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tcpc: use initialization complete alert bit to signal readiness

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Use the new TCPC initialization complete bit in alert register to
signal TCPC readiness instead of checking for USB VID to be set.

BUG=none
BRANCH=none
TEST=load on glados, make sure we can boot without battery.

Change-Id: I4b25c973ece0de6dd3f419c5901cff1d8d05ed95
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/282593
Reviewed-by: Scott Collyer <scollyer@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Alec Berg
2015-06-29 15:51:33 -07:00
committed by ChromeOS Commit Bot
parent dd9e4fa427
commit a11ffa6c93
2 changed files with 19 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
common/usb_pd_tcpc.c
View File

@@ -41,9 +41,6 @@ static struct mutex pd_crc_lock;
static const int debug_level;
#endif
/* USB Vendor ID, initialized to 0, written to actual VID when TCPC is ready */
static int tcpc_vid;
/* Encode 5 bits using Biphase Mark Coding */
#define BMC(x) ((x & 1 ? 0x001 : 0x3FF) \
^ (x & 2 ? 0x004 : 0x3FC) \
@@ -712,6 +709,8 @@ static void alert(int port, int mask)
void tcpc_init(int port)
{
int i;
/* Initialize physical layer */
pd_hw_init(port, PD_ROLE_DEFAULT);
pd[port].cc_pull = PD_ROLE_DEFAULT == PD_ROLE_SOURCE ? TYPEC_CC_RP :
@@ -719,6 +718,12 @@ void tcpc_init(int port)
/* make sure PD monitoring is disabled initially */
pd[port].rx_enabled = 0;
/* make initial readings of CC voltages */
for (i = 0; i < 2; i++) {
pd[port].cc_status[i] = cc_voltage_to_status(port,
pd_adc_read(port, i));
}
}
int tcpc_run(int port, int evt)
@@ -791,9 +796,6 @@ int tcpc_run(int port, int evt)
if (pd[port].rx_enabled)
pd_rx_enable_monitoring(port);
/* write our TCPC VID to notify TCPM that we are ready */
tcpc_vid = USB_VID_GOOGLE;
/* TODO: adjust timeout based on how often to sample CC */
return 10*MSEC;
}
@@ -808,6 +810,9 @@ void pd_task(void)
/* initialize phy task */
tcpc_init(port);
/* we are now initialized */
alert(port, TCPC_REG_ALERT_TCPC_INITED);
while (1) {
/* wait for next event/packet or timeout expiration */
evt = task_wait_event(timeout);
@@ -998,7 +1003,7 @@ static int tcpc_i2c_read(int port, int reg, uint8_t *payload)
switch (reg) {
case TCPC_REG_VENDOR_ID:
*(uint16_t *)payload = tcpc_vid;
*(uint16_t *)payload = USB_VID_GOOGLE;
return 2;
case TCPC_REG_CC_STATUS:
tcpc_get_cc(port, &cc1, &cc2);

10
driver/tcpm/tcpci.c
View File

@@ -39,17 +39,21 @@ static int init_alert_mask(int port)
int tcpm_init(int port)
{
int rv, vid = 0;
int rv, alert = 0;
while (1) {
rv = i2c_read16(I2C_PORT_TCPC, I2C_ADDR_TCPC(port),
TCPC_REG_VENDOR_ID, &vid);
TCPC_REG_ALERT, &alert);
/*
* If i2c succeeds and VID is non-zero, then initialization
* is complete
*/
if (rv == EC_SUCCESS && vid)
if (rv == EC_SUCCESS && (alert & TCPC_REG_ALERT_TCPC_INITED)) {
/* clear all alert bits */
i2c_write16(I2C_PORT_TCPC, I2C_ADDR_TCPC(port),
TCPC_REG_ALERT, 0xff);
return init_alert_mask(port);
}
msleep(10);
}
}