linux-kernel - Re: [PATCH 1/2] mmc: tmio: move MFD variant reset to a platform hook

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 3 Oct 2018 01:01:15 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-mmc@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mmc: tmio: move MFD variant reset to a platform hook

Hi Yamada-san,

On Mon, Oct 01, 2018 at 09:31:01PM +0900, Masahiro Yamada wrote:
> CTL_RESET_SDIO register is specific to the TMIO MFD (tmio_mmc.c).
> 
> Add a new hook host->reset for performing a platform-specific reset
> sequence, and move CTL_RESET_SDIO over there.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

I like it in general.

> +static void tmio_mmc_reset(struct tmio_mmc_host *host)
> +{
> +	sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
> +	usleep_range(10000, 11000);
> +	sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
> +	usleep_range(10000, 11000);
> +}
> +

Are you sure resetting SDIO works independently of resetting SD? Maybe
we should add resetting SD here, too, to keep the pattern...

> --- a/drivers/mmc/host/tmio_mmc_core.c
> +++ b/drivers/mmc/host/tmio_mmc_core.c
> @@ -164,14 +164,13 @@ static void tmio_mmc_reset(struct tmio_mmc_host *host)
>  {
>  	/* FIXME - should we set stop clock reg here */
>  	sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
> -	if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
> -		sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
>  	usleep_range(10000, 11000);
>  	sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
> -	if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG)
> -		sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
>  	usleep_range(10000, 11000);

... and have this simplified reset pattern either also in a seperate
function, or doing...

>  
> +	if (host->reset)
> +		host->reset(host);
	else
		simplified_reset_pattern

?

What's your opinion?

Regards,

   Wolfram


Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)