On Wed, Feb 13, 2019 at 7:44 PM Andrzej Hajda <a.ha...@samsung.com> wrote:
> On 13.02.2019 14:40, Vinay Simha B N wrote: > > Andrzej/Daniel, > > > > please suggest any input on the scenario for temperature control and > > dsi bridge enable/disable. > > > > On Mon, Feb 11, 2019 at 2:41 PM Vinay Simha B N <simha...@gmail.com > > <mailto:simha...@gmail.com>> wrote: > > > > dsi2hdmi(adv7511) chip operating temperature range is -10 degC > > to +85 degC. We want to enable/disable the bridge only when > > temperature range is inbetween these range. > > > > We have temperature control chip to read the temp, tLow an tHigh > > can be set. whenever interrupt(alert) triggers we want to > > enablel/disable the bridge. > > > > Any suggestion what is the better way to handle this scenario? > > > > Why do you need to bother about this quite big range at all? > we are looking for -10 deg C, this system will be used in a place where temp goes beyond -20 deg C... processor(apq8016/410c) can handle upto -30, but dsi2hdmi(adv7533) chip if enabled beyond -10 deg C, life of the chip goes down or it cannot operate at all. > > I guess the best would be to set whole platform operating temperature > range, and poweroff/sleep/slow down/??? whole system, not just one > random chip, which probably is not the most fragile piece, am I right? > > right now we are focused only to disable the hdmi chip if temp goes beyond -10, since this is only chip in board faces temp issue, other components are fine to go upto -30 deg C. > > If you really insist on handling it per chip, you can try to investigate > following paths: > > 1. Just disable the chip, without noticing drm, other drivers, or > userspace, and re-enable it if temperature become acceptable, but I am > not sure if this will not change behavior of other chips. > > dsi2hdmi tied with drm framework, i need to enable/disable the bridge. i can disable the regulators enabled for it , but this does not work as we want. > 2. Disable the chip and report to the drm subsystem > connector_status_disconnected - this will cause drm to stop display > pipeline and userspace notification. > > any references/driver on how to disable and report to drm susbsystem will help to implement. connector_status_disconnected i need to call in the interrupt handler of tmp102 driver. in userspace when i tried manually below commands, there is no impact in the display. /sys/class/drm/card0-HDMI-A-1/status echo off > status echo on > status > > Regards > > Andrzej > > > > > > regards, > > vinaysimha > > > > On Mon, Feb 11, 2019 at 2:10 PM Daniel Vetter <dan...@ffwll.ch > > <mailto:dan...@ffwll.ch>> wrote: > > > > On Mon, Feb 11, 2019 at 09:32:54AM +0100, Andrzej Hajda wrote: > > > On 11.02.2019 07:52, Vinay Simha B N wrote: > > > > hi, > > > > > > > > is it possible to control the drm bridge from another > > driver in irq > > > > handler(enable/disable the bridge)? > > > > > > > > > If you mean 'in irq context' the answer is no, usually > > enable/disable > > > callbacks can sleep, so cannot be called from atomic context. > > > > > > > > > > > > > > is there a way to control the "dpms force off" and "dpms > > force on" in > > > > the interrupt handler? > > > > > > > > > Could you elaborate more on both subjects. > > > > Yeah, please explain what you want to use this for. dpms on/off > is > > controlled by userspace, the kernel should not change that > > state behind > > usersapce's back. If this is for some manuel refresh display, > > then that's > > a bit a different story ofc, but for that you don't want to do > > a real dpms > > force off/on. > > -Daniel > > > > > > > > > Regards > > > > > > Andrzej > > > > > > > > > > > > > > -- > > > > regards, > > > > vinaysimha > > > > > > > > _______________________________________________ > > > > dri-devel mailing list > > > > dri-devel@lists.freedesktop.org > > <mailto:dri-devel@lists.freedesktop.org> > > > > https://lists.freedesktop.org/mailman/listinfo/dri-devel > > > > > > > > > _______________________________________________ > > > dri-devel mailing list > > > dri-devel@lists.freedesktop.org > > <mailto:dri-devel@lists.freedesktop.org> > > > https://lists.freedesktop.org/mailman/listinfo/dri-devel > > > > -- > > Daniel Vetter > > Software Engineer, Intel Corporation > > http://blog.ffwll.ch > > > > > > > > -- > > regards, > > vinaysimha > > > > > > > > -- > > regards, > > vinaysimha > > > -- regards, vinaysimha
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