linux-kernel - Re: [PATCH] dmaengine: jz4780: Set max number of SGs per burst

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Message-Id: <TNGT0R.X6IU8OUDO4HW2@crapouillou.net>
Date:   Mon, 11 Oct 2021 16:09:29 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Artur Rojek <contact@...ur-rojek.eu>
Cc:     Vinod Koul <vkoul@...nel.org>, linux-mips@...r.kernel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: jz4780: Set max number of SGs per burst

Hi Vinod,

Le lun., août 30 2021 at 10:48:52 +0100, Paul Cercueil 
<paul@...pouillou.net> a écrit :
> Hi,
> 
> Le dim., août 29 2021 at 21:58:05 +0200, Artur Rojek 
> <contact@...ur-rojek.eu> a écrit :
>> Total amount of SG list entries executed in a single burst is 
>> limited by
>> the number of available DMA descriptors.
>> This information is useful for device drivers utilizing this DMA 
>> engine.
>> 
>> Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
> 
> Acked-by: Paul Cercueil <paul@...pouillou.net>

Feedback on this?

Cheers,
-Paul

>> ---
>>  drivers/dma/dma-jz4780.c | 1 +
>>  1 file changed, 1 insertion(+)
>> 
>> diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
>> index ebee94dbd630..96701dedcac8 100644
>> --- a/drivers/dma/dma-jz4780.c
>> +++ b/drivers/dma/dma-jz4780.c
>> @@ -915,6 +915,7 @@ static int jz4780_dma_probe(struct 
>> platform_device *pdev)
>>  	dd->dst_addr_widths = JZ_DMA_BUSWIDTHS;
>>  	dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
>>  	dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
>> +	dd->max_sg_burst = JZ_DMA_MAX_DESC;
>> 
>>  	/*
>>  	 * Enable DMA controller, mark all channels as not programmable.
>> --
>> 2.33.0
>> 
>