linux-kernel - Re: [RESEND PATCH] i2c: rk3x: Handle a spurious start completion interrupt flag

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Message-ID: <YaSfZxtYtV+SfJqL@kunai>
Date:   Mon, 29 Nov 2021 10:37:43 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Ondrej Jirman <megous@...ous.com>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        "moderated list:ARM/Rockchip SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC support" 
        <linux-rockchip@...ts.infradead.org>,
        "open list:I2C SUBSYSTEM HOST DRIVERS" <linux-i2c@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH] i2c: rk3x: Handle a spurious start completion
 interrupt flag


> This causes I2C transfer being aborted in polled mode from a stop completion
> handler:

I wonder why this only happens in polling mode? The question behind that
is: is it really a spurious irq from the HW or is it maybe a race in the
driver? Because polling uses the same interrupt handler but just
periodically polls it.


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