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<body><span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BYT DSI PMIC backlight] Backlight support for Dell Venue 8 Pro"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85977">bug 85977</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Summary</td>
<td>[BYT] Backlight support for Dell Venue 8 Pro
</td>
<td>[BYT DSI PMIC backlight] Backlight support for Dell Venue 8 Pro
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEEDINFO
</td>
<td>RESOLVED
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BYT DSI PMIC backlight] Backlight support for Dell Venue 8 Pro"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85977#c38">Comment # 38</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BYT DSI PMIC backlight] Backlight support for Dell Venue 8 Pro"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85977">bug 85977</a>
from <span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span></b>
<pre>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 <a href="show_bug.cgi?id=85977#c32">comment #32</a>.
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</pre>
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