linux-kernel - Re: [PATCH v2] ARM: EDMA: Fix clearing of unused list for DT DMA resources

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Date:	Fri, 06 Sep 2013 20:15:27 +0100
From:	Mark Jackson <mpfj-list@...flow.co.uk>
To:	Joel Fernandes <joelf@...com>
CC:	Sekhar Nori <nsekhar@...com>, Tony Lindgren <tony@...mide.com>,
	Matt Porter <matt@...orter.com>,
	Vinod Koul <vinod.koul@...el.com>, Dan Williams <djbw@...com>,
	Russell King <linux@....linux.org.uk>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Pantel Antoniou <panto@...oniou-consulting.com>
Subject: Re: [PATCH v2] ARM: EDMA: Fix clearing of unused list for DT DMA
 resources

On 06/09/13 20:13, Mark Jackson wrote:
> On 23/08/13 20:53, Joel Fernandes wrote:
>> HWMOD removal for MMC and Crypto is breaking edma_start as the events are
>> being manually triggered due to unused channel list not being clear. Atleast
>> breakage has been seen on these peripherals, but it is expected Audio (McASP)
>> maybe breaking too.
>>
>> This patch fixes the issue, by reading the "dmas" property from the DT node if
>> it exists and clearing the bits in the unused channel list so that these channels
>> are not manually triggered.
>>
>> v2 changes:
>> Reduced indendation by returning from if block.
>>
>> Reviewed-by: Sekhar Nori <nsekhar@...com>
>> Reported-by: Balaji T K <balajitk@...com>
>> Cc: Pantel Antoniou <panto@...oniou-consulting.com>
>> Signed-off-by: Joel Fernandes <joelf@...com>
>> ---
>> Note:
>> Patch should go in for -rc cycle as it fixes existing crypto drivers.
>>
>>  arch/arm/common/edma.c | 22 +++++++++++++++++++---
>>  1 file changed, 19 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c
>> index 39ad030..3867e7e 100644
>> --- a/arch/arm/common/edma.c
>> +++ b/arch/arm/common/edma.c
>> @@ -560,14 +560,30 @@ static int reserve_contiguous_slots(int ctlr, unsigned int id,
>>  static int prepare_unused_channel_list(struct device *dev, void *data)
>>  {
>>  	struct platform_device *pdev = to_platform_device(dev);
>> -	int i, ctlr;
>> +	int i = 0, ctlr;
>> +	u32 dma_chan;
>> +	const __be32 *dma_chan_p;
>> +	struct property *prop;
>> +
>> +	if (dev->of_node) {
>> +		of_property_for_each_u32(dev->of_node, "dmas", prop,
>> +					 dma_chan_p, dma_chan) {
>> +			if (i++ & 1) {
>> +				ctlr = EDMA_CTLR(dma_chan);
>> +				clear_bit(EDMA_CHAN_SLOT(dma_chan),
>> +					  edma_cc[ctlr]->edma_unused);
>> +			}
>> +		}
>> +		return;
> 
> This should return something here, otherwise we get:-
> 
> arch/arm/common/edma.c: In function 'prepare_unused_channel_list':
> arch/arm/common/edma.c:577:3: warning: 'return' with no value, in function returning non-void [-Wreturn-type]

Other than that I can confirm it fixes the issue for me ...

Tested-by: Mark Jackson <mpfj@...flow.co.uk>

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