linux-kernel - Re: [PATCH 04/14] dmaengine: dma-jz4780: Add support for the JZ4770 SoC

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Date:   Tue, 10 Jul 2018 17:41:26 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Vinod <vkoul@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>,
        Mathieu Malaterre <malat@...ian.org>,
        Daniel Silsby <dansilsby@...il.com>, dmaengine@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mips@...ux-mips.org
Subject: Re: [PATCH 04/14] dmaengine: dma-jz4780: Add support for the JZ4770
 SoC



Le lun. 9 juil. 2018 à 19:10, Vinod <vkoul@...nel.org> a écrit :
> On 03-07-18, 14:32, Paul Cercueil wrote:
> 
>>  +static inline void jz4780_dma_chan_disable(struct jz4780_dma_dev 
>> *jzdma,
>>  +	unsigned int chn)
>>  +{
>>  +	if (jzdma->version == ID_JZ4770)
>>  +		jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKEC, BIT(chn));
>>  +}
> 
> this sounds as hardware behaviour, so why not describe as a property 
> in
> DT?

See my response to your message on patch 1.

>>  +
>>   static struct jz4780_dma_desc *jz4780_dma_desc_alloc(
>>   	struct jz4780_dma_chan *jzchan, unsigned int count,
>>   	enum dma_transaction_type type)
>>  @@ -228,8 +246,15 @@ static void jz4780_dma_desc_free(struct 
>> virt_dma_desc *vdesc)
>>   	kfree(desc);
>>   }
>> 
>>  -static uint32_t jz4780_dma_transfer_size(unsigned long val, 
>> uint32_t *shift)
>>  +static const unsigned int jz4780_dma_ord_max[] = {
>>  +	[ID_JZ4770] = 6,
>>  +	[ID_JZ4780] = 7,
>>  +};
> 
> So this gives the transfer length supported?

Yes, exactly. The maximum transfer size is (1 << ord).

> --
> ~Vinod