linux-kernel - Re: [PATCH v3] i2c: nvidia-gpu: Handle timeout correctly in gpu_i2c_check

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Message-ID: <20200324214734.GI7641@ninjato>
Date:   Tue, 24 Mar 2020 22:47:34 +0100
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     ajayg@...dia.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "open list:I2C CONTROLLER DRIVER FOR NVIDIA GPU" 
        <linux-i2c@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] i2c: nvidia-gpu: Handle timeout correctly in
 gpu_i2c_check_status()

On Tue, Mar 24, 2020 at 11:28:11PM +0800, Kai-Heng Feng wrote:
> Nvidia card may come with a "phantom" UCSI device, and its driver gets
> stuck in probe routine, prevents any system PM operations like suspend.
> 
> There's an unaccounted case that the target time can equal to jiffies in
> gpu_i2c_check_status(), let's solve that by using readl_poll_timeout()
> instead of jiffies comparison functions. 
> 
> Fixes: c71bcdcb42a7 ("i2c: add i2c bus driver for NVIDIA GPU")
> Suggested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

Applied to for-current, thanks!


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