[PATCH 1/1] MdeModulePkg/SdMmcPciHcDxe Fix eMMC HS400 switch sequence

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

In eMMC HS400 switch sequence flow eMMC driver attampted
to execute SEND_STATUS just after switching bus timing to high
speed and before downgrading clock frequency to 52MHz. Since link
was at that time in incorrect state SEND_STATUS was failing which
made driver think switch to HS400 failed.
This change makes driver always change clock frequency after
switching bus timing and before executing SEND_STATUS.

Change-Id: Ib1f2c78a8693c2a4ef6e1f1b5da2f4133f6210d2
Cc: Hao Wu <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Albecki Mateusz <mateusz.albecki@intel.com>
---
 MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c | 37 +++++++++++++------------
 1 file changed, 19 insertions(+), 18 deletions(-)

diff --git a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c
index 4ef849fd0962..22200f806f26 100644
--- a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c
+++ b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c
@@ -642,7 +642,7 @@ EmmcSwitchBusWidth (
 }
 
 /**
-  Switch the clock frequency to the specified value.
+  Switch the bus timing and clock frequency.
 
   Refer to EMMC Electrical Standard Spec 5.1 Section 6.6 and SD Host Controller
   Simplified Spec 3.0 Figure 3-3 for details.
@@ -660,7 +660,7 @@ EmmcSwitchBusWidth (
 
 **/
 EFI_STATUS
-EmmcSwitchClockFreq (
+EmmcSwitchBusTiming (
   IN EFI_PCI_IO_PROTOCOL                *PciIo,
   IN EFI_SD_MMC_PASS_THRU_PROTOCOL      *PassThru,
   IN UINT8                              Slot,
@@ -693,18 +693,6 @@ EmmcSwitchClockFreq (
     return Status;
   }
 
-  Status = EmmcSendStatus (PassThru, Slot, Rca, &DevStatus);
-  if (EFI_ERROR (Status)) {
-    DEBUG ((DEBUG_ERROR, "EmmcSwitchClockFreq: Send status fails with %r\n", Status));
-    return Status;
-  }
-  //
-  // Check the switch operation is really successful or not.
-  //
-  if ((DevStatus & BIT7) != 0) {
-    DEBUG ((DEBUG_ERROR, "EmmcSwitchClockFreq: The switch operation fails as DevStatus is 0x%08x\n", DevStatus));
-    return EFI_DEVICE_ERROR;
-  }
   //
   // Convert the clock freq unit from MHz to KHz.
   //
@@ -713,6 +701,19 @@ EmmcSwitchClockFreq (
     return Status;
   }
 
+  Status = EmmcSendStatus (PassThru, Slot, Rca, &DevStatus);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "EmmcSwitchClockFreq: Send status fails with %r\n", Status));
+    return Status;
+  }
+  //
+  // Check the switch operation is really successful or not.
+  //
+  if ((DevStatus & BIT7) != 0) {
+    DEBUG ((DEBUG_ERROR, "EmmcSwitchClockFreq: The switch operation fails as DevStatus is 0x%08x\n", DevStatus));
+    return EFI_DEVICE_ERROR;
+  }
+
   if (mOverride != NULL && mOverride->NotifyPhase != NULL) {
     Status = mOverride->NotifyPhase (
                           Private->ControllerHandle,
@@ -799,7 +800,7 @@ EmmcSwitchToHighSpeed (
   }
 
   HsTiming = 1;
-  Status = EmmcSwitchClockFreq (PciIo, PassThru, Slot, Rca, HsTiming, Timing, ClockFreq);
+  Status = EmmcSwitchBusTiming (PciIo, PassThru, Slot, Rca, HsTiming, Timing, ClockFreq);
 
   return Status;
 }
@@ -887,7 +888,7 @@ EmmcSwitchToHS200 (
   Status = SdMmcHcOrMmio (PciIo, Slot, SD_MMC_HC_CLOCK_CTRL, sizeof (ClockCtrl), &ClockCtrl);
 
   HsTiming = 2;
-  Status = EmmcSwitchClockFreq (PciIo, PassThru, Slot, Rca, HsTiming, Timing, ClockFreq);
+  Status = EmmcSwitchBusTiming (PciIo, PassThru, Slot, Rca, HsTiming, Timing, ClockFreq);
   if (EFI_ERROR (Status)) {
     return Status;
   }
@@ -937,7 +938,7 @@ EmmcSwitchToHS400 (
   // Set to Hight Speed timing and set the clock frequency to a value less than 52MHz.
   //
   HsTiming = 1;
-  Status = EmmcSwitchClockFreq (PciIo, PassThru, Slot, Rca, HsTiming, SdMmcMmcHsSdr, 52);
+  Status = EmmcSwitchBusTiming (PciIo, PassThru, Slot, Rca, HsTiming, SdMmcMmcHsSdr, 52);
   if (EFI_ERROR (Status)) {
     return Status;
   }
@@ -957,7 +958,7 @@ EmmcSwitchToHS400 (
   }
 
   HsTiming = 3;
-  Status = EmmcSwitchClockFreq (PciIo, PassThru, Slot, Rca, HsTiming, Timing, ClockFreq);
+  Status = EmmcSwitchBusTiming (PciIo, PassThru, Slot, Rca, HsTiming, Timing, ClockFreq);
 
   return Status;
 }
-- 
2.14.1.windows.1

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