From 2a8b78cfd5f9e0f7f7a8c7111813054fb9040554 Mon Sep 17 00:00:00 2001 From: Feng Tian Date: Tue, 12 Apr 2016 14:08:49 +0800 Subject: 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 Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Feng Tian Reviewed-by: Hao Wu --- MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'MdeModulePkg/Bus/Pci') diff --git a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c index d05eb9e9e6..b2a08572fe 100644 --- a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c +++ b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c @@ -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) { -- cgit v1.2.3