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MdeModulePkg/Ata: Clear PxCmd.SUD bit when the port has no device presented at AHCI mode.

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Signed-off-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Sun Rui <rui.sun@intel.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13370 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
erictian 2012-05-29 07:05:33 +00:00
parent fc80ee69cb
commit 2721fabc53
1 changed files with 3 additions and 0 deletions

3
MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c

@ -2278,7 +2278,10 @@ AhciModeInitialization (
if (PhyDetectDelay == 0) {
//
// No device detected at this port.
// Clear PxCMD.SUD for those ports at which there are no device present.
//
Offset = EFI_AHCI_PORT_START + Port * EFI_AHCI_PORT_REG_WIDTH + EFI_AHCI_PORT_CMD;
AhciAndReg (PciIo, Offset, (UINT32) ~(EFI_AHCI_PORT_CMD_SUD));
continue;
}