Re: drm dsi2hdmi bridge - temperature sensor
rob, hpd works in kernel 5.0.0-rc6, i.e postboot if we connect hdmi display comes(apq8016). added the temperature alert_handler in adv7511_drv.c in adv7511_detect , i had set status = connector_status_disconnected; , since display should not come initially, but when irq calls schedule_work(>hpd_work)/ adv7511_irq_process(adv7511, true); in temp_alert_handler , hdmi display does not comes [drm] Cannot find any crtc or sizes any suggestion on how to initially not switch on the hdmi display and later enable when irq from temp alert. On Fri, Feb 15, 2019 at 1:24 AM Sam Ravnborg wrote: > Hi Rob. > > > > > > > (Background is to not enable the display until temp is within an > > > acceptable range, and disable it if it goes out of range, to prevent > > > hw damage I guess) > > > > The thermal framework already has support for temperature trip points > > triggering "throttlers". I guess the display could be a throttling > > device. Really, why wouldn't you just shutdown? Seems like a strange > > usecase to keep running with the display going on and off based on > > temperature. > > (Jumping into the middle of a discussion here, and maybe I got it wrong) > > For the devices I work with a shutdown would be highly unexpected > just because something insignificant like the display fails to work. > The devices are used to control the climate for birds, sometimes in hot > areas. > We do not want the device to shut down and let emergency take over, > due to a non-functional display. > > Sam > -- regards, vinaysimha ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
Re: drm dsi2hdmi bridge - temperature sensor
On Fri, 15 Feb 2019 at 1:15 AM, Rob Herring wrote: > On Thu, Feb 14, 2019 at 9:27 AM Rob Clark wrote: > > > > I mean, I guess it should be possible with an ugly non-upstreamable > > hack, maybe using a notifier_chain to call from the temp sensor driver > > to the hdmi bridge driver. I'm not really sure how that could be > > represented cleanly in dt, maybe Rob Herring or someone else on > > dri-devel has some ideas. > > > > (Background is to not enable the display until temp is within an > > acceptable range, and disable it if it goes out of range, to prevent > > hw damage I guess) > > The thermal framework already has support for temperature trip points > triggering "throttlers". I guess the display could be a throttling > device. Really, why wouldn't you just shutdown? Seems like a strange > usecase to keep running with the display going on and off based on > temperature. > We do not want to shutdown the system , since it’s temp threshold is up to -30 deg c , since display(adv7533) is upto -10 deg c, will control enable/disable based on temp range, otherwise life of the adv chip goes down and may not be operated later. > > Rob > > > > > > > BR, > > -R > > > > On Thu, Feb 14, 2019 at 7:32 AM Vinay Simha B N > wrote: > > > > > > rob, > > > > > > i am not getting much inputs in the freenode / dr-devel/irc forum. > > > > > > please suggest some inputs. > > > > > > In the interrupt handler of temperature sensor is it possible to > control the drm bridge/encoder(adv7511) status to enable and disable? > > > > > > any other better approach to handle this scenario? > > > > > > -- > > > regards, > > > vinaysimha > -- regards, vinaysimha ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
Re: drm dsi2hdmi bridge - temperature sensor
Hi Rob. > > > > (Background is to not enable the display until temp is within an > > acceptable range, and disable it if it goes out of range, to prevent > > hw damage I guess) > > The thermal framework already has support for temperature trip points > triggering "throttlers". I guess the display could be a throttling > device. Really, why wouldn't you just shutdown? Seems like a strange > usecase to keep running with the display going on and off based on > temperature. (Jumping into the middle of a discussion here, and maybe I got it wrong) For the devices I work with a shutdown would be highly unexpected just because something insignificant like the display fails to work. The devices are used to control the climate for birds, sometimes in hot areas. We do not want the device to shut down and let emergency take over, due to a non-functional display. Sam ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
Re: drm dsi2hdmi bridge - temperature sensor
On Thu, Feb 14, 2019 at 9:27 AM Rob Clark wrote: > > I mean, I guess it should be possible with an ugly non-upstreamable > hack, maybe using a notifier_chain to call from the temp sensor driver > to the hdmi bridge driver. I'm not really sure how that could be > represented cleanly in dt, maybe Rob Herring or someone else on > dri-devel has some ideas. > > (Background is to not enable the display until temp is within an > acceptable range, and disable it if it goes out of range, to prevent > hw damage I guess) The thermal framework already has support for temperature trip points triggering "throttlers". I guess the display could be a throttling device. Really, why wouldn't you just shutdown? Seems like a strange usecase to keep running with the display going on and off based on temperature. Rob > > > BR, > -R > > On Thu, Feb 14, 2019 at 7:32 AM Vinay Simha B N wrote: > > > > rob, > > > > i am not getting much inputs in the freenode / dr-devel/irc forum. > > > > please suggest some inputs. > > > > In the interrupt handler of temperature sensor is it possible to control > > the drm bridge/encoder(adv7511) status to enable and disable? > > > > any other better approach to handle this scenario? > > > > -- > > regards, > > vinaysimha ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
Re: drm dsi2hdmi bridge - temperature sensor
I mean, I guess it should be possible with an ugly non-upstreamable hack, maybe using a notifier_chain to call from the temp sensor driver to the hdmi bridge driver. I'm not really sure how that could be represented cleanly in dt, maybe Rob Herring or someone else on dri-devel has some ideas. (Background is to not enable the display until temp is within an acceptable range, and disable it if it goes out of range, to prevent hw damage I guess) BR, -R On Thu, Feb 14, 2019 at 7:32 AM Vinay Simha B N wrote: > > rob, > > i am not getting much inputs in the freenode / dr-devel/irc forum. > > please suggest some inputs. > > In the interrupt handler of temperature sensor is it possible to control the > drm bridge/encoder(adv7511) status to enable and disable? > > any other better approach to handle this scenario? > > -- > regards, > vinaysimha ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
