Merge "libhwc2.1: allow EDID descriptor to be modified" into udc-dev

2 files changed, 11 insertions, 1 deletions

diff --git a/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.cpp b/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.cpp
index 7f565e4..6a2be7d 100644
--- a/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.cpp
+++ b/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.cpp
@@ -431,7 +431,8 @@ int32_t ExynosDisplayDrmInterface::getDefaultModeId(int32_t *modeId) {
     return NO_ERROR;
 }
 
-ExynosDisplayDrmInterface::ExynosDisplayDrmInterface(ExynosDisplay *exynosDisplay)
+ExynosDisplayDrmInterface::ExynosDisplayDrmInterface(ExynosDisplay *exynosDisplay):
+    mMonitorDescription{0}
 {
     mType = INTERFACE_TYPE_DRM;
     init(exynosDisplay);
@@ -2423,6 +2424,11 @@ int32_t ExynosDisplayDrmInterface::getDisplayFakeEdid(uint8_t &outPort, uint32_t
     edid_buf[59] = height & 0xff;
     edid_buf[61] = (height >> 4) & 0xf0;
 
+    if (mMonitorDescription[0] != 0) {
+        /* Descriptor block 3 starts at address 90, data offset is 5 bytes */
+        memcpy(&edid_buf[95], mMonitorDescription.data(), mMonitorDescription.size());
+    }
+
     unsigned int sum = std::accumulate(edid_buf.begin(), edid_buf.end() - 1, 0);
     edid_buf[127] = (0x100 - (sum & 0xFF)) & 0xFF;
     if (outData) {
diff --git a/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.h b/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.h
index d3e9e66..bf5c9aa 100644
--- a/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.h
+++ b/libhwc2.1/libdisplayinterface/ExynosDisplayDrmInterface.h
@@ -37,6 +37,9 @@
 /* Max plane number of buffer object */
 #define HWC_DRM_BO_MAX_PLANES 4
 
+/* Monitor Descriptor data is 13 bytes in VESA EDID Standard */
+#define MONITOR_DESCRIPTOR_DATA_LENGTH 13
+
 #ifndef HWC_FORCE_PANIC_PATH
 #define HWC_FORCE_PANIC_PATH "/d/dpu/panic"
 #endif
@@ -492,6 +495,7 @@ class ExynosDisplayDrmInterface :
 
         DrmReadbackInfo mReadbackInfo;
         FramebufferManager mFBManager;
+        std::array<uint8_t, MONITOR_DESCRIPTOR_DATA_LENGTH> mMonitorDescription;
 
     private:
         int32_t getDisplayFakeEdid(uint8_t &outPort, uint32_t &outDataSize, uint8_t *outData);