mb/google/brya: Enable BT offload conditionally

Currently, BT offload is disabled/enabled unconditionally based on the
devicetree settings. BT offload uses I2S lines and cannot be enabled
when a I2S based audio daughter card is active. So we need to enable
BT offload only while using soundwire based audio daugther card.

BUG=b:175701262
TEST=Verified BT offload on brya with soundwire audio daughter card
BT offload enabled

Change-Id: I6a9ad463e13e2cfcfc3b7de5a61a25cdef0641f7
Signed-off-by: Sugnan Prabhu S <sugnan.prabhu.s@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55180
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

3 files changed, 39 insertions, 0 deletions

diff --git a/src/mainboard/google/brya/variants/brya0/Makefile.inc b/src/mainboard/google/brya/variants/brya0/Makefile.inc
index adb03e22e1..cd8eb69611 100644
--- a/src/mainboard/google/brya/variants/brya0/Makefile.inc
+++ b/src/mainboard/google/brya/variants/brya0/Makefile.inc
@@ -1,3 +1,4 @@
 bootblock-y += gpio.c
 ramstage-$(CONFIG_FW_CONFIG) += fw_config.c
+ramstage-$(CONFIG_FW_CONFIG) += variant.c
 ramstage-y += gpio.c
diff --git a/src/mainboard/google/brya/variants/brya0/fw_config.c b/src/mainboard/google/brya/variants/brya0/fw_config.c
index 66539afa37..11cd684c2e 100644
--- a/src/mainboard/google/brya/variants/brya0/fw_config.c
+++ b/src/mainboard/google/brya/variants/brya0/fw_config.c
@@ -55,6 +55,28 @@ static const struct pad_config i2s_disable_pads[] = {
 	PAD_NC(GPP_R7, NONE),
 };
 
+static const struct pad_config bt_i2s_enable_pads[] = {
+	PAD_CFG_NF(GPP_VGPIO_30, NONE, DEEP, NF3),	/* BT_I2S_BCLK */
+	PAD_CFG_NF(GPP_VGPIO_31, NONE, DEEP, NF3),	/* BT_I2S_SYNC */
+	PAD_CFG_NF(GPP_VGPIO_32, NONE, DEEP, NF3),	/* BT_I2S_SDO */
+	PAD_CFG_NF(GPP_VGPIO_33, NONE, DEEP, NF3),	/* BT_I2S_SDI */
+	PAD_CFG_NF(GPP_VGPIO_34, NONE, DEEP, NF1),	/* SSP2_SCLK */
+	PAD_CFG_NF(GPP_VGPIO_35, NONE, DEEP, NF1),	/* SSP2_SFRM */
+	PAD_CFG_NF(GPP_VGPIO_36, NONE, DEEP, NF1),	/* SSP_TXD */
+	PAD_CFG_NF(GPP_VGPIO_37, NONE, DEEP, NF1),	/* SSP_RXD */
+};
+
+static const struct pad_config bt_i2s_disable_pads[] = {
+	PAD_NC(GPP_VGPIO_30, NONE),
+	PAD_NC(GPP_VGPIO_31, NONE),
+	PAD_NC(GPP_VGPIO_32, NONE),
+	PAD_NC(GPP_VGPIO_33, NONE),
+	PAD_NC(GPP_VGPIO_34, NONE),
+	PAD_NC(GPP_VGPIO_35, NONE),
+	PAD_NC(GPP_VGPIO_36, NONE),
+	PAD_NC(GPP_VGPIO_37, NONE),
+};
+
 static void fw_config_handle(void *unused)
 {
 	if (!fw_config_is_provisioned() || fw_config_probe(FW_CONFIG(AUDIO, AUDIO_UNKNOWN))) {
@@ -69,7 +91,13 @@ static void fw_config_handle(void *unused)
 		printk(BIOS_INFO, "Configure audio over SoundWire with MAX98373 ALC5682.\n");
 		gpio_configure_pads(dmic_enable_pads, ARRAY_SIZE(dmic_enable_pads));
 		gpio_configure_pads(sndw_enable_pads, ARRAY_SIZE(sndw_enable_pads));
+		printk(BIOS_INFO, "BT offload enabled\n");
+		gpio_configure_pads(i2s_enable_pads, ARRAY_SIZE(i2s_enable_pads));
+		gpio_configure_pads(bt_i2s_enable_pads, ARRAY_SIZE(bt_i2s_enable_pads));
+	} else {
+		printk(BIOS_INFO, "BT offload disabled\n");
 		gpio_configure_pads(i2s_disable_pads, ARRAY_SIZE(i2s_disable_pads));
+		gpio_configure_pads(bt_i2s_disable_pads, ARRAY_SIZE(bt_i2s_disable_pads));
 	}
 
 	if (fw_config_probe(FW_CONFIG(AUDIO, MAX98357_ALC5682I_I2S))) {
diff --git a/src/mainboard/google/brya/variants/brya0/variant.c b/src/mainboard/google/brya/variants/brya0/variant.c
new file mode 100644
index 0000000000..8d4471ba2e
--- /dev/null
+++ b/src/mainboard/google/brya/variants/brya0/variant.c
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <chip.h>
+#include <fw_config.h>
+#include <baseboard/variants.h>
+
+void variant_update_soc_chip_config(struct soc_intel_alderlake_config *config)
+{
+	config->CnviBtAudioOffload = fw_config_probe(FW_CONFIG(AUDIO, MAX98373_ALC5682_SNDW));
+}