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authorFurquan Shaikh <furquan@chromium.org>2017-08-02 19:06:05 -0700
committerFurquan Shaikh <furquan@google.com>2017-08-04 15:25:27 +0000
commit0767f89be48475a84339a71059f472a4d31e1d4d (patch)
treecfcd909f73e348b3d00b53a6b61a8788d84ecb9f /src/mainboard
parent5a89b40b15eaf2522b5e08ac2bd69e5b8f9bd54b (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>
Diffstat (limited to 'src/mainboard')
-rw-r--r--src/mainboard/google/poppy/variants/soraka/gpio.c5
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),