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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CHV] Backlight init fails on Surface 3 if module load order is wrong"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96571#c12">Comment # 12</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CHV] Backlight init fails on Surface 3 if module load order is wrong"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96571">bug 96571</a>
from <span class="vcard"><a class="email" href="mailto:shobhit.kumar@intel.com" title="Shobhit <shobhit.kumar@intel.com>"> <span class="fn">Shobhit</span></a>
</span></b>
<pre>pwm_bl.c is not used and as you said is based on device tree. The code that you
point in i915, I wrote based on ACPI match from
drivers/mfd/intel_soc_pmic_core.c
The MFD driver will add this controller to pwm_table and will call the
necessary probes. This works fine as I have tested the code for
pwm-crystalcove. The pwm-crc is a cell device for MFD crystal cove PMIC.
In case of LPSS, my understanding is that we need to load
drivers/pwm/pwm-lpss.c and drivers/pwm/pwm-lpss-platform.c which is again based
on ACPI. The corresponding ID in the driver is "80860F09". So once we ensure
that this is loading the glue path should be okay. I just could not test this
because I don't have a device.
If you can enable -
CONFIG_PWM_LPSS=y
CONFIG_PWM_LPSS_PLATFORM=y
And use my other patches, I assumed it should work. Of course I maybe wrong, so
if you have not tested this, can you test it and update me on your findings ?
Basically check if in pwm-lpss-platform.c probe is being called or not.</pre>
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