diff options
Diffstat (limited to 'MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c')
-rw-r--r-- | MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c index 72b1e5cc7e..186d40c062 100644 --- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c +++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c @@ -1440,8 +1440,19 @@ AhciReset ( {
UINT64 Delay;
UINT32 Value;
+ UINT32 Capability;
- AhciOrReg (PciIo, EFI_AHCI_GHC_OFFSET, EFI_AHCI_GHC_ENABLE);
+ //
+ // Collect AHCI controller information
+ //
+ Capability = AhciReadReg (PciIo, EFI_AHCI_CAPABILITY_OFFSET);
+
+ //
+ // Enable AE before accessing any AHCI registers if Supports AHCI Mode Only is not set
+ //
+ if ((Capability & EFI_AHCI_CAP_SAM) == 0) {
+ AhciOrReg (PciIo, EFI_AHCI_GHC_OFFSET, EFI_AHCI_GHC_ENABLE);
+ }
AhciOrReg (PciIo, EFI_AHCI_GHC_OFFSET, EFI_AHCI_GHC_RESET);
@@ -2245,15 +2256,17 @@ AhciModeInitialization ( }
//
- // Enable AE before accessing any AHCI registers
+ // Collect AHCI controller information
//
- AhciOrReg (PciIo, EFI_AHCI_GHC_OFFSET, EFI_AHCI_GHC_ENABLE);
-
+ Capability = AhciReadReg (PciIo, EFI_AHCI_CAPABILITY_OFFSET);
+
//
- // Collect AHCI controller information
+ // Enable AE before accessing any AHCI registers if Supports AHCI Mode Only is not set
//
- Capability = AhciReadReg(PciIo, EFI_AHCI_CAPABILITY_OFFSET);
-
+ if ((Capability & EFI_AHCI_CAP_SAM) == 0) {
+ AhciOrReg (PciIo, EFI_AHCI_GHC_OFFSET, EFI_AHCI_GHC_ENABLE);
+ }
+
//
// Get the number of command slots per port supported by this HBA.
//
|