On Sat, Apr 09, 2016 at 11:14:38AM +0200, Lluís Batlle i Rossell wrote: > On Thu, Apr 07, 2016 at 11:54:39AM +0200, Lluís Batlle i Rossell wrote: > > On Thu, Apr 07, 2016 at 03:19:04PM +0530, Kumar, Shobhit wrote: > > > On Wednesday 06 April 2016 04:26 PM, Lluís Batlle i Rossell wrote: > > > >I don't see any trace of pwm/lpss in dmesg, so it's normal that i915 fails > > > >to find it. I wonder if there may be a problem in the ACPI table. I have > > > >the DSDT and it clearly reports the: > > > > > > > >Name (_CID, "80860F09") // _CID: Compatible ID > > > >Name (_DDN, "Intel(R) PWM Controller #2 - 80860F09") // _DDN: DOS Device Name > > > > > > > >Which should be the lpss pwm. But somehow it is not loaded, so I guess it > > > >fails the probing. > > > > > > Can we put some prints in the probe routines and see whats happening in the > > > pwm-lpss-platform.c driver. There is also a PCI PWM LPSS driver - > > > pwm-lpss-pci.c Can you also enable that and see if the probe for that is > > > being called and successful ? I think there is a lot to be done first, to be able to test this. If I understand correctly, despite the lpss pwm may be available, it will not be used as pwm-backlight (video/backlight/pwm_bl.c) because it depends on "CONFIG_OF" and it is ready for devicetree only. The only x86 that enable OF are X86_INTEL_CE and OLPC, and pwm_bl is completely disabled without OF. I don't have any INTEL_CE or OLPC, this LPSS of the Atom SoC is a different thing. So, someone has to implement pwm_bl on my x86 first, for any of the patches wrt i915 to be used at all. Should X86_INTEL_LPSS enable OF? Should there be a devicetree definition for it first? Does someone have to allow pwm_bl to work with ACPI? Is all that ready in some branch of some other linux team? Regards, Lluís. -- (Escriu-me xifrat si saps PGP / Write ciphered if you know PGP) PGP key D4831A8A - https://emailselfdefense.fsf.org/ _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
