Example: Use custom EDID blob for display

Silicon/NVIDIA/Drivers/NvDisplayControllerDxe/NvDisplayControllerDxe.c

@@ -27,6 +27,7 @@
 
 #include <Protocol/ClockNodeProtocol.h>
 #include <Protocol/DevicePath.h>
+#include <Protocol/EdidOverride.h>
 #include <Protocol/EmbeddedGpio.h>
 #include <Protocol/KernelCmdLineUpdate.h>
 
@@ -1247,6 +1248,76 @@ DisplayStart (
   return Status;
 }
 
+/**
+   Retrieves an EDID override for a given controller child handle.
+
+   The current implementation simply returns a single fixed EDID with
+   no respect to what child handle is passed in.
+
+   @param[in]  This        Instance of the installed EFI_EDID_OVERRIDE_PROTOCOL.
+   @param[in]  ChildHandle Child controller handle to retrieve EDID for.
+   @param[out] Attributes  Additional attributes of the EDID override.
+   @param[out] EdidSize    Size of the overriding EDID.
+   @param[out] Edid        Pointer to the overriding EDID.
+
+   @retval EFI_SUCCESS           Overriding EDID returned successfully.
+   @retval EFI_INVALID_PARAMETER One or more parameters are invalid (NULL).
+   @retval EFI_OUT_OF_RESOURCES  Not enough memory available.
+*/
+STATIC
+EFI_STATUS
+EFIAPI
+EfiEdidOverrideProtocolGetEdid (
+  IN  EFI_EDID_OVERRIDE_PROTOCOL *CONST  This,
+  IN  EFI_HANDLE                 *CONST  ChildHandle,
+  OUT UINT32                     *CONST  Attributes,
+  OUT UINTN                      *CONST  EdidSize,
+  OUT UINT8                     **CONST  Edid
+  )
+{
+  /* VESA Enhanced EDID Standard, Release A, Rev.2; Appendix A, Example 2. */
+  STATIC CONST UINT8  EdidBuffer[] = {
+    0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x04, 0x43, 0x07, 0xF2, 0x01, 0x00, 0x00, 0x00,
+    0xFF, 0x11, 0x01, 0x04, 0xA2, 0x4F, 0x00, 0x78, 0x1E, 0xEE, 0x91, 0xA3, 0x54, 0x4C, 0x99, 0x26,
+    0x0F, 0x50, 0x54, 0x20, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+    0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3A, 0x80, 0x18, 0x71, 0x38, 0x2D, 0x40, 0x58, 0x2C,
+    0x04, 0x05, 0x0F, 0x48, 0x42, 0x00, 0x00, 0x1E, 0x01, 0x1D, 0x80, 0x18, 0x71, 0x1C, 0x16, 0x20,
+    0x58, 0x2C, 0x25, 0x00, 0x0F, 0x48, 0x42, 0x00, 0x00, 0x9E, 0x01, 0x1D, 0x00, 0x72, 0x51, 0xD0,
+    0x1E, 0x20, 0x6E, 0x28, 0x55, 0x00, 0x0F, 0x48, 0x42, 0x00, 0x00, 0x1E, 0x00, 0x00, 0x00, 0xFC,
+    0x00, 0x41, 0x42, 0x43, 0x20, 0x4C, 0x43, 0x44, 0x34, 0x37, 0x77, 0x0A, 0x20, 0x20, 0x01, 0xCB,
+
+    0x02, 0x03, 0x18, 0x72, 0x47, 0x90, 0x85, 0x04, 0x03, 0x02, 0x07, 0x06, 0x23, 0x09, 0x07, 0x07,
+    0x83, 0x01, 0x00, 0x00, 0x65, 0x03, 0x0C, 0x00, 0x10, 0x00, 0x8E, 0x0A, 0xD0, 0x8A, 0x20, 0xE0,
+    0x2D, 0x10, 0x10, 0x3E, 0x96, 0x00, 0x1F, 0x09, 0x00, 0x00, 0x00, 0x18, 0x8E, 0x0A, 0xD0, 0x8A,
+    0x20, 0xE0, 0x2D, 0x10, 0x10, 0x3E, 0x96, 0x00, 0x04, 0x03, 0x00, 0x00, 0x00, 0x18, 0x8E, 0x0A,
+    0xA0, 0x14, 0x51, 0xF0, 0x16, 0x00, 0x26, 0x7C, 0x43, 0x00, 0x1F, 0x09, 0x00, 0x00, 0x00, 0x98,
+    0x8E, 0x0A, 0xA0, 0x14, 0x51, 0xF0, 0x16, 0x00, 0x26, 0x7C, 0x43, 0x00, 0x04, 0x03, 0x00, 0x00,
+    0x00, 0x98, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC9,
+  };
+
+  if ((Attributes == NULL) || (EdidSize == NULL) || (Edid == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  *Edid = (UINT8 *)AllocateCopyPool (sizeof (EdidBuffer), EdidBuffer);
+  if (*Edid == NULL) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  *EdidSize = sizeof (EdidBuffer);
+
+  /* Activate display output even if no attached monitor can be
+     detected. */
+  *Attributes = EFI_EDID_OVERRIDE_ENABLE_HOT_PLUG;
+
+  return EFI_SUCCESS;
+}
+
+STATIC EFI_EDID_OVERRIDE_PROTOCOL  mEfiEdidOverrideProtocol = {
+  .GetEdid = EfiEdidOverrideProtocolGetEdid
+};
+
 /**
   Callback that will be invoked at various phases of the driver initialization
 
@@ -1278,6 +1349,15 @@ DeviceDiscoveryNotify (
   CONST BOOLEAN                      OnExitBootServices = FALSE;
 
   switch (Phase) {
+    case DeviceDiscoveryDriverStart:
+      Status = gBS->InstallMultipleProtocolInterfaces (
+                      &DriverHandle,
+                      &gEfiEdidOverrideProtocolGuid,
+                      &mEfiEdidOverrideProtocol,
+                      NULL
+                      );
+      return Status;
+
     case DeviceDiscoveryDriverBindingSupported:
       Platform = TegraGetPlatform ();
       if (Platform != TEGRA_PLATFORM_SILICON) {

Silicon/NVIDIA/Drivers/NvDisplayControllerDxe/NvDisplayControllerDxe.inf

@@ -54,6 +54,7 @@
 [Protocols]
   gEdkiiNonDiscoverableDeviceProtocolGuid
   gEfiDevicePathProtocolGuid
+  gEfiEdidOverrideProtocolGuid
   gEfiGraphicsOutputProtocolGuid
   gNVIDIAClockNodeProtocolGuid
   gNVIDIANonDiscoverableDeviceProtocolGuid