Re: [PATCH] Edk2/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c:XhcCreateUsbHc: check return value of XHC_PAGESIZE_OFFSET

["Wu, Hao A" <hao.a.wu@intel.com>]

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Hello Hamel, Lee M

Could you help to resend the patch? I found that I cannot extract the patch from your mail. Please help to check if you follow the instructions in step 12 to generate the patch in the below link:
https://github.com/tianocore/tianocore.github.io/wiki/EDK-II-Development-Process#the-developer-process-for-the-edk-ii-project
Thanks in advance.

Also, I would like to get more information on the problematic XHC.
Do all the XHCI operational registers & capability registers (i.e. registers in MMIO space) return a value of all 1s after read or the issue just happens to the Page Size register?
If the issue occurs to all the MMIO registers, my guess is that the MMIO resource allocation/configuration might not be done properly for the XHC.

One more inline comment below marked as "[Hao]:"


From: Hamel, Lee M <lee.m.hamel@intel.com>
Sent: Saturday, June 18, 2022 10:38 AM
To: devel@edk2.groups.io
Cc: Wu, Hao A <hao.a.wu@intel.com>; Ni, Ray <ray.ni@intel.com>
Subject: [PATCH] Edk2/MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c:XhcCreateUsbHc: check return value of XHC_PAGESIZE_OFFSET

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3954

--- C:\Edk2\MdeModulePkg\Bus\Pci\XhciDxe\Xhci.c         Tue Jun 14 21:29:21 2022 UTC
+++ C:\myEdk2\MdeModulePkg\Bus\Pci\XhciDxe\Xhci.c Tue Jun 14 21:26:57 2022 UTC
@@ -1,7 +1,7 @@
/** @file
   The XHCI controller driver.

-Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2011 - 2022, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

 **/
@@ -1813,7 +1813,12 @@
   // This xHC supports a page size of 2^(n+12) if bit n is Set. For example,
   // if bit 0 is Set, the xHC supports 4k byte page sizes.
   //
-  PageSize      = XhcReadOpReg (Xhc, XHC_PAGESIZE_OFFSET) & XHC_PAGESIZE_MASK;
+  PageSize      = XhcReadOpReg (Xhc, XHC_PAGESIZE_OFFSET);
+  if(PageSize == 0xFFFFFFFF) {
+  DEBUG ((DEBUG_INFO, "XhcCreateUsb3Hc: error reading XHC_PAGESIZE_OFFSET\n"));


[Hao]: Please use DEBUG_ERROR for error handling.

Best Regards,
Hao Wu


+    goto ON_ERROR;
+  }
+  PageSize      &= XHC_PAGESIZE_MASK;
   Xhc->PageSize = 1 << (HighBitSet32 (PageSize) + 12);

   ExtCapReg              = (UINT16)(Xhc->HcCParams.Data.ExtCapReg);


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