linux-kernel - RE: [PATCH 2/2] regulator: tps65217: Fix voltage boundary checking in tps65217_pmic_map

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Message-ID: <331ABD5ECB02734CA317220B2BBEABC13E9E8E0E@DBDE01.ent.ti.com>
Date:	Tue, 3 Jul 2012 07:16:03 +0000
From:	"AnilKumar, Chimata" <anilkumar@...com>
To:	Axel Lin <axel.lin@...il.com>
CC:	"Girdwood, Liam" <lrg@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Nori, Sekhar" <nsekhar@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: RE: [PATCH 2/2] regulator: tps65217: Fix voltage boundary checking
 in tps65217_pmic_map_voltage

On Tue, Jul 03, 2012 at 12:39:45, Axel Lin wrote:
> 
> > In side tps65217_pmic_map_voltage() we have
> > 
> > tps->info[rid]->uv_to_vsel(850000, &sel) nothing but
> > tps65217_uv_to_vsel1(850000, &sel);
> > 
> > sel = (((850000 - 900000) + (25000) - 1) / (25000));
> > sel = ((-25001)/(25000));
> > sel = -1; /* Which is not expected */
> > 
> > Ideally this would be the change
> > 
> > 	if (min_uV < tps->info[rid]->min_uV)
> > 		min_uV = tps->info[rid]->min_uV;
> > 
> ok. I got your point now.
> 
> So if min_uV < tps->info[rid]->min_uV, we need to set
> min_uV = tps->info[rid]->min_uV.
> This is because the equation we used in uv_to_vsel() does not allow
> min_uV < tps->info[rid]->min_uV, otherwise it returns negative selector.
> 
> 
> > 	if (max_uV > tps->info[rid]->max_uV)
> > 		max_uV = tps->info[rid]->max_uV;
> 
> This looks not necessary. the equation in uv_to_vsel() does not use
> max_uV.
> 

Yes, I agree.

Regards
AnilKumar--
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