linux-kernel - Re: [PATCH v3 2/2] dmaengine: apple-sio: Add Apple SIO driver

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Date:   Mon, 16 Oct 2023 12:41:20 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Martin Povišer <povik+lin@...ebit.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, asahi@...ts.linux.dev,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] dmaengine: apple-sio: Add Apple SIO driver

On 13-10-23, 18:49, Martin Povišer wrote:

> +static struct dma_async_tx_descriptor *sio_prep_dma_cyclic(

this should generate a check warning, typically lines should not end with a '('

> +		struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
> +		size_t period_len, enum dma_transfer_direction direction,
> +		unsigned long flags)

also helps to align with the open brace to something like:
static struct dma_async_tx_descriptor *
sio_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
                    size_t period_len, enum dma_transfer_direction direction,
                    unsigned long flags)

> +static bool sio_fill_in_locked(struct sio_chan *siochan);
> +
> +static void sio_handle_issue_ack(struct sio_chan *siochan, void *cookie, bool ok)
> +{
> +	dma_cookie_t tx_cookie = (unsigned long) cookie;

space not required after a cast

> +static struct dma_chan *sio_dma_of_xlate(struct of_phandle_args *dma_spec,
> +					 struct of_dma *ofdma)
> +{
> +	struct sio_data *sio = (struct sio_data *) ofdma->of_dma_data;

drop space after cast here too

> +static int sio_device_config(struct dma_chan *chan,
> +			     struct dma_slave_config *config)
> +{
> +	struct sio_chan *siochan = to_sio_chan(chan);
> +	struct sio_data *sio = siochan->host;
> +	bool is_tx = sio_chan_direction(siochan->no) == DMA_MEM_TO_DEV;
> +	struct sio_shmem_chan_config *cfg_shmem = sio->shmem;
> +	struct sio_shmem_chan_config cfg;
> +	int ret;
> +
> +	switch (is_tx ? config->dst_addr_width : config->src_addr_width) {
> +	case DMA_SLAVE_BUSWIDTH_1_BYTE:
> +		cfg.datashape = 0;
> +		break;
> +	case DMA_SLAVE_BUSWIDTH_2_BYTES:
> +		cfg.datashape = 1;
> +		break;
> +	case DMA_SLAVE_BUSWIDTH_4_BYTES:
> +		cfg.datashape = 2;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	cfg.fifo = 0x800;
> +	cfg.limit = 0x800;
> +	cfg.threshold = 0x800;

what do these values represent, should this not be passed by the client

> +static int sio_alloc_shmem(struct sio_data *sio)
> +{
> +	dma_addr_t iova;
> +	int err;
> +
> +	sio->shmem = dma_alloc_coherent(sio->dev, SIO_SHMEM_SIZE,
> +					&iova, GFP_KERNEL);
> +	if (!sio->shmem)
> +		return -ENOMEM;
> +
> +	sio->shmem_desc_base = (struct sio_coproc_desc *) (sio->shmem + 56);

here too

> +static int sio_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np = pdev->dev.of_node;
> +	struct sio_data *sio;
> +	struct dma_device *dma;
> +	int nchannels;
> +	int err, i;
> +
> +	err = of_property_read_u32(np, "dma-channels", &nchannels);

why not use device_property_read_u32()
-- 
~Vinod