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usb: xhci-dwc3: Support role switch default role

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When the device tree indicates support for role switching through
the "usb-role-switch" property, take the "role-switch-default-mode"
property into account when deciding which role to put the
controller into.

This makes USB devices work on Apple M1 systems where the device
tree may include a "dr_mode" property that is set to "otg", but
where we need to put the controller into "host" mode to see
devices connected to the type-C ports.

Signed-off-by: Mark Kettenis <kettenis@openbsd.org>
This commit is contained in:
Mark Kettenis 2022-04-19 21:06:33 +02:00 committed by Marek Vasut
parent f83bd23e2a
commit 6a6468f479
3 changed files with 32 additions and 0 deletions
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16
drivers/usb/common/common.c
View File

@ -40,6 +40,22 @@ enum usb_dr_mode usb_get_dr_mode(ofnode node)
return USB_DR_MODE_UNKNOWN;
}
enum usb_dr_mode usb_get_role_switch_default_mode(ofnode node)
{
const char *dr_mode;
int i;
dr_mode = ofnode_read_string(node, "role-switch-default-mode");
if (!dr_mode)
return USB_DR_MODE_UNKNOWN;
for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
if (!strcmp(dr_mode, usb_dr_modes[i]))
return i;
return USB_DR_MODE_UNKNOWN;
}
static const char *const speed_names[] = {
[USB_SPEED_UNKNOWN] = "UNKNOWN",
[USB_SPEED_LOW] = "low-speed",

6
drivers/usb/host/xhci-dwc3.c
View File

@ -209,6 +209,12 @@ static int xhci_dwc3_probe(struct udevice *dev)
writel(reg, &dwc3_reg->g_usb2phycfg[0]);
dr_mode = usb_get_dr_mode(dev_ofnode(dev));
if (dr_mode == USB_DR_MODE_OTG &&
dev_read_bool(dev, "usb-role-switch")) {
dr_mode = usb_get_role_switch_default_mode(dev_ofnode(dev));
if (dr_mode == USB_DR_MODE_UNKNOWN)
dr_mode = USB_DR_MODE_OTG;
}
if (dr_mode == USB_DR_MODE_UNKNOWN)
/* by default set dual role mode to HOST */
dr_mode = USB_DR_MODE_HOST;

10
include/linux/usb/otg.h
View File

@ -27,6 +27,16 @@ enum usb_dr_mode {
*/
enum usb_dr_mode usb_get_dr_mode(ofnode node);
/**
* usb_get_dr_mode() - Get dual role mode for given device
* @node: ofnode of the given device
*
* The function gets phy interface string from property
* 'role-switch-defaulr-mode', and returns the correspondig enum
* usb_dr_mode
*/
enum usb_dr_mode usb_get_role_switch_default_mode(ofnode node);
/**
* usb_get_maximum_speed() - Get maximum speed for given device
* @node: ofnode of the given device