From: Paul Cercueil <paul@crapouillou.net>
To: Vinod <vkoul@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Ralf Baechle <ralf@linux-mips.org>,
Paul Burton <paul.burton@mips.com>,
James Hogan <jhogan@kernel.org>,
Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>,
Mathieu Malaterre <malat@debian.org>,
Daniel Silsby <dansilsby@gmail.com>,
dmaengine@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mips@linux-mips.org
Subject: [04/14] dmaengine: dma-jz4780: Add support for the JZ4770 SoC
Date: Tue, 10 Jul 2018 17:41:26 +0200 [thread overview]
Message-ID: <1531237286.17118.2@crapouillou.net> (raw)
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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next reply other threads:[~2018-07-10 15:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-10 15:41 Paul Cercueil [this message]
-- strict thread matches above, loose matches on Subject: below --
2018-07-09 17:10 [04/14] dmaengine: dma-jz4780: Add support for the JZ4770 SoC Vinod Koul
2018-07-03 12:32 Paul Cercueil
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