linux-kernel - Re: [PATCH 16/16] soc: imx: gpcv2: remove waiting handshake in power up

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]

Message-ID: <abde5337ac265287f8e1225846e140e8df370f47.camel@pengutronix.de>
Date:   Thu, 29 Apr 2021 16:34:31 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>, robh+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        p.zabel@...gutronix.de, krzk@...nel.org, agx@...xcpu.org,
        marex@...x.de, andrew.smirnov@...il.com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ping.bai@....com,
        frieder.schrempf@...tron.de, aford173@...il.com, abel.vesa@....com,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH 16/16] soc: imx: gpcv2: remove waiting handshake in
 power up

Am Donnerstag, dem 29.04.2021 um 15:30 +0800 schrieb Peng Fan (OSS):
> From: Peng Fan <peng.fan@....com>
> 
> i.MX8MM has blk ctl module, the handshake can only finish after setting
> blk ctl. The blk ctl driver will set the bus clk bit and the handshake
> will finish there. we just add a delay and suppose the handshake will
> finish after that.

Instead of this patch, just drop patch 05/16 from this series. I think
we should leave a comment in the code on why we aren't waiting for the
handshake ack, as this is non-obvious from looking at the driver code. 

Basically add a polished version of the commit log from this patch into
the driver code.

Regards,
Lucas

> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/soc/imx/gpcv2.c | 8 --------
>  1 file changed, 8 deletions(-)
> 
> diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
> index 49dd137f6b94..04564017bfe9 100644
> --- a/drivers/soc/imx/gpcv2.c
> +++ b/drivers/soc/imx/gpcv2.c
> @@ -251,14 +251,6 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
>  		regmap_update_bits(domain->regmap, GPC_PU_PWRHSK,
>  				   domain->bits.hskreq, domain->bits.hskreq);
>  
> 
> 
> 
> -		ret = regmap_read_poll_timeout(domain->regmap, GPC_PU_PWRHSK,
> -					       reg_val,
> -					       (reg_val & domain->bits.hskack),
> -					       0, USEC_PER_MSEC);
> -		if (ret) {
> -			dev_err(domain->dev, "failed to power up ADB400\n");
> -			goto out_clk_disable;
> -		}
>  	}
>  
> 
> 
> 
>  	/* Disable reset clocks for all devices in the domain */