Re: [RFC PATCH 2/6] mmc: renesas_sdhi: complain loudly if driver needs update

["Niklas Söderlund" <niklas.soderlund@ragnatech.se>]

Hi Wolfram,

Thanks for your patch.

On 2020-01-29 21:37:05 +0100, Wolfram Sang wrote:
> When the tap array in the driver is too low, this is not a warning but
> an error. Also _once is not helpful, we should make sure it is
> prominently in the logs. It is safe to do this because this will only
> show up during SoC enablement when we a new SoCs needs more taps (if
> that ever will happen).
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
> ---
> 
> Note: 'unsigned long' seems big enough for a while. But, famous last
> words(tm). We could handle this at runtime by reallocating a bigger
> buffer. Very unsure if it is worth it, though.

I can not tell if it's worth doing this now or not. But if it's a error 
instead of a warning it will be easier to spot if we should have done so 
;-)

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>

> 
>  drivers/mmc/host/renesas_sdhi_core.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
> index b3ab66f963f8..d63aeb35bd0b 100644
> --- a/drivers/mmc/host/renesas_sdhi_core.c
> +++ b/drivers/mmc/host/renesas_sdhi_core.c
> @@ -499,9 +499,9 @@ static int renesas_sdhi_execute_tuning(struct tmio_mmc_host *host, u32 opcode)
>  		return 0; /* Tuning is not supported */
>  
>  	if (host->tap_num * 2 >= sizeof(host->taps) * BITS_PER_BYTE) {
> -		dev_warn_once(&host->pdev->dev,
> -			"Too many taps, skipping tuning. Please consider updating size of taps field of tmio_mmc_host\n");
> -		return 0;
> +		dev_err(&host->pdev->dev,
> +			"Too many taps, please update 'taps' in tmio_mmc_host!\n");
> +		return -EINVAL;
>  	}
>  
>  	priv->doing_tune = true;
> -- 
> 2.20.1
> 

-- 
Regards,
Niklas Söderlund