PROBLEM: Asus C201 video mode problems on HDMI hotplug (regression)

Laurent Pinchart laurent.pinchart at
Mon Dec 4 19:34:36 UTC 2017

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 :-)


Laurent Pinchart

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