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MdeModulePkg/Sd: wait 1ms before check DATA line in voltage switch proc 

According to SD Host Controller 3.0 spec figure 3-10, we have to wait
1ms before checking DAT[3:0] in voltage switch proc

Cc: Hao Wu <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
This commit is contained in:
Feng Tian 2016-04-12 14:08:49 +08:00
parent 83ceccabd3
commit 2a8b78cfd5
2 changed files with 2 additions and 2 deletions
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2
MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c
View File

@ -1123,7 +1123,7 @@ SdCardIdentification (
SdMmcHcInitClockFreq (PciIo, Slot, Private->Capability[Slot]);
gBS->Stall (1);
gBS->Stall (1000);
SdMmcHcRwMmio (PciIo, Slot, SD_MMC_HC_PRESENT_STATE, TRUE, sizeof (PresentState), &PresentState);
if (((PresentState >> 20) & 0xF) != 0xF) {

2
MdeModulePkg/Bus/Sd/SdBlockIoPei/SdHci.c
View File

@ -2832,7 +2832,7 @@ SdPeimIdentification (
SdPeimHcInitClockFreq (Slot->SdHcBase);
MicroSecondDelay (1);
MicroSecondDelay (1000);
SdPeimHcRwMmio (Slot->SdHcBase + SD_HC_PRESENT_STATE, TRUE, sizeof (PresentState), &PresentState);
if (((PresentState >> 20) & 0xF) != 0xF) {