Op 26-05-17 om 17:15 schreef Mahesh Kumar:
> Don't trust cached DDB values. Recalculate the ddb value if cached value
> is zero.
>
> If i915 is build as a module, there may be a race condition when
> cursor_disable call comes even before intel_fbdev_initial_config.
> Which may lead to cached value being 0. And further commit will fail
> until a modeset.
>
> Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_pm.c | 15 ++++++++++-----
> 1 file changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 936eef1634c7..b67be1355e39 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3721,6 +3721,7 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
> struct drm_i915_private *dev_priv = to_i915(dev);
> struct drm_crtc *for_crtc = cstate->base.crtc;
> unsigned int pipe_size, ddb_size;
> + unsigned int active_crtcs;
> int nth_active_pipe;
>
> if (WARN_ON(!state) || !cstate->base.active) {
> @@ -3731,10 +3732,11 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
> }
>
> if (intel_state->active_pipe_changes)
> - *num_active = hweight32(intel_state->active_crtcs);
> + active_crtcs = intel_state->active_crtcs;
> else
> - *num_active = hweight32(dev_priv->active_crtcs);
> + active_crtcs = dev_priv->active_crtcs;
>
> + *num_active = hweight32(active_crtcs);
> ddb_size = INTEL_INFO(dev_priv)->ddb_size;
> WARN_ON(ddb_size == 0);
>
> @@ -3754,12 +3756,15 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
> * copy from old state to be sure
> */
> *alloc = to_intel_crtc_state(for_crtc->state)->wm.skl.ddb;
> - return;
> + if (!skl_ddb_entry_size(alloc))
> + DRM_DEBUG_KMS("Cached pipe DDB is 0 recalculate\n");
> + else
> + return;
> }
>
> - nth_active_pipe = hweight32(intel_state->active_crtcs &
> + nth_active_pipe = hweight32(active_crtcs &
> (drm_crtc_mask(for_crtc) - 1));
> - pipe_size = ddb_size / hweight32(intel_state->active_crtcs);
> + pipe_size = ddb_size / hweight32(active_crtcs);
> alloc->start = nth_active_pipe * ddb_size / *num_active;
> alloc->end = alloc->start + pipe_size;
> }
I'd love it if you also add a warning somewhere for active pipe with no ddb allocation to prevent this from reoccuring in the future. :)
But with the root cause being a invalid ddb allocation at boot, won't the below one liner should fix it too, but better?
I'l ltest it when f3-kbl becomes available again.
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a488e068c3d6..63a47909f618 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5051,7 +5051,7 @@ skl_compute_wm(struct drm_atomic_state *state)
*/
for_each_new_crtc_in_state(state, crtc, cstate, i)
changed = true;
- if (!changed)
+ if (!changed && !to_i915(state->dev)->wm.distrust_bios_wm)
return 0;
/* Clear all dirty flags */
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