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Message-ID: <20230408013753.x4awmbg2pzro4fqr@synopsys.com>
Date: Sat, 8 Apr 2023 01:38:00 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Krishna Kurapati <quic_kriskura@...cinc.com>
CC: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Andy Gross <agross@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"quic_pkondeti@...cinc.com" <quic_pkondeti@...cinc.com>,
"quic_ppratap@...cinc.com" <quic_ppratap@...cinc.com>,
"quic_wcheng@...cinc.com" <quic_wcheng@...cinc.com>,
"quic_jackp@...cinc.com" <quic_jackp@...cinc.com>,
"quic_harshq@...cinc.com" <quic_harshq@...cinc.com>,
"ahalaney@...hat.com" <ahalaney@...hat.com>,
"quic_shazhuss@...cinc.com" <quic_shazhuss@...cinc.com>
Subject: Re: [PATCH v6 2/8] usb: dwc3: core: Access XHCI address space
temporarily to read port info
On Wed, Apr 05, 2023, Krishna Kurapati wrote:
> Currently host-only capable DWC3 controllers support Multiport. Temporarily
> map XHCI address space for host-only controllers and parse XHCI Extended
> Capabilities registers to read number of usb2 ports and usb3 ports present on
> multiport controller. Each USB Port is atleast HS capable.
>
> The port info for usb2 and usb3 phy are identified as num_usb2_ports and
> num_usb3_ports. The intention is as follows:
>
> Wherever we need to perform phy operations like:
>
> LOOP_OVER_NUMBER_OF_AVAILABLE_PORTS()
> {
> 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 number of usb2 ports is 3, loop can go from index 0-2 for usb2_generic_phy.
> If number of usb3-ports is 2, we don't know for sure, if the first 2 ports are
> SS capable or some other ports like (2 and 3) are SS capable. So instead,
> num_usb2_ports is used to loop around all phy's (both hs and ss) for
> performing phy operations. If any usb3_generic_phy turns out to be NULL, phy
> operation just bails out.
>
> num_usb3_ports is used to modify GUSB3PIPECTL registers while setting up
> phy's as we need to know how many SS capable ports are there for this.
>
> Signed-off-by: Krishna Kurapati <quic_kriskura@...cinc.com>
> ---
> Link to v5: https://urldefense.com/v3/__https://lore.kernel.org/all/20230310163420.7582-3-quic_kriskura@quicinc.com/__;!!A4F2R9G_pg!eXaKJejrT053M_6af46mC8jjyBmdZBBhJ0bVKlyxFiIMR_V1RwlBs_9VdvXhpJuNBDHi0d8kdZDrI0MdFKnKA6VA0i6Fww$
>
> drivers/usb/dwc3/core.c | 69 +++++++++++++++++++++++++++++++++++++++++
> drivers/usb/dwc3/core.h | 60 +++++++++++++++++++++++++++++++++++
> 2 files changed, 129 insertions(+)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 476b63618511..567ae79389a1 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1750,6 +1750,60 @@ static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
> return edev;
> }
>
> +static int dwc3_read_port_info(struct dwc3 *dwc)
> +{
> + void __iomem *regs;
> + u32 offset;
> + u32 temp;
> + u8 major_revision;
> + int ret = 0;
> +
> + /*
> + * Remap xHCI address space to access XHCI ext cap regs,
> + * since it is needed to get port info.
> + */
> + regs = ioremap(dwc->xhci_resources[0].start,
> + resource_size(&dwc->xhci_resources[0]));
> + if (IS_ERR(regs)) {
> + return PTR_ERR(regs);
> + }
> +
> + offset = dwc3_xhci_find_next_ext_cap(regs, 0,
> + XHCI_EXT_CAPS_PROTOCOL);
> + while (offset) {
> + temp = readl(regs + offset);
> + major_revision = XHCI_EXT_PORT_MAJOR(temp);;
> +
> + temp = readl(regs + offset + 0x08);
> + if (major_revision == 0x03) {
> + dwc->num_usb3_ports += XHCI_EXT_PORT_COUNT(temp);
> + } else if (major_revision <= 0x02) {
> + dwc->num_usb2_ports += XHCI_EXT_PORT_COUNT(temp);
> + } else {
> + dev_err(dwc->dev, "port revision seems wrong\n");
> + ret = -EINVAL;
> + goto unmap_reg;
> + }
> +
> + offset = dwc3_xhci_find_next_ext_cap(regs, offset,
> + XHCI_EXT_CAPS_PROTOCOL);
> + }
> +
> + temp = readl(regs + DWC3_XHCI_HCSPARAMS1);
> + if (HCS_MAX_PORTS(temp) != (dwc->num_usb3_ports + dwc->num_usb2_ports)) {
> + dev_err(dwc->dev, "inconsistency in port info\n");
> + ret = -EINVAL;
> + goto unmap_reg;
> + }
> +
> + dev_dbg(dwc->dev,
> + "hs-ports: %d ss-ports: %d\n", dwc->num_usb2_ports, dwc->num_usb3_ports);
> +
> +unmap_reg:
> + iounmap(regs);
> + return ret;
> +}
> +
> static int dwc3_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -1757,6 +1811,7 @@ static int dwc3_probe(struct platform_device *pdev)
> struct dwc3 *dwc;
>
> int ret;
> + unsigned int hw_mode;
>
> void __iomem *regs;
>
> @@ -1880,6 +1935,20 @@ static int dwc3_probe(struct platform_device *pdev)
> goto disable_clks;
> }
>
> + /*
> + * Currently DWC3 controllers that are host-only capable
> + * support Multiport
> + */
> + hw_mode = DWC3_GHWPARAMS0_MODE(dwc->hwparams.hwparams0);
> + if (hw_mode == DWC3_GHWPARAMS0_MODE_HOST) {
> + ret = dwc3_read_port_info(dwc);
> + if (ret)
> + goto disable_clks;
> + } else {
> + dwc->num_usb2_ports = 1;
> + dwc->num_usb3_ports = 1;
> + }
> +
> spin_lock_init(&dwc->lock);
> mutex_init(&dwc->mutex);
>
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index 4743e918dcaf..229b7da8c5bc 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -35,6 +35,17 @@
>
> #define DWC3_MSG_MAX 500
>
> +/* Define XHCI Extcap register offsets for getting multiport info */
> +#define XHCI_HCC_PARAMS_OFFSET 0x10
> +#define DWC3_XHCI_HCSPARAMS1 0x04
> +#define XHCI_EXT_CAPS_PROTOCOL 2
> +#define XHCI_HCC_EXT_CAPS(p) (((p)>>16)&0xffff)
> +#define XHCI_EXT_CAPS_ID(p) (((p)>>0)&0xff)
> +#define XHCI_EXT_CAPS_NEXT(p) (((p)>>8)&0xff)
Fix these spacing and naming inconsistency (x vs p).
> +#define XHCI_EXT_PORT_MAJOR(x) (((x) >> 24) & 0xff)
> +#define XHCI_EXT_PORT_COUNT(x) (((x) >> 8) & 0xff)
> +#define HCS_MAX_PORTS(p) (((p) >> 24) & 0x7f)
> +
> /* Global constants */
> #define DWC3_PULL_UP_TIMEOUT 500 /* ms */
> #define DWC3_BOUNCE_SIZE 1024 /* size of a superspeed bulk */
> @@ -1023,6 +1034,10 @@ struct dwc3_scratchpad_array {
> * @usb_psy: pointer to power supply interface.
> * @usb2_phy: pointer to USB2 PHY
> * @usb3_phy: pointer to USB3 PHY
> + * @num_usb2_ports: Indicates the number of usb2 ports to be serviced by the
> + * controller.
Can we just say "number of usb2 ports".
> + * @num_usb3_ports: Indicates the number of usb3 ports to be serviced by the
> + * controller.
> * @usb2_generic_phy: pointer to USB2 PHY
> * @usb3_generic_phy: pointer to USB3 PHY
> * @phys_ready: flag to indicate that PHYs are ready
> @@ -1158,6 +1173,8 @@ struct dwc3 {
> struct usb_phy *usb2_phy;
> struct usb_phy *usb3_phy;
>
> + u32 num_usb2_ports;
> + u32 num_usb3_ports;
> struct phy *usb2_generic_phy;
> struct phy *usb3_generic_phy;
>
> @@ -1645,4 +1662,47 @@ static inline void dwc3_ulpi_exit(struct dwc3 *dwc)
> { }
> #endif
>
> +/**
> + * Find the offset of the extended capabilities with capability ID id.
> + *
> + * @base PCI MMIO registers base address.
> + * @start address at which to start looking, (0 or HCC_PARAMS to start at
> + * beginning of list)
> + * @id Extended capability ID to search for, or 0 for the next
> + * capability
> + *
> + * Returns the offset of the next matching extended capability structure.
> + * Some capabilities can occur several times, e.g., the XHCI_EXT_CAPS_PROTOCOL,
> + * and this provides a way to find them all.
> + */
Documentation style is different?
> +
> +static inline int dwc3_xhci_find_next_ext_cap(void __iomem *base, u32 start, int id)
> +{
> + u32 val;
> + u32 next;
> + u32 offset;
> +
> + offset = start;
> + if (!start || start == XHCI_HCC_PARAMS_OFFSET) {
> + val = readl(base + XHCI_HCC_PARAMS_OFFSET);
> + if (val == ~0)
> + return 0;
> + offset = XHCI_HCC_EXT_CAPS(val) << 2;
> + if (!offset)
> + return 0;
> + }
> + do {
> + val = readl(base + offset);
> + if (val == ~0)
> + return 0;
> + if (offset != start && (id == 0 || XHCI_EXT_CAPS_ID(val) == id))
> + return offset;
> +
> + next = XHCI_EXT_CAPS_NEXT(val);
> + offset += next << 2;
> + } while (next);
> +
> + return 0;
> +}
> +
> #endif /* __DRIVERS_USB_DWC3_CORE_H */
> --
> 2.40.0
>
My checkpatch reports some errors. Can you check?
Thanks,
Thinh
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