linux-kernel - Re: [PATCH] arm64: dts: hikey: Revert "Enable HS200 mode on eMMC"

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Date:   Fri, 25 Jan 2019 09:41:48 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Ryan Grachek <ryan@...ted.us>,
        Alistair Strachan <astrachan@...gle.com>,
        Wei Xu <xuwei5@...ilicon.com>,
        Rob Herring <robh+dt@...nel.org>,
        "stable #4 . 17+" <stable@...r.kernel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64: dts: hikey: Revert "Enable HS200 mode on eMMC"

On Thu, Jan 24, 2019 at 3:18 AM Robin Murphy <robin.murphy@....com> wrote:
>
> Hi John,
>
> On 23/01/2019 20:06, John Stultz wrote:
> > From: Alistair Strachan <astrachan@...gle.com>
> >
> > This reverts commit abd7d0972a192ee653efc7b151a6af69db58f2bb. This
> > change was already partially reverted by John Stultz in commit
> > 9c6d26df1fae ("arm64: dts: hikey: Fix eMMC corruption regression").
> >
> > This change appears to cause controller resets and block read failures
> > which prevents successful booting on some hikey boards.
>
> FWIW, you might want to have a play with the pinctrl settings - I've
> seen various flakiness with HS200 eMMCs on Rockchip boards which could
> be solved by bumping up the drive strength.
>

Hm. Thanks for the tip. I'll have to dig around to see if that can
help. In the meantime though, I think the revert is the right
solution, as this is currently blocking some boards from booting
mainline.  We can then look to re-enable HS200 mode if we can sort out
the issues we saw with boards using hynix mmc chips.

thanks
-john