linux-kernel - Re: [PATCH 1/2] pinctrl: samsung: fix suspend/resume functionality

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Date:	Thu, 16 May 2013 23:19:47 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Tomasz Figa <tomasz.figa@...il.com>
Cc:	Doug Anderson <dianders@...omium.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Olof Johansson <olof@...om.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Prathyush K <prathyush.k@...sung.com>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] pinctrl: samsung: fix suspend/resume functionality

Am Donnerstag, 16. Mai 2013, 21:19:20 schrieb Tomasz Figa:
[...]
> > +
> > +		if (type->fld_width[PINCFG_TYPE_CON_PDN]) {
> > +			bank->pm_save.conpdn = readl(reg +
> > +				type->reg_offset[PINCFG_TYPE_CON_PDN]);
> > +			bank->pm_save.pudpdn = readl(reg +
> > +				type->reg_offset[PINCFG_TYPE_PUD_PDN]);
> > +		}
> 
> I wonder if you couldn't do all the saving here in a single loop over all
> pin control types, like:
> 
> 	unsigned int offsets = bank->type->reg_offsets;
> 	unsigned int widths = bank->type->fld_width;
> 
> 	for (i = 0; i < PINCFG_TYPE_NUM; ++i)
> 		if (widths[i])
> 			bank->pm_save[i] = readl(reg + offsets[i]);
> 
> The only thing not handled by this loop is second CON registers in banks
> with two of them. I can't think of any better solution for this other than
> just adding a special case after the loop.

doing this in the loop over the pinctrl types like Tomasz suggests, also 
nicely fixes the problem of s3c24xx [0] only having FUNC, DAT and PUD and some 
(gpa) not even having the PUD, which was not checked in the original patch.


Heiko

[0] patch is with Kgene currently, so should make it into 3.11
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