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

[Mike Lothian <mike@fireburn.co.uk>]

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@redhat.com>
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@redhat.com>
   Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
   Cc: stable@vger.kernel.org
   Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
   Cc: Daniel Vetter <daniel.vetter@intel.com>
   Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
   Cc: Hans de Goede <hdegoede@redhat.com>
   Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
   Link: http://patchwork.freedesktop.org/patch/msgid/1471463761-26796-6-git-send-email-cpaul@redhat.com

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

(Re-sending from Gmail - as Inbox doesn't let me send as plain text)

On 17 August 2016 at 20:55, Lyude <cpaul@redhat.com> 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@redhat.com>
> Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
> Cc: stable@vger.kernel.org
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
> Cc: Hans de Goede <hdegoede@redhat.com>
> ---
>  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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