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

From	Vinod Koul <vinod.koul@intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 2/4] dmaengine: Add STM32 MDMA driver
Date	2017-07-26 07:00 +0200
Message-ID	<u7mAp-49B-1@gated-at.bofh.it> (permalink)
References	(3 earlier) <u5CzF-34w-35@gated-at.bofh.it> <u5CT0-3b5-21@gated-at.bofh.it> <u5DvI-3Ew-17@gated-at.bofh.it> <u5JKN-7DO-3@gated-at.bofh.it> <u6I0i-2Vp-19@gated-at.bofh.it>
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On Mon, Jul 24, 2017 at 09:34:18AM +0000, Pierre Yves MORDRET wrote:
> 
> On 07/21/2017 12:32 PM, Pierre Yves MORDRET wrote:
>  >
>  >
>  > On 07/21/2017 11:54 AM, Vinod Koul wrote:
>  >> On Fri, Jul 21, 2017 at 09:30:00AM +0000, Pierre Yves MORDRET wrote:
>  >>>>> +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
>  >>
>  >> Code is optimized yes, but readable no
>  >>
>  >> I would like readability to be improved upon...
>  >>
>  >
>  > gotcha
>  >
> 
> Doest he code snippet below has a better looking for you ?
> 
> 	for (max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
> 	     max_width > DMA_SLAVE_BUSWIDTH_1_BYTE; max_width >>= 1)
> 		if (((buf_len % max_width) == 0) && (tlen >= max_width))
> 			break;

Am actually not sure :(

Indentation wise it is still a bit messy to follow..

How about:

	for (max_width = DMA_SLAVE_BUSWIDTH_8_BYTES;
			max_width > DMA_SLAVE_BUSWIDTH_1_BYTE;
			max_width >>=1) {
		if (((buf_len % max_width) == 0) && (tlen >= max_width))
			break;
	}

Thanks
-- 
~Vinod

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Re: [PATCH v2 2/4] dmaengine: Add STM32 MDMA driver Vinod Koul <vinod.koul@intel.com> - 2017-07-21 10:00 +0200
  Re: [PATCH v2 2/4] dmaengine: Add STM32 MDMA driver Pierre Yves MORDRET <pierre-yves.mordret@st.com> - 2017-07-21 11:40 +0200
    Re: [PATCH v2 2/4] dmaengine: Add STM32 MDMA driver Vinod Koul <vinod.koul@intel.com> - 2017-07-21 12:00 +0200
      Re: [PATCH v2 2/4] dmaengine: Add STM32 MDMA driver Pierre Yves MORDRET <pierre-yves.mordret@st.com> - 2017-07-21 12:40 +0200
        Re: [PATCH v2 2/4] dmaengine: Add STM32 MDMA driver Vinod Koul <vinod.koul@intel.com> - 2017-07-21 19:20 +0200
          Re: [PATCH v2 2/4] dmaengine: Add STM32 MDMA driver Pierre Yves MORDRET <pierre-yves.mordret@st.com> - 2017-07-24 11:40 +0200
            Re: [PATCH v2 2/4] dmaengine: Add STM32 MDMA driver Vinod Koul <vinod.koul@intel.com> - 2017-07-26 07:00 +0200

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