linux-kernel - Re: [PATCH] mmc: mmci: Allow MMCI to request channels with information acquired from DT

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Date:	Tue, 30 Apr 2013 15:01:56 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	Russell King <linux@....linux.org.uk>,
	Chris Ball <cjb@...top.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH] mmc: mmci: Allow MMCI to request channels with
 information acquired from DT

On Wed, Apr 24, 2013 at 12:58 PM, Lee Jones <lee.jones@...aro.org> wrote:

> Currently, if DMA information isn't passed from platform data, then DMA
> will not be used. This patch allows DMA information obtained though Device
> Tree to be used as well.
>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Chris Ball <cjb@...top.org>
> Cc: linux-mmc@...r.kernel.org
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
(...)

I tried to test this patch, but:
  CC      drivers/mmc/host/mmci.o
/drivers/mmc/host/mmci.c: In function 'mmci_dma_setup':
/drivers/mmc/host/mmci.c:307:51: error: 'dev' undeclared (first use in
this function)
/drivers/mmc/host/mmci.c:307:51: note: each undeclared identifier is
reported only once for each function it appears in
make[5]: *** [drivers/mmc/host/mmci.o] Error 1
make[4]: *** [drivers/mmc/host] Error 2
make[3]: *** [drivers/mmc] Error 2

Due to:

> @@ -304,10 +304,8 @@ static void mmci_dma_setup(struct mmci_host *host)
>         const char *rxname, *txname;
>         dma_cap_mask_t mask;
>
> -       if (!plat || !plat->dma_filter) {
> -               dev_info(mmc_dev(host->mmc), "no DMA platform data\n");
> -               return;
> -       }
> +       host->dma_rx_channel = dma_request_slave_channel(dev, "rx");
> +       host->dma_tx_channel = dma_request_slave_channel(dev, "tx");

There is no "dev" here.

Yours,
Linus Walleij
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