Re: [PATCH v12 5/7] drm/i915/skl: Ensure pipes with changed wms get added to the state

[Mike Lothian <mike@xxxxxxxxxxxxxx>]

Hi

I've bisected back to this commit in the drm-intel-nightly branch

05a76d3d6ad1ee9f9814f88949cc9305fc165460 is the first bad commit
commit 05a76d3d6ad1ee9f9814f88949cc9305fc165460
Author: Lyude <cpaul@xxxxxxxxxx>
Date:   Wed Aug 17 15:55:57 2016 -0400

   drm/i915/skl: Ensure pipes with changed wms get added to the state

    
   If we're enabling a pipe, we'll need to modify the watermarks on all
   active planes. Since those planes won't be added to the state on
   their own, we need to add them ourselves.
    
   Signed-off-by: Lyude <cpaul@xxxxxxxxxx>
   Reviewed-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
   Cc: stable@xxxxxxxxxxxxxxx
   Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
   Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
   Cc: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
   Cc: Hans de Goede <hdegoede@xxxxxxxxxx>

   Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
   Link: http://patchwork.freedesktop.org/patch/msgid/1471463761-26796-6-git-send-email-cpaul@xxxxxxxxxx

The symptoms I'm seeing look like tearing at the top of the screen and it's especially noticeable in Chrome - reverting this commit makes the issue go away

Let me know if you'd like me to raise a bug

Cheers

Mike

On Wed, 17 Aug 2016 at 20:56 Lyude <cpaul@xxxxxxxxxx> wrote:

If we're enabling a pipe, we'll need to modify the watermarks on all
active planes. Since those planes won't be added to the state on
their own, we need to add them ourselves.

Signed-off-by: Lyude <cpaul@xxxxxxxxxx>
Reviewed-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
Cc: Hans de Goede <hdegoede@xxxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_pm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 849f039..a3d24cb 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4117,6 +4117,10 @@ skl_compute_ddb(struct drm_atomic_state *state)
                ret = skl_allocate_pipe_ddb(cstate, ddb);
                if (ret)
                        return ret;
+
+               ret = drm_atomic_add_affected_planes(state, &intel_crtc->base);
+               if (ret)
+                       return ret;
        }

        return 0;
--
2.7.4

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