[Bug 33542] New: radeon: Don't read BIOS in VRAM on SPARC64

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=33542

           Summary: radeon: Don't read BIOS in VRAM on SPARC64
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.39-rc3
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: detringj@gmail.com
        Regression: No


Created an attachment (id=54572)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=54572)
DRM and Radeon dmesg block containing kernel panic.

Hi!

Hurray!  Radeon KMS works again on SPARC64!  Almost.

Test platform is a Sun Ultra 45.  Test board is a Sun XVR-300 (RV380
0x1002:0x5B64) on a PCI-e bus.

There's a kernel panic when calling igp_read_bios_from_vram() from
radeon_get_bios().  See attached dmesg capture.

Patching around it with

--- a/drivers/gpu/drm/radeon/radeon_bios.c      2011-04-17 19:31:04.000000000
-0500
+++ b/drivers/gpu/drm/radeon/radeon_bios.c      2010-09-28 20:01:22.000000000
-0500
@@ -432,8 +432,10 @@
        uint16_t tmp;

        r = radeon_atrm_get_bios(rdev);
+#if !defined(__sparc__)
        if (r == false)
                r = igp_read_bios_from_vram(rdev);
+#endif /* !__sparc__ */
        if (r == false)
                r = radeon_read_bios(rdev);
        if (r == false) {


gives me a framebuffer console again.  After which, the usual desktop stack
works as well (X11, mesa, textured video).

I'm not sure this is the correct way to code the fix, stylistically speaking. 
Although I don't know of any sparc64 machines sporting a Radeon IGP, I'm sure
it could happen someday.  It also seems other architectures might run into this
as well.

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