diff options
Diffstat (limited to 'driver/retimer/bb_retimer.c')
| -rw-r--r-- | driver/retimer/bb_retimer.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/driver/retimer/bb_retimer.c b/driver/retimer/bb_retimer.c index 8855f049b1..b815bf1de4 100644 --- a/driver/retimer/bb_retimer.c +++ b/driver/retimer/bb_retimer.c @@ -6,6 +6,7 @@ */ #include "bb_retimer.h" +#include "chipset.h" #include "common.h" #include "console.h" #include "i2c.h" @@ -95,6 +96,12 @@ static void bb_retimer_power_handle(const struct usb_mux *me, int on_off) if (on_off) { gpio_set_level(control->usb_ls_en_gpio, 1); + /* + * Tpw, minimum time from VCC to RESET_N de-assertion is 100us. + * For boards that don't provide a load switch control, the + * retimer_init() function ensures power is up before calling + * this function. + */ msleep(1); gpio_set_level(control->retimer_rst_gpio, 1); msleep(10); @@ -417,6 +424,13 @@ static int retimer_init(const struct usb_mux *me) int rv; uint32_t data; + /* Burnside Bridge is powered by main AP rail */ + if (chipset_in_or_transitioning_to_state(CHIPSET_STATE_ANY_OFF)) { + /* Ensure reset is asserted while chip is not powered */ + bb_retimer_power_handle(me, 0); + return EC_ERROR_NOT_POWERED; + } + bb_retimer_power_handle(me, 1); rv = bb_retimer_read(me, BB_RETIMER_REG_VENDOR_ID, &data); |