[Bug 85977] [BYT DSI PMIC backlight] Backlight support for Dell Venue 8 Pro

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85977

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[BYT] Backlight support for |[BYT DSI PMIC backlight]
                   |Dell Venue 8 Pro            |Backlight support for Dell
                   |                            |Venue 8 Pro
         Resolution|---                         |FIXED
             Status|NEEDINFO                    |RESOLVED

--- Comment #38 from Jani Nikula <jani.nikula at intel.com> ---
This bug is about PMIC backlight control. The code to support this, both on BYT
and CHV, has been upstream for a while now, so I'm closing the bug. Thanks for
the report.

There still remains the issue with probe ordering: if i915 gets probed before
all the related pmic/i2c drivers, pwm_get() fails as described in comment #32.
If you want to file a new bug for that, I don't mind.

As a workaround, these config options worked for me on Surface 3 PMIC
backlight:

CONFIG_PWM=y
CONFIG_PWM_CRC=y
CONFIG_I2C_DESIGNWARE_PLATFORM=y
CONFIG_I2C_DESIGNWARE_PCI=y
CONFIG_INTEL_SOC_PMIC=y
CONFIG_DRM_I915=m

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