linux-kernel - Re: [PATCH V2] Add support for flag status register on Micron chips.

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Message-ID: <CA+iBjpSHL0+A=wzhhVvT_y+mhZoFNLUkNe18OtxPn1hZVCdUDw@mail.gmail.com>
Date:	Mon, 14 Apr 2014 11:19:24 -0500
From:	Graham Moore <ggrahammoore@...il.com>
To:	Marek Vasut <marex@...x.de>
Cc:	"grmoore@...era.com" <grmoore@...era.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
	Sourav Poddar <sourav.poddar@...com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Geert Uytterhoeven <geert+renesas@...ux-m68k.org>,
	Jingoo Han <jg1.han@...sung.com>,
	Insop Song <insop.song@...nspeed.com>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Alan Tull <atull@...era.com>,
	Dinh Nguyen <dinguyen@...era.com>,
	Yves Vandervennet <rocket.yvanderv@...il.com>
Subject: Re: [PATCH V2] Add support for flag status register on Micron chips.

On Sun, Apr 13, 2014 at 12:18 PM, Marek Vasut <marex@...x.de> wrote:
[...]
>> +#define      OPCODE_RDFSR            0x70  /* read flag status register */
>
> I know this is not your fault, but can you please indent this properly with
> tabs?
>
>>  #define      OPCODE_NORM_READ        0x03    /* Read data bytes (low
> frequency) */
>>  #define      OPCODE_FAST_READ        0x0b    /* Read data bytes (high
> frequency) */
>>  #define      OPCODE_QUAD_READ        0x6b    /* Read data bytes */
>
> And fix this one in a separate patch to use tabs as well please ?

I'm rebasing on l2-mtd spinor, and the tabs are jacked up there too.
I'll fix the
one I added, and fix other tabs in a new patch on that branch.

[...]
> I wonder, can't wait_till_ready() be made a wrapper that will check the USE_FSR
> flag and call correct wait-function ? This would avoid adding a new member to
> *flash and also would avoid so many changes throughout the code. What do you
> think?

Yeah, that's kind of ugly, but the flags exist only in the static
m25p_ids[] and are only
used in the scan/init.  I'd have to add a new member to save them for
later use.
And then other uses would crop up.  So, seemed kinda iffy either way.

It's going to change anyway, because l2-mtd spinor branch has refactored
wait_till_ready() such that it uses a function pointer from the new
spi_nor struct.
I'm still mulling it over :)

Thanks,
-Graham
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