linux-kernel - RE: [PATCH V2] mmc: core: improve reasonableness of bus width setting for HS400es

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Date:   Mon, 16 Jul 2018 08:23:59 +0000
From:   Fang Hongjie(方洪杰) 
        <hongjiefang@...micro.com>
To:     "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>
CC:     "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "shawn.lin@...k-chips.com" <shawn.lin@...k-chips.com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "wsa+renesas@...g-engineering.com" <wsa+renesas@...g-engineering.com>,
        "bst@...gutronix.de" <bst@...gutronix.de>,
        "jinqian@...gle.com" <jinqian@...gle.com>,
        "chanho.min@....com" <chanho.min@....com>,
        "kyle.roeschley@...com" <kyle.roeschley@...com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH V2] mmc: core: improve reasonableness of bus width
 setting for HS400es


> mmc_select_hs400es() calls mmc_select_bus_width() which will continue
> to set 4bit transfer mode if fail to set 8bit mode. The bus width
> should not be set to 4bit in HS400es.
> 
> When fail to set 8bit mode, need return error directly for HS400es.
> 
> Signed-off-by: Hongjie Fang <hongjiefang@...micro.com>
> ---
>  drivers/mmc/core/mmc.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 4466f5d..4bd6c09 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1021,8 +1021,11 @@ static int mmc_select_bus_width(struct mmc_card *card)
>  				 EXT_CSD_BUS_WIDTH,
>  				 ext_csd_bits[idx],
>  				 card->ext_csd.generic_cmd6_time);
> -		if (err)
> +		if (err) {
> +			if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES)
> +				return err;
>  			continue;
> +		}
> 
>  		bus_width = bus_widths[idx];
>  		mmc_set_bus_width(host, bus_width);
> --
> 1.9.1

Ping.
Any suggestion for this patch ?


B&R
Hongjie