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