linux-kernel - Re: [PATCH] mtd: nand: raw: atmel: Fix comment in timings preparation

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Date: Mon, 26 Feb 2024 13:54:58 +0100
From: Nicolas Ferre <nicolas.ferre@...rochip.com>
To: Alexander Dahl <ada@...rsis.com>, <linux-kernel@...r.kernel.org>
CC: Boris Brezillon <bbrezillon@...nel.org>, Tudor Ambarus
	<tudor.ambarus@...aro.org>, Miquel Raynal <miquel.raynal@...tlin.com>,
	Vignesh Raghavendra <vigneshr@...com>, <linux-mtd@...ts.infradead.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] mtd: nand: raw: atmel: Fix comment in timings preparation

On 26/02/2024 at 13:25, Alexander Dahl wrote:
> Looks like a copy'n'paste mistake introduced when initially adding the
> dynamic timings feature with commit f9ce2eddf176 ("mtd: nand: atmel: Add
> ->setup_data_interface() hooks").  The context around this and
> especially the code itself suggests 'read' is meant instead of write.
> 
> Signed-off-by: Alexander Dahl <ada@...rsis.com>

Looks indeed valid:
Reviewed-by: Nicolas Ferre <nicolas.ferre@...rochip.com>

Thanks Alexander. Best regards,
   Nicolas

> ---
>   drivers/mtd/nand/raw/atmel/nand-controller.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
> index 4cb478bbee4a..dc75d50d52e8 100644
> --- a/drivers/mtd/nand/raw/atmel/nand-controller.c
> +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
> @@ -1370,23 +1370,23 @@ static int atmel_smc_nand_prepare_smcconf(struct atmel_nand *nand,
>           *
>           * NRD_PULSE = tRP
>           */
>          ncycles = DIV_ROUND_UP(conf->timings.sdr.tRP_min, mckperiodps);
>          totalcycles += ncycles;
>          ret = atmel_smc_cs_conf_set_pulse(smcconf, ATMEL_SMC_NRD_SHIFT,
>                                            ncycles);
>          if (ret)
>                  return ret;
> 
>          /*
> -        * The write cycle timing is directly matching tWC, but is also
> +        * The read cycle timing is directly matching tRC, but is also
>           * dependent on the setup and hold timings we calculated earlier,
>           * which gives:
>           *
>           * NRD_CYCLE = max(tRC, NRD_PULSE + NRD_HOLD)
>           *
>           * NRD_SETUP is always 0.
>           */
>          ncycles = DIV_ROUND_UP(conf->timings.sdr.tRC_min, mckperiodps);
>          ncycles = max(totalcycles, ncycles);
>          ret = atmel_smc_cs_conf_set_cycle(smcconf, ATMEL_SMC_NRD_SHIFT,
>                                            ncycles);
> 
> base-commit: d206a76d7d2726f3b096037f2079ce0bd3ba329b
> --
> 2.39.2
>