add stdvga fix

0022-OvmfPkg-QemuVideoDxe-fix-bochs-mode-init.patch

@@ -0,0 +1,77 @@
+From 6f20526da6631302cac8a79fd2392bddd2514948 Mon Sep 17 00:00:00 2001
+From: Gerd Hoffmann <kraxel@redhat.com>
+Date: Wed, 7 Sep 2022 11:15:04 +0200
+Subject: [PATCH 22/22] OvmfPkg/QemuVideoDxe: fix bochs mode init
+
+Add VgaInb() helper function to read vga registers.  With that in place
+fix the unblanking.  We need to put the ATT_ADDRESS_REGISTER flip flop
+into a known state, which is done by reading the
+INPUT_STATUS_1_REGISTER.  Reading the INPUT_STATUS_1_REGISTER only works
+when the device is in color mode, so make sure that bit (0x01) is set in
+MISC_OUTPUT_REGISTER.
+
+Currently the mode setting works more by luck because
+ATT_ADDRESS_REGISTER flip flop happens to be in the state we need.
+
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
+(cherry picked from commit 512042eba87ff97a4820a55cf3b1a89a8afd1cc7)
+---
+ OvmfPkg/QemuVideoDxe/Driver.c | 34 +++++++++++++++++++++++++++++++++-
+ 1 file changed, 33 insertions(+), 1 deletion(-)
+
+diff --git a/OvmfPkg/QemuVideoDxe/Driver.c b/OvmfPkg/QemuVideoDxe/Driver.c
+index b91909a14e59..c28171d13719 100644
+--- a/OvmfPkg/QemuVideoDxe/Driver.c
++++ b/OvmfPkg/QemuVideoDxe/Driver.c
+@@ -984,6 +984,34 @@ VgaOutb (
+   }
+ }
+ 
++STATIC
++UINT8
++VgaInb (
++  QEMU_VIDEO_PRIVATE_DATA  *Private,
++  UINTN                    Reg
++  )
++{
++  EFI_STATUS  Status;
++  UINT8       Data;
++
++  if (Private->Variant == QEMU_VIDEO_BOCHS_MMIO) {
++    Data   = 0;
++    Status = Private->PciIo->Mem.Read (
++                                   Private->PciIo,
++                                   EfiPciIoWidthUint8,
++                                   PCI_BAR_IDX2,
++                                   0x400 - 0x3c0 + Reg,
++                                   1,
++                                   &Data
++                                   );
++    ASSERT_EFI_ERROR (Status);
++  } else {
++    Data = inb (Private, Reg);
++  }
++
++  return Data;
++}
++
+ VOID
+ InitializeBochsGraphicsMode (
+   QEMU_VIDEO_PRIVATE_DATA  *Private,
+@@ -998,7 +1026,11 @@ InitializeBochsGraphicsMode (
+     ModeData->ColorDepth
+     ));
+ 
+-  /* unblank */
++  /* set color mode */
++  VgaOutb (Private, MISC_OUTPUT_REGISTER, 0x01);
++
++  /* reset flip flop + unblank */
++  VgaInb (Private, INPUT_STATUS_1_REGISTER);
+   VgaOutb (Private, ATT_ADDRESS_REGISTER, 0x20);
+ 
+   BochsWrite (Private, VBE_DISPI_INDEX_ENABLE, 0);
+-- 
+2.37.3
+

edk2.spec

@@ -88,6 +88,7 @@ Patch0018: 0018-OvmfPkg-QemuKernelLoaderFsDxe-suppress-error-on-no-k.patch
 Patch0019: 0019-SecurityPkg-Tcg2Dxe-suppress-error-on-no-swtpm-in-si.patch
 Patch0020: 0020-Tweak-the-tools_def-to-support-cross-compiling.patch
 Patch0021: 0021-tools_def-add-fno-omit-frame-pointer-to-GCC48_-IA32-.patch
+Patch0022: 0022-OvmfPkg-QemuVideoDxe-fix-bochs-mode-init.patch
 
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