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usb: gadget: udc: renesas_usb3: Add role switch support for RZ/V2M

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As RZ/V2M has both HOST and PERI reset module, we need to do reset release
before accessing registers in respective IP module.

This patch adds role switch support for RZ/V2M.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20230121145853.4792-7-biju.das.jz@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Biju Das
2023-01-21 14:58:47 +00:00
committed by Greg Kroah-Hartman
parent 9cad72dfc5
commit 3827fa1ef3
1 changed files with 29 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/usb/gadget/udc/renesas_usb3.c
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@@ -7,6 +7,7 @@
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/extcon-provider.h>
@@ -2366,6 +2367,9 @@ static int renesas_usb3_start(struct usb_gadget *gadget,
usb3 = gadget_to_renesas_usb3(gadget);
if (usb3->is_rzv2m && usb3_is_a_device(usb3))
return -EBUSY;
/* hook up the driver */
usb3->driver = driver;
@@ -2374,6 +2378,10 @@ static int renesas_usb3_start(struct usb_gadget *gadget,
pm_runtime_get_sync(usb3_to_dev(usb3));
/* Peripheral Reset */
if (usb3->is_rzv2m)
rzv2m_usb3drd_reset(usb3_to_dev(usb3)->parent, false);
renesas_usb3_init_controller(usb3);
return 0;
@@ -2386,8 +2394,10 @@ static int renesas_usb3_stop(struct usb_gadget *gadget)
usb3->softconnect = false;
usb3->gadget.speed = USB_SPEED_UNKNOWN;
usb3->driver = NULL;
renesas_usb3_stop_controller(usb3);
if (usb3->is_rzv2m)
rzv2m_usb3drd_reset(usb3_to_dev(usb3)->parent, false);
renesas_usb3_stop_controller(usb3);
if (usb3->phy)
phy_exit(usb3->phy);
@@ -2447,18 +2457,29 @@ static void handle_ext_role_switch_states(struct device *dev,
switch (role) {
case USB_ROLE_NONE:
usb3->connection_state = USB_ROLE_NONE;
if (cur_role == USB_ROLE_HOST)
if (!usb3->is_rzv2m && cur_role == USB_ROLE_HOST)
device_release_driver(host);
if (usb3->driver)
if (usb3->driver) {
if (usb3->is_rzv2m)
rzv2m_usb3drd_reset(dev->parent, false);
usb3_disconnect(usb3);
}
usb3_vbus_out(usb3, false);
if (usb3->is_rzv2m) {
rzv2m_usb3drd_reset(dev->parent, true);
device_release_driver(host);
}
break;
case USB_ROLE_DEVICE:
if (usb3->connection_state == USB_ROLE_NONE) {
usb3->connection_state = USB_ROLE_DEVICE;
usb3_set_mode(usb3, false);
if (usb3->driver)
if (usb3->driver) {
if (usb3->is_rzv2m)
renesas_usb3_init_controller(usb3);
usb3_connect(usb3);
}
} else if (cur_role == USB_ROLE_HOST) {
device_release_driver(host);
usb3_set_mode(usb3, false);
@@ -2469,8 +2490,11 @@ static void handle_ext_role_switch_states(struct device *dev,
break;
case USB_ROLE_HOST:
if (usb3->connection_state == USB_ROLE_NONE) {
if (usb3->driver)
if (usb3->driver) {
if (usb3->is_rzv2m)
rzv2m_usb3drd_reset(dev->parent, false);
usb3_disconnect(usb3);
}
usb3->connection_state = USB_ROLE_HOST;
usb3_set_mode(usb3, true);