Re: [edk2-devel] [PATCH 6/7] Platform/RaspberryPi: Power up sd, and tweak GPIOs

["Jeremy Linton" <jeremy.linton@arm.com>]

Hi,

On 12/15/20 12:21 PM, Andrei Warkentin wrote:
> Could we rework some of these magic constants? Esp the SetPowerState ones.

Yes, I know from the mailbox description what the 1,1 do (on with 
wait?). But its clear as mud what the channel "0" really means. It seems 
to have varying definitions, from "power everything" to "power sd". So 
it may depend on model, but again, ugh, uboot is doing it.


> 
> Do we need both EMMC and EMMC2 clocks enabled all the time?

I think so, not so much for edk2, but for the resulting OS. At least 
until we get AML to power on/enable them.

Which is sorta a todo at this point for the platform, we really should 
be supporting the ACPI power states and forwarding that info via mailbox 
commands.

>  > A
> ________________________________
> From: devel@edk2.groups.io <devel@edk2.groups.io> on behalf of Jeremy Linton via groups.io <jeremy.linton=arm.com@groups.io>
> Sent: Monday, December 14, 2020 5:23 PM
> To: devel@edk2.groups.io <devel@edk2.groups.io>
> Cc: ard.biesheuvel@arm.com <ard.biesheuvel@arm.com>; leif@nuviainc.com <leif@nuviainc.com>; pete@akeo.ie <pete@akeo.ie>; andrey.warkentin@gmail.com <andrey.warkentin@gmail.com>; samer.el-haj-mahmoud@arm.com <samer.el-haj-mahmoud@arm.com>; Jeremy Linton <jeremy.linton@arm.com>
> Subject: [edk2-devel] [PATCH 6/7] Platform/RaspberryPi: Power up sd, and tweak GPIOs
> 
> It seems we should be powering up the sd cards, and possibly
> the clocks as well to assure they are setup properly before
> we attempt to access the controller.
> 
> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
> ---
>   Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c
> index 28f57438c5..8829740938 100644
> --- a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c
> +++ b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c
> @@ -552,6 +552,15 @@ ApplyVariables (
>         GpioPinFuncSet (37, GPIO_FSEL_ALT3);
> 
>         GpioPinFuncSet (38, GPIO_FSEL_ALT3);
> 
>         GpioPinFuncSet (39, GPIO_FSEL_ALT3);
> 
> +
> 
> +      /*
> 
> +       * power and clock everything by default
> 
> +       */
> 
> +      Status = mFwProtocol->SetPowerState (0, 1, 1); //SD on
> 
> +      Status = mFwProtocol->SetGpioConfig (RPI_EXP_GPIO_SD_VOLT,
> 
> +                                           RPI_EXP_GPIO_DIR_OUT, 1); //3.3v
> 
> +      Status = mFwProtocol->SetClockState (RPI_MBOX_CLOCK_RATE_EMMC2, 1);
> 
> +      Status = mFwProtocol->SetClockState (RPI_MBOX_CLOCK_RATE_EMMC, 1);
> 
>       }
> 
>     } else {
> 
>       DEBUG ((DEBUG_ERROR, "Model Family %d not supported...\n", mModelFamily));
> 
> --
> 2.13.7
> 
> 
> 
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