Re: [PATCH v2 1/2] usb typec: mt6360: Add support for mt6360 Type-C driver

From: 啟原黃
Date: Thu Aug 27 2020 - 11:21:05 EST

Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx> 於 2020年8月27日 週四 下午4:05寫道：
>
> On Thu, 2020-08-27 at 12:50 +0800, cy_huang wrote:
> > From: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
> >
> > Mediatek MT6360 is a multi-functional IC that includes USB Type-C.
> > It works with Type-C Port Controller Manager to provide USB PD
> > and USB Type-C functionalities.
> >
> > Add fix to Prevent the race condition from interrupt and tcpci port unregister
> > during module remove.
> >
> > Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
> > ---
> > drivers/usb/typec/tcpm/Kconfig | 8 ++
> > drivers/usb/typec/tcpm/Makefile | 1 +
> > drivers/usb/typec/tcpm/tcpci_mt6360.c | 213 ++++++++++++++++++++++++++++++++++
> Can you avoid using special SoC name in file name?
> It's not clear if you later support new SoC in the driver, e.g. mt63xx?
Okay, I will rename it to mt636x. From our SubPMIC generation,
currently, naming will be 6360/62/67, etc..
>From our SOC roadmap, one generation can be used for one to two more years.
I think the name MT636x is enough.
For the next one, I can submit the patch to make it compatible with this driver.
Thanks for you comment.
>
> > 3 files changed, 222 insertions(+)
> > create mode 100644 drivers/usb/typec/tcpm/tcpci_mt6360.c
> >
> > diff --git a/drivers/usb/typec/tcpm/Kconfig b/drivers/usb/typec/tcpm/Kconfig
> > index fa3f393..58a64e1 100644
> > --- a/drivers/usb/typec/tcpm/Kconfig
> > +++ b/drivers/usb/typec/tcpm/Kconfig
> > @@ -27,6 +27,14 @@ config TYPEC_RT1711H
> > Type-C Port Controller Manager to provide USB PD and USB
> > Type-C functionalities.
> >
> > +config TYPEC_MT6360
> > + tristate "Mediatek MT6360 Type-C driver"
> > + depends on MFD_MT6360
> > + help
> > + Mediatek MT6360 is a multi-functional IC that includes
> > + USB Type-C. It works with Type-C Port Controller Manager
> > + to provide USB PD and USB Type-C functionalities.
> > +
> > endif # TYPEC_TCPCI
> >
> > config TYPEC_FUSB302
> > diff --git a/drivers/usb/typec/tcpm/Makefile b/drivers/usb/typec/tcpm/Makefile
> > index a5ff6c8..7592ccb 100644
> > --- a/drivers/usb/typec/tcpm/Makefile
> > +++ b/drivers/usb/typec/tcpm/Makefile
> > @@ -5,3 +5,4 @@ obj-$(CONFIG_TYPEC_WCOVE) += typec_wcove.o
> > typec_wcove-y := wcove.o
> > obj-$(CONFIG_TYPEC_TCPCI) += tcpci.o
> > obj-$(CONFIG_TYPEC_RT1711H) += tcpci_rt1711h.o
> > +obj-$(CONFIG_TYPEC_MT6360) += tcpci_mt6360.o
> > diff --git a/drivers/usb/typec/tcpm/tcpci_mt6360.c b/drivers/usb/typec/tcpm/tcpci_mt6360.c
> > new file mode 100644
> > index 00000000..a381b5d
> > --- /dev/null
> > +++ b/drivers/usb/typec/tcpm/tcpci_mt6360.c
> > @@ -0,0 +1,213 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +//
> > +// Copyright (C) 2020 MediaTek Inc.
> > +//
> > +// Author: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
> Use /* */ except SPDX?
Yes, sure.
>
> > +
> > +#include <linux/interrupt.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +#include <linux/usb/tcpm.h>
> > +
> > +#include "tcpci.h"
> > +
> > +#define MT6360_REG_VCONNCTRL1 0x8C
> > +#define MT6360_REG_MODECTRL2 0x8F
> > +#define MT6360_REG_SWRESET 0xA0
> > +#define MT6360_REG_DEBCTRL1 0xA1
> > +#define MT6360_REG_DRPCTRL1 0xA2
> > +#define MT6360_REG_DRPCTRL2 0xA3
> > +#define MT6360_REG_I2CTORST 0xBF
> > +#define MT6360_REG_RXCTRL2 0xCF
> > +#define MT6360_REG_CTDCTRL2 0xEC
> > +
> > +/* MT6360_REG_VCONNCTRL1 */
> > +#define MT6360_VCONNCL_ENABLE BIT(0)
> > +/* MT6360_REG_RXCTRL2 */
> > +#define MT6360_OPEN40M_ENABLE BIT(7)
> > +/* MT6360_REG_CTDCTRL2 */
> > +#define MT6360_RPONESHOT_ENABLE BIT(6)
> > +
> > +struct mt6360_tcpc_info {
> > + struct tcpci_data tdata;
> > + struct tcpci *tcpci;
> > + struct device *dev;
> > + int irq;
> > +};
> > +
> > +static inline int mt6360_tcpc_read16(struct regmap *regmap,
> > + unsigned int reg, u16 *val)
> > +{
> > + return regmap_raw_read(regmap, reg, val, sizeof(u16));
> > +}
> > +
> > +static inline int mt6360_tcpc_write16(struct regmap *regmap,
> > + unsigned int reg, u16 val)
> > +{
> > + return regmap_raw_write(regmap, reg, &val, sizeof(u16));
> > +}
> > +
> > +static int mt6360_tcpc_init(struct tcpci *tcpci, struct tcpci_data *tdata)
> > +{
> > + struct regmap *regmap = tdata->regmap;
> > + int ret;
> > +
> > + ret = regmap_write(regmap, MT6360_REG_SWRESET, 0x01);
> > + if (ret)
> > + return ret;
> > +
> > + /* after reset command, wait 1~2ms to wait IC action */
> > + usleep_range(1000, 2000);
> > +
> > + /* write all alert to masked */
> > + ret = mt6360_tcpc_write16(regmap, TCPC_ALERT_MASK, 0);
> > + if (ret)
> > + return ret;
> > +
> > + /* config I2C timeout reset enable , and timeout to 200ms */
> > + ret = regmap_write(regmap, MT6360_REG_I2CTORST, 0x8F);
> > + if (ret)
> > + return ret;
> > +
> > + /* config CC Detect Debounce : 26.7*val us */
> > + ret = regmap_write(regmap, MT6360_REG_DEBCTRL1, 0x10);
> > + if (ret)
> > + return ret;
> > +
> > + /* DRP Toggle Cycle : 51.2 + 6.4*val ms */
> > + ret = regmap_write(regmap, MT6360_REG_DRPCTRL1, 4);
> > + if (ret)
> > + return ret;
> > +
> > + /* DRP Duyt Ctrl : dcSRC: /1024 */
> > + ret = mt6360_tcpc_write16(regmap, MT6360_REG_DRPCTRL2, 330);
> > + if (ret)
> > + return ret;
> > +
> > + /* Enable VCONN Current Limit function */
> > + ret = regmap_update_bits(regmap, MT6360_REG_VCONNCTRL1, MT6360_VCONNCL_ENABLE,
> > + MT6360_VCONNCL_ENABLE);
> > + if (ret)
> > + return ret;
> > +
> > + /* Enable cc open 40ms when pmic send vsysuv signal */
> > + ret = regmap_update_bits(regmap, MT6360_REG_RXCTRL2, MT6360_OPEN40M_ENABLE,
> > + MT6360_OPEN40M_ENABLE);
> > + if (ret)
> > + return ret;
> > +
> > + /* Enable Rpdet oneshot detection */
> > + ret = regmap_update_bits(regmap, MT6360_REG_CTDCTRL2, MT6360_RPONESHOT_ENABLE,
> > + MT6360_RPONESHOT_ENABLE);
> > + if (ret)
> > + return ret;
> > +
> > + /* Set shipping mode off, AUTOIDLE on */
> > + return regmap_write(regmap, MT6360_REG_MODECTRL2, 0x7A);
> > +}
> > +
> > +static irqreturn_t mt6360_irq(int irq, void *dev_id)
> > +{
> > + struct mt6360_tcpc_info *mti = dev_id;
> > +
> > + return tcpci_irq(mti->tcpci);
> > +}
> > +
> > +static int mt6360_tcpc_probe(struct platform_device *pdev)
> > +{
> > + struct mt6360_tcpc_info *mti;
> > + int ret;
> > +
> > + mti = devm_kzalloc(&pdev->dev, sizeof(*mti), GFP_KERNEL);
> > + if (!mti)
> > + return -ENOMEM;
> > +
> > + mti->dev = &pdev->dev;
> > +
> > + mti->tdata.regmap = dev_get_regmap(pdev->dev.parent, NULL);
> > + if (!mti->tdata.regmap) {
> > + dev_err(&pdev->dev, "Failed to get parent regmap\n");
> > + return -ENODEV;
> > + }
> > +
> > + mti->irq = platform_get_irq_byname(pdev, "PD_IRQB");
> > + if (mti->irq < 0) {
> > + dev_err(&pdev->dev, "Failed to get PD_IRQB irq\n");
> No need add error log, platform_get_irq_byname will print it
I'll remove it in the next revision. Thanks
>
> > + return mti->irq;
> > + }
> > +
> > + mti->tdata.init = mt6360_tcpc_init;
> > + mti->tcpci = tcpci_register_port(&pdev->dev, &mti->tdata);
> > + if (IS_ERR_OR_NULL(mti->tcpci)) {
> Use IS_ERR()? it seems not return NULL
> > + dev_err(&pdev->dev, "Failed to register tcpci port\n");
> > + return PTR_ERR(mti->tcpci);
> If return NULL, this may return 0?
Remove it later. you're right.
>
> > + }
> > +
> > + ret = devm_request_threaded_irq(mti->dev, mti->irq, NULL, mt6360_irq, IRQF_ONESHOT,
> > + dev_name(&pdev->dev), mti);
> > + if (ret) {
> > + dev_err(mti->dev, "Failed to register irq\n");
> > + tcpci_unregister_port(mti->tcpci);
> > + return ret;
> > + }
> > +
> > + device_init_wakeup(&pdev->dev, true);
> > + platform_set_drvdata(pdev, mti);
> > +
> > + return 0;
> > +}
> > +
> > +static int mt6360_tcpc_remove(struct platform_device *pdev)
> > +{
> > + struct mt6360_tcpc_info *mti = platform_get_drvdata(pdev);
> > +
> > + disable_irq(mti->irq);
> need sync?
Yes, sync must be considered to wait interrupt is really finished.
And disable_irq already the sync version.
>
> > + tcpci_unregister_port(mti->tcpci);
> > + return 0;
> > +}
> > +
> > +static int __maybe_unused mt6360_tcpc_suspend(struct device *dev)
> > +{
> > + struct mt6360_tcpc_info *mti = dev_get_drvdata(dev);
> > +
> > + if (device_may_wakeup(dev))
> > + enable_irq_wake(mti->irq);
> > +
> > + return 0;
> > +}
> > +
> > +static int __maybe_unused mt6360_tcpc_resume(struct device *dev)
> > +{
> > + struct mt6360_tcpc_info *mti = dev_get_drvdata(dev);
> > +
> > + if (device_may_wakeup(dev))
> > + disable_irq_wake(mti->irq);
> > +
> > + return 0;
> > +}
> > +
> > +static SIMPLE_DEV_PM_OPS(mt6360_tcpc_pm_ops, mt6360_tcpc_suspend, mt6360_tcpc_resume);
> > +
> > +static const struct of_device_id __maybe_unused mt6360_tcpc_of_id[] = {
> > + { .compatible = "mediatek,mt6360-tcpc", },
> > + {},
> > +};
> > +MODULE_DEVICE_TABLE(of, mt6360_tcpc_of_id);
> > +
> > +static struct platform_driver mt6360_tcpc_driver = {
> > + .driver = {
> > + .name = "mt6360-tcpc",
> > + .pm = &mt6360_tcpc_pm_ops,
> > + .of_match_table = mt6360_tcpc_of_id,
> > + },
> > + .probe = mt6360_tcpc_probe,
> > + .remove = mt6360_tcpc_remove,
> > +};
> > +module_platform_driver(mt6360_tcpc_driver);
> > +
> > +MODULE_AUTHOR("ChiYuan Huang <cy_huang@xxxxxxxxxxx>");
> > +MODULE_DESCRIPTION("MT6360 USB Type-C Port Controller Interface Driver");
> > +MODULE_LICENSE("GPL v2");
>