linux-kernel - Re: [PATCH 1/3] mmc: fix mmc mode selection for HS-DDR and higher

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Message-ID: <472b6b94-a773-e4cd-07c0-4b184a840f87@rock-chips.com>
Date:	Wed, 1 Jun 2016 10:36:51 +0800
From:	Shawn Lin <shawn.lin@...k-chips.com>
To:	Chen-Yu Tsai <wens@...e.org>, Ulf Hansson <ulf.hansson@...aro.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	shawn.lin@...k-chips.com, Hans de Goede <hdegoede@...hat.com>,
	linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/3] mmc: fix mmc mode selection for HS-DDR and higher

On 2016/5/29 15:04, Chen-Yu Tsai wrote:
> When IS_ERR_VALUE was removed from the mmc core code, it was replaced
> with a simple not-zero check. This does not work, as the value checked
> is the return value for mmc_select_bus_width, which returns the set
> bit width on success. This made eMMC modes higher than HS-DDR unusable.
>
> Fix this by checking for a positive return value instead.

Reviewed-by: Shawn Lin <shawn.lin@...k-chips.com>

>
> Fixes: 287980e49ffc ("remove lots of IS_ERR_VALUE abuses")
> Cc: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  drivers/mmc/core/mmc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index c984321d1881..aafb73d080ca 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1276,7 +1276,7 @@ static int mmc_select_hs200(struct mmc_card *card)
>  	 * switch to HS200 mode if bus width is set successfully.
>  	 */
>  	err = mmc_select_bus_width(card);
> -	if (!err) {
> +	if (err > 0) {
>  		val = EXT_CSD_TIMING_HS200 |
>  		      card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
>  		err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> @@ -1583,7 +1583,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
>  	} else if (mmc_card_hs(card)) {
>  		/* Select the desired bus width optionally */
>  		err = mmc_select_bus_width(card);
> -		if (!err) {
> +		if (err > 0) {
>  			err = mmc_select_hs_ddr(card);
>  			if (err)
>  				goto free_card;
>


-- 
Best Regards
Shawn Lin