On 01/13/2016 11:00 AM, C. B. wrote:
On 12 January 2016 at 08:59, Shobhit Kumar <shobhit.kumar@xxxxxxxxx> wrote:
Not sending yet to pwm mailing list as this is all untested. C.B. please
test the patches and see if they work at all for you. For testing Please
enable -
CONFIG_PWM_LPSS=y
CONFIG_PWM_LPSS_PLATFORM=y
I applied these patches to 4.4-rc8. So far no progress:
[ 14.251512] [drm:pwm_setup_backlight [i915]] *ERROR* Failed to own
the pwm chip: pm_backlight
Are you sure this is pm_backlight, it should have printed pwm_backlight
as that is the name for the PMIC bases PWM. I checked the code and I
have not made a typo there.
I dug in a little and found that dev_priv->vbt.dsi.config->pwm_blc ==
0, I wonder if some of these Dell Venue's have different hardware?
This is the model I have:
This means that this device is using PMIC base PWM and not LPSS. I have
heard from Brain, that my CRC PWM driver is also broken in latest kernel
which should be probably used in this device. I am looking into that
separately.
Regards
Shobhit
[ 16.370481] Hardware name: Dell Inc. Venue 8 Pro 5830/09RP78, BIOS
A13 11/27/2015
Let me know what I can provide to help
CB
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