Re: [PATCH v1 3/5] mtd: nand: raw: rockchip-nand-controller: fix nand timing default

[Miquel Raynal <miquel.raynal@bootlin.com>]

Hi Johan,

jbx6244@gmail.com wrote on Thu, 8 Jun 2023 18:30:40 +0200:

> Somehow not all NAND chips give a valid timing setting with the
> nand_get_sdr_timings() function.

nand_get_sdr_timings() is a core function and is not particularly
clever. All chips are supposed to support SDR mode 0 so if you chip
does not advertises that the chip is broken, not the controller. This
must be fixed in the chip manufacturer driver, not in the controller
driver.

> Don't consider it as an error,
> but fall back to the default value in order to continue to use
> the driver.
> 
> Signed-off-by: Johan Jonker <jbx6244@gmail.com>
> ---
>  drivers/mtd/nand/raw/rockchip-nand-controller.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/rockchip-nand-controller.c b/drivers/mtd/nand/raw/rockchip-nand-controller.c
> index f56430f6c..e39431cfa 100644
> --- a/drivers/mtd/nand/raw/rockchip-nand-controller.c
> +++ b/drivers/mtd/nand/raw/rockchip-nand-controller.c
> @@ -429,8 +429,10 @@ static int rk_nfc_setup_interface(struct nand_chip *chip, int target,
>  		return 0;
> 
>  	timings = nand_get_sdr_timings(conf);
> -	if (IS_ERR(timings))
> -		return -EOPNOTSUPP;
> +	if (IS_ERR(timings)) {
> +		rknand->timing = 0x1081;

This is way to magical anyway :)

> +		return 0;
> +	}
> 
>  	if (IS_ERR(nfc->nfc_clk))
>  		rate = clk_get_rate(nfc->ahb_clk);
> --
> 2.30.2
> 


Thanks,
Miquèl