From: Feng Tian <feng.tian@intel.com>
To: star.zeng@intel.com
Cc: edk2-devel@lists.01.org
Subject: [patch] MdeModulePkg/XhciPei: 1ms delay before accessing MMIO reg in reset
Date: Wed, 14 Sep 2016 09:49:19 +0800 [thread overview]
Message-ID: <bac7edb3631a5d8e9a86be1336b46008364c9bf9.1473817726.git.feng.tian@intel.com> (raw)
Some XHCI HCs require to have 1ms delay before accessing any MMIO
register in reset.
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Feng Tian <feng.tian@intel.com>
---
MdeModulePkg/Bus/Pci/XhciPei/XhcPeim.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/MdeModulePkg/Bus/Pci/XhciPei/XhcPeim.c b/MdeModulePkg/Bus/Pci/XhciPei/XhcPeim.c
index a58739f..cd5c5cd 100644
--- a/MdeModulePkg/Bus/Pci/XhciPei/XhcPeim.c
+++ b/MdeModulePkg/Bus/Pci/XhciPei/XhcPeim.c
@@ -407,6 +407,7 @@ XhcPeiResetHC (
}
XhcPeiSetOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RESET);
+ MicroSecondDelay (1000);
Status = XhcPeiWaitOpRegBit (Xhc, XHC_USBCMD_OFFSET, XHC_USBCMD_RESET, FALSE, Timeout);
ON_EXIT:
DEBUG ((EFI_D_INFO, "XhcPeiResetHC: %r\n", Status));
--
2.7.1.windows.2
next reply other threads:[~2016-09-14 1:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-14 1:49 Feng Tian [this message]
2016-09-14 2:56 ` [patch] MdeModulePkg/XhciPei: 1ms delay before accessing MMIO reg in reset Zeng, Star
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