[PATCH v3 2/3] MdeModulePkg/SdMmcPciHcDxe: Fix SdMmcHcReset to set only necesery bits

[Marcin Wojtas <mw@semihalf.com>]

From: Tomasz Michalec <tm@semihalf.com>

SdMmcHcReset used to set all bits of Software Reset Register to 1
including reserved ones.

Now only first bit is set which means "Software Reset for All".

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
---
 MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.h | 5 +++++
 MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.c | 6 +++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.h b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.h
index e389d52..bcc31bd 100644
--- a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.h
+++ b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.h
@@ -63,6 +63,11 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #define SD_MMC_HC_CTRL_VER            0xFE
 
 //
+// SD Software Reset Register bits description
+//
+#define SD_MMC_HC_SW_RST_ALL          BIT0
+
+//
 // The transfer modes supported by SD Host Controller
 // Simplified Spec 3.0 Table 1-2
 //
diff --git a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.c b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.c
index 9672b5b..9d9bca8 100644
--- a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.c
+++ b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.c
@@ -454,8 +454,8 @@ SdMmcHcReset (
   }
 
   PciIo   = Private->PciIo;
-  SwReset = 0xFF;
-  Status  = SdMmcHcRwMmio (PciIo, Slot, SD_MMC_HC_SW_RST, FALSE, sizeof (SwReset), &SwReset);
+  SwReset = SD_MMC_HC_SW_RST_ALL;
+  Status  = SdMmcHcOrMmio (PciIo, Slot, SD_MMC_HC_SW_RST, sizeof (SwReset), &SwReset);
 
   if (EFI_ERROR (Status)) {
     DEBUG ((DEBUG_ERROR, "SdMmcHcReset: write full 1 fails: %r\n", Status));
@@ -467,7 +467,7 @@ SdMmcHcReset (
              Slot,
              SD_MMC_HC_SW_RST,
              sizeof (SwReset),
-             0xFF,
+             SD_MMC_HC_SW_RST_ALL,
              0x00,
              SD_MMC_HC_GENERIC_TIMEOUT
              );
-- 
2.7.4