linux-kernel - RE: [PATCHv2] clk:aspeed:Fix AST2600 hpll calculate formula

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Message-ID: <HK0PR06MB33801C3DADFD87363C09BFAFF2DB9@HK0PR06MB3380.apcprd06.prod.outlook.com>
Date:   Wed, 15 Sep 2021 02:52:38 +0000
From:   Ryan Chen <ryan_chen@...eedtech.com>
To:     Stephen Boyd <sboyd@...nel.org>,
        "Claudiu.Beznea@...rochip.com" <Claudiu.Beznea@...rochip.com>,
        "andrew@...id.au" <andrew@...id.au>,
        "joel@....id.au" <joel@....id.au>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>
Subject: RE: [PATCHv2] clk:aspeed:Fix AST2600 hpll calculate formula

> -----Original Message-----
> From: Stephen Boyd <sboyd@...nel.org>
> Sent: Wednesday, September 15, 2021 9:17 AM
> To: Claudiu.Beznea@...rochip.com; Ryan Chen
> <ryan_chen@...eedtech.com>; andrew@...id.au; joel@....id.au;
> linux-clk@...r.kernel.org; linux-kernel@...r.kernel.org;
> mturquette@...libre.com
> Subject: RE: [PATCHv2] clk:aspeed:Fix AST2600 hpll calculate formula
> 
> Quoting Ryan Chen (2021-09-12 22:31:46)
> > > > +               if (hwstrap & BIT(10))
> > > > +                       m = 0x5F;
> > > > +               else {
> > > > +                       if (hwstrap & BIT(8))
> > >
> > > You may write it directly:
> > >                 else if (hwstrap & BIT(8))
> > >
> > Hello,
> >         Like I commit message M = SCU500[10] ? 0x5F : SCU500[8] ? 0xBF :
> SCU200[12:0]
> >         it need keep from register read, if BIT(8)/BIT(10) not 1.
> >
> 
> I don't get it. The review comment was that the else { if (...) can be collapsed
> into an else if (..) What does commit message have to do with it?
Sorry for confuse.
Or do you mean like following modification?

               if (hwstrap & BIT(10))
                       m = 0x5F;
               else if (hwstrap & BIT(8))
                       m = 0xBF;