scottk/OpenCellular
1
0
Fork 0
mirror of https://github.com/Telecominfraproject/OpenCellular.git synced 2025-12-30 10:31:02 +00:00
Code Issues Packages Projects Releases Wiki Activity

Plankton: reset USB hub on POR

Browse Source 
On power-on reset, the USB hub might get stuck in a locked state due to
a race condition in hardware. Let's reset the hub after 0.5 seconds to
make sure this doesn't happen.

BUG=chrome-os-partner:32163
TEST=Power on the board. Measure the reset signal.
BRANCH=None

Change-Id: I0f89883c5db7c5376f3612da1615ba4f86b5efa6
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/219199
Reviewed-by: Alec Berg <alecaberg@chromium.org>
This commit is contained in:
Vic Yang
2014-09-22 17:19:42 +08:00
committed by chrome-internal-fetch
parent cc0843d270
commit 4fda01ca91
1 changed files with 20 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
board/plankton/board.c
View File

@@ -13,6 +13,7 @@
#include "i2c.h"
#include "ioexpander_pca9534.h"
#include "registers.h"
#include "system.h"
#include "task.h"
#include "timer.h"
#include "usb_pd.h"
@@ -200,7 +201,7 @@ DECLARE_CONSOLE_COMMAND(usbc_action, cmd_usbc_action,
"Set Plankton type-C port state",
NULL);
static int cmd_usb_hub_reset(int argc, char *argv[])
static int board_usb_hub_reset(void)
{
int ret;
@@ -213,5 +214,23 @@ static int cmd_usb_hub_reset(int argc, char *argv[])
usleep(100 * MSEC);
return pca9534_set_level(I2C_PORT_MASTER, 0x40, 7, 1);
}
static int cmd_usb_hub_reset(int argc, char *argv[])
{
return board_usb_hub_reset();
}
DECLARE_CONSOLE_COMMAND(hub_reset, cmd_usb_hub_reset,
NULL, "Reset USB hub", NULL);
static void board_usb_hub_reset_no_return(void)
{
board_usb_hub_reset();
}
DECLARE_DEFERRED(board_usb_hub_reset_no_return);
static void board_init_usb_hub(void)
{
if (system_get_reset_flags() & RESET_FLAG_POWER_ON)
hook_call_deferred(board_usb_hub_reset_no_return, 500 * MSEC);
}
DECLARE_HOOK(HOOK_INIT, board_init_usb_hub, HOOK_PRIO_DEFAULT);