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MdeModulePkg\Bus\Ata\AtaAtapiPassThru: don't set PxSACT bit when issuing command 

Setting a bit in the PxSACT register for a command in the command list indicates
to the controller that the command list slot contains a native queued command (NCQ).
This can cause problems with some controllers (one such controller is the Marvell 9128).
Since NCQ commands are not used, don't set the PxACT register for commands issued.

Contributed-under: TianoCore Contribution Agreement 1.0

Signed-off-by: Chris Ruffin <chris.ruffin@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16536 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Chris Ruffin 2014-12-18 06:13:36 +00:00 committed by erictian
parent 07f986f134
commit 6a497016c9
1 changed files with 0 additions and 4 deletions
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4
MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
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@ -1340,10 +1340,6 @@ AhciStartCommand (
//
// Setting the command
//
Offset = EFI_AHCI_PORT_START + Port * EFI_AHCI_PORT_REG_WIDTH + EFI_AHCI_PORT_SACT;
AhciAndReg (PciIo, Offset, 0);
AhciOrReg (PciIo, Offset, CmdSlotBit);
Offset = EFI_AHCI_PORT_START + Port * EFI_AHCI_PORT_REG_WIDTH + EFI_AHCI_PORT_CI;
AhciAndReg (PciIo, Offset, 0);
AhciOrReg (PciIo, Offset, CmdSlotBit);