Hi Hans,
On Mon, 10 November 2014 Hans de Goede wrote:
> On 11/08/2014 08:34 PM, Bruno Prémont wrote:
> > Since updating my cubietruck to u-boot-2014.10 the SATA hard drive
> > connected to it performs emergency head parking around the time
> > uboot hands over control to kernel (or kernel is booting).
> >
> > The same issue also exists during reboot.
>
> Right, during reboot there unfortunately is nothing we can do to avoid this
> afaik. Although there is one thing which you could try, edit:
>
> linux/drivers/ata/libahci_platform.c
>
> Around line 500 you should find the following in there:
>
> static void ahci_host_stop(struct ata_host *host)
> {
> struct ahci_host_priv *hpriv = host->private_data;
>
> ahci_platform_disable_resources(hpriv);
> }
>
> Try commenting out the ahci_platform_disable_resources() call, I'm not sure
> if this gets called at reboot / shutdown, but if it does then it could be
> the culprit, although I think the real problem is that the SoC at reset
> tri-states all its gpio-s.
I don't care too much about the linux shutdown/reboot as the patch I included
does a good job there. (also useful on my x86 Acer TM660 laptop!)
I might retry getting it upstream (a few years ago I sent one with DMI match
for just my laptop, but it was not applied).
With a few devices affected, and that cross-platform, applying it would
make some more sense.
> > Looking at the changes in u-boot-2014.10 SATA support has been added.
> >
> > It looks like u-boot is setting up SATA then kernel is doing the same,
> > killing SATA power while reconfiguring the AHCI or SATApower GPIO.
>
> Hmm, good one, I think we can avoid this from happening with the following
> patch:
>
> diff --git a/arch/arm/boot/dts/sunxi-common-regulators.dtsi
> b/arch/arm/boot/dts/sunxi-common-regulators.dtsi
> index c9c5b10..a950671 100644
> --- a/arch/arm/boot/dts/sunxi-common-regulators.dtsi
> +++ b/arch/arm/boot/dts/sunxi-common-regulators.dtsi
> @@ -44,6 +44,7 @@
> regulator-name = "ahci-5v";
> regulator-min-microvolt = <5000000>;
> regulator-max-microvolt = <5000000>;
> + regulator-boot-on;
> enable-active-high;
> gpio = <&pio 1 8 0>;
> status = "disabled";
>
> Can you try applying this, then do "make dtbs" in your kernel sources
> dir and copy the new cubietruck dtb file to your sdcard, and give things
> a spin ?
Works like a charm!
Does it have any impact when:
- u-boot does not support SATA/AHCI
- u-boot does not initialize SATA/AHCI
- there is no SATA drive connected?
Reported-and-Tested-by: Bruno Prémont <bonb...@linux-vserver.org>
Thanks,
Bruno
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