[Bug 89164] AMD Kaveri: gbm_bo_get_stride returns wrong values for cursor buffers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89164

            Bug ID: 89164
           Summary: AMD Kaveri: gbm_bo_get_stride returns wrong values for
                    cursor buffers
           Product: Mesa
           Version: 10.4
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: andreas.pokorny at gmail.com
        QA Contact: dri-devel at lists.freedesktop.org

When creating a cursor with GBM_BO_USE_CURSOR{_64x64} and a dimension of 64 by
64 pixel the operation succeeds and the returned stride size is always 256.
When drawing the cursor buffer and displaying on screen graphical artifacts
appear. Instead of 128 bytes a stride size of 512 seems to be correct on Kaveri
systems. 

For this particular scenario there is a workaround: query 'an arbitrary but
valid cursor buffer size' with DRM_CAP_CURSOR_WIDTH DRM_CAP_CURSOR_HEIGHT.

Still gbm_bo_get_stride should not return a wrong stride size.

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