This is an automated email from Gerrit. Andrey Yurovsky ([email protected]) just uploaded a new patch set to Gerrit, which you can find at http://openocd.zylin.com/1561
-- gerrit commit 063f4ac27b37a8af6049bdaa3cdb98a41292c911 Author: Andrey Smirnov <[email protected]> Date: Tue Aug 20 12:26:19 2013 -0700 stlink: Add workaround for intermittent FW info retrieval failure It appears that on some host USB configurations(2012 MacBook Air) multiple restarts of openocd tool cause the FW on STLINKv2 dongle to go into a weird state in which it will no longer respond to STLINK_GET_VERSION command. This patch adds code that, if said request fails for the first time, attempts to reset the device and retry to initialize it and obtain FW information one more time. Change-Id: I7227fc972adb49d52ae700ad48ab9f66b2aaa72c Signed-off-by: Andrey Smirnov <[email protected]> diff --git a/src/jtag/drivers/libusb0_common.h b/src/jtag/drivers/libusb0_common.h index 362235f..bea743d 100644 --- a/src/jtag/drivers/libusb0_common.h +++ b/src/jtag/drivers/libusb0_common.h @@ -47,6 +47,12 @@ static inline int jtag_libusb_claim_interface(jtag_libusb_device_handle *devh, return usb_claim_interface(devh, iface); }; +static inline int jtag_libusb_release_interface(jtag_libusb_device_handle *devh, + int iface) +{ + return usb_release_interface(devh, iface); +} + int jtag_libusb_open(const uint16_t vids[], const uint16_t pids[], struct jtag_libusb_device_handle **out); void jtag_libusb_close(jtag_libusb_device_handle *dev); diff --git a/src/jtag/drivers/libusb1_common.h b/src/jtag/drivers/libusb1_common.h index 8b2792c..cd1f7f1 100644 --- a/src/jtag/drivers/libusb1_common.h +++ b/src/jtag/drivers/libusb1_common.h @@ -41,6 +41,12 @@ static inline int jtag_libusb_claim_interface(jtag_libusb_device_handle *devh, return libusb_claim_interface(devh, iface); }; +static inline int jtag_libusb_release_interface(jtag_libusb_device_handle *devh, + int iface) +{ + return libusb_release_interface(devh, iface); +} + int jtag_libusb_open(const uint16_t vids[], const uint16_t pids[], struct jtag_libusb_device_handle **out); void jtag_libusb_close(jtag_libusb_device_handle *dev); diff --git a/src/jtag/drivers/stlink_usb.c b/src/jtag/drivers/stlink_usb.c index 1f3fbe2..f02fa4c 100644 --- a/src/jtag/drivers/stlink_usb.c +++ b/src/jtag/drivers/stlink_usb.c @@ -1447,7 +1447,7 @@ static int stlink_usb_close(void *fd) /** */ static int stlink_usb_open(struct hl_interface_param_s *param, void **fd) { - int err; + int err, retry_count = 1; struct stlink_usb_handle_s *h; enum stlink_jtag_api_version api; @@ -1471,35 +1471,69 @@ static int stlink_usb_open(struct hl_interface_param_s *param, void **fd) LOG_DEBUG("transport: %d vid: 0x%04x pid: 0x%04x", param->transport, param->vid, param->pid); - if (jtag_libusb_open(vids, pids, &h->fd) != ERROR_OK) { - LOG_ERROR("open failed"); - goto error_open; - } + /* + On certain host USB configurations(e.g. MacBook Air) + STLINKv2 dongle seems to have its FW in a funky state if, + after plugging it in, you try to use openocd with it more + then once (by launching and closing openocd). In cases like + that initial attempt to read the FW info via + stlink_usb_version will fail and the device has to be reset + in order to become operational. + */ + do { + if (jtag_libusb_open(vids, pids, &h->fd) != ERROR_OK) { + LOG_ERROR("open failed"); + goto error_open; + } - jtag_libusb_set_configuration(h->fd, 0); + jtag_libusb_set_configuration(h->fd, 0); - if (jtag_libusb_claim_interface(h->fd, 0) != ERROR_OK) { - LOG_DEBUG("claim interface failed"); - goto error_open; - } + if (jtag_libusb_claim_interface(h->fd, 0) != ERROR_OK) { + LOG_DEBUG("claim interface failed"); + goto error_open; + } - /* wrap version for first read */ - switch (param->pid) { + /* wrap version for first read */ + switch (param->pid) { case 0x3744: h->version.stlink = 1; break; default: h->version.stlink = 2; break; - } + } - /* get the device version */ - err = stlink_usb_version(h); + /* get the device version */ + err = stlink_usb_version(h); - if (err != ERROR_OK) { - LOG_ERROR("read version failed"); - goto error_open; - } + if (err == ERROR_OK) { + break; + } else if (h->version.stlink == 1 || + retry_count == 0) { + LOG_ERROR("read version failed"); + goto error_open; + } else { + err = jtag_libusb_release_interface(h->fd, 0); + if (err != ERROR_OK) { + LOG_ERROR("release interface failed"); + goto error_open; + } + + err = jtag_libusb_reset_device(h->fd); + if (err != ERROR_OK) { + LOG_ERROR("reset device failed"); + goto error_open; + } + + jtag_libusb_close(h->fd); + /* + Give the device one second to settle down and + reenumerate. + */ + sleep(1); + retry_count--; + } + } while (1); /* compare usb vid/pid */ if ((param->vid != h->vid) || (param->pid != h->pid)) -- ------------------------------------------------------------------------------ Introducing Performance Central, a new site from SourceForge and AppDynamics. 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