Add CONFIG_QCOM_USB_FIXUP option to allow platforms to disable the USB speed limitation fixup when they have proper super-speed USB support in U-Boot.
Currently, U-Boot limits USB to high-speed mode on all Qualcomm platforms by fixing up the device tree at runtime. This was necessary because most platforms lacked super-speed PHY drivers. However, newer platforms now have proper QMP PHY drivers that support super-speed USB. For these platforms, the fixup is counterproductive as it prevents the hardware from operating at its full capability. This change: - Adds CONFIG_QCOM_USB_FIXUP (default y) to maintain backward compatibility with existing platforms - Wraps the fixup code with #ifdef to allow selective disabling - Allows platforms with super-speed support to disable the fixup via their defconfig Platforms without super-speed PHY drivers will continue to work as before with the fixup enabled by default. Signed-off-by: Balaji Selvanathan <[email protected]> --- arch/arm/mach-snapdragon/Kconfig | 10 ++++++++++ arch/arm/mach-snapdragon/of_fixup.c | 4 ++++ 2 files changed, 14 insertions(+) diff --git a/arch/arm/mach-snapdragon/Kconfig b/arch/arm/mach-snapdragon/Kconfig index 976c0e35fce..6c53aeef597 100644 --- a/arch/arm/mach-snapdragon/Kconfig +++ b/arch/arm/mach-snapdragon/Kconfig @@ -29,6 +29,16 @@ config SYS_MALLOC_LEN config LNX_KRNL_IMG_TEXT_OFFSET_BASE default 0x80000000 +config QCOM_USB_FIXUP + bool "Enable USB speed fixup for Qualcomm platforms" + default y + help + Enable runtime fixup of USB device tree nodes to limit USB to + high-speed mode. This is needed on some Qualcomm platforms where + U-Boot doesn't support super-speed USB. + Disable this for platforms that have proper super-speed USB support + in U-Boot. + config SYS_BOARD string "Snapdragon SoCs based board" help diff --git a/arch/arm/mach-snapdragon/of_fixup.c b/arch/arm/mach-snapdragon/of_fixup.c index eec2c0c757e..6a64168f67e 100644 --- a/arch/arm/mach-snapdragon/of_fixup.c +++ b/arch/arm/mach-snapdragon/of_fixup.c @@ -27,6 +27,7 @@ #include <stdlib.h> #include <time.h> +#ifdef CONFIG_QCOM_USB_FIXUP /* U-Boot only supports USB high-speed mode on Qualcomm platforms with DWC3 * USB controllers. Rather than requiring source level DT changes, we fix up * DT here. This improves compatibility with upstream DT and simplifies the @@ -115,6 +116,7 @@ static void fixup_usb_nodes(struct device_node *root) log_warning("Failed to fixup node %s: %d\n", glue_np->name, ret); } } +#endif /* Remove all references to the rpmhpd device */ static void fixup_power_domains(struct device_node *root) @@ -157,7 +159,9 @@ static int qcom_of_fixup_nodes(void * __maybe_unused ctx, struct event *event) { struct device_node *root = event->data.of_live_built.root; +#ifdef CONFIG_QCOM_USB_FIXUP time_call(fixup_usb_nodes, root); +#endif time_call(fixup_power_domains, root); return 0; -- 2.34.1
