MdeModulePkg/AtaAtapiPassThru: Ensure GHC.AE bit is always set in Ahci

According to AHCI Spec 1.3 GHC.AE bit description:
"The implementation of this bit is dependent upon the value of the
CAP.SAM bit. If CAP.SAM is '0', then GHC.AE shall be read-write and shall
have a reset value of '0'. If CAP.SAM is '1', then AE shall be read-only
and shall have a reset value of '1'."

Being in AhciMode, for proper operation it is required, that GHC.AE bit
is always set, before any other AHCI registers are written to. Current
AhciMode implementation, both in AhciReset() and AhciModeInitialization()
functions, set GHC.AE bit only depending on 'CAP.SAM == 0' condition,
assuming (according to the AHCI spec), that otherwise it has to be set
anyway. It may however happen, that even if 'CAP.SAM == 1', GHC.AE
requires updating by software.

This patch enables in AhciMode setting GHC.AE in case its initial value
is '0'. It fixes AHCI support for Marvell Armada 70x0 and 80x0 SoC
families. The change is transparent to all other platforms.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: Jan Dabros <jsd@semihalf.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
index 533d2013894fdb850cd00046513978c243c6f6ae..4d01c1dd7fca2c70d97250e9bace7840135e4d09 100644 (file)
--- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
+++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
@@ -1451,17 +1451,13 @@ AhciReset (
 {\r
   UINT64                 Delay;\r
   UINT32                 Value;\r
-  UINT32                 Capability;\r
 \r
   //\r
-  // Collect AHCI controller information\r
-  //\r
-  Capability = AhciReadReg (PciIo, EFI_AHCI_CAPABILITY_OFFSET);\r
-  \r
-  //\r
-  // Enable AE before accessing any AHCI registers if Supports AHCI Mode Only is not set\r
+  // Make sure that GHC.AE bit is set before accessing any AHCI registers.\r
   //\r
-  if ((Capability & EFI_AHCI_CAP_SAM) == 0) {\r
+  Value = AhciReadReg(PciIo, EFI_AHCI_GHC_OFFSET);\r
+\r
+  if ((Value & EFI_AHCI_GHC_ENABLE) == 0) {\r
     AhciOrReg (PciIo, EFI_AHCI_GHC_OFFSET, EFI_AHCI_GHC_ENABLE);\r
   }\r
 \r
@@ -2252,6 +2248,7 @@ AhciModeInitialization (
   EFI_ATA_COLLECTIVE_MODE          *SupportedModes;\r
   EFI_ATA_TRANSFER_MODE            TransferMode;\r
   UINT32                           PhyDetectDelay;\r
+  UINT32                           Value;\r
 \r
   if (Instance == NULL) {\r
     return EFI_INVALID_PARAMETER;\r
@@ -2270,11 +2267,13 @@ AhciModeInitialization (
   // Collect AHCI controller information\r
   //\r
   Capability = AhciReadReg (PciIo, EFI_AHCI_CAPABILITY_OFFSET);\r
-  \r
+\r
   //\r
-  // Enable AE before accessing any AHCI registers if Supports AHCI Mode Only is not set\r
+  // Make sure that GHC.AE bit is set before accessing any AHCI registers.\r
   //\r
-  if ((Capability & EFI_AHCI_CAP_SAM) == 0) {\r
+  Value = AhciReadReg(PciIo, EFI_AHCI_GHC_OFFSET);\r
+\r
+  if ((Value & EFI_AHCI_GHC_ENABLE) == 0) {\r
     AhciOrReg (PciIo, EFI_AHCI_GHC_OFFSET, EFI_AHCI_GHC_ENABLE);\r
   }\r
 \r