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servo_v4: disable USB3 interface

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This change switches the SS lines off in the main USB mux.
There has been some general flakyness regarding USB3 peripherals
and this change might address it.

BUG=chromium:718075
BRANCH=None
TEST=lsusb -t indicates 5000M before, 480M after.

Change-Id: Id201fb20dc6489c4a071cb1c9c0624d7aa54652d
Reviewed-on: https://chromium-review.googlesource.com/509130
Commit-Ready: Nick Sanders <nsanders@chromium.org>
Tested-by: Nick Sanders <nsanders@chromium.org>
Reviewed-by: Shawn N <shawnn@chromium.org>
This commit is contained in:
Nick Sanders
2017-05-18 17:12:26 -07:00
committed by chrome-bot
parent 20f85990c4
commit 80ef3f073e
1 changed files with 5 additions and 2 deletions
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7
board/servo_v4/board.c
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@@ -424,8 +424,11 @@ static void board_init(void)
usleep(1000);
gpio_set_flags(GPIO_DUT_HUB_USB_RESET_L, GPIO_OUT_HIGH);
/* Write USB3 Mode Enable to PS8742 USB/DP Mux. */
i2c_write8(1, 0x20, 0x0, 0x20);
/*
* Write USB3 Mode to PS8742 USB/DP Mux.
* 0x0:disable 0x20:enable.
*/
i2c_write8(1, 0x20, 0x0, 0x0);
/* Enable uservo USB by default. */
init_ioexpander();