The PL111 needs to filter valid modes based on memory bandwidth.
I guess it is a pretty simple operation, so we can still claim
the DRM KMS helper pipeline is simple after adding this (optional)
vtable callback.

Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
---
 drivers/gpu/drm/drm_simple_kms_helper.c | 15 +++++++++++++++
 include/drm/drm_simple_kms_helper.h     | 15 +++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c 
b/drivers/gpu/drm/drm_simple_kms_helper.c
index dc9fd109de14..b7840cf34808 100644
--- a/drivers/gpu/drm/drm_simple_kms_helper.c
+++ b/drivers/gpu/drm/drm_simple_kms_helper.c
@@ -34,6 +34,20 @@ static const struct drm_encoder_funcs 
drm_simple_kms_encoder_funcs = {
        .destroy = drm_encoder_cleanup,
 };
 
+static enum drm_mode_status
+drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc,
+                              const struct drm_display_mode *mode)
+{
+       struct drm_simple_display_pipe *pipe;
+
+       pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
+       if (!pipe->funcs || !pipe->funcs->mode_valid)
+               /* Anything goes */
+               return MODE_OK;
+
+       return pipe->funcs->mode_valid(crtc, mode);
+}
+
 static int drm_simple_kms_crtc_check(struct drm_crtc *crtc,
                                     struct drm_crtc_state *state)
 {
@@ -72,6 +86,7 @@ static void drm_simple_kms_crtc_disable(struct drm_crtc *crtc,
 }
 
 static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs = {
+       .mode_valid = drm_simple_kms_crtc_mode_valid,
        .atomic_check = drm_simple_kms_crtc_check,
        .atomic_enable = drm_simple_kms_crtc_enable,
        .atomic_disable = drm_simple_kms_crtc_disable,
diff --git a/include/drm/drm_simple_kms_helper.h 
b/include/drm/drm_simple_kms_helper.h
index 6d9adbb46293..ad74cb33c539 100644
--- a/include/drm/drm_simple_kms_helper.h
+++ b/include/drm/drm_simple_kms_helper.h
@@ -21,6 +21,21 @@ struct drm_simple_display_pipe;
  *                                        display pipeline
  */
 struct drm_simple_display_pipe_funcs {
+       /**
+        * @mode_valid:
+        *
+        * This function is called to filter out valid modes from the
+        * suggestions suggested by the bridge or display. This optional
+        * hook is passed in when initializing the pipeline.
+        *
+        * RETURNS:
+        *
+        * MODE_OK if the mode is acceptable.
+        * MODE_BAD if we need to try something else.
+        */
+       enum drm_mode_status (*mode_valid)(struct drm_crtc *crtc,
+                                          const struct drm_display_mode *mode);
+
        /**
         * @enable:
         *
-- 
2.14.3

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