linux-kernel - RE: [PATCH v1 RFC 1/2] spi: introduce fallback to pio

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Message-ID: <VE1PR04MB6638793C00742D5BA72F8AC2899C0@VE1PR04MB6638.eurprd04.prod.outlook.com>
Date:   Mon, 15 Jun 2020 14:18:54 +0000
From:   Robin Gong <yibin.gong@....com>
To:     Mark Brown <broonie@...nel.org>
CC:     Vinod Koul <vkoul@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "matthias.schiffer@...tq-group.com" 
        <matthias.schiffer@...tq-group.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1 RFC 1/2] spi: introduce fallback to pio

On 2020/06/15 21:39 Mark Brown <broonie@...nel.org> wrote:
> On Mon, Jun 15, 2020 at 01:35:01PM +0000, Robin Gong wrote:
> > Then how about choosing specific error code for such dma not ready
> > case where nothing went out on the bus neither?
> 
> Yes, that's what I suggested.
Seems not easy to find a suitable error value, how about EBADR which
sounds like no any available dma_async_tx_descriptor got by calling dmaengine_prep_slave_sg? 
#define EBADR           53      /* Invalid request descriptor */