On 28 June 2012 20:44, Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote: > On Thu, 2012-06-28 at 18:43 +0530, Jassi Brar wrote: > >> A quick reaction of my guts say, we simply enable 5V/HPD_IRQ during >> probe and disable during remove. >> HDMI enable/disable via /sysfs/ and HPD (de)assertion, switch only >> HDMI_PHY on/off. >> The user selecting "Autodetect and Configure" option would then equate >> to "(un)loading" of the HDMI driver. >> Not to mean a trivial job. > > One more thing I realized while thinking about this: > > While it could be argued that the power draw from having the tpd12s015 > always enabled is very small, I think it could matter. If you consider a > phone with HDMI output, it's likely that the phone is locked 99% of the > time. When the phone is locked, there's no need to keep the HDMI HPD > enabled. So this could add to a considerable amount of power wasted, if > the HPD was always enabled. > > At least I can't figure out a reason why one would want the HPD to work > when the phone is locked. Also, I have never used the HDMI output on my > phone, so I'd be glad if it was totally powered off if it gave me more > standby hours =). > Of course, I don't suggest imposing any hard rule here. All I suggest is make it platform dependent and provide a way from user-space too to enable/disable HPD. -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
