drivers/wifi: Support Bluetooth Dual Chain Mode

This feature provides ability to provide dual chain setting.

The implementation follows document 559910 Intel Connectivity
Platforms BIOS Guideline revision 9.2 specification.

BUG=b:346600091
TEST=BDCM method is added to the bluetooth companion device and
     return the data supplied by the SAR binary blob

Change-Id: Iebe95815c944d045f4cf686abcd1874a8a45e220
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84943
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>

3 files changed, 53 insertions, 1 deletions

diff --git a/src/drivers/wifi/generic/acpi.c b/src/drivers/wifi/generic/acpi.c
index 4be43ffe43..8bfce816fb 100644
--- a/src/drivers/wifi/generic/acpi.c
+++ b/src/drivers/wifi/generic/acpi.c
@@ -736,6 +736,41 @@ static void sar_emit_bbfb(const struct bbfb_profile *bbfb)
 	acpigen_write_package_end();
 }
 
+static void sar_emit_bdcm(const struct bdcm_profile *bdcm)
+{
+	if (bdcm == NULL)
+		return;
+
+	/*
+	 * Name ("BDCM", Package () {
+	 *   Revision,
+	 *   Package () {
+	 *     Domain Type,			// 0x12:Bluetooth
+	 *     Dual Chain Mode
+	 *   }
+	 * })
+	 */
+	if (bdcm->revision != BDCM_REVISION) {
+		printk(BIOS_ERR, "Unsupported BDCM table revision: %d\n",
+		       bdcm->revision);
+		return;
+	}
+
+	acpigen_write_name("BDCM");
+	acpigen_write_package(2);
+	acpigen_write_dword(bdcm->revision);
+
+	/*
+	 * Emit 'Domain Type' + 'Dual Chain Mode'
+	 */
+	acpigen_write_package(2);
+	acpigen_write_dword(DOMAIN_TYPE_BLUETOOTH);
+	acpigen_write_dword(bdcm->dual_chain_mode);
+
+	acpigen_write_package_end();
+	acpigen_write_package_end();
+}
+
 static void emit_wifi_sar_acpi_structures(const struct device *dev,
 					  union wifi_sar_limits *sar_limits)
 {
@@ -870,6 +905,7 @@ static void wifi_ssdt_write_properties(const struct device *dev, const char *sco
 			sar_emit_brds(sar_limits.bsar);
 			sar_emit_bpag(sar_limits.bpag);
 			sar_emit_bbfb(sar_limits.bbfb);
+			sar_emit_bdcm(sar_limits.bdcm);
 			acpigen_write_scope_end();
 		} else {
 			printk(BIOS_ERR, "Failed to get %s Bluetooth companion ACPI path\n",
diff --git a/src/include/sar.h b/src/include/sar.h
index 0609bd34ef..d09ee0dd03 100644
--- a/src/include/sar.h
+++ b/src/include/sar.h
@@ -9,12 +9,13 @@
 #define MAX_DENYLIST_ENTRY	16
 #define MAX_DSAR_SET_COUNT	3
 #define MAX_GEO_OFFSET_REVISION	3
-#define MAX_PROFILE_COUNT	9
+#define MAX_PROFILE_COUNT	10
 #define MAX_SAR_REVISION	2
 #define BSAR_REVISION		1
 #define WBEM_REVISION		0
 #define BPAG_REVISION		2
 #define BBFB_REVISION		1
+#define BDCM_REVISION		1
 #define REVISION_SIZE		1
 #define SAR_REV0_CHAINS_COUNT	2
 #define SAR_REV0_SUBBANDS_COUNT	5
@@ -93,6 +94,11 @@ struct bbfb_profile {
 	uint8_t enable_quad_filter_bypass;
 } __packed;
 
+struct bdcm_profile {
+	uint8_t revision;
+	uint32_t dual_chain_mode;
+} __packed;
+
 struct sar_header {
 	char marker[SAR_STR_PREFIX_SIZE];
 	uint8_t version;
@@ -111,6 +117,7 @@ union wifi_sar_limits {
 		struct wbem_profile *wbem;
 		struct bpag_profile *bpag;
 		struct bbfb_profile *bbfb;
+		struct bdcm_profile *bdcm;
 	};
 	void *profile[MAX_PROFILE_COUNT];
 };
diff --git a/src/vendorcode/google/chromeos/sar.c b/src/vendorcode/google/chromeos/sar.c
index 8d19f00222..bf2900b019 100644
--- a/src/vendorcode/google/chromeos/sar.c
+++ b/src/vendorcode/google/chromeos/sar.c
@@ -126,6 +126,14 @@ static size_t bbfb_table_size(const struct bbfb_profile *bbfb)
 	return sizeof(struct bbfb_profile);
 }
 
+static size_t bdcm_table_size(const struct bdcm_profile *bdcm)
+{
+	if (bdcm == NULL)
+		return 0;
+
+	return sizeof(struct bdcm_profile);
+}
+
 static bool valid_legacy_length(size_t bin_len)
 {
 	if (bin_len == LEGACY_SAR_WGDS_BIN_SIZE)
@@ -181,6 +189,7 @@ static int fill_wifi_sar_limits(union wifi_sar_limits *sar_limits, const uint8_t
 	expected_sar_bin_size += wbem_table_size(sar_limits->wbem);
 	expected_sar_bin_size += bpag_table_size(sar_limits->bpag);
 	expected_sar_bin_size += bbfb_table_size(sar_limits->bbfb);
+	expected_sar_bin_size += bdcm_table_size(sar_limits->bdcm);
 
 	if (sar_bin_size != expected_sar_bin_size) {
 		printk(BIOS_ERR, "Invalid SAR size, expected: %zu, obtained: %zu\n",