Re: [edk2-devel] [PATCH v3] MdeModulePkg: Enabling OS boot from SD card through UEFI payload

["Wu, Hao A" <hao.a.wu@intel.com>]

Change the subject of the commit to "MdeModulePkg/SdMmcPciHcDxe: Robust improvements for SD card 1.8V switch" in order to better reflect the purpose of the change.

Patch merged via:
PR - https://github.com/tianocore/edk2/pull/2438
Commit - https://github.com/tianocore/edk2/commit/7e5c603cba0823fd97456984f4cfc21c4c831b52

Best Regards,
Hao Wu

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Wu, Hao
> A
> Sent: Friday, January 21, 2022 8:57 AM
> To: devel@edk2.groups.io; Rosli, Muhammad Aiman
> <muhammad.aiman.rosli@intel.com>; Wang, Jian J <jian.j.wang@intel.com>;
> Gao, Liming <gaoliming@byosoft.com.cn>; Ni, Ray <ray.ni@intel.com>
> Subject: Re: [edk2-devel] [PATCH v3] MdeModulePkg: Enabling OS boot
> from SD card through UEFI payload
> 
> (Add missing maintainers/reviewers)
> 
> Reviewed-by: Hao A Wu <hao.a.wu@intel.com> Will wait until early next
> week for the merging to see if any comment from other reviewers.
> 
> Best Regards,
> Hao Wu
> 
> > -----Original Message-----
> > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Aiman
> > Rosli
> > Sent: Friday, January 21, 2022 2:53 AM
> > To: devel@edk2.groups.io
> > Cc: Rosli, Muhammad Aiman <muhammad.aiman.rosli@intel.com>
> > Subject: [edk2-devel] [PATCH v3] MdeModulePkg: Enabling OS boot from
> > SD card through UEFI payload
> >
> > This changes is by adding 50ms delay during voltage switching from
> > 3.3V to 1.8V, plus adding a goto Voltage33Retry for 3.3V checking and
> retrying.
> >
> > Signed-off-by: Aiman Rosli <muhammad.aiman.rosli@intel.com>
> > ---
> >  MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c | 39
> > +++++++++++++++++--
> >  1 file changed, 36 insertions(+), 3 deletions(-)
> >
> > diff --git a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c
> > b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c
> > index 662f9f483c..f5a3607e47 100644
> > --- a/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c
> > +++ b/MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c
> > @@ -1213,9 +1213,14 @@ SdCardIdentification (
> >    UINT32                         PresentState;
> >    UINT8                          HostCtrl2;
> >    UINTN                          Retry;
> > +  BOOLEAN                        ForceVoltage33;
> > +
> > +  ForceVoltage33 = FALSE;
> >
> >    PciIo    = Private->PciIo;
> >    PassThru = &Private->PassThru;
> > +
> > +Voltage33Retry:
> >    //
> >    // 1. Send Cmd0 to the device
> >    //
> > @@ -1294,6 +1299,13 @@ SdCardIdentification (
> >      return EFI_UNSUPPORTED;
> >    }
> >
> > +  //
> > +  // 1.8V had failed in the previous run, forcing a retry with 3.3V
> > + instead  //  if (ForceVoltage33 == TRUE) {
> > +    S18r = FALSE;
> > +  }
> > +
> >    //
> >    // 5. Repeatly send Acmd41 with supply voltage window to the device.
> >    //    Note here we only support the cards complied with SD physical
> > @@ -1366,9 +1378,30 @@ SdCardIdentification (
> >
> >        SdMmcHcRwMmio (PciIo, Slot, SD_MMC_HC_PRESENT_STATE, TRUE,
> > sizeof (PresentState), &PresentState);
> >        if (((PresentState >> 20) & 0xF) != 0xF) {
> > -        DEBUG ((DEBUG_ERROR, "SdCardIdentification: SwitchVoltage fails
> with
> > PresentState = 0x%x, It should be 0xF\n", PresentState));
> > -        Status = EFI_DEVICE_ERROR;
> > -        goto Error;
> > +        //
> > +        // Delay 50 milliseconds in order for clock to stabilize,
> > + retry reading the
> > SD_MMC_HC_PRESENT_STATE
> > +        //
> > +        gBS->Stall (50000);
> > +        SdMmcHcRwMmio (PciIo, Slot, SD_MMC_HC_PRESENT_STATE, TRUE,
> > sizeof (PresentState), &PresentState);
> > +        if (((PresentState >> 20) & 0xF) != 0xF) {
> > +          DEBUG ((DEBUG_ERROR, "SdCardIdentification: SwitchVoltage
> > + fails
> > with PresentState = 0x%x, It should be 0xF\n", PresentState));
> > +          //
> > +          // Reset and reinitialize the slot before the 3.3V retry.
> > +          //
> > +          Status = SdMmcHcReset (Private, Slot);
> > +          if (EFI_ERROR (Status)) {
> > +            goto Error;
> > +          }
> > +
> > +          Status = SdMmcHcInitHost (Private, Slot);
> > +          if (EFI_ERROR (Status)) {
> > +            goto Error;
> > +          }
> > +
> > +          DEBUG ((DEBUG_ERROR, "SdCardIdentification: Switching to
> > + 1.8V
> > failed, forcing a retry with 3.3V instead\n"));
> > +          ForceVoltage33 = TRUE;
> > +          goto Voltage33Retry;
> > +        }
> >        }
> >      }
> >
> > --
> > 2.34.1.windows.1
> >
> >
> >
> >
> >
> 
> 
> 
> 
>