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

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Message-Id: <DA56E103-CAA7-4C28-9528-9EAFF2C717CD@canonical.com>
Date:   Mon, 23 Mar 2020 13:38:09 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     ajayg@...dia.com
Cc:     Wolfram Sang <wsa@...-dreams.de>,
        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] i2c: nvidia-gpu: Handle timeout correctly in
 gpu_i2c_check_status()


> On Mar 12, 2020, at 00:58, Kai-Heng Feng <kai.heng.feng@...onical.com> 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.
> 
> Let's handle the unaccounted case that the target time equals to jiffies
> in gpu_i2c_check_status(), so the UCSI driver can let the probe fail as
> it should.
> 
> Fixes: c71bcdcb42a7 ("i2c: add i2c bus driver for NVIDIA GPU")
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

A gentle ping...

> ---
> drivers/i2c/busses/i2c-nvidia-gpu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-nvidia-gpu.c b/drivers/i2c/busses/i2c-nvidia-gpu.c
> index 62e18b4db0ed..1988e93c7925 100644
> --- a/drivers/i2c/busses/i2c-nvidia-gpu.c
> +++ b/drivers/i2c/busses/i2c-nvidia-gpu.c
> @@ -88,7 +88,7 @@ static int gpu_i2c_check_status(struct gpu_i2c_dev *i2cd)
> 		usleep_range(500, 600);
> 	} while (time_is_after_jiffies(target));
> 
> -	if (time_is_before_jiffies(target)) {
> +	if (time_is_before_eq_jiffies(target)) {
> 		dev_err(i2cd->dev, "i2c timeout error %x\n", val);
> 		return -ETIMEDOUT;
> 	}
> -- 
> 2.17.1
>