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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