linux-kernel - Re: [PATCH v3 1/9] mtd: spi-nor: improve macronix_quad

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Message-ID: <32ea0535-97a6-34d6-7263-24f155d3da62@denx.de>
Date:   Tue, 25 Oct 2016 16:49:04 +0200
From:   Marek Vasut <marex@...x.de>
To:     Cyrille Pitchen <cyrille.pitchen@...el.com>,
        computersforpeace@...il.com, linux-mtd@...ts.infradead.org
Cc:     nicolas.ferre@...el.com, boris.brezillon@...e-electrons.com,
        richard@....at, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/9] mtd: spi-nor: improve macronix_quad_enable()

On 10/25/2016 10:52 AM, Cyrille Pitchen wrote:
> Hi Marek,
> 
> Le 25/10/2016 à 00:00, Marek Vasut a écrit :
>> On 10/24/2016 06:34 PM, Cyrille Pitchen wrote:
>>> The patch checks whether the Quad Enable bit is already set in the Status
>>> Register. If so, the function exits immediately with a successful return
>>> code. Otherwise, a message is now printed telling we're setting the
>>> non-volatile bit.
>>>
>>> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>
>>> Reviewed-by: Jagan Teki <jagan@...nedev.com>
>>> ---
>>>  drivers/mtd/spi-nor/spi-nor.c | 5 +++++
>>>  1 file changed, 5 insertions(+)
>>>
>>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>>> index d0fc165d7d66..5c87b2d99507 100644
>>> --- a/drivers/mtd/spi-nor/spi-nor.c
>>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>>> @@ -1211,6 +1211,11 @@ static int macronix_quad_enable(struct spi_nor *nor)
>>>  	val = read_sr(nor);
>>>  	if (val < 0)
>>>  		return val;
>>> +	if (val & SR_QUAD_EN_MX)
>>> +		return 0;
>>> +
>>> +	/* Update the Quad Enable bit. */
>>> +	dev_info(nor->dev, "setting Macronix Quad Enable (non-volatile) bit\n");
>>
>> Should probably be dev_dbg(), since this is just churn in the kernel
>> log. The user doesn't care and the developer can just up the debug level
>> or add his own printk .
>>
> 
> The Quad Enable bit is non-volatile so this trace should be printed only once
> but I'm perfectly fine with using dev_dbg(). I'll change it in the next version.

I get it, but what's the value of it ? Who will make use of this
information being in the kernel log? The kernel is already chatty enough :)

-- 
Best regards,
Marek Vasut