Thread (15 messages) 15 messages, 3 authors, 2017-07-26

Re: [PATCH v2 2/4] dmaengine: Add STM32 MDMA driver

From: Pierre Yves MORDRET <hidden>
Date: 2017-07-21 09:30:57
Also in: linux-arm-kernel, lkml



On 07/21/2017 09:55 AM, Vinod Koul wrote:
> On Thu, Jul 06, 2017 at 02:25:39PM +0200, Pierre-Yves MORDRET wrote:
> 
>> +config STM32_MDMA
>> +	bool "STMicroelectronics STM32 master dma support"
>> +	depends on ARCH_STM32  || COMPILE_TEST
> 			    ^^^
> why multiple spaces

typo I guess

> 
>> +static enum dma_slave_buswidth stm32_mdma_get_max_width(u32 buf_len, u32 tlen)
>> +{
>> +	enum dma_slave_buswidth max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
>> +
>> +	while (((buf_len % max_width) || (tlen < max_width)) &&
>> +	       (max_width > DMA_SLAVE_BUSWIDTH_1_BYTE))
>> +		max_width = max_width >> 1;
> 
> ok, this is a bit hard to read...

This code snippet has already been reworked and optimized. Would you mind to 
provide me a example with your expectation ? Thanks

> 
>> +static int stm32_mdma_set_xfer_param(struct stm32_mdma_chan *chan,
>> +				     enum dma_transfer_direction direction,
>> +				     u32 *mdma_ccr, u32 *mdma_ctcr,
>> +				     u32 *mdma_ctbr, u32 buf_len)
>> +{
>> +	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
>> +	struct stm32_mdma_chan_config *chan_config = &chan->chan_config;
>> +	enum dma_slave_buswidth src_addr_width, dst_addr_width;
>> +	phys_addr_t src_addr, dst_addr;
>> +	int src_bus_width, dst_bus_width;
>> +	u32 src_maxburst, dst_maxburst, src_best_burst, dst_best_burst;
>> +	u32 ccr, ctcr, ctbr, tlen;
>> +
>> +	src_addr_width = chan->dma_config.src_addr_width;
>> +	dst_addr_width = chan->dma_config.dst_addr_width;
>> +	src_maxburst = chan->dma_config.src_maxburst;
>> +	dst_maxburst = chan->dma_config.dst_maxburst;
>> +	src_addr = chan->dma_config.src_addr;
>> +	dst_addr = chan->dma_config.dst_addr;
> 
> this doesn't seem right to me, only the periphral address would come from
> slave_config, the memory address is passed as an arg to transfer..
> 
> ...
> 

Correct. But these locals are managed in the case statement below. if direction 
is Mem2Dev only dst_addr(Peripheral) is considered. In the other way around with 
Dev2Mem direction only src_addr(Peripheral) is considered.
However to disambiguate I can move src_addr & dst_addr affectation in the 
corresponding case statement if you'd like.

>> +static int stm32_mdma_setup_xfer(struct stm32_mdma_chan *chan,
>> +				 struct stm32_mdma_desc *desc,
>> +				 struct scatterlist *sgl, u32 sg_len,
>> +				 enum dma_transfer_direction direction)
>> +{
>> +	struct stm32_mdma_device *dmadev = stm32_mdma_get_dev(chan);
>> +	struct dma_slave_config *dma_config = &chan->dma_config;
>> +	struct scatterlist *sg;
>> +	dma_addr_t src_addr, dst_addr;
>> +	u32 ccr, ctcr, ctbr;
>> +	int i, ret = 0;
>> +
>> +	for_each_sg(sgl, sg, sg_len, i) {
>> +		if (sg_dma_len(sg) > STM32_MDMA_MAX_BLOCK_LEN) {
>> +			dev_err(chan2dev(chan), "Invalid block len\n");
>> +			return -EINVAL;
>> +		}
>> +
>> +		ret = stm32_mdma_set_xfer_param(chan, direction, &ccr, &ctcr,
>> +						&ctbr, sg_dma_len(sg));
>> +		if (ret < 0)
>> +			return ret;
>> +
>> +		if (direction == DMA_MEM_TO_DEV) {
>> +			src_addr = sg_dma_address(sg);
>> +			dst_addr = dma_config->dst_addr;
> 
> and this seems correct, but then why are we doing it in
> stm32_mdma_set_xfer_param()
> 

See comment above.

>> +static struct dma_async_tx_descriptor *stm32_mdma_prep_slave_sg(
>> +	struct dma_chan *c, struct scatterlist *sgl,
>> +	u32 sg_len, enum dma_transfer_direction direction,
>> +	unsigned long flags, void *context)
> 
> right justfied these please, it makes a terrible read
> 

Given the amount of parameters difficult to right align.
Agree with this formatting ?

static struct dma_async_tx_descriptor
*stm32_mdma_prep_slave_sg(struct dma_chan *c, struct scatterlist *sgl,
			  u32 sg_len, enum dma_transfer_direction direction,
			  unsigned long flags, void *context)

>> +{
>> +	struct stm32_mdma_chan *chan = to_stm32_mdma_chan(c);
>> +	struct stm32_mdma_desc *desc;
>> +	int ret;
>> +
>> +	desc = stm32_mdma_alloc_desc(chan, sg_len);
>> +	if (!desc)
>> +		return NULL;
>> +
>> +	ret = stm32_mdma_setup_xfer(chan, desc, sgl, sg_len, direction);
>> +	if (ret < 0)
>> +		goto xfer_setup_err;
>> +
>> +	desc->cyclic = false;
>> +
>> +	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
>> +
>> +xfer_setup_err:
>> +	dma_pool_free(chan->desc_pool, &desc->hwdesc, desc->hwdesc_phys);
>> +	kfree(desc);
>> +	return NULL;
>> +}
>> +
>> +static struct dma_async_tx_descriptor *stm32_mdma_prep_dma_cyclic(
>> +	struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len,
>> +	size_t period_len, enum dma_transfer_direction direction,
>> +	unsigned long flags)
> 
> here too and few other places

ok. See comment above.

> 
>> +static int stm32_mdma_probe(struct platform_device *pdev)
>> +{
>> +	struct stm32_mdma_chan *chan;
>> +	struct stm32_mdma_device *dmadev;
>> +	struct dma_device *dd;
>> +	struct device_node *of_node;
>> +	struct resource *res;
>> +	u32 nr_channels, nr_requests;
>> +	int i, count, ret;
>> +
>> +	of_node = pdev->dev.of_node;
>> +	if (!of_node)
>> +		return -ENODEV;
>> +
>> +	ret = of_property_read_u32(of_node, "dma-channels", &nr_channels);
>> +	if (ret)
>> +		nr_channels = STM32_MDMA_MAX_CHANNELS;
>> +
>> +	ret = of_property_read_u32(of_node, "dma-requests", &nr_requests);
>> +	if (ret)
>> +		nr_requests = STM32_MDMA_MAX_REQUESTS;
> 
> wouldn't it make sense to print error about these properties not being
> present and continuing w/ defaults..?

Those are optional parameters as stated by bindings. I can print out a warning 
or info if you'd like but not error.

> 
> and can we have device_property_xxx instead of of_ variants?
> 

of course !

>> +static int __init stm32_mdma_init(void)
>> +{
>> +	return platform_driver_probe(&stm32_mdma_driver, stm32_mdma_probe);
>> +}
>> +
>> +subsys_initcall(stm32_mdma_init);
> 
> Where are the MODULE_xx tags, license is mandatory. You should add author
> too.
>   
> 

Correct. I will change the Header at the same time.

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