diff options
| author | Shawn Nematbakhsh <shawnn@chromium.org> | 2013-09-12 18:09:39 -0700 |
|---|---|---|
| committer | Isaac Christensen <isaac.christensen@se-eng.com> | 2014-08-14 21:16:59 +0200 |
| commit | 7ecc912b32f3fa1f94c1aadaba275ddb3d5efac5 (patch) | |
| tree | 4724209875557bd64398a18d0be32ac29ee451a8 /payloads/libpayload/drivers/usb | |
| parent | 6ada053709f24675bda1b3598e86426a712d63f9 (diff) | |
libpayload: Increase accuracy of timeout period for media init.
When bringing up media, we claim to wait for up to 30 seconds for a
device to respond to our TEST_UNIT_READY command. Actually, we can wait
far longer because we do not take into account execution delay.
To improve timeout accuracy, make use of gettimeofday(), which calculates
time based upon a CPU counter. This improves the user experience
slightly when certain non-working USB devices are used.
Change-Id: Id9605ecfc0a522d7a0b039fd8eac541232605082
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/169208
Reviewed-by: Julius Werner <jwerner@chromium.org>
(cherry picked from commit 1d3d535db83ff478c512e37f37015b43927b3efc)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6646
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'payloads/libpayload/drivers/usb')
| -rw-r--r-- | payloads/libpayload/drivers/usb/usbmsc.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/payloads/libpayload/drivers/usb/usbmsc.c b/payloads/libpayload/drivers/usb/usbmsc.c index 0259b8d36a..f68bee5bd3 100644 --- a/payloads/libpayload/drivers/usb/usbmsc.c +++ b/payloads/libpayload/drivers/usb/usbmsc.c @@ -537,22 +537,26 @@ static void usb_msc_test_unit_ready (usbdev_t *dev) { int i; + time_t start_time_secs; + struct timeval tv; /* SCSI/ATA specs say we have to wait up to 30s. Ugh */ - const int timeout = 30 * 10; + const int timeout_secs = 30; usb_debug (" Waiting for device to become ready..."); /* Initially mark the device ready. */ usb_msc_mark_ready (dev); + gettimeofday (&tv, NULL); + start_time_secs = tv.tv_sec; - for (i = 0; i < timeout; i++) { + while (tv.tv_sec - start_time_secs < timeout_secs) { switch (test_unit_ready (dev)) { case MSC_COMMAND_OK: break; case MSC_COMMAND_FAIL: mdelay (100); - if (!(timeout % 10)) - usb_debug ("."); + usb_debug ("."); + gettimeofday (&tv, NULL); continue; default: usb_debug ("detached. Device not ready.\n"); @@ -561,7 +565,7 @@ usb_msc_test_unit_ready (usbdev_t *dev) } break; } - if (i >= timeout) { + if (!(tv.tv_sec - start_time_secs < timeout_secs)) { usb_debug ("timeout. Device not ready.\n"); usb_msc_mark_not_ready (dev); } |