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


Le lun. 9 juil. 2018 à 19:10, Vinod <vkoul@kernel.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

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