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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Warnings on suspend/resume: CSR SSP Base Not fine, CSR HTP Not fine, DC6 already programmed to be disabled"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=92935">92935</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Warnings on suspend/resume: CSR SSP Base Not fine, CSR HTP Not fine, DC6 already programmed to be disabled
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>DRI git
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Intel
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>timur.alperovich@gmail.com
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr></table>
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        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=119626" name="attach_119626" title="dmesg output">attachment 119626</a> <a href="attachment.cgi?id=119626&action=edit" title="dmesg output">[details]</a></span>
dmesg output

I noticed the following error in dmesg when suspending/resuming:
[  264.289328] Trying to free nonexistent resource
<000000000000e000-000000000000e0ff>
[  264.289489] PM: suspend of devices complete after 163.064 msecs
[  264.289896] ------------[ cut here ]------------
[  264.289941] WARNING: CPU: 0 PID: 1814 at
drivers/gpu/drm/i915/intel_runtime_pm.c:465 skl_enable_dc6+0x1dc/0x2d0 [i915]()
[  264.289943] CSR SSP Base Not fine
[  264.290316] WARNING: CPU: 0 PID: 1814 at
drivers/gpu/drm/i915/intel_runtime_pm.c:466 skl_enable_dc6+0x20d/0x2d0 [i915]()
[  264.290317] CSR HTP Not fine
[  265.329897] WARNING: CPU: 1 PID: 1864 at
drivers/gpu/drm/i915/intel_runtime_pm.c:558 skl_disable_dc6+0x93/0xc0 [i915]()
[  265.329898] DC6 already programmed to be disabled.

distribution: Debian (testing)
uname -m: x86_64
uname -r: drm-intel-nightly build; the last commit is: 4c2531304c0a
model: Dell XPS 9350 (i7-6500U)
no external display connected

dmesg debug output attached.</pre>
        </div>
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