linux-kernel - Re: [PATCH v8] i2c: riic: Implement bus recovery

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Message-ID: <aAFgwEB4SdgH-1fQ@shikoro>
Date: Thu, 17 Apr 2025 22:12:48 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc: Chris Brandt <chris.brandt@...esas.com>,
	Andi Shyti <andi.shyti@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	linux-renesas-soc@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
	Andy Shevchenko <andy@...nel.org>
Subject: Re: [PATCH v8] i2c: riic: Implement bus recovery


> As suggested I have the below now, (are there any changes Ive missed?)

Well, get_sda should really only get SDA :)
> 
> +static int riic_get_sda(struct i2c_adapter *adap)
> +{
> +       struct riic_dev *riic = i2c_get_adapdata(adap);
> +
> +       /* Check if the bus is busy or SDA is not high */
> +       if ((riic_readb(riic, RIIC_ICCR2) & ICCR2_BBSY) ||
> +           !(riic_readb(riic, RIIC_ICCR1) & ICCR1_SDAI))
> +               return -EBUSY;
> +
> +       return 1;
> +}

I have

+static int riic_get_sda(struct i2c_adapter *adap)
+{
+       struct riic_dev *riic = i2c_get_adapdata(adap);
+
+       return !!(riic_readb(riic, RIIC_ICCR1) & ICCR1_SDAI);
+}

I believe the BBSY handling could be why it does not work.


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