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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>
          <br>
             <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>
         </tr></table>
      <p>
        <div>
            <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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