Change in coreboot[master]: mb/google/guybrush/dewatt: Add variant to disable HDMI

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/61260 )

Change subject: mb/google/guybrush/dewatt: Add variant to disable HDMI
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mb/google/guybrush/dewatt: Add variant to disable HDMI

For one specific type of APU, it doesn't have HDMI. When we detect
this APU, we need to explicitly disable HDMI in DDI settings,
otherwise the system would freeze.

get_cpu_count() == 4 && get_threads_per_core() == 2: This case is for
2 Core and 4 Thread CPU (2C/4T for short).
get_cpu_count() == 2: This is for 2C/2T. This is for a possible future case.

BUG=b:208677293

Change-Id: I8d0fa96818a768b7960d92821b927dbc622675ae
Signed-off-by: Zheng Bao 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61260
Tested-by: build bot (Jenkins) 
Reviewed-by: Felix Held 
Reviewed-by: Chris Wang 
---
M src/mainboard/google/guybrush/variants/dewatt/Makefile.inc
A src/mainboard/google/guybrush/variants/dewatt/variant.c
2 files changed, 12 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Felix Held: Looks good to me, approved
  Chris Wang: Looks good to me, but someone else must approve

diff --git a/src/mainboard/google/guybrush/variants/dewatt/Makefile.inc b/src/mainboard/google/guybrush/variants/dewatt/Makefile.inc
index becdf6a..823860b 100644
--- a/src/mainboard/google/guybrush/variants/dewatt/Makefile.inc
+++ b/src/mainboard/google/guybrush/variants/dewatt/Makefile.inc
@@ -6,3 +6,5 @@
 verstage-y += gpio.c

subdirs-y += ./memory
+
+romstage-y += variant.c
diff --git a/src/mainboard/google/guybrush/variants/dewatt/variant.c b/src/mainboard/google/guybrush/variants/dewatt/variant.c
new file mode 100644
index 0000000..a985b05
--- /dev/null
+++ b/src/mainboard/google/guybrush/variants/dewatt/variant.c
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <baseboard/variants.h>
+#include <amdblocks/cpu.h>
+
+void variant_update_ddi_descriptors(fsp_ddi_descriptor *ddi_descriptors)
+{
+	if ((get_cpu_count() == 4 && get_threads_per_core() == 2) || get_cpu_count() == 2)
+		ddi_descriptors[1].connector_type = DDI_UNUSED_TYPE;
+}