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g: allow to select the default USB PHY at startup.

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When (USB-)resuming from deep-sleep, ensure that we avoid switching back
and forth the selected USB PHY at boot, in order to avoid having a
short disconnection at resume.
To achieve this, allow the board configuration to select the PHY it is
really using with the CONFIG_USB_SELECT_PHY_DEFAULT configuration
variable, still keep the default USB_SEL_PHY1 as before.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=none
BUG=b:38160821
TEST=manual: build 'proto2' firmware with CONFIG_LOW_POWER_IDLE defined,
with the chip connected to the host on PHY A, make the host issue a USB
Suspend then resume and see no disconnection.

Change-Id: I7abd5e338e5c688c2dd486293f520049cdfd273b
Reviewed-on: https://chromium-review.googlesource.com/501947
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Marius Schilder <mschilder@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
This commit is contained in:
Vincent Palatin
2017-05-10 15:56:10 +02:00
committed by chrome-bot
parent fb6b933def
commit 4ecdf78793
2 changed files with 7 additions and 1 deletions
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6
chip/g/usb.c
View File

@@ -331,8 +331,12 @@ static enum {
} device_state;
static uint8_t configuration_value;
#ifndef CONFIG_USB_SELECT_PHY_DEFAULT
#define CONFIG_USB_SELECT_PHY_DEFAULT USB_SEL_PHY1
#endif
/* Default PHY to use */
static uint32_t which_phy = USB_SEL_PHY1;
static uint32_t which_phy = CONFIG_USB_SELECT_PHY_DEFAULT;
void usb_select_phy(uint32_t phy)
{

2
include/config.h
View File

@@ -2483,6 +2483,8 @@
/* Support control of multiple PHY */
#undef CONFIG_USB_SELECT_PHY
/* Select which USB PHY will be used at startup */
#undef CONFIG_USB_SELECT_PHY_DEFAULT
/* Support simple control of power to the device's USB ports */
#undef CONFIG_USB_PORT_POWER_DUMB