linux-kernel - Re: [PATCH] pinctrl: aspeed: Rework strap register write logic for the AST2500

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Date:   Wed, 30 Aug 2017 11:08:16 +0930
From:   Andrew Jeffery <andrew@...id.au>
To:     linux-gpio@...r.kernel.org
Cc:     linus.walleij@...aro.org, joel@....id.au,
        linux-kernel@...r.kernel.org, Yong Li <sdliyong@...il.com>
Subject: Re: [PATCH] pinctrl: aspeed: Rework strap register write logic for
 the AST2500

Hi Linus,

On Wed, 2017-08-23 at 23:11 +0930, Andrew Jeffery wrote:
> Yong Li found that writes to the AST2500 strapping register were not
> properly supported by the Aspeed pinctrl core and provided a patch to
> rectify the problem. Several revisions of the patch were posted and
> ultimately v4 should have been applied, however some unfortunate
> liberal application of tags on my part lead to confusion between v3[1]
> and v4[2].
> 
> Generate the diff between v3 and v4 to apply as a fixup patch.
> 
> [1] http://patchwork.ozlabs.org/patch/801662/
> [2] http://patchwork.ozlabs.org/patch/802946/
> 
> > Cc: Yong Li <sdliyong@...il.com>
> > Signed-off-by: Andrew Jeffery <andrew@...id.au>

Just wondering if you're going to pick this up? It's a fix for "1865af212dfa
pinctrl: aspeed: Fix ast2500 strap register write logic" in pinctrl/devel and
pinctrl/for-next.

Cheers,

Andrew

> ---
>  drivers/pinctrl/aspeed/pinctrl-aspeed.c | 26 ++++++++++++++++----------
>  1 file changed, 16 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed.c b/drivers/pinctrl/aspeed/pinctrl-aspeed.c
> index f2d5133f6993..7f13ce8450a3 100644
> --- a/drivers/pinctrl/aspeed/pinctrl-aspeed.c
> +++ b/drivers/pinctrl/aspeed/pinctrl-aspeed.c
> @@ -183,7 +183,6 @@ static int aspeed_sig_expr_set(const struct aspeed_sig_expr *expr,
>  {
> >  	int ret;
> >  	int i;
> > -	unsigned int rev_id;
>  
> >  	for (i = 0; i < expr->ndescs; i++) {
> >  		const struct aspeed_sig_desc *desc = &expr->descs[i];
> @@ -216,20 +215,27 @@ static int aspeed_sig_expr_set(const struct aspeed_sig_expr *expr,
>  
> >  		/* On AST2500, Set bits in SCU7C are cleared from SCU70 */
> >  		if (desc->ip == ASPEED_IP_SCU && desc->reg == HW_STRAP1) {
> > +			unsigned int rev_id;
> +
> >  			ret = regmap_read(maps[ASPEED_IP_SCU],
> >  				HW_REVISION_ID, &rev_id);
> >  			if (ret < 0)
> >  				return ret;
>  
> > -			if (0x04 == ((rev_id >> 24) & 0xff))
> > -				ret = regmap_write(maps[desc->ip],
> > -					HW_REVISION_ID, (~val & desc->mask));
> > -			else
> > -				ret = regmap_update_bits(maps[desc->ip],
> > -					desc->reg, desc->mask, val);
> > -		} else
> > -			ret = regmap_update_bits(maps[desc->ip], desc->reg,
> > -				desc->mask, val);
> > +			if (0x04 == (rev_id >> 24)) {
> > +				u32 value = ~val & desc->mask;
> +
> > +				if (value) {
> > +					ret = regmap_write(maps[desc->ip],
> > +						HW_REVISION_ID, value);
> > +					if (ret < 0)
> > +						return ret;
> > +				}
> > +			}
> > +		}
> +
> > +		ret = regmap_update_bits(maps[desc->ip], desc->reg,
> > +					 desc->mask, val);
>  
> >  		if (ret)
> >  			return ret;
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