[S] Change in coreboot[main]: soc/intel/cse: Add API to check if CSE Firmware update is required

[Anil Kumar K (Code Review)]

Anil Kumar K has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/78243?usp=email )

Change subject: soc/intel/cse: Add API to check if CSE Firmware update is required
......................................................................

soc/intel/cse: Add API to check if CSE Firmware update is required

This patch adds a function to check if a CSE FW update is required during this
boot. The function is expected to be used during use cases like Pre-Memory
Sign of Life text display to inform user of a CSE Firmware update .

Bug=279173035
TEST=build and boot on google/rex board. Call the function in romstage and confirm
it returns True during CSE FW update and False otherwise

Signed-off-by: Anil Kumar 
Change-Id: If5fae95786d28d586566881bc4436812754636ae
---
M src/soc/intel/common/block/cse/cse_lite.c
M src/soc/intel/common/block/include/intelblocks/cse.h
2 files changed, 35 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/43/78243/1

diff --git a/src/soc/intel/common/block/cse/cse_lite.c b/src/soc/intel/common/block/cse/cse_lite.c
index bd06bbf..f03b1c6 100644
--- a/src/soc/intel/common/block/cse/cse_lite.c
+++ b/src/soc/intel/common/block/cse/cse_lite.c
@@ -1177,6 +1177,36 @@
    backup_psr_data();
 }

+/*
+ * Check if a CSE Firmware update is required
+ * returns true if an update is required, false otherwise
+ */
+bool is_cse_fw_update_required(void)
+{
+        struct fw_version cbfs_rw_version;
+        int ret;
+
+        if (!is_cse_fw_update_enabled())
+                return false;
+
+        /*
+         * First check if cse_bp_info_rsp global structure is populated
+         * else, this implies that cse_fill_bp_info() function is not called
+         */
+        if (!is_cse_bp_info_valid(&cse_bp_info_rsp))
+                return false;
+
+        if (get_cse_ver_from_cbfs(&cbfs_rw_version) == CB_ERR)
+                return false;
+
+        ret = cse_compare_sub_part_version(&cbfs_rw_version, cse_get_rw_version());
+        if (ret == 0)
+		/* return false if CSE FW update is not required */
+		return false;
+        else
+		return true;
+}
+
 static uint8_t cse_fw_update(void)
 {
    struct region_device target_rdev;
diff --git a/src/soc/intel/common/block/include/intelblocks/cse.h b/src/soc/intel/common/block/include/intelblocks/cse.h
index f84dba8..3db1324 100644
--- a/src/soc/intel/common/block/include/intelblocks/cse.h
+++ b/src/soc/intel/common/block/include/intelblocks/cse.h
@@ -611,4 +611,9 @@
 /* Fills the CSE Boot Partition Info response */
 void cse_fill_bp_info(void);

+/*
+ * Check if a CSE Firmware update is required
+ * Returns true if an update is required, false otherwise
+ */
+bool is_cse_fw_update_required(void);
 #endif // SOC_INTEL_COMMON_CSE_H