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MdeModulePkg/SdMmcPciHcDxe: Add function to start SD clock

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In SD card voltage switch flow we used to redo the
entire internal clock setup after voltage switch.
Since internal clock has already been setup this
is wasting time on polling the internal clock stable.
This commit changes it to only start the SD clock.

Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Marcin Wojtas <mw@semihalf.com>
Cc: Zhichao Gao <zhichao.gao@intel.com>
Cc: Liming Gao <liming.gao@intel.com>

Signed-off-by: Mateusz Albecki <mateusz.albecki@intel.com>
Tested-by: Marcin Wojtas <mw@semihalf.com>
Tested-by: Hao A Wu <hao.a.wu@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
This commit is contained in:
Albecki, Mateusz
2019-12-21 01:13:12 +08:00
committed by mergify[bot]
parent 49accdedf9
commit f68cb23c14
3 changed files with 47 additions and 12 deletions
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11
MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c
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@@ -1327,13 +1327,10 @@ SdCardIdentification (
goto Error;
}
//
// Restart the clock with first time parameters.
// NOTE: it is not required to actually restart the clock
// and go through internal clock setup again. Some time
// could be saved if we simply started the SD clock.
//
SdMmcHcClockSupply (Private, Slot, 0, TRUE, 400);
Status = SdMmcHcStartSdClock (PciIo, Slot);
if (EFI_ERROR (Status)) {
goto Error;
}
gBS->Stall (1000);