linux-kernel - Re: dw_mmc: HLE errors

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Date:	Mon, 23 Nov 2015 08:57:32 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
Cc:	Jaehoon Chung <jh80.chung@...sung.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Sonny Rao <sonnyrao@...omium.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Heiko Stübner <heiko@...ech.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: dw_mmc: HLE errors

Jorge,

On Mon, Nov 23, 2015 at 6:10 AM, Jorge Ramirez-Ortiz
<jorge.ramirez-ortiz@...aro.org> wrote:
> Doug/Jaehoon,
>
> Were there any follow ups to this thread [1] from March 30, 2015?
> We are seeing HLE errors on 3.18 and we are trying to determine if a solution
> was ever delivered.
> On inspection, I can't find anything specific in recent kernels that address
> this particular issue (was the actual root cause identified?)
>
> I put together a possible work-around that avoids the HLE storm from occurring
> for this specific SoC [2].
> However we'd rather not merge this -or any other similar fix- if there is a
> generic solution already that we can pick up from mainline.

Nothing landed that I'm aware of.  Are you on SDIO, SD or eMMC?
Trying to do UHS?

I know that this patch mattered for me for UHS:

  7c5209c315ea mmc: core: Increase delay for voltage to stabilize from
3.3V to 1.8V


Also important for UHS (for at least some folks) were patches like:

  9c85f37a2984 mmc: core: Add mmc_regulator_set_vqmmc()

...that attempted to get voltages more proper...


In the ChromeOS tree we did just land treating HLE errors as data and
cmd errors <https://patchwork.kernel.org/patch/5978711/>.  It's not
wonderful but it's better than letting an interrupt go off forever...


-Doug
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