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

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