linux-kernel - Re: [PATCH v2 2/2] spi: spi-ti-qspi: Use bounce buffer if read buffer is not DMA'ble

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Message-ID: <20170623121221.3zrxziqjuwb47cwq@sirena.org.uk>
Date:   Fri, 23 Jun 2017 13:12:21 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Vignesh R <vigneshr@...com>
Cc:     Cyrille Pitchen <cyrille.pitchen@...el.com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        Richard Weinberger <richard@....at>,
        Boris BREZILLON <boris.brezillon@...e-electrons.com>
Subject: Re: [PATCH v2 2/2] spi: spi-ti-qspi: Use bounce buffer if read
 buffer is not DMA'ble

On Tue, Jun 20, 2017 at 03:15:34PM +0530, Vignesh R wrote:
> On Friday 16 June 2017 09:24 PM, Cyrille Pitchen wrote:

> > Then in a new series, if nobody has started to work on this topic yet,
> > we could propose a generic solution using a bounce buffer at the SPI
> > core level. however we first need to think how we could do this.

> One of the questions that was hovering around when this issue was
> discussed last time around was where should the code to detect whether
> or not to use bounce buffer reside? Some extension to generic DMA APIs
> or SPI drivers or somewhere else?

It seems like it's a generic DMA thing - presumably it's going to be an
issue for other devices as well sometimes.

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