[PATCH v2 2/7] drm: ci: Force db410c to host mode

[Vignesh Raman]

Force db410c to host mode to fix network issue which results in failure
to mount root fs via NFS.
See https://gitlab.freedesktop.org/gfx-ci/linux/-/commit/cb72a629b8c15c80a54dda510743cefd1c4b65b8

Use fdtoverlay command to merge base device tree with an overlay
which contains the fix for USB controllers to work in host mode.

Signed-off-by: Vignesh Raman <vignesh.raman at collabora.com>
---

v2:
  - Use fdtoverlay command to merge overlay dtbo with the base dtb instead of modifying the kernel sources
  
---
 drivers/gpu/drm/ci/build.sh                         |  5 +++++
 .../gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts  | 13 +++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts

diff --git a/drivers/gpu/drm/ci/build.sh b/drivers/gpu/drm/ci/build.sh
index 7b014287a041..92ffd98cd09e 100644
--- a/drivers/gpu/drm/ci/build.sh
+++ b/drivers/gpu/drm/ci/build.sh
@@ -92,6 +92,11 @@ done
 
 if [[ -n ${DEVICE_TREES} ]]; then
     make dtbs
+    if [[ -e arch/arm64/boot/dts/qcom/apq8016-sbc.dtb ]]; then
+        dtc -@ -I dts -O dtb -o drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dtbo drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts
+        fdtoverlay -i arch/arm64/boot/dts/qcom/apq8016-sbc.dtb -o arch/arm64/boot/dts/qcom/apq8016-sbc-overlay.dtb drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dtbo
+        mv arch/arm64/boot/dts/qcom/apq8016-sbc-overlay.dtb arch/arm64/boot/dts/qcom/apq8016-sbc.dtb
+    fi
     cp ${DEVICE_TREES} /lava-files/.
 fi
 
diff --git a/drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts b/drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts
new file mode 100644
index 000000000000..57b7604f1c23
--- /dev/null
+++ b/drivers/gpu/drm/ci/dt-overlays/apq8016-sbc-overlay.dts
@@ -0,0 +1,13 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+    fragment at 0 {
+        target-path = "/soc at 0";
+        __overlay__ {
+            usb at 78d9000 {
+                dr_mode = "host";
+            };
+        };
+    };
+};
-- 
2.40.1