Hi Yakir,
On Wed, Nov 04, 2015 at 08:48:38AM +0800, Yakir Yang wrote:
> On 11/03/2015 12:38 PM, Brian Norris wrote:
> >On Thu, Oct 29, 2015 at 09:58:38AM +0800, Yakir Yang wrote:
> >(FYI, I came across this by inspection when comparing Heiko's
> >'somewhat-stable' branch [1] with this series. The former brings up eDP
> >fine on veyron-jaq, whereas this one doesn't yet, even with the above
> >change. Still debugging the issue.)
>
> Hmm... I'm not sure whether your eDP screen have the hotplug signal, so I
I believe hotplug is hooked up but...
> think you can try to add "analogix,force-hpd" flag into
> rk3288-veyron-jaq.dts
>
> &edp {
> analogix,need-force-hpd;
> }
...already tried, just in case. No luck.
> If that changes couldn't fix the problem, guess you may need max the panel
> power up delay time which pointed by Heiko. Like:
>
> Thanks,
> - Yakir
>
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> index 4fa5f69..546a506 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -82,6 +82,13 @@ static int analogix_dp_detect_hpd(struct
> analogix_dp_device *dp)
> */
> dev_dbg(dp->dev, "failed to get hpd plug status, try to
> force hpd\n");
>
> + /*
> + * Hotplug signal would indicate the right time to operate
> + * panel after poweron, but if the hotplug is missing, then
> + * panel would need wait hundreds of milliseconds at here.
> + */
> + mdelay(100);
> +
> analogix_dp_force_hpd(dp);
>
> if (analogix_dp_get_plug_in_status(dp) != 0) {
I'll give that a try. Per Heiko's suggestion, I've already hacked around
with adding delays in the regulator node, but this could give slightly
different behavior. I doubt it'll help, but I'll let you know if it
does.
Regards,
Brian
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