linux-kernel - Re: [PATCH 1/3] mtd: nand: pxa3xx_nand: add register access debug

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Message-ID: <20150818042426.GA27858@laptop>
Date:	Tue, 18 Aug 2015 01:24:26 -0300
From:	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] mtd: nand: pxa3xx_nand: add register access debug

On 11 Aug 09:57 PM, Robert Jarzmik wrote:
> Add verbose debug for register accesses. This enables easier debugging
> by following where and how hardware is stimulated, and how it answers.
> 

I really don't see why we want this patch. It's probably an useful hack to
use in some cases, but can't see why we would want it in mainline.

Feel free to prove me wrong.

> Signed-off-by: Robert Jarzmik <robert.jarzmik@...e.fr>
> ---
>  drivers/mtd/nand/pxa3xx_nand.c | 22 +++++++++++++++++-----
>  1 file changed, 17 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
> index 1259cc558ce9..ed44bddcc43f 100644
> --- a/drivers/mtd/nand/pxa3xx_nand.c
> +++ b/drivers/mtd/nand/pxa3xx_nand.c
> @@ -127,11 +127,23 @@
>  #define EXT_CMD_TYPE_MONO	0 /* Monolithic read/write */
>  
>  /* macros for registers read/write */
> -#define nand_writel(info, off, val)	\
> -	writel_relaxed((val), (info)->mmio_base + (off))
> -
> -#define nand_readl(info, off)		\
> -	readl_relaxed((info)->mmio_base + (off))
> +#define nand_writel(info, off, val)					\
> +	do {								\
> +		dev_vdbg(&info->pdev->dev,				\
> +			 "%s():%d nand_writel(0x%x, %s)\n",		\
> +			 __func__, __LINE__, (val), #off);		\
> +		writel_relaxed((val), (info)->mmio_base + (off));	\
> +	} while (0)
> +
> +#define nand_readl(info, off)						\
> +	({								\
> +		unsigned int _v;					\
> +		_v = readl_relaxed((info)->mmio_base + (off));		\
> +		dev_vdbg(&info->pdev->dev,				\
> +			 "%s():%d nand_readl(%s): 0x%x\n",		\
> +			 __func__, __LINE__, #off, _v);			\
> +		_v;							\
> +	})
>  
>  /* error code and state */
>  enum {
> -- 
> 2.1.4
> 
> 
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/

-- 
Ezequiel Garcia, VanguardiaSur
www.vanguardiasur.com.ar
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