Bin confirmed that, with the patch ,the issue didn't exist now.
Need a reviewer so the patch can be lined up for merge.
Ville or anyone in cc list?
-Chandra

> -----Original Message-----
> From: Konduru, Chandra
> Sent: Monday, May 18, 2015 4:19 PM
> To: [email protected]
> Cc: Konduru, Chandra; Roper, Matthew D; Syrjala, Ville; Vetter, Daniel; Xu, 
> Bin A
> Subject: [PATCH] drm/i915/skl: don't fail colorkey + scaler request
> 
> There is a mplayer video failure reported with xv.
> This is because there is a request to do both plane scaling
> and colorkey. Because skl hw doesn't support plane scaling
> and colorkey at the same time, request is failed which is expected
> behavior.
> 
> To make xv operate, this patch allows colorkey continue to work
> without using scaler. Then behavior would be similar to platforms
> without plane scaler support.
> 
> Signed-off-by: Chandra Konduru <[email protected]>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90449
> ---
>  drivers/gpu/drm/i915/intel_display.c |   14 +++++++++-----
>  drivers/gpu/drm/i915/intel_sprite.c  |   31 +++++++++++++++++++++----------
>  2 files changed, 30 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index 7ab75c0..fc5cef0 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -4505,9 +4505,10 @@ skl_update_scaler_users(
>       }
> 
>       /* check colorkey */
> -     if (intel_plane && intel_plane->ckey.flags !=
> I915_SET_COLORKEY_NONE) {
> -             DRM_DEBUG_KMS("PLANE:%d scaling with color key not
> allowed",
> -                     intel_plane->base.base.id);
> +     if (WARN_ON(intel_plane &&
> +             intel_plane->ckey.flags != I915_SET_COLORKEY_NONE)) {
> +             DRM_DEBUG_KMS("PLANE:%d scaling %ux%u->%ux%u not
> allowed with colorkey",
> +                     intel_plane->base.base.id, src_w, src_h, dst_w, dst_h);
>               return -EINVAL;
>       }
> 
> @@ -13049,8 +13050,11 @@ intel_check_primary_plane(struct drm_plane
> *plane,
>               intel_atomic_get_crtc_state(state->base.state, intel_crtc) :
> NULL;
> 
>       if (INTEL_INFO(dev)->gen >= 9) {
> -             min_scale = 1;
> -             max_scale = skl_max_scale(intel_crtc, crtc_state);
> +             /* use scaler when colorkey is not required */
> +             if (to_intel_plane(plane)->ckey.flags ==
> I915_SET_COLORKEY_NONE) {
> +                     min_scale = 1;
> +                     max_scale = skl_max_scale(intel_crtc, crtc_state);
> +             }
>               can_position = true;
>       }
> 
> diff --git a/drivers/gpu/drm/i915/intel_sprite.c
> b/drivers/gpu/drm/i915/intel_sprite.c
> index 16d0e48..9004e47 100644
> --- a/drivers/gpu/drm/i915/intel_sprite.c
> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> @@ -775,7 +775,7 @@ intel_check_sprite_plane(struct drm_plane *plane,
>       struct drm_rect *dst = &state->dst;
>       const struct drm_rect *clip = &state->clip;
>       int hscale, vscale;
> -     int max_scale, min_scale;
> +     int max_scale, min_scale, can_scale;
>       int pixel_size;
>       int ret;
> 
> @@ -800,18 +800,29 @@ intel_check_sprite_plane(struct drm_plane *plane,
>               return -EINVAL;
>       }
> 
> +     /* setup can_scale, min_scale, max_scale */
> +     if (INTEL_INFO(dev)->gen >= 9) {
> +             /* use scaler when colorkey is not required */
> +             if (intel_plane->ckey.flags == I915_SET_COLORKEY_NONE) {
> +                     can_scale = 1;
> +                     min_scale = 1;
> +                     max_scale = skl_max_scale(intel_crtc, crtc_state);
> +             } else {
> +                     can_scale = 0;
> +                     min_scale = DRM_PLANE_HELPER_NO_SCALING;
> +                     max_scale = DRM_PLANE_HELPER_NO_SCALING;
> +             }
> +     } else {
> +             can_scale = intel_plane->can_scale;
> +             max_scale = intel_plane->max_downscale << 16;
> +             min_scale = intel_plane->can_scale ? 1 : (1 << 16);
> +     }
> +
>       /*
>        * FIXME the following code does a bunch of fuzzy adjustments to the
>        * coordinates and sizes. We probably need some way to decide
> whether
>        * more strict checking should be done instead.
>        */
> -     max_scale = intel_plane->max_downscale << 16;
> -     min_scale = intel_plane->can_scale ? 1 : (1 << 16);
> -
> -     if (INTEL_INFO(dev)->gen >= 9) {
> -             min_scale = 1;
> -             max_scale = skl_max_scale(intel_crtc, crtc_state);
> -     }
> 
>       drm_rect_rotate(src, fb->width << 16, fb->height << 16,
>                       state->base.rotation);
> @@ -882,7 +893,7 @@ intel_check_sprite_plane(struct drm_plane *plane,
>                        * Must keep src and dst the
>                        * same if we can't scale.
>                        */
> -                     if (!intel_plane->can_scale)
> +                     if (!can_scale)
>                               crtc_w &= ~1;
> 
>                       if (crtc_w == 0)
> @@ -894,7 +905,7 @@ intel_check_sprite_plane(struct drm_plane *plane,
>       if (state->visible && (src_w != crtc_w || src_h != crtc_h)) {
>               unsigned int width_bytes;
> 
> -             WARN_ON(!intel_plane->can_scale);
> +             WARN_ON(!can_scale);
> 
>               /* FIXME interlacing min height is 6 */
> 
> --
> 1.7.9.5

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