linux-kernel - Re: [PATCH v3 2/3] mtd: nand: mxc_nand: implement exec

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Date: Thu, 16 May 2024 15:05:24 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Richard Weinberger <richard@....at>, Vignesh Raghavendra
 <vigneshr@...com>, linux-mtd@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] mtd: nand: mxc_nand: implement exec_op

Hi Sascha,

s.hauer@...gutronix.de wrote on Thu, 16 May 2024 13:36:42 +0200:

> On Thu, May 16, 2024 at 12:44:05PM +0200, Miquel Raynal wrote:
> > Hi Sascha,
> > 
> > s.hauer@...gutronix.de wrote on Thu, 16 May 2024 12:25:43 +0200:
> >   
> > > On Thu, May 16, 2024 at 10:32:14AM +0200, Miquel Raynal wrote:  
> > > > Hi Sascha,
> > > >     
> > > > > +static const struct nand_op_parser mxcnd_op_parser = NAND_OP_PARSER(
> > > > > +	NAND_OP_PARSER_PATTERN(mxcnd_do_exec_op,
> > > > > +			       NAND_OP_PARSER_PAT_CMD_ELEM(false),
> > > > > +			       NAND_OP_PARSER_PAT_ADDR_ELEM(true, 7),
> > > > > +			       NAND_OP_PARSER_PAT_CMD_ELEM(true),
> > > > > +			       NAND_OP_PARSER_PAT_WAITRDY_ELEM(true),
> > > > > +			       NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, MAX_DATA_SIZE)),    
> > > > 
> > > > CMD, ADDR, CMD, DATA is the RNDOUT pattern. So it is now working fine?    
> > > 
> > > Yes, RNDOUT is working now.  
> > 
> > Excellent!
> >   
> > > > Or did you forget to adapt the patterns to your use case?    
> > > 
> > > Although it looks like the patterns from the pl35x-nand-controller.c,
> > > there is one slight difference. The 'false' in the NAND_OP_PARSER_PAT_CMD_ELEM
> > > above has the effect that a plain NAND_OP_PARSER_PAT_DATA_IN_ELEM is
> > > disallowed.  
> > 
> > I'm not sure I follow, the above pattern means: a single command cycle
> > is supported, no?  
> 
> A single command cycle indeed is and shall be supported. The
> pl35x-nand-controller.c I copied this from has
> NAND_OP_PARSER_PAT_CMD_ELEM(true). With all elements being optional this
> also allows a single NAND_OP_PARSER_PAT_DATA_IN_ELEM()
> (supported_op.data_only_read becomes true). I can't support that, so I
> made the CMD mandatory.

Alright, yeah. Ack.

Thanks,
Miquèl