linux-kernel - Re: [PATCH] drm/amd/powerplay/smu7_hwmgr: replace blocking delay with non-blocking

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Message-ID: <20190616144309.GA8174@obi-wan>
Date:   Sun, 16 Jun 2019 16:43:10 +0200
From:   Yrjan Skrimstad <yrjan@...imstad.net>
To:     Alex Deucher <alexdeucher@...il.com>
Cc:     Maling list - DRI developers <dri-devel@...ts.freedesktop.org>,
        David Airlie <airlied@...ux.ie>,
        LKML <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Alex Deucher <alexander.deucher@....com>,
        Evan Quan <evan.quan@....com>, Rex Zhu <rex.zhu@....com>,
        Christian König <christian.koenig@....com>
Subject: Re: [PATCH] drm/amd/powerplay/smu7_hwmgr: replace blocking delay
 with non-blocking

On Thu, Jun 13, 2019 at 09:57:24AM -0400, Alex Deucher wrote:
> The patch is fine and I can apply it (I don't think there are any
> restrictions on sleeping in sysfs), but this code only gets executed
> when you actually read the power status from the card (e.g., via sysfs
> or debugfs).  Presumably you have something in userspace polling one
> of those files on a regular basis?
> 
> Alex

That is an interesting observation to me. I am actually running
lm-sensors, although only every 15 seconds. I suppose that this might
be the reason this happens to me.

- Yrjan