[PATCH 2/2] nouveau: wrap the output poll execution and wakeup gpu

[Dave Airlie]

From: Dave Airlie <airl...@redhat.com>

This wraps the output poll and fixes a problem where
pm resume would try and take the mode config mutex
but the output poll thread would already have taken it.

I found this while looking for another bug, I've no idea
yet if this fixes that problem.

Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 drivers/gpu/drm/nouveau/nv50_display.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/nouveau/nv50_display.c 
b/drivers/gpu/drm/nouveau/nv50_display.c
index cb85cb7..75502cd 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.c
+++ b/drivers/gpu/drm/nouveau/nv50_display.c
@@ -4323,10 +4323,26 @@ nv50_disp_atomic_state_alloc(struct drm_device *dev)
        return &atom->state;
 }

+static bool
+nv50_disp_output_poll_execute(struct drm_device *dev)
+{
+       int ret;
+       bool repoll;
+       ret = pm_runtime_get_sync(dev->dev);
+       if (ret < 0 && ret != -EACCES)
+               return true;
+
+       repoll = drm_kms_helper_poll_outputs(dev);
+       pm_runtime_mark_last_busy(dev->dev);
+       pm_runtime_put_autosuspend(dev->dev);
+       return repoll;
+}
+
 static const struct drm_mode_config_funcs
 nv50_disp_func = {
        .fb_create = nouveau_user_framebuffer_create,
        .output_poll_changed = nouveau_fbcon_output_poll_changed,
+       .output_poll_execute = nv50_disp_output_poll_execute,
        .atomic_check = nv50_disp_atomic_check,
        .atomic_commit = nv50_disp_atomic_commit,
        .atomic_state_alloc = nv50_disp_atomic_state_alloc,
-- 
2.9.3