Enable support for the fusb302 USB Type-C controller.
This will do early USB PD (power deliver) negotiation, which must happen within 5 seconds after the USB-C connector has plugged in according to the specification. It takes almost 5 seconds to go through the bootchain on Rock 5B and jump to the operating system. When the Linux initializes the fusb302 usually 20-30 seconds have gone since the device has been plugged, which is far too late. The USB PD power source reacts with a hard reset, which disables VBUS for some time. This is not a problem for a battery driven device, but Rock 5B will loose its power-supply and reset. By initializing PD in U-Boot, this can be avoided.
Signed-off-by: Sebastian Reichel sebastian.reichel@collabora.com --- board/radxa/rock5b-rk3588/Makefile | 6 ++++ board/radxa/rock5b-rk3588/rock5b-rk3588.c | 35 +++++++++++++++++++++++ 2 files changed, 41 insertions(+) create mode 100644 board/radxa/rock5b-rk3588/Makefile create mode 100644 board/radxa/rock5b-rk3588/rock5b-rk3588.c
diff --git a/board/radxa/rock5b-rk3588/Makefile b/board/radxa/rock5b-rk3588/Makefile new file mode 100644 index 000000000000..95d813596da4 --- /dev/null +++ b/board/radxa/rock5b-rk3588/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0+ +# +# Copyright (c) 2022 Collabora Ltd. +# + +obj-y += rock5b-rk3588.o diff --git a/board/radxa/rock5b-rk3588/rock5b-rk3588.c b/board/radxa/rock5b-rk3588/rock5b-rk3588.c new file mode 100644 index 000000000000..1c17ae93c76c --- /dev/null +++ b/board/radxa/rock5b-rk3588/rock5b-rk3588.c @@ -0,0 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2023-2024 Collabora Ltd. + */ + +#include <usb/tcpm.h> + +#ifdef CONFIG_MISC_INIT_R +int misc_init_r(void) +{ + struct udevice *dev; + int ret; + + /* + * This will do early USB PD (power deliver) negotiation, which must + * happen within 5 seconds after the USB-C connector has plugged in + * according to the specification. It takes almost 5 seconds to go + * through the bootchain on Rock 5B and jump to the operating system. + * When the Linux initializes the fusb302 usually 20-30 seconds have + * gone since the device has been plugged, which is far too late. + * + * The USB PD power source reacts with a hard reset, which disables + * VBUS for some time. This is not a problem for a battery driven + * device, but Rock 5B will loose its power-supply and reset. By + * initializing PD in U-Boot, this can be avoided. + */ + ret = tcpm_get("usb-typec@22", &dev); + if (ret) { + printf("Failed to probe Type-C controller\n"); + return 0; + } + + return 0; +} +#endif