Re: [PATCH] MdeModulePkg/Bus/Pci/PciBusDxe: Increase the width of the data read during oprom shadow

["Sumana Venur" <sumana.venur@intel.com>]

Hello Maintainers 

This patch is for MdeModulePkg/Bus. Please review and help with merging to master
It was sent a few months ago, might have been reviewed already. But due to CI failures and low importance it was lost.

Gerrit link - https://git-amr-7.devtools.intel.com/gerrit/#/c/117842/

Thanks
Sumana

-----Original Message-----
From: Venur, Sumana <sumana.venur@intel.com> 
Sent: Friday, June 11, 2021 9:38 AM
To: devel@edk2.groups.io
Cc: Venur, Sumana <sumana.venur@intel.com>
Subject: [PATCH] MdeModulePkg/Bus/Pci/PciBusDxe: Increase the width of the data read during oprom shadow

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2989

Long times spent on shadowing oprom from graphics card to system memory. We are currently using 8 bit read cycles.
This needs to be wider, at least 32bit reads to reduce the time for oprom shadow

Signed-off-by: Sumana Venur <sumana.venur@intel.com>
---
 MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c
index c994ed5fe3..a981f93f43 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c
@@ -521,9 +521,9 @@ LoadOpRomImage (
     //
     PciDevice->PciRootBridgeIo->Mem.Read (
                                       PciDevice->PciRootBridgeIo,
-                                      EfiPciWidthUint8,
+                                      EfiPciWidthUint32,
                                       RomBar,
-                                      (UINT32) RomImageSize,
+                                      (UINT32) RomImageSize/sizeof(UINT32),
                                       Image
                                       );
     RomInMemory = Image;
-- 
2.16.2.windows.1