[PATCHv2 2/3] MdeModulePkg/SdMmcPciHcDxe: Fix bus timing switch sequence

["Albecki, Mateusz" <mateusz.albecki@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2218

SD specification recommends switching card bus timing before
switching bus timing in controller. Emmc driver used to do
this switch other way around. This commit adds controller
timing switch in EmmcSwitchBusTiming function to enforce this
order and removes all controller timing programing from
EmmcSwitchToXXX functions.

Signed-off-by: Mateusz Albecki <mateusz.albecki@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Marcin Wojtas <mw@semihalf.com>
---
 MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c | 70 +++++++++----------------
 1 file changed, 26 insertions(+), 44 deletions(-)

diff --git a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c
index bd70490286..3598a8538a 100644
--- a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c
+++ b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c
@@ -671,6 +671,7 @@ EmmcSwitchBusTiming (
   UINT8                     CmdSet;
   UINT32                    DevStatus;
   SD_MMC_HC_PRIVATE_DATA    *Private;
+  UINT8                     HostCtrl1;
 
   Private = SD_MMC_HC_PRIVATE_FROM_THIS (PassThru);
   //
@@ -704,6 +705,25 @@ EmmcSwitchBusTiming (
     return Status;
   }
 
+  if (BusTiming == SdMmcMmcHsSdr || BusTiming == SdMmcMmcHsDdr) {
+    HostCtrl1 = BIT2;
+    Status = SdMmcHcOrMmio (PciIo, Slot, SD_MMC_HC_HOST_CTRL1, sizeof (HostCtrl1), &HostCtrl1);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+  } else {
+    HostCtrl1 = (UINT8)~BIT2;
+    Status = SdMmcHcAndMmio (PciIo, Slot, SD_MMC_HC_HOST_CTRL1, sizeof (HostCtrl1), &HostCtrl1);
+    if (EFI_ERROR (Status)) {
+      return Status;
+    }
+  }
+
+  Status = SdMmcHcUhsSignaling (Private->ControllerHandle, PciIo, Slot, BusTiming);
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
   //
   // Convert the clock freq unit from MHz to KHz.
   //
@@ -771,12 +791,8 @@ EmmcSwitchToHighSpeed (
   IN SD_MMC_BUS_SETTINGS                *BusMode
   )
 {
-  EFI_STATUS              Status;
-  UINT8                   HostCtrl1;
-  SD_MMC_HC_PRIVATE_DATA  *Private;
-  BOOLEAN                 IsDdr;
-
-  Private = SD_MMC_HC_PRIVATE_FROM_THIS (PassThru);
+  EFI_STATUS  Status;
+  BOOLEAN     IsDdr;
 
   if ((BusMode->BusTiming != SdMmcMmcHsSdr && BusMode->BusTiming != SdMmcMmcHsDdr) ||
       BusMode->ClockFreq > 52) {
@@ -794,20 +810,6 @@ EmmcSwitchToHighSpeed (
     return Status;
   }
 
-  //
-  // Set to High Speed timing
-  //
-  HostCtrl1 = BIT2;
-  Status = SdMmcHcOrMmio (PciIo, Slot, SD_MMC_HC_HOST_CTRL1, sizeof (HostCtrl1), &HostCtrl1);
-  if (EFI_ERROR (Status)) {
-    return Status;
-  }
-
-  Status = SdMmcHcUhsSignaling (Private->ControllerHandle, PciIo, Slot, BusMode->BusTiming);
-  if (EFI_ERROR (Status)) {
-    return Status;
-  }
-
   return EmmcSwitchBusTiming (PciIo, PassThru, Slot, Rca, BusMode->DriverStrength, BusMode->BusTiming, BusMode->ClockFreq);
 }
 
@@ -836,10 +838,7 @@ EmmcSwitchToHS200 (
   IN SD_MMC_BUS_SETTINGS                *BusMode
   )
 {
-  EFI_STATUS               Status;
-  SD_MMC_HC_PRIVATE_DATA  *Private;
-
-  Private = SD_MMC_HC_PRIVATE_FROM_THIS (PassThru);
+  EFI_STATUS  Status;
 
   if (BusMode->BusTiming != SdMmcMmcHs200 ||
       (BusMode->BusWidth != 4 && BusMode->BusWidth != 8)) {
@@ -851,11 +850,6 @@ EmmcSwitchToHS200 (
     return Status;
   }
 
-  Status = SdMmcHcUhsSignaling (Private->ControllerHandle, PciIo, Slot, BusMode->BusTiming);
-  if (EFI_ERROR (Status)) {
-    return Status;
-  }
-
   Status = EmmcSwitchBusTiming (PciIo, PassThru, Slot, Rca, BusMode->DriverStrength, BusMode->BusTiming, BusMode->ClockFreq);
   if (EFI_ERROR (Status)) {
     return Status;
@@ -891,17 +885,15 @@ EmmcSwitchToHS400 (
   IN SD_MMC_BUS_SETTINGS                *BusMode
   )
 {
-  EFI_STATUS                 Status;
-  SD_MMC_HC_PRIVATE_DATA     *Private;
-  SD_MMC_BUS_SETTINGS        Hs200BusMode;
-  UINT32                     HsFreq;
+  EFI_STATUS           Status;
+  SD_MMC_BUS_SETTINGS  Hs200BusMode;
+  UINT32               HsFreq;
 
   if (BusMode->BusTiming != SdMmcMmcHs400 ||
       BusMode->BusWidth != 8) {
     return EFI_INVALID_PARAMETER;
   }
 
-  Private = SD_MMC_HC_PRIVATE_FROM_THIS (PassThru);
   Hs200BusMode.BusTiming = SdMmcMmcHs200;
   Hs200BusMode.BusWidth = BusMode->BusWidth;
   Hs200BusMode.ClockFreq = BusMode->ClockFreq;
@@ -916,11 +908,6 @@ EmmcSwitchToHS400 (
   // Set to High Speed timing and set the clock frequency to a value less than or equal to 52MHz.
   // This step is necessary to be able to switch Bus into 8 bit DDR mode which is unsupported in HS200.
   //
-  Status = SdMmcHcUhsSignaling (Private->ControllerHandle, PciIo, Slot, SdMmcMmcHsSdr);
-  if (EFI_ERROR (Status)) {
-    return Status;
-  }
-
   HsFreq = BusMode->ClockFreq < 52 ? BusMode->ClockFreq : 52;
   Status = EmmcSwitchBusTiming (PciIo, PassThru, Slot, Rca, BusMode->DriverStrength, SdMmcMmcHsSdr, HsFreq);
   if (EFI_ERROR (Status)) {
@@ -932,11 +919,6 @@ EmmcSwitchToHS400 (
     return Status;
   }
 
-  Status = SdMmcHcUhsSignaling (Private->ControllerHandle, PciIo, Slot, BusMode->BusTiming);
-  if (EFI_ERROR (Status)) {
-    return Status;
-  }
-
   return EmmcSwitchBusTiming (PciIo, PassThru, Slot, Rca, BusMode->DriverStrength, BusMode->BusTiming, BusMode->ClockFreq);
 }
 
-- 
2.14.1.windows.1

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