diff options
| author | Furquan Shaikh <furquan@chromium.org> | 2017-08-02 19:06:05 -0700 |
|---|---|---|
| committer | Furquan Shaikh <furquan@google.com> | 2017-08-04 15:25:27 +0000 |
| commit | 0767f89be48475a84339a71059f472a4d31e1d4d (patch) | |
| tree | cfcd909f73e348b3d00b53a6b61a8788d84ecb9f | |
| parent | 5a89b40b15eaf2522b5e08ac2bd69e5b8f9bd54b (diff) | |
mainboard/google/soraka: Configure GPP_B8 in bootblock
GPP_B8 acts as input to the inverter whose output controls PERST#
signal to wifi module. Out of reset, GPP_B8 is configured as
input by default. Since there is no external pull-down on it, this
line is floating and results in PERST# being asserted until ramstage
where the GPIO was originally configured. Because of this the wifi
chip is not ready during the PCIe initialization step. Move the
configuration of GPP_B8 to bootblock so that wifi device is taken out
of reset as early as possible.
BUG=b:64181150,b:62726961
TEST=Verified with warm reboot and suspend-resume stress test that
wifi is still functional.
Change-Id: I68e1bd67499262a17daade72e9a9fd32934a184d
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/20869
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
| -rw-r--r-- | src/mainboard/google/poppy/variants/soraka/gpio.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/mainboard/google/poppy/variants/soraka/gpio.c b/src/mainboard/google/poppy/variants/soraka/gpio.c index f0fb34afaf..6e0a54f24d 100644 --- a/src/mainboard/google/poppy/variants/soraka/gpio.c +++ b/src/mainboard/google/poppy/variants/soraka/gpio.c @@ -78,8 +78,6 @@ static const struct pad_config gpio_table[] = { PAD_CFG_NF(GPP_B6, NONE, DEEP, NF1), /* B7 : SRCCLKREQ2# ==> NC */ PAD_CFG_NC(GPP_B7), - /* B8 : SRCCLKREQ3# ==> WLAN_PE_RST */ - PAD_CFG_GPO(GPP_B8, 0, DEEP), /* B9 : SRCCLKREQ4# ==> NC */ PAD_CFG_NC(GPP_B9), /* B10 : SRCCLKREQ5# ==> NC */ @@ -371,6 +369,9 @@ static const struct pad_config gpio_table[] = { /* Early pad configuration in bootblock */ static const struct pad_config early_gpio_table[] = { + /* B8 : SRCCLKREQ3# ==> WLAN_PE_RST */ + PAD_CFG_GPO(GPP_B8, 0, DEEP), + #if IS_ENABLED(CONFIG_POPPY_USE_SPI_TPM) /* B15 : GSPI0_CS# ==> PCH_SPI_H1_3V3_CS_L */ PAD_CFG_NF(GPP_B15, NONE, DEEP, NF1), |