mb/google/rex/var/karis: Enable audio BT offload

BUG=b:312099281
TEST=Build and boot to Karis. Verify the config from serial logs.

w/o this CL -
```
[SPEW ]  ------------------ CNVi Config ------------------
[SPEW ]  CNVi Mode        = 1
[SPEW ]  Wi-Fi Core       = 1
[SPEW ]  BT Core          = 1
[SPEW ]  BT Audio Offload = 0
[SPEW ]  BT Interface     = 1
```

w/ this CL -
```
[SPEW ]  ------------------ CNVi Config ------------------
[SPEW ]  CNVi Mode        = 1
[SPEW ]  Wi-Fi Core       = 1
[SPEW ]  BT Core          = 1
[SPEW ]  BT Audio Offload = 1
[SPEW ]  BT Interface     = 1
```

Change-Id: Icd2c42261fdcfa5aac17be28fde3804348ddf9b4
Signed-off-by: Tyler Wang <tyler.wang@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79210
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>

2 files changed, 56 insertions, 0 deletions

diff --git a/src/mainboard/google/rex/variants/karis/fw_config.c b/src/mainboard/google/rex/variants/karis/fw_config.c
index ea9f9ebd18..ae74a42fa4 100644
--- a/src/mainboard/google/rex/variants/karis/fw_config.c
+++ b/src/mainboard/google/rex/variants/karis/fw_config.c
@@ -34,6 +34,43 @@ static const struct pad_config stylus_disable_pads[] = {
 	PAD_NC(GPP_E09, NONE),
 };
 
+static const struct pad_config cnvi_bt_disable_pads[] = {
+	/* GPP_F04 : [] ==> CNV_RF_RST_L */
+	PAD_NC(GPP_F04, NONE),
+	/* GPP_F05 : [] ==> CNV_CLKREQ */
+	PAD_NC(GPP_F05, NONE),
+};
+
+static const struct pad_config bt_i2s_enable_pads[] = {
+	/* GPP_V30 : [] ==> BT_I2S_BCLK */
+	PAD_CFG_NF(GPP_VGPIO30, NONE, DEEP, NF2),
+	/* GPP_V31 : [] ==> BT_I2S_SYNC */
+	PAD_CFG_NF(GPP_VGPIO31, NONE, DEEP, NF2),
+	/* GPP_V32 : [] ==> BT_I2S_SDO */
+	PAD_CFG_NF(GPP_VGPIO32, NONE, DEEP, NF2),
+	/* GPP_V33 : [] ==> BT_I2S_SDI */
+	PAD_CFG_NF(GPP_VGPIO33, NONE, DEEP, NF2),
+	/* GPP_V34 : [] ==> SSP2_SCLK */
+	PAD_CFG_NF(GPP_VGPIO34, NONE, DEEP, NF1),
+	/* GPP_V35 : [] ==> SSP2_SFRM */
+	PAD_CFG_NF(GPP_VGPIO35, NONE, DEEP, NF1),
+	/* GPP_V36 : [] ==> SSP_TXD */
+	PAD_CFG_NF(GPP_VGPIO36, NONE, DEEP, NF1),
+	/* GPP_V37 : [] ==> SSP_RXD */
+	PAD_CFG_NF(GPP_VGPIO37, NONE, DEEP, NF1),
+};
+
+static const struct pad_config discrete_bt_i2s_enable_pads[] = {
+	/* GPP_S00 : [] ==> I2S1_SCLK */
+	PAD_CFG_NF(GPP_S00, NONE, DEEP, NF6),
+	/* GPP_S01 : [] ==> I2S1_SFRM */
+	PAD_CFG_NF(GPP_S01, NONE, DEEP, NF6),
+	/* GPP_S02 : [] ==> I2S1_TXD */
+	PAD_CFG_NF(GPP_S02, NONE, DEEP, NF6),
+	/* GPP_S03 : [] ==> I2S1_RXD */
+	PAD_CFG_NF(GPP_S03, NONE, DEEP, NF6),
+};
+
 void fw_config_gpio_padbased_override(struct pad_config *padbased_table)
 {
 	if (fw_config_probe(FW_CONFIG(STYLUS, STYLUS_ABSENT))) {
@@ -44,4 +81,18 @@ void fw_config_gpio_padbased_override(struct pad_config *padbased_table)
 		printk(BIOS_INFO, "Configure GPIOs for no FP module.\n");
 		GPIO_PADBASED_OVERRIDE(padbased_table, fp_disable_pads);
 	}
+	if (fw_config_probe(FW_CONFIG(AUDIO, ALC5650_NO_AMP_I2S))) {
+		printk(BIOS_INFO, "Configure GPIOs for BT offload mode.\n");
+		GPIO_PADBASED_OVERRIDE(padbased_table, bt_i2s_enable_pads);
+	}
+	if (fw_config_probe(FW_CONFIG(WIFI_TYPE, WIFI_CNVI))) {
+		printk(BIOS_INFO, "Configure GPIOs for CNVi WIFI/BT module.\n");
+		GPIO_PADBASED_OVERRIDE(padbased_table, bt_i2s_enable_pads);
+	}
+	if (fw_config_probe(FW_CONFIG(WIFI_TYPE, WIFI_PCIE))) {
+		printk(BIOS_INFO, "Configure GPIOs for discrete WIFI/BT module.\n");
+		GPIO_PADBASED_OVERRIDE(padbased_table, discrete_bt_i2s_enable_pads);
+		printk(BIOS_INFO, "Configure GPIOs for discrete PCM BT path.\n");
+		GPIO_PADBASED_OVERRIDE(padbased_table, cnvi_bt_disable_pads);
+	}
 }
diff --git a/src/mainboard/google/rex/variants/karis/variant.c b/src/mainboard/google/rex/variants/karis/variant.c
index 308eea6a28..85a908a846 100644
--- a/src/mainboard/google/rex/variants/karis/variant.c
+++ b/src/mainboard/google/rex/variants/karis/variant.c
@@ -9,3 +9,8 @@ const char *get_wifi_sar_cbfs_filename(void)
 {
 	return get_wifi_sar_fw_config_filename(FW_CONFIG_FIELD(WIFI_TYPE));
 }
+
+void variant_update_soc_chip_config(struct soc_intel_meteorlake_config *config)
+{
+	config->cnvi_bt_audio_offload = true;
+}