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Date: Tue, 26 Sep 2017 04:02:52 +0800
From: Baolin Wang <baolin.wang@...aro.org>
To: Vinod Koul <vinod.koul@...el.com>
Cc: Baolin Wang <baolin.wang@...eadtrum.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Dan Williams <dan.j.williams@...el.com>,
dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
LKML <linux-kernel@...r.kernel.org>,
Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v3 2/2] dma: sprd: Add Spreadtrum DMA driver
Hi Vinod,
On 25 September 2017 at 17:47, Vinod Koul <vinod.koul@...el.com> wrote:
> On Thu, Sep 07, 2017 at 06:00:04PM +0800, Baolin Wang wrote:
>
>> +static void sprd_dma_chn_update(struct sprd_dma_chn *schan, u32 reg,
>> + u32 mask, u32 val)
>
> right justfied pls
I have made these to right justified, but I do not know why it looks
like in this email. I checked the patch in patchwork[1], it already
right justified. But I will check again to make sure they are right
justified.
[1] https://patchwork.kernel.org/patch/9942025/
>
>> +static void sprd_dma_clear_int(struct sprd_dma_chn *schan)
>> +{
>> + u32 mask = SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET;
>> + u32 val = SPRD_DMA_INT_MASK << SPRD_DMA_INT_CLR_OFFSET;
>
> both seems same..?
Yes, I will save one line here in next version.
>
>> +
>> + sprd_dma_chn_update(schan, SPRD_DMA_CHN_INTC, mask, val);
>
> do you need local values here, we can just call sprd_dma_chn_update() with
> the mask and values!
Sine I want to keep this function to make things clear when users can
know what is going on from the function name. But if you think they
are redundant, I will remove these local values in next version.
>
> Also looking at thus shoulnt SPRD_DMA_INT_MASK bits be defined for the bits
> we have in spec, if so why are we shifting then, perhpas u should redo the
> clear routine to pass mask, shift, bits..?
>
> Same comment for this and others
OK.
>
>> +static enum dma_int_type sprd_dma_get_int_type(struct sprd_dma_chn *schan)
>> +{
>> + u32 intc_sts = readl(schan->chn_base + SPRD_DMA_CHN_INTC) &
>> + SPRD_DMA_CHN_INT_STS;
>
> right justfied
OK.
>
>> +static enum dma_request_mode sprd_dma_get_req_type(struct sprd_dma_chn *schan)
>> +{
>> + u32 frag_reg = readl(schan->chn_base + SPRD_DMA_CHN_FRG_LEN);
>> + u32 req_type = (frag_reg >> SPRD_DMA_REQ_MODE_OFFSET) &
>> + SPRD_DMA_REQ_MODE_MASK;
>> +
>> + switch (req_type) {
>> + case 0:
>> + return SPRD_DMA_FRAG_REQ;
>
> which is 0
>
>> +
>> + case 1:
>> + return SPRD_DMA_BLK_REQ;
>
> and 1 and so on so why the coonversion?
>
> you can do:
>
> switch (req_type) {
> case 0:
> case 1:
> case 2:
> case 3:
> return req_type;
> default:
> return SPRD_DMA_FRAG_REQ;
Make sense.
>
>> +
>> + case 2:
>> + return SPRD_DMA_TRANS_REQ;
>> +
>> + case 3:
>> + return SPRD_DMA_LIST_REQ;
>> +
>> + default:
>> + return SPRD_DMA_FRAG_REQ;
>> + }
>> +}
>> + if ((src_step != 0 && des_step != 0) || (src_step | des_step) == 0) {
>> + fix_en = 0;
>> + } else {
>> + fix_en = 1;
>> + if (src_step)
>> + fix_mode = 1;
>> + else
>> + fix_mode = 0;
>> + }
>> +
>> + hw->frg_len = datawidth << SPRD_DMA_SRC_DATAWIDTH_OFFSET |
>> + datawidth << SPRD_DMA_DES_DATAWIDTH_OFFSET |
>> + req_mode << SPRD_DMA_REQ_MODE_OFFSET |
>> + fix_mode << SPRD_DMA_FIX_SEL_OFFSET |
>> + fix_en << SPRD_DMA_FIX_SEL_EN |
>> + (fragment_len & SPRD_DMA_FRG_LEN_MASK);
>> + hw->blk_len = block_len & SPRD_DMA_BLK_LEN_MASK;
>> +
>> + hw->intc = SPRD_DMA_CFG_ERR_INT_EN;
>
> empty line here please
OK.
>
>> + switch (irq_mode) {
>> + case SPRD_DMA_NO_INT:
>> + break;
>
> no handling?
Yes, we do not need to set any irq type enabled here.
>
>> + case SPRD_DMA_FRAG_INT:
>> + hw->intc |= SPRD_DMA_FRAG_INT_EN;
>> + break;
>
> empty line after break helps readablity
OK. I will check the whole file.
>
>> + case SPRD_DMA_BLK_INT:
>> + hw->intc |= SPRD_DMA_BLK_INT_EN;
>> + break;
>> + case SPRD_DMA_BLK_FRAG_INT:
>> + hw->intc |= SPRD_DMA_BLK_INT_EN | SPRD_DMA_FRAG_INT_EN;
>> + break;
>> + case SPRD_DMA_TRANS_INT:
>> + hw->intc |= SPRD_DMA_TRANS_INT_EN;
>> + break;
>> + case SPRD_DMA_TRANS_FRAG_INT:
>> + hw->intc |= SPRD_DMA_TRANS_INT_EN | SPRD_DMA_FRAG_INT_EN;
>> + break;
>> + case SPRD_DMA_TRANS_BLK_INT:
>> + hw->intc |= SPRD_DMA_TRANS_INT_EN | SPRD_DMA_BLK_INT_EN;
>> + break;
>> + case SPRD_DMA_LIST_INT:
>> + hw->intc |= SPRD_DMA_LIST_INT_EN;
>> + break;
>> + case SPRD_DMA_CFGERR_INT:
>> + hw->intc |= SPRD_DMA_CFG_ERR_INT_EN;
>> + break;
>> + default:
>> + dev_err(sdev->dma_dev.dev, "invalid irq mode\n");
>> + return -EINVAL;
>
> [snip]
>
>> +struct dma_async_tx_descriptor *sprd_dma_prep_dma_memcpy(struct dma_chan *chan,
>> + dma_addr_t dest,
>> + dma_addr_t src,
>> + size_t len,
>> + unsigned long flags)
>> +{
>> + struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
>> + struct sprd_dma_desc *sdesc;
>> + int ret;
>> +
>> + sdesc = kzalloc(sizeof(struct sprd_dma_desc), GFP_NOWAIT);
>
> sizeof(*sdesc) pls
OK.
>
>> + ret = dma_async_device_register(&sdev->dma_dev);
>> + if (ret < 0) {
>> + dev_err(&pdev->dev, "register dma device failed:%d\n", ret);
>> + goto err_register;
>> + }
>> +
>> + sprd_dma_info.dma_cap = sdev->dma_dev.cap_mask;
>> + ret = of_dma_controller_register(np, of_dma_simple_xlate,
>> + &sprd_dma_info);
>> + if (ret)
>> + goto err_of_register;
>> +
>> + pm_runtime_put_sync(&pdev->dev);
>
> why put_sync, i though you didnt want these?
Sorry, I missing this and I will fix this in next version. Thanks for
your commnets.
--
Baolin.wang
Best Regards
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