linux-kernel - Re: [PATCH 2/2] pinctrl: baytrail: Serialize all register access

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Message-ID: <CACRpkdbC4uCjuDXRdbKdw1eH2hQV+=r3naysLJM-J-JAGsLX5w@mail.gmail.com>
Date:	Thu, 13 Aug 2015 14:26:49 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] pinctrl: baytrail: Serialize all register access

On Tue, Aug 4, 2015 at 2:03 PM, Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:

> There is a hardware issue in Intel Baytrail where concurrent GPIO register
> access might result reads of 0xffffffff and writes might get dropped
> completely.
>
> Prevent this from happening by taking the serializing lock in all places
> where it is possible that more than one thread might be accessing the
> hardware concurrently.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>

Patch applied.

Same comment here about the fastpath and the RT raw spinlocks.

Yours,
Linus Walleij
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