linux-kernel - Re: [PATCH] dw_dmac: apply default dma

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Date:	Tue, 12 Feb 2013 18:53:22 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.jf.intel.com>,
	linux-kernel@...r.kernel.org,
	spear-devel <spear-devel@...t.st.com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH] dw_dmac: apply default dma_mask if needed

On Tue, Feb 12, 2013 at 6:16 PM, Vinod Koul <vinod.koul@...el.com> wrote:
> On Tue, Jan 29, 2013 at 05:06:24PM +0200, Andy Shevchenko wrote:
>> In some cases we got the device without dma_mask configured. We have to apply
>> the default value to avoid crashes during memory mapping.
>>
> what was this generated against, it fails to apply for me.

I've tested this against linux-next. The problem apparently in the
patch which Greg submits earlier:
7331205a "dma: Convert to devm_ioremap_resource()". If you want I
could rebase it against your next branch. I thought you'd seen that
patch already.

>
>> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>> ---
>>  drivers/dma/dw_dmac.c |    6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
>> index e8d0679..a572a1e 100644
>> --- a/drivers/dma/dw_dmac.c
>> +++ b/drivers/dma/dw_dmac.c
>> @@ -1673,6 +1673,12 @@ static int dw_probe(struct platform_device *pdev)
>>       if (IS_ERR(regs))
>>               return PTR_ERR(regs);
>>
>> +     /* Apply default dma_mask if needed */
>> +     if (!pdev->dev.dma_mask) {
>> +             pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
>> +             pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
>> +     }
>> +
>>       dw_params = dma_read_byaddr(regs, DW_PARAMS);
>>       autocfg = dw_params >> DW_PARAMS_EN & 0x1;
>>
>> --
>> 1.7.10.4
>>
> --
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-- 
With Best Regards,
Andy Shevchenko
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