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Date: Thu, 25 Jun 2015 11:02:49 +0100 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Jérôme Glisse <jglisse@...hat.com>, Alex Deucher <alexander.deucher@....com>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 3.16.y-ckt 70/71] drm/radeon: fix freeze for laptop with Turks/Thames GPU. 3.16.7-ckt14 -stable review patch. If anyone has any objections, please let me know. ------------------ From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= <jglisse@...hat.com> commit 6dfd197283bffc23a2b046a7f065588de7e1fc1e upstream. 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@...hat.com> Signed-off-by: Alex Deucher <alexander.deucher@....com> [ luis: backported to 3.16: adjusted context ] Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- 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 d024389c4272..e5ed5ee9d832 100644 --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -1374,6 +1374,21 @@ int radeon_device_init(struct radeon_device *rdev, goto failed; } + /* + * 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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