From: Jérôme Glisse <jglisse@xxxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ Upstream commit 6dfd197283bffc23a2b046a7f065588de7e1fc1e ]
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@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon_device.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index bdf263a..5d54ab0 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -1426,6 +1426,21 @@ 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);
--
2.1.0
--
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