[Bug 94197] New: SAD counting bug inintel/linux-4.0.4/drivers/gpu/drm/drm_edid.c

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94197

            Bug ID: 94197
           Summary: SAD counting bug
                    inintel/linux-4.0.4/drivers/gpu/drm/drm_edid.c
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: artur999555 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 121817
  --> https://bugs.freedesktop.org/attachment.cgi?id=121817&action=edit
EDID captured from Krell using OpenELEC/Kodi instructions

I have a Krell Foundation non-4K which has a strange EDID.  It does not have
one audio block with multiple SAD within it as do Marantz receivers but rather
it has several audio blocks, one after another.

When I connect the Foundation to an Asrock Beebox running OpenELEC the ELD data
structure ends up with only one element.

I think that is because of these lines of code starting at line 3157 in
intel/linux-4.0.4/drivers/gpu/drm/drm_edid.c

 case AUDIO_BLOCK:
 /* Audio Data Block, contains SADs */
 sad_count = dbl / 3;
 if (dbl >= 1)
     memcpy(eld + 20 + mnl, &db[1], dbl);
 break;

For the Krell, the sad_count would need to be incremented instead of just set
to the value from the EDID.  I do not know how this code would keep all the
audio blocks in such a fashion.

Now, if you tell me that the Foundation is doing this incorrectly I am more
than willing to report that to Krell. ;-)

Krill Foundation manual:
http://krellonline.com/downloads/FoundationProcessorOwnersReference_web.pdf

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