linux-kernel - Re: PROBLEM: Asus C201 video mode problems on HDMI hotplug (regression)

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Date:   Mon, 4 Dec 2017 14:30:01 -0500
From:   Nick Bowler <nbowler@...conx.ca>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Archit Taneja <architt@...eaurora.org>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Dave Airlie <airlied@...hat.com>,
        Andrzej Hajda <a.hajda@...sung.com>
Subject: Re: PROBLEM: Asus C201 video mode problems on HDMI hotplug
 (regression)

Hi,

On 2017-12-04 21:06 +0200, Laurent Pinchart wrote:
> As you reported that the PLL lock failure message is not printed, the
> failure can only come from either the extra delay introduced by the
> above loop, or from reading the HDMI_PHY_STAT0 register.
> 
> How many iterations of the for loop execute before the condition
> becomes true?

Judging from the log posted elsethread (where I added extra printouts),
it seems to consistently become true on the second iteration.

I will try to rule out read side effects by replacing the polling loop
with an unconditional delay.

Cheers,
-- 
Nick Bowler