drm/i915: re-init modeset hw state after gpu reset
After a gpu reset we need to re-init some of the hw state we only
initialize when modeset is enabled, like rc6, hw contexts or render/GT
core clock gating and workaround register settings.
Note that this patch has a small change in the resume code:
- rc6 on gen6+ is only restored for the modeset case (for more
consistency with other callsites). This is no problem because recent
kernels refuse to load drm/i915 without kms on gen6+
- rc6/emon on ilk is only restored for the modeset case. This is no
problem because rc6 is disabled by default on ilk, and ums on ilk
has never really been a supported option outside of horrible rhel
backports.
v2: Chris Wilson noticed that we not only fail to restore the clock
gating settings after gpu reset.
v3: Move the call to modeset_init_hw in _reset out of the
struct_mutext protected area - other callers don't hold it, too.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 743ec6b..aee389c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9530,6 +9530,23 @@
POSTING_READ(vga_reg);
}
+void intel_modeset_init_hw(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ intel_init_clock_gating(dev);
+
+ if (IS_IRONLAKE_M(dev)) {
+ ironlake_enable_drps(dev);
+ intel_init_emon(dev);
+ }
+
+ if (IS_GEN6(dev) || IS_GEN7(dev)) {
+ gen6_enable_rps(dev_priv);
+ gen6_update_ring_freq(dev_priv);
+ }
+}
+
void intel_modeset_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -9575,17 +9592,7 @@
i915_disable_vga(dev);
intel_setup_outputs(dev);
- intel_init_clock_gating(dev);
-
- if (IS_IRONLAKE_M(dev)) {
- ironlake_enable_drps(dev);
- intel_init_emon(dev);
- }
-
- if (IS_GEN6(dev) || IS_GEN7(dev)) {
- gen6_enable_rps(dev_priv);
- gen6_update_ring_freq(dev_priv);
- }
+ intel_modeset_init_hw(dev);
INIT_WORK(&dev_priv->idle_work, intel_idle_update);
setup_timer(&dev_priv->idle_timer, intel_gpu_idle_timer,