[Bug 66963] r600: linux 3.11RC isn't booting with radeon.dpm=1 option in grub

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66963

--- Comment #7 from Sergey <orbitgray at ukr.net> ---
Some findings:

The actual hand happens in
drivers/gpu/drm/radeon/rv6xx_dpm.c:
int rv6xx_dpm_enable(struct radeon_device *rdev)
on 'r600_start_dpm(rdev)' call.
Makes sense that configurations are harmless before actual dpm is enabled.

>From this function it looks like we disable sclk and mclk do pll configuration,
then enable clocks back. But even if I leave:
void r600_start_dpm(struct radeon_device *rdev)
{
        r600_enable_sclk_control(rdev, false);
        r600_enable_mclk_control(rdev, false);

        r600_enable_sclk_control(rdev, true);
        r600_enable_mclk_control(rdev, true);
}
System still fails with black screen.

There is also peace of code in r600_start_dpm() that is duplicated:
         r600_enable_spll_bypass(rdev, true);
         r600_wait_for_spll_change(rdev);
         r600_enable_spll_bypass(rdev, false);
         r600_wait_for_spll_change(rdev);

         r600_enable_spll_bypass(rdev, true);
         r600_wait_for_spll_change(rdev);
         r600_enable_spll_bypass(rdev, false);
         r600_wait_for_spll_change(rdev);
(probably this intentional, just checking)

Sorry if it doesn't make any sense, I'm new with radeon driver and don't know
how 'dpm' is supposed to work for this HW.

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