Add a quirk "USB_QUIRK_STRING_FETCH_255", borrowed from Linux kernel to fetch string using descriptor length then fetch actual bytes returned in descriptor buffer.
Signed-off-by: Puneet Saxena puneets@nvidia.com --- Changes for v2: - Add quirk for fetching actual bytes
common/usb.c | 4 ++++ include/configs/tegra2-common.h | 7 +++++++ 2 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/common/usb.c b/common/usb.c index 75926aa..cd85c18 100644 --- a/common/usb.c +++ b/common/usb.c @@ -660,7 +660,11 @@ static int usb_string_sub(struct usb_device *dev, unsigned int langid,
/* Try to read the string descriptor by asking for the maximum * possible number of bytes */ +#ifdef USB_QUIRK_STRING_FETCH_255 + rc = -4; +#else rc = usb_get_string(dev, langid, index, buf, 255); +#endif
/* If that failed try to read the descriptor length, then * ask for just that many bytes */ diff --git a/include/configs/tegra2-common.h b/include/configs/tegra2-common.h index 266d0e5..51cc200 100644 --- a/include/configs/tegra2-common.h +++ b/include/configs/tegra2-common.h @@ -172,4 +172,11 @@
#define CONFIG_TEGRA2_GPIO #define CONFIG_CMD_GPIO + +/* + * Imported the quirk from Linux kernel + */ +/* string descriptors must not be fetched using a 255-byte read */ +#define USB_QUIRK_STRING_FETCH_255 0x00000001 + #endif /* __TEGRA2_COMMON_H */