Re: [RFC v4 2/5] usb: dwc3: core: Refactor PHY logic to support Multiport Controller

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Hi,

On Sun, Jan 15, 2023, Krishna Kurapati wrote:
> Currently the DWC3 driver supports only single port controller
> which requires at most one HS and one SS PHY.

Add note here that multi-port is for host mode for clarity.

> 
> But the DWC3 USB controller can be connected to multiple ports and
> each port can have their own PHYs. Each port of the multiport
> controller can either be HS+SS capable or HS only capable
> Proper quantification of them is required to modify GUSB2PHYCFG
> and GUSB3PIPECTL registers appropriately.
> 
> Add support for detecting, obtaining and configuring phy's supported
> by a multiport controller and limit the max number of ports
> supported to 4.
> 
> Signed-off-by: Harsh Agarwal <quic_harshq@xxxxxxxxxxx>
> Signed-off-by: Krishna Kurapati <quic_kriskura@xxxxxxxxxxx>
> ---
>  drivers/usb/dwc3/core.c | 304 +++++++++++++++++++++++++++++-----------
>  drivers/usb/dwc3/core.h |  15 +-
>  drivers/usb/dwc3/drd.c  |  14 +-
>  3 files changed, 244 insertions(+), 89 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 476b63618511..7e0a9a598dfd 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -120,7 +120,7 @@ static void __dwc3_set_mode(struct work_struct *work)
>  {
>  	struct dwc3 *dwc = work_to_dwc(work);
>  	unsigned long flags;
> -	int ret;
> +	int ret, i;

Can we declare variables in separate lines here and other places.

>  	u32 reg;
>  	u32 desired_dr_role;
>  
> @@ -200,8 +200,10 @@ static void __dwc3_set_mode(struct work_struct *work)
>  		} else {
>  			if (dwc->usb2_phy)
>  				otg_set_vbus(dwc->usb2_phy->otg, true);
> -			phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
> -			phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
> +			for (i = 0; i < dwc->num_ports; i++) {
> +				phy_set_mode(dwc->usb2_generic_phy[i], PHY_MODE_USB_HOST);
> +				phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST);
> +			}
>  			if (dwc->dis_split_quirk) {
>  				reg = dwc3_readl(dwc->regs, DWC3_GUCTL3);
>  				reg |= DWC3_GUCTL3_SPLITDISABLE;
> @@ -216,8 +218,8 @@ static void __dwc3_set_mode(struct work_struct *work)
>  
>  		if (dwc->usb2_phy)
>  			otg_set_vbus(dwc->usb2_phy->otg, false);
> -		phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
> -		phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
> +		phy_set_mode(dwc->usb2_generic_phy[0], PHY_MODE_USB_DEVICE);
> +		phy_set_mode(dwc->usb3_generic_phy[0], PHY_MODE_USB_DEVICE);
>  
>  		ret = dwc3_gadget_init(dwc);
>  		if (ret)
> @@ -659,22 +661,14 @@ static int dwc3_core_ulpi_init(struct dwc3 *dwc)
>  	return ret;
>  }
>  
> -/**
> - * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core
> - * @dwc: Pointer to our controller context structure
> - *
> - * Returns 0 on success. The USB PHY interfaces are configured but not
> - * initialized. The PHY interfaces and the PHYs get initialized together with
> - * the core in dwc3_core_init.
> - */
> -static int dwc3_phy_setup(struct dwc3 *dwc)
> +static int dwc3_ss_phy_setup(struct dwc3 *dwc, int index)
>  {
>  	unsigned int hw_mode;
>  	u32 reg;
>  
>  	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
>  
> -	reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
> +	reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(index));
>  
>  	/*
>  	 * Make sure UX_EXIT_PX is cleared as that causes issues with some
> @@ -729,9 +723,19 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
>  	if (dwc->dis_del_phy_power_chg_quirk)
>  		reg &= ~DWC3_GUSB3PIPECTL_DEPOCHANGE;
>  
> -	dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
> +	dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(index), reg);
>  
> -	reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
> +	return 0;
> +}
> +
> +static int dwc3_hs_phy_setup(struct dwc3 *dwc, int index)
> +{
> +	unsigned int hw_mode;
> +	u32 reg;
> +
> +	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
> +
> +	reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(index));
>  
>  	/* Select the HS PHY interface */
>  	switch (DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3)) {
> @@ -743,7 +747,7 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
>  		} else if (dwc->hsphy_interface &&
>  				!strncmp(dwc->hsphy_interface, "ulpi", 4)) {
>  			reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI;
> -			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
> +			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(index), reg);
>  		} else {
>  			/* Relying on default value. */
>  			if (!(reg & DWC3_GUSB2PHYCFG_ULPI_UTMI))
> @@ -800,7 +804,35 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
>  	if (dwc->dis_u2_freeclk_exists_quirk || dwc->gfladj_refclk_lpm_sel)
>  		reg &= ~DWC3_GUSB2PHYCFG_U2_FREECLK_EXISTS;
>  
> -	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
> +	dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(index), reg);
> +
> +	return 0;
> +}
> +
> +/**
> + * dwc3_phy_setup - Configure USB PHY Interface of DWC3 Core
> + * @dwc: Pointer to our controller context structure
> + *
> + * Returns 0 on success. The USB PHY interfaces are configured but not
> + * initialized. The PHY interfaces and the PHYs get initialized together with
> + * the core in dwc3_core_init.
> + */
> +static int dwc3_phy_setup(struct dwc3 *dwc)
> +{
> +	int i;
> +	int ret;
> +
> +	for (i = 0; i < dwc->num_ss_ports; i++) {
> +		ret = dwc3_ss_phy_setup(dwc, i);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	for (i = 0; i < dwc->num_ports; i++) {
> +		ret = dwc3_hs_phy_setup(dwc, i);
> +		if (ret)
> +			return ret;
> +	}
>  
>  	return 0;
>  }
> @@ -839,17 +871,25 @@ static void dwc3_clk_disable(struct dwc3 *dwc)
>  
>  static void dwc3_core_exit(struct dwc3 *dwc)
>  {
> +	int i;
> +
>  	dwc3_event_buffers_cleanup(dwc);
>  
>  	usb_phy_set_suspend(dwc->usb2_phy, 1);
>  	usb_phy_set_suspend(dwc->usb3_phy, 1);
> -	phy_power_off(dwc->usb2_generic_phy);
> -	phy_power_off(dwc->usb3_generic_phy);
> +
> +	for (i = 0; i < dwc->num_ports; i++) {
> +		phy_power_off(dwc->usb2_generic_phy[i]);
> +		phy_power_off(dwc->usb3_generic_phy[i]);
> +	}
>  
>  	usb_phy_shutdown(dwc->usb2_phy);
>  	usb_phy_shutdown(dwc->usb3_phy);
> -	phy_exit(dwc->usb2_generic_phy);
> -	phy_exit(dwc->usb3_generic_phy);
> +
> +	for (i = 0; i < dwc->num_ports; i++) {
> +		phy_exit(dwc->usb2_generic_phy[i]);
> +		phy_exit(dwc->usb3_generic_phy[i]);
> +	}
>  
>  	dwc3_clk_disable(dwc);
>  	reset_control_assert(dwc->reset);
> @@ -1085,6 +1125,7 @@ static int dwc3_core_init(struct dwc3 *dwc)
>  	unsigned int		hw_mode;
>  	u32			reg;
>  	int			ret;
> +	int			i, j;
>  
>  	hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
>  
> @@ -1119,14 +1160,27 @@ static int dwc3_core_init(struct dwc3 *dwc)
>  
>  	usb_phy_init(dwc->usb2_phy);
>  	usb_phy_init(dwc->usb3_phy);
> -	ret = phy_init(dwc->usb2_generic_phy);
> -	if (ret < 0)
> -		goto err0a;
>  
> -	ret = phy_init(dwc->usb3_generic_phy);
> -	if (ret < 0) {
> -		phy_exit(dwc->usb2_generic_phy);
> -		goto err0a;
> +	for (i = 0; i < dwc->num_ports; i++) {
> +		ret = phy_init(dwc->usb2_generic_phy[i]);
> +		if (ret < 0) {
> +			/* clean up prior initialized HS PHYs */
> +			for (j = 0; j < i; j++)
> +				phy_exit(dwc->usb2_generic_phy[j]);
> +			goto err0a;
> +		}
> +	}
> +
> +	for (i = 0; i < dwc->num_ports; i++) {
> +		ret = phy_init(dwc->usb3_generic_phy[i]);
> +		if (ret < 0) {
> +			/* clean up prior initialized SS PHYs */
> +			for (j = 0; j < i; j++)
> +				phy_exit(dwc->usb3_generic_phy[j]);
> +			for (j = 0; j < dwc->num_ports; j++)
> +				phy_exit(dwc->usb2_generic_phy[j]);
> +			goto err0a;
> +		}
>  	}
>  
>  	ret = dwc3_core_soft_reset(dwc);
> @@ -1136,15 +1190,19 @@ static int dwc3_core_init(struct dwc3 *dwc)
>  	if (hw_mode == DWC3_GHWPARAMS0_MODE_DRD &&
>  	    !DWC3_VER_IS_WITHIN(DWC3, ANY, 194A)) {
>  		if (!dwc->dis_u3_susphy_quirk) {
> -			reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
> -			reg |= DWC3_GUSB3PIPECTL_SUSPHY;
> -			dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(0), reg);
> +			for (i = 0; i < dwc->num_ss_ports; i++) {
> +				reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(i));
> +				reg |= DWC3_GUSB3PIPECTL_SUSPHY;
> +				dwc3_writel(dwc->regs, DWC3_GUSB3PIPECTL(i), reg);
> +			}
>  		}
>  
>  		if (!dwc->dis_u2_susphy_quirk) {
> -			reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
> -			reg |= DWC3_GUSB2PHYCFG_SUSPHY;
> -			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
> +			for (i = 0; i < dwc->num_ports; i++) {
> +				reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(i));
> +				reg |= DWC3_GUSB2PHYCFG_SUSPHY;
> +				dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(i), reg);
> +			}
>  		}
>  	}
>  
> @@ -1168,13 +1226,25 @@ static int dwc3_core_init(struct dwc3 *dwc)
>  
>  	usb_phy_set_suspend(dwc->usb2_phy, 0);
>  	usb_phy_set_suspend(dwc->usb3_phy, 0);
> -	ret = phy_power_on(dwc->usb2_generic_phy);
> -	if (ret < 0)
> -		goto err2;
>  
> -	ret = phy_power_on(dwc->usb3_generic_phy);
> -	if (ret < 0)
> -		goto err3;
> +
> +	for (i = 0; i < dwc->num_ports; i++) {
> +		ret = phy_power_on(dwc->usb2_generic_phy[i]);
> +		if (ret < 0) {
> +			for (j = 0; j < i; j++)
> +				phy_power_off(dwc->usb2_generic_phy[j]);
> +			goto err2;
> +		}
> +	}
> +
> +	for (i = 0; i < dwc->num_ports; i++) {
> +		ret = phy_power_on(dwc->usb3_generic_phy[i]);
> +		if (ret < 0) {
> +			for (j = 0; j < i; j++)
> +				phy_power_off(dwc->usb3_generic_phy[j]);
> +			goto err3;
> +		}
> +	}
>  
>  	ret = dwc3_event_buffers_setup(dwc);
>  	if (ret) {
> @@ -1297,10 +1367,12 @@ static int dwc3_core_init(struct dwc3 *dwc)
>  	return 0;
>  
>  err4:
> -	phy_power_off(dwc->usb3_generic_phy);
> +	for (i = 0; i < dwc->num_ports; i++)
> +		phy_power_off(dwc->usb3_generic_phy[i]);
>  
>  err3:
> -	phy_power_off(dwc->usb2_generic_phy);
> +	for (i = 0; i < dwc->num_ports; i++)
> +		phy_power_off(dwc->usb2_generic_phy[i]);
>  
>  err2:
>  	usb_phy_set_suspend(dwc->usb2_phy, 1);
> @@ -1309,8 +1381,11 @@ static int dwc3_core_init(struct dwc3 *dwc)
>  err1:
>  	usb_phy_shutdown(dwc->usb2_phy);
>  	usb_phy_shutdown(dwc->usb3_phy);
> -	phy_exit(dwc->usb2_generic_phy);
> -	phy_exit(dwc->usb3_generic_phy);
> +
> +	for (i = 0; i < dwc->num_ports; i++) {
> +		phy_exit(dwc->usb2_generic_phy[i]);
> +		phy_exit(dwc->usb3_generic_phy[i]);
> +	}
>  
>  err0a:
>  	dwc3_ulpi_exit(dwc);
> @@ -1319,6 +1394,38 @@ static int dwc3_core_init(struct dwc3 *dwc)
>  	return ret;
>  }
>  
> +static int dwc3_get_multiport_phys(struct dwc3 *dwc)
> +{
> +	int ret;
> +	struct device *dev = dwc->dev;
> +	int i;
> +	char phy_name[15];
> +
> +	for (i = 0; i < dwc->num_ports; i++) {
> +		sprintf(phy_name, "usb2-phy_port%d", i);
> +		dwc->usb2_generic_phy[i] = devm_phy_get(dev, phy_name);
> +		if (IS_ERR(dwc->usb2_generic_phy[i])) {
> +			ret = PTR_ERR(dwc->usb2_generic_phy[i]);
> +			if (ret == -ENOSYS || ret == -ENODEV)
> +				dwc->usb2_generic_phy[i] = NULL;
> +			else
> +				return dev_err_probe(dev, ret, "usb2 phy: %s not configured\n", phy_name);
> +		}
> +
> +		sprintf(phy_name, "usb3-phy_port%d", i);
> +		dwc->usb3_generic_phy[i] = devm_phy_get(dev, phy_name);
> +		if (IS_ERR(dwc->usb3_generic_phy[i])) {
> +			ret = PTR_ERR(dwc->usb3_generic_phy[i]);
> +			if (ret == -ENOSYS || ret == -ENODEV)
> +				dwc->usb3_generic_phy[i] = NULL;
> +			else
> +				return dev_err_probe(dev, ret, "usb3 phy: %s not configured\n", phy_name);
> +		}
> +	}
> +
> +	return 0;
> +}
> +
>  static int dwc3_core_get_phy(struct dwc3 *dwc)
>  {
>  	struct device		*dev = dwc->dev;
> @@ -1349,31 +1456,37 @@ static int dwc3_core_get_phy(struct dwc3 *dwc)
>  			return dev_err_probe(dev, ret, "no usb3 phy configured\n");
>  	}
>  
> -	dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
> -	if (IS_ERR(dwc->usb2_generic_phy)) {
> -		ret = PTR_ERR(dwc->usb2_generic_phy);
> +	if (dwc->num_ports > 1)
> +		goto get_multiport_phys;

Can we avoid goto and just return dwc3_get_multiport_phys(dwc) here?
It's easier to read IMO.

> +
> +	dwc->usb2_generic_phy[0] = devm_phy_get(dev, "usb2-phy");
> +	if (IS_ERR(dwc->usb2_generic_phy[0])) {
> +		ret = PTR_ERR(dwc->usb2_generic_phy[0]);
>  		if (ret == -ENOSYS || ret == -ENODEV)
> -			dwc->usb2_generic_phy = NULL;
> +			dwc->usb2_generic_phy[0] = NULL;
>  		else
>  			return dev_err_probe(dev, ret, "no usb2 phy configured\n");
>  	}
>  
> -	dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy");
> -	if (IS_ERR(dwc->usb3_generic_phy)) {
> -		ret = PTR_ERR(dwc->usb3_generic_phy);
> +	dwc->usb3_generic_phy[0] = devm_phy_get(dev, "usb3-phy");
> +	if (IS_ERR(dwc->usb3_generic_phy[0])) {
> +		ret = PTR_ERR(dwc->usb3_generic_phy[0]);
>  		if (ret == -ENOSYS || ret == -ENODEV)
> -			dwc->usb3_generic_phy = NULL;
> +			dwc->usb3_generic_phy[0] = NULL;
>  		else
>  			return dev_err_probe(dev, ret, "no usb3 phy configured\n");
>  	}
>  
>  	return 0;
> +
> +get_multiport_phys:
> +	return dwc3_get_multiport_phys(dwc);
>  }
>  
>  static int dwc3_core_init_mode(struct dwc3 *dwc)
>  {
>  	struct device *dev = dwc->dev;
> -	int ret;
> +	int ret, i;
>  
>  	switch (dwc->dr_mode) {
>  	case USB_DR_MODE_PERIPHERAL:
> @@ -1381,8 +1494,8 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
>  
>  		if (dwc->usb2_phy)
>  			otg_set_vbus(dwc->usb2_phy->otg, false);
> -		phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_DEVICE);
> -		phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_DEVICE);
> +		phy_set_mode(dwc->usb2_generic_phy[0], PHY_MODE_USB_DEVICE);
> +		phy_set_mode(dwc->usb3_generic_phy[0], PHY_MODE_USB_DEVICE);
>  
>  		ret = dwc3_gadget_init(dwc);
>  		if (ret)
> @@ -1393,8 +1506,10 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
>  
>  		if (dwc->usb2_phy)
>  			otg_set_vbus(dwc->usb2_phy->otg, true);
> -		phy_set_mode(dwc->usb2_generic_phy, PHY_MODE_USB_HOST);
> -		phy_set_mode(dwc->usb3_generic_phy, PHY_MODE_USB_HOST);
> +		for (i = 0; i < dwc->num_ports; i++) {
> +			phy_set_mode(dwc->usb2_generic_phy[i], PHY_MODE_USB_HOST);
> +			phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST);
> +		}
>  
>  		ret = dwc3_host_init(dwc);
>  		if (ret)
> @@ -1575,6 +1690,21 @@ static void dwc3_get_properties(struct dwc3 *dwc)
>  	dwc->dis_split_quirk = device_property_read_bool(dev,
>  				"snps,dis-split-quirk");
>  
> +
> +	/*
> +	 * If no mulitport properties are defined, default

multi*

> +	 * the port count to '1'.
> +	 */

Can we initialize num_ports and num_ss_ports to 1 instead of setting it
on error (similar to how we handle other properties).

> +	ret = device_property_read_u32(dev, "num-ports",
> +				&dwc->num_ports);
> +	if (ret)
> +		dwc->num_ports = 1;
> +
> +	ret = device_property_read_u32(dev, "num-ss-ports",
> +				&dwc->num_ss_ports);
> +	if (ret)
> +		dwc->num_ss_ports = 1;
> +
>  	dwc->lpm_nyet_threshold = lpm_nyet_threshold;
>  	dwc->tx_de_emphasis = tx_de_emphasis;
>  
> @@ -1755,8 +1885,7 @@ static int dwc3_probe(struct platform_device *pdev)
>  	struct device		*dev = &pdev->dev;
>  	struct resource		*res, dwc_res;
>  	struct dwc3		*dwc;
> -
> -	int			ret;
> +	int			ret, i;
>  
>  	void __iomem		*regs;
>  
> @@ -1933,17 +2062,24 @@ static int dwc3_probe(struct platform_device *pdev)
>  
>  err5:
>  	dwc3_debugfs_exit(dwc);
> +
>  	dwc3_event_buffers_cleanup(dwc);
>  
>  	usb_phy_set_suspend(dwc->usb2_phy, 1);
>  	usb_phy_set_suspend(dwc->usb3_phy, 1);
> -	phy_power_off(dwc->usb2_generic_phy);
> -	phy_power_off(dwc->usb3_generic_phy);
> +
> +	for (i = 0; i < dwc->num_ports; i++) {
> +		phy_power_off(dwc->usb2_generic_phy[i]);
> +		phy_power_off(dwc->usb3_generic_phy[i]);
> +	}
>  
>  	usb_phy_shutdown(dwc->usb2_phy);
>  	usb_phy_shutdown(dwc->usb3_phy);
> -	phy_exit(dwc->usb2_generic_phy);
> -	phy_exit(dwc->usb3_generic_phy);
> +
> +	for (i = 0; i < dwc->num_ports; i++) {
> +		phy_exit(dwc->usb2_generic_phy[i]);
> +		phy_exit(dwc->usb3_generic_phy[i]);
> +	}
>  
>  	dwc3_ulpi_exit(dwc);
>  
> @@ -2025,6 +2161,7 @@ static int dwc3_core_init_for_resume(struct dwc3 *dwc)
>  
>  static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
>  {
> +	int i;
>  	unsigned long	flags;
>  	u32 reg;
>  
> @@ -2045,17 +2182,21 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)
>  		/* Let controller to suspend HSPHY before PHY driver suspends */
>  		if (dwc->dis_u2_susphy_quirk ||
>  		    dwc->dis_enblslpm_quirk) {
> -			reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
> -			reg |=  DWC3_GUSB2PHYCFG_ENBLSLPM |
> -				DWC3_GUSB2PHYCFG_SUSPHY;
> -			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
> +			for (i = 0; i < dwc->num_ports; i++) {
> +				reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(i));
> +				reg |=  DWC3_GUSB2PHYCFG_ENBLSLPM |
> +					DWC3_GUSB2PHYCFG_SUSPHY;
> +				dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(i), reg);
> +			}
>  
>  			/* Give some time for USB2 PHY to suspend */
>  			usleep_range(5000, 6000);
>  		}
>  
> -		phy_pm_runtime_put_sync(dwc->usb2_generic_phy);
> -		phy_pm_runtime_put_sync(dwc->usb3_generic_phy);
> +		for (i = 0; i < dwc->num_ports; i++) {
> +			phy_pm_runtime_put_sync(dwc->usb2_generic_phy[i]);
> +			phy_pm_runtime_put_sync(dwc->usb3_generic_phy[i]);
> +		}
>  		break;
>  	case DWC3_GCTL_PRTCAP_OTG:
>  		/* do nothing during runtime_suspend */
> @@ -2084,6 +2225,7 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
>  {
>  	unsigned long	flags;
>  	int		ret;
> +	int		i;
>  	u32		reg;
>  
>  	switch (dwc->current_dr_role) {
> @@ -2104,17 +2246,21 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg)
>  			break;
>  		}
>  		/* Restore GUSB2PHYCFG bits that were modified in suspend */
> -		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
> -		if (dwc->dis_u2_susphy_quirk)
> -			reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
> +		for (i = 0; i < dwc->num_ports; i++) {
> +			reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(i));
> +			if (dwc->dis_u2_susphy_quirk)
> +				reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;
>  
> -		if (dwc->dis_enblslpm_quirk)
> -			reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
> +			if (dwc->dis_enblslpm_quirk)
> +				reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;
>  
> -		dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
> +			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(i), reg);
> +		}
>  
> -		phy_pm_runtime_get_sync(dwc->usb2_generic_phy);
> -		phy_pm_runtime_get_sync(dwc->usb3_generic_phy);
> +		for (i = 0; i < dwc->num_ports; i++) {
> +			phy_pm_runtime_get_sync(dwc->usb2_generic_phy[i]);
> +			phy_pm_runtime_get_sync(dwc->usb3_generic_phy[i]);
> +		}
>  		break;
>  	case DWC3_GCTL_PRTCAP_OTG:
>  		/* nothing to do on runtime_resume */
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 8f9959ba9fd4..2f82eda9d44f 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -35,6 +35,9 @@
>  
>  #define DWC3_MSG_MAX	500
>  
> +/* Number of ports supported by a multiport controller */
> +#define MAX_PORTS_SUPPORTED	4
> +
>  /* Global constants */
>  #define DWC3_PULL_UP_TIMEOUT	500	/* ms */
>  #define DWC3_BOUNCE_SIZE	1024	/* size of a superspeed bulk */
> @@ -1023,8 +1026,10 @@ struct dwc3_scratchpad_array {
>   * @usb_psy: pointer to power supply interface.
>   * @usb2_phy: pointer to USB2 PHY
>   * @usb3_phy: pointer to USB3 PHY
> - * @usb2_generic_phy: pointer to USB2 PHY
> - * @usb3_generic_phy: pointer to USB3 PHY
> + * @num_ports: Indicates number of usb ports supported by the controller.

Note that this is the total number of usb ports including the SS capable
ones.

> + * @num_ss_ports: Indicates number of ss capable ports supported by controller
> + * @usb2_generic_phy: pointer to array of USB2 PHY's
> + * @usb3_generic_phy: pointer to array of USB3 PHY's
>   * @phys_ready: flag to indicate that PHYs are ready
>   * @ulpi: pointer to ulpi interface
>   * @ulpi_ready: flag to indicate that ULPI is initialized
> @@ -1157,8 +1162,10 @@ struct dwc3 {
>  	struct usb_phy		*usb2_phy;
>  	struct usb_phy		*usb3_phy;
>  
> -	struct phy		*usb2_generic_phy;
> -	struct phy		*usb3_generic_phy;
> +	u32			num_ports;
> +	u32			num_ss_ports;
> +	struct phy		*usb2_generic_phy[MAX_PORTS_SUPPORTED];
> +	struct phy		*usb3_generic_phy[MAX_PORTS_SUPPORTED];
>  
>  	bool			phys_ready;
>  
> diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
> index 039bf241769a..ea86ff01433b 100644
> --- a/drivers/usb/dwc3/drd.c
> +++ b/drivers/usb/dwc3/drd.c
> @@ -327,7 +327,7 @@ static void dwc3_otg_device_exit(struct dwc3 *dwc)
>  
>  void dwc3_otg_update(struct dwc3 *dwc, bool ignore_idstatus)
>  {
> -	int ret;
> +	int ret, i;
>  	u32 reg;
>  	int id;
>  	unsigned long flags;
> @@ -386,9 +386,11 @@ void dwc3_otg_update(struct dwc3 *dwc, bool ignore_idstatus)
>  		} else {
>  			if (dwc->usb2_phy)
>  				otg_set_vbus(dwc->usb2_phy->otg, true);
> -			if (dwc->usb2_generic_phy)
> -				phy_set_mode(dwc->usb2_generic_phy,
> -					     PHY_MODE_USB_HOST);
> +			for (i = 0; i < dwc->num_ports; i++) {
> +				if (dwc->usb2_generic_phy[i])
> +					phy_set_mode(dwc->usb2_generic_phy[i],
> +						     PHY_MODE_USB_HOST);
> +			}
>  		}
>  		break;
>  	case DWC3_OTG_ROLE_DEVICE:
> @@ -400,8 +402,8 @@ void dwc3_otg_update(struct dwc3 *dwc, bool ignore_idstatus)
>  
>  		if (dwc->usb2_phy)
>  			otg_set_vbus(dwc->usb2_phy->otg, false);
> -		if (dwc->usb2_generic_phy)
> -			phy_set_mode(dwc->usb2_generic_phy,
> +		if (dwc->usb2_generic_phy[0])
> +			phy_set_mode(dwc->usb2_generic_phy[0],
>  				     PHY_MODE_USB_DEVICE);
>  		ret = dwc3_gadget_init(dwc);
>  		if (ret)
> -- 
> 2.39.0
> 

No major issue I see here. Just some minor nits. Once you feel it's
ready, please drop the RFC tags on resubmission.

Thanks,
Thinh




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