (ret)
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return ret;
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mutex_lock(&nb7->lock);
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if (nb7->orientation != orientation) {
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nb7->orientation = orientation;
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ret = nb7vpq904m_set(nb7);
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}
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mutex_unlock(&nb7->lock);
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return ret;
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}
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static int nb7vpq904m_retimer_set(struct typec_retimer *retimer, struct typec_retimer_state *state)
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{
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struct nb7vpq904m *nb7 = typec_retimer_get_drvdata(retimer);
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int ret = 0;
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mutex_lock(&nb7->lock);
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if (nb7->mode != state->mode) {
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nb7->mode = state->mode;
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if (state->alt)
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nb7->svid = state->alt->svid;
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else
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nb7->svid = 0; // No SVID
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ret = nb7vpq904m_set(nb7);
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}
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mutex_unlock(&nb7->lock);
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return ret;
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}
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#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_DRM_PANEL_BRIDGE)
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static int nb7vpq904m_bridge_attach(struct drm_bridge *bridge,
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enum drm_bridge_attach_flags flags)
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{
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struct nb7vpq904m *nb7 = container_of(bridge, struct nb7vpq904m, bridge);
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struct drm_bridge *next_bridge;
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if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
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return -EINVAL;
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next_bridge = devm_drm_of_get_bridge(&nb7->client->dev, nb7->client->dev.of_node, 0, 0);
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if (IS_ERR(next_bridge)) {
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dev_err(&nb7->client->dev, "failed to acquire drm_bridge: %pe\n", next_bridge);
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return PTR_ERR(next_bridge);
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}
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return drm_bridge_attach(bridge->encoder, next_bridge, bridge,
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DRM_BRIDGE_ATTACH_NO_CONNECTOR);
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}
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static const struct drm_bridge_funcs nb7vpq904m_bridge_funcs = {
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.attach = nb7vpq904m_bridge_attach,
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};
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static int nb7vpq904m_register_bridge(struct nb7vpq904m *nb7)
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{
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nb7->bridge.funcs = &nb7vpq904m_bridge_funcs;
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nb7->bridge.of_node = nb7->client->dev.of_node;
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return devm_drm_bridge_add(&nb7->client->dev, &nb7->bridge);
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}
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#else
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static int nb7vpq904m_register_bridge(struct nb7vpq904m *nb7)
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{
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return 0;
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}
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#endif
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static const struct regmap_config nb7_regmap = {
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.max_register = 0x1f,
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.reg_bits = 8,
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.val_bits = 8,
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};
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enum {
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NORMAL_LANE_MAPPING,
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INVERT_LANE_MAPPING,
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};
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#define DATA_LANES_COUNT 4
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static const int supported_data_lane_mapping[][DATA_LANES_COUNT] = {
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[NORMAL_LANE_MAPPING] = { 0, 1, 2, 3 },
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[INVERT_LANE_MAPPING] = { 3, 2, 1, 0 },
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};
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static int nb7vpq904m_parse_data_lanes_mapping(struct nb7vpq904m *nb7)
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{
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struct device_node *ep;
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u32 data_lanes[4];
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int ret, i, j;
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ep = of_graph_get_endpoint_by_regs(nb7->client->dev.of_node, 1, 0);
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if (ep) {
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ret = of_property_count_u32_elems(ep, "data-lanes");
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if (ret == -EINVAL)
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/* Property isn't here, consider default mapping */
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goto out_done;
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if (ret < 0)
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goto out_error;
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if (ret != DATA_LANES_COUNT) {
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dev_err(&nb7->client->dev, "expected 4 data lanes\n");
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ret = -EINVAL;
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goto out_error;
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}
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ret = of_property_read_u32_array(ep, "data-lanes", data_lanes, DATA_LANES_COUNT);
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if (ret)
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goto out_error;
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for (i = 0; i < ARRAY_SIZE(supported_data_lane_mapping); i++) {
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for (j = 0; j < DATA_LANES_COUNT; j++) {
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if (data_lanes[j] != supported_data_lane_mapping[i][j])
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break;
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}
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if (j == DATA_LANES_COUNT)
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break;
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}
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switch (i) {
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case NORMAL_LANE_MAPPING:
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break;
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case INVERT_LANE_MAPPING:
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nb7->swap_data_lanes = true;
|
||||
dev_info(&nb7->client->dev, "using inverted data lanes mapping\n");
|
||||
break;
|
||||
default:
|
||||
dev_err(&nb7->client->dev, "invalid data lanes mapping\n");
|
||||
ret = -EINVAL;
|
||||
goto out_error;
|
||||
}
|
||||
}
|
||||
|
||||
out_done:
|
||||
ret = 0;
|
||||
|
||||
out_error:
|
||||
of_node_put(ep);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int nb7vpq904m_probe(struct i2c_client *client)
|
||||
{
|
||||
struct device *dev = &client->dev;
|
||||
struct typec_switch_desc sw_desc = { };
|
||||
struct typec_retimer_desc retimer_desc = { };
|
||||
struct nb7vpq904m *nb7;
|
||||
int ret;
|
||||
|
||||
nb7 = devm_kzalloc(dev, sizeof(*nb7), GFP_KERNEL);
|
||||
if (!nb7)
|
||||
return -ENOMEM;
|
||||
|
||||
nb7->client = client;
|
||||
|
||||
nb7->regmap = devm_regmap_init_i2c(client, &nb7_regmap);
|
||||
if (IS_ERR(nb7->regmap)) {
|
||||
dev_err(&client->dev, "Failed to allocate register map\n");
|
||||
return PTR_ERR(nb7->regmap);
|
||||
}
|
||||
|
||||
nb7->mode = TYPEC_STATE_SAFE;
|
||||
nb7->orientation = TYPEC_ORIENTATION_NONE;
|
||||
|
||||
mutex_init(&nb7->lock);
|
||||
|
||||
nb7->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
|
||||
if (IS_ERR(nb7->enable_gpio))
|
||||
return dev_err_probe(dev, PTR_ERR(nb7->enable_gpio),
|
||||
"unable to acquire enable gpio\n");
|
||||
|
||||
nb7->vcc_supply = devm_regulator_get_optional(dev, "vcc");
|
||||
if (IS_ERR(nb7->vcc_supply))
|
||||
return PTR_ERR(nb7->vcc_supply);
|
||||
|
||||
nb7->typec_switch = fwnode_typec_switch_get(dev->fwnode);
|
||||
if (IS_ERR(nb7->typec_switch))
|
||||
return dev_err_probe(dev, PTR_ERR(nb7->typec_switch),
|
||||
"failed to acquire orientation-switch\n");
|
||||
|
||||
ret = nb7vpq904m_parse_data_lanes_mapping(nb7);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = regulator_enable(nb7->vcc_supply);
|
||||
if (ret)
|
||||
dev_warn(dev, "Failed to enable vcc: %d\n", ret);
|
||||
|
||||
gpiod_set_value(nb7->enable_gpio, 1);
|
||||
|
||||
ret = nb7vpq904m_register_bridge(nb7);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
sw_desc.drvdata = nb7;
|
||||
sw_desc.fwnode = dev->fwnode;
|
||||
sw_desc.set = nb7vpq904m_sw_set;
|
||||
|
||||
nb7->sw = typec_switch_register(dev, &sw_desc);
|
||||
if (IS_ERR(nb7->sw))
|
||||
return dev_err_probe(dev, PTR_ERR(nb7->sw),
|
||||
"Error registering typec switch\n");
|
||||
|
||||
retimer_desc.drvdata = nb7;
|
||||
retimer_desc.fwnode = dev->fwnode;
|
||||
retimer_desc.set = nb7vpq904m_retimer_set;
|
||||
|
||||
nb7->retimer = typec_retimer_register(dev, &retimer_desc);
|
||||
if (IS_ERR(nb7->retimer)) {
|
||||
typec_switch_unregister(nb7->sw);
|
||||
return dev_err_probe(dev, PTR_ERR(nb7->retimer),
|
||||
"Error registering typec retimer\n");
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void nb7vpq904m_remove(struct i2c_client *client)
|
||||
{
|
||||
struct nb7vpq904m *nb7 = i2c_get_clientdata(client);
|
||||
|
||||
typec_retimer_unregister(nb7->retimer);
|
||||
typec_switch_unregister(nb7->sw);
|
||||
|
||||
gpiod_set_value(nb7->enable_gpio, 0);
|
||||
|
||||
regulator_disable(nb7->vcc_supply);
|
||||
}
|
||||
|
||||
static const struct i2c_device_id nb7vpq904m_table[] = {
|
||||
{ "nb7vpq904m" },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, nb7vpq904m_table);
|
||||
|
||||
static const struct of_device_id nb7vpq904m_of_table[] = {
|
||||
{ .compatible = "onnn,nb7vpq904m" },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, nb7vpq904m_of_table);
|
||||
|
||||
static struct i2c_driver nb7vpq904m_driver = {
|
||||
.driver = {
|
||||
.name = "nb7vpq904m",
|
||||
.of_match_table = nb7vpq904m_of_table,
|
||||
},
|
||||
.probe_new = nb7vpq904m_probe,
|
||||
.remove = nb7vpq904m_remove,
|
||||
.id_table = nb7vpq904m_table,
|
||||
};
|
||||
|
||||
module_i2c_driver(nb7vpq904m_driver);
|
||||
|
||||
MODULE_AUTHOR("Dmitry Baryshkov <dmitry.baryshkov@linaro.org>");
|
||||
MODULE_DESCRIPTION("OnSemi NB7VPQ904M Type-C driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user