[Bug 88921] X fails to start on QEMU/KVM with cirrus KMS since 3.19-rc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88921

            Bug ID: 88921
           Summary: X fails to start on QEMU/KVM with cirrus KMS since
                    3.19-rc
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/other
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: tiwai at suse.de

X modesetting driver fails to start with cirrus KMS on QEMU/KVM since 3.19-rc.
The culprit is the commit 8975626ea35adcca561f8a81dedccfbc5dd8ec72
    drm/cirrus: allow 32bpp framebuffers for cirrus drm

Reverting this commit makes X working again.

X modesetting driver seems to try to open 1024x768x32 graphics, where the pitch
is 4096 and greater than max_pitch (4088) defined in
cirrus_check_framebuffer().
And it doesn't fall back to 24bpp as the patch expected.

Tested with 3.19-rc7 with qemu 2.1 -vga cirrus option.

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