On Fri, Jun 5, 2015 at 1:33 PM, j.glisse@gmail.com wrote:
From: Jérôme Glisse jglisse@redhat.com
Laptop with Turks/Thames GPU will freeze if dpm is enabled. It seems the SMC engine is relying on some state inside the CP engine. CP needs to chew at least one packet for it to get in good state for dynamic power management.
This patch simply disabled and re-enable DPM after the ring test which is enough to avoid the freeze.
Signed-off-by: Jérôme Glisse jglisse@redhat.com Cc: stable@vger.kernel.org
Applied. thanks!
Alex
drivers/gpu/drm/radeon/radeon_device.c | 15 +++++++++++++++ 1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c index b7ca4c5..a7fdfa4 100644 --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -1463,6 +1463,21 @@ int radeon_device_init(struct radeon_device *rdev, if (r) DRM_ERROR("ib ring test failed (%d).\n", r);
/** Turks/Thames GPU will freeze whole laptop if DPM is not restarted* after the CP ring have chew one packet at least. Hence here we stop* and restart DPM after the radeon_ib_ring_tests().*/if (rdev->pm.dpm_enabled &&(rdev->pm.pm_method == PM_METHOD_DPM) &&(rdev->family == CHIP_TURKS) &&(rdev->flags & RADEON_IS_MOBILITY)) {mutex_lock(&rdev->pm.mutex);radeon_dpm_disable(rdev);radeon_dpm_enable(rdev);mutex_unlock(&rdev->pm.mutex);}if ((radeon_testing & 1)) { if (rdev->accel_working) radeon_test_moves(rdev);-- 1.7.1
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