AudioDxe: Add --force-codec (#460)

Docs/Configuration.tex

@@ -7019,6 +7019,11 @@ the driver within the \texttt{UEFI/Drivers} section:
   will be achieved by using \texttt{Audio} section \texttt{SetupDelay} if any audio setup delay
   is required. Where required, values of up to one second may be needed. \medskip
 
+  \item \texttt{-{}-force-codec} - Integer value, default \texttt{0}. \medskip
+
+  Force use of an audio codec, this value should be equal to \texttt{Audio} section \texttt{AudioCodec}.
+  Can result in faster boot especially when used in conjuction with \texttt{-{}-force-device}. \medskip
+
 	\item \texttt{-{}-force-device} - String value, no default. \medskip
 
   When this option is present and has a value (e.g. \texttt{-{}-force-device=PciRoot(0x0)/Pci(0x1f,0x3)}), it

Staging/AudioDxe/AudioDxe.c

@@ -47,6 +47,12 @@ EFI_DEVICE_PATH_PROTOCOL *
 UINTN
   gCodecSetupDelay = 0;
 
+BOOLEAN
+  gUseForcedCodec = FALSE;
+
+UINTN
+  gForcedCodec = 0;
+
 /**
   HdaController Driver Binding.
 **/
@@ -120,6 +126,11 @@ AudioDxeInit (
 
     OcParsedVarsGetInt (ParsedLoadOptions, L"--codec-setup-delay", &gCodecSetupDelay, OcStringFormatUnicode);
 
+    Status = OcParsedVarsGetInt (ParsedLoadOptions, L"--force-codec", &gForcedCodec, OcStringFormatUnicode);
+    if (Status != EFI_NOT_FOUND) {
+      gUseForcedCodec = TRUE;
+    }
+
     OcFlexArrayFree (&ParsedLoadOptions);
   } else if (Status != EFI_NOT_FOUND) {
     return Status;

Staging/AudioDxe/AudioDxe.h

@@ -119,4 +119,16 @@ extern
 UINTN
   gCodecSetupDelay;
 
+//
+// Whether to use forced codec.
+//
+extern BOOLEAN
+  gUseForcedCodec;
+
+//
+// Forced codec number.
+//
+extern UINTN
+  gForcedCodec;
+
 #endif // EFI_AUDIODXE_H

Staging/AudioDxe/HdaCodec/HdaCodec.c

@@ -1726,6 +1726,12 @@ HdaCodecDriverBindingSupported (
     goto CLOSE_CODEC;
   }
 
+  // Check --force-codec.
+  if (gUseForcedCodec && (gForcedCodec != CodecAddress)) {
+    Status = EFI_UNSUPPORTED;
+    goto CLOSE_CODEC;
+  }
+
   // Codec can be supported.
   DEBUG ((DEBUG_INFO, "HDA: Connecting codec 0x%X\n", CodecAddress));
   Status = EFI_SUCCESS;