diff options
| -rw-r--r-- | power/skylake.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/power/skylake.c b/power/skylake.c index 515c77697e..7ae1a3cc43 100644 --- a/power/skylake.c +++ b/power/skylake.c @@ -118,7 +118,23 @@ enum power_state power_chipset_init(void) enum power_state power_handle_state(enum power_state state) { - gpio_set_level(GPIO_PCH_RSMRST_L, gpio_get_level(GPIO_RSMRST_L_PGOOD)); + /* + * Pass through RSMRST asynchronously, as PCH may not react + * immediately to power changes. + */ + int rsmrst_in = gpio_get_level(GPIO_RSMRST_L_PGOOD); + int rsmrst_out = gpio_get_level(GPIO_PCH_RSMRST_L); + + if (rsmrst_in != rsmrst_out) { + /* + * Wait at least 10ms between power signals going high + * and deasserting RSMRST to PCH. + */ + if (rsmrst_in) + msleep(10); + gpio_set_level(GPIO_PCH_RSMRST_L, rsmrst_in); + CPRINTS("RSMRST: %d", rsmrst_in); + } switch (state) { case POWER_G3: |