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

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Message-ID: <2033574.q3E8txTlp8@avalon>
Date:   Mon, 04 Dec 2017 21:34:36 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Nick Bowler <nbowler@...conx.ca>
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 Nick,

On Monday, 4 December 2017 21:30:01 EET Nick Bowler wrote:
> 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.

You're reading my mind :-)

-- 
Regards,

Laurent Pinchart