fix(drivers/usb): add a optional ops get_other_speed_config_desc
Correctly handle USB_DESC_TYPE_OTHER_SPEED_CONFIGURATION request
in USB driver and support a different result than
USB_DESC_TYPE_CONFIGURATION with the new optional ops
get_other_speed_config_desc().
The support of this descriptor is optionnal and is only
required when high-speed capable device which can operate at its
other possible speed.
This patch allows to remove the pbuf update in usb_core_get_desc()
and solves an issue on USB re-enumeration on STM32MP15 platform
as the result of get_config_desc() is a const array.
This issue is not see on normal use-case, as the USB enumeration
is only done in ROM code and TF-A reuse the same USB descritors.
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Change-Id: I8edcc1e45065ab4e45d48f4bc37b49120674fdb0
diff --git a/drivers/usb/usb_device.c b/drivers/usb/usb_device.c
index 7fcb39b..7dd3f60 100644
--- a/drivers/usb/usb_device.c
+++ b/drivers/usb/usb_device.c
@@ -74,7 +74,6 @@
case USB_DESC_TYPE_CONFIGURATION:
pbuf = pdev->desc->get_config_desc(&len);
- pbuf[1] = USB_DESC_TYPE_CONFIGURATION;
break;
case USB_DESC_TYPE_STRING:
@@ -116,8 +115,11 @@
break;
case USB_DESC_TYPE_OTHER_SPEED_CONFIGURATION:
- pbuf = pdev->desc->get_config_desc(&len);
- pbuf[1] = USB_DESC_TYPE_OTHER_SPEED_CONFIGURATION;
+ if (pdev->desc->get_other_speed_config_desc == NULL) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+ pbuf = pdev->desc->get_other_speed_config_desc(&len);
break;
default:
diff --git a/include/drivers/usb_device.h b/include/drivers/usb_device.h
index e21e315..8fdb6ae 100644
--- a/include/drivers/usb_device.h
+++ b/include/drivers/usb_device.h
@@ -166,6 +166,8 @@
uint8_t *(*get_usr_desc)(uint8_t index, uint16_t *length);
uint8_t *(*get_config_desc)(uint16_t *length);
uint8_t *(*get_device_qualifier_desc)(uint16_t *length);
+ /* optional: high speed capable device operating at its other speed */
+ uint8_t *(*get_other_speed_config_desc)(uint16_t *length);
};
/* USB Device handle structure */
diff --git a/plat/st/stm32mp1/stm32mp1_usb_dfu.c b/plat/st/stm32mp1/stm32mp1_usb_dfu.c
index 051d435..70fbba6 100644
--- a/plat/st/stm32mp1/stm32mp1_usb_dfu.c
+++ b/plat/st/stm32mp1/stm32mp1_usb_dfu.c
@@ -338,6 +338,8 @@
.get_usr_desc = stm32mp1_get_usr_desc,
.get_config_desc = stm32mp1_get_config_desc,
.get_device_qualifier_desc = stm32mp1_get_qualifier_desc,
+ /* only HS is supported, as ROM code */
+ .get_other_speed_config_desc = NULL,
};
static struct usb_handle usb_core_handle;
