[Intel-gfx] [PATCH 2/4] drm/i915: Disallow D3Cold.

[Rodrigo Vivi]

During runtime or s2idle suspend and resume cases on discrete cards,
if D3Cold is really achieved, we will blow everything up and
freeze the machine because we are not yet handling the pci states
properly.

On Integrated it simply doesn't matter because D3hot is the maximum
that we will get anyway, unless the system is on S3/S4 and our power
is cut.

Let's put this hammer for now everywhere. So we can work to enable
the auto-suspend by default without blowing up the world.

Then, this should be removed when we finally fix the D3Cold flow.

Cc: Tilak Tangudu <tilak.tangudu at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index a40b5d806321..086a9a475ce8 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -301,6 +301,7 @@ static void sanitize_gpu(struct drm_i915_private *i915)
  */
 static int i915_driver_early_probe(struct drm_i915_private *dev_priv)
 {
+	struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
 	int ret = 0;
 
 	if (i915_inject_probe_failure(dev_priv))
@@ -331,6 +332,13 @@ static int i915_driver_early_probe(struct drm_i915_private *dev_priv)
 	if (ret < 0)
 		return ret;
 
+	/*
+	 * FIXME: Temporary hammer to avoid freezing the machine on our DGFX
+	 * This should be totally removed when we handle the pci states properly
+	 * on runtime PM and on s2idle cases.
+	 */
+	pci_d3cold_disable(pdev);
+
 	ret = vlv_suspend_init(dev_priv);
 	if (ret < 0)
 		goto err_workqueues;
-- 
2.31.1