[Bug 66963] r600: linux v3.11.0-RC 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 #138 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #137)
> Nope definitely not reliably, but I did have it work one more time doing the
> above (booting with modeset=0) after about 10 or so reboots.  When it fails
> I've never been able to get any debug information..
> 
> Any suggestions of other ways to get more debug information?

Does it hang the entire system as soon as you load the driver, or only when you
start X or something like that?

As for debugging, you can try disabling rv6xx_dpm_set_power_state() by
returning early (see the patch below).  If that works, move the the return
statement further and further down in the function until you can identify at
which point in rv6xx_dpm_set_power_state() the hang occurs.  Once we pin point
that, we can debug further.


diff --git a/drivers/gpu/drm/radeon/rv6xx_dpm.c
b/drivers/gpu/drm/radeon/rv6xx_dpm.c
index 5811d27..bfa2922 100644
--- a/drivers/gpu/drm/radeon/rv6xx_dpm.c
+++ b/drivers/gpu/drm/radeon/rv6xx_dpm.c
@@ -1670,6 +1670,8 @@ int rv6xx_dpm_set_power_state(struct radeon_device *rdev)
        struct radeon_ps *old_ps = rdev->pm.dpm.current_ps;
        int ret;

+       return 0;
+
        pi->restricted_levels = 0;

        rv6xx_set_uvd_clock_before_set_eng_clock(rdev, new_ps, old_ps);
@@ -2094,6 +2096,8 @@ int rv6xx_dpm_force_performance_level(struct
radeon_device *rdev,
 {
        struct rv6xx_power_info *pi = rv6xx_get_pi(rdev);

+       return 0;
+
        if (level == RADEON_DPM_FORCED_LEVEL_HIGH) {
                pi->restricted_levels = 3;
        } else if (level == RADEON_DPM_FORCED_LEVEL_LOW) {

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