linux-kernel - Re: [PATCH 1/4] mfd: mc13783: Take care of semantic inversion between read and write value of two bits in POWER

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: <1262948011.2050.3.camel@climbing-alby>
Date:	Fri, 08 Jan 2010 11:53:31 +0100
From:	Alberto Panizzo <maramaopercheseimorto@...il.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	Sascha linux-arm <s.hauer@...gutronix.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel-infradead <linux-arm-kernel@...ts.infradead.org>,
	Liam Girdwood <lrg@...mlogic.co.uk>
Subject: Re: [PATCH 1/4] mfd: mc13783: Take care of semantic inversion
 between read and write value of two bits in POWER_MISCELLANEUS register.

Sorry for late response.. as Uwe said, we have discuss about this 
and I will prepare another patch that involve the regulator driver.

Alberto!

Il giorno mar, 05/01/2010 alle 20.55 +0100, Uwe Kleine-König ha scritto:
> On Tue, Jan 05, 2010 at 07:15:42PM +0100, Samuel Ortiz wrote:
> > > @@ -187,6 +190,13 @@ int mc13783_reg_write(struct mc13783 *mc13783, unsigned int offset, u32 val)
> > >  
> > >         buf = 1 << 31 | offset << MC13783_REGOFFSET_SHIFT | val;
> > >  
> > > +       /* Take care of table 4-24 in Freescale MC13783IGPLDRM.pdf making
> > > +        * the assumption that PWGTnDRV signals controls core power supplies
> > > +        * that software must not disable. */
> > > +       if (offset == MC13783_REG_POWER_MISCELLANEOUS)
> > > +               buf &= ~(MC13783_REGCTRL_PWGT1SPIEN |
> > > +                        MC13783_REGCTRL_PWGT2SPIEN);
> > > +
> > Although I see where you want to go, I dont really enjoy that solution.
> > I would prefere to have specific register write/rmw routines for
> > MC13783_REG_POWER_MISCELLANEOUS, and at the same time forbid to access the
> > latter from the current mc13783_reg_* API.
> Ack.  This is what I already suggested in
> 
> 	http://thread.gmane.org/gmane.linux.kernel/927112/focus=930317
> 
> (This happend to be a reply to patch 2/4 as I replied to Alberto's ping
> for patches 1 and 2.)
> 
> Best regards
> Uwe
> 


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/