soc/intel/alderlake: Add support to update descriptor at runtime

On nereid, we need to update the descriptor based on fw_config (see
the follow-up patch), so add support to update the descriptor at
runtime. This is a temporary workaround while we find a better solution.

This is basically adding back the configure_pmc_descriptor() function
removed in CB:63339, just making it generic and allowing it to update
multiple bytes at once.

BUG=b:226848617
TEST=With the following patch, Type-C and HDMI work on nereid.

Change-Id: I43c4d2888706561e42ff6b8ce0377eedbc38dbfe
Signed-off-by: Reka Norman <rekanorman@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63365
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: Sam McNally <sammc@google.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/soc/intel/alderlake/include/soc/bootblock.h b/src/soc/intel/alderlake/include/soc/bootblock.h
index ce2e42e6b2..ba4d1c24c0 100644
--- a/src/soc/intel/alderlake/include/soc/bootblock.h
+++ b/src/soc/intel/alderlake/include/soc/bootblock.h
@@ -9,6 +9,11 @@
 #error "Please select exactly one PCH type"
 #endif
 
+struct descriptor_byte {
+	size_t offset;
+	uint8_t desired_value;
+};
+
 /* Bootblock pre console init programming */
 void bootblock_pch_early_init(void);
 
@@ -17,4 +22,6 @@ void bootblock_pch_init(void);
 void pch_early_iorange_init(void);
 void report_platform_info(void);
 
+void configure_descriptor(struct descriptor_byte *bytes, size_t num);
+
 #endif