On 01/26/2016 07:14 PM, Marek Vasut wrote:
Certain processor architectures, like MIPS, require that the USB structures and transfer buffers are passed with their PA to the USB controller. If VA is passed, the USB will not work. Add the necessary virt_to_phys() calls into the USB EHCI code to make it work.
FYI, this causes some cast size warnings, e.g.:
+make O=/home/swarren/shared/git_wa/tegra-uboot-flasher/u-boot/build-p2371-2180 -s p2371-2180_defconfig +make O=/home/swarren/shared/git_wa/tegra-uboot-flasher/u-boot/build-p2371-2180 -s -j8 In file included from ../arch/arm/include/asm/byteorder.h:29:0, from ../include/compiler.h:125, from ../include/image.h:19, from ../include/common.h:88, from ../drivers/usb/host/ehci-hcd.c:10: ../drivers/usb/host/ehci-hcd.c: In function ‘ehci_td_buffer’: ../drivers/usb/host/ehci-hcd.c:248:49: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] td->qt_buffer[idx] = cpu_to_hc32(virt_to_phys((void *)addr)); ^ ../include/linux/byteorder/little_endian.h:34:51: note: in definition of macro ‘__cpu_to_le32’ #define __cpu_to_le32(x) ((__force __le32)(__u32)(x)) ^ ../drivers/usb/host/ehci-hcd.c:248:24: note: in expansion of macro ‘cpu_to_hc32’ td->qt_buffer[idx] = cpu_to_hc32(virt_to_phys((void *)addr)); ^
(This is a 64-bit ARM platform, so I had CROSS_COMPILE=aarch64-linux-gnu-)