[PATCH v2 3/8] drm: Add drm_encoder_mode_valid()

[Jose Abreu]

Add a new helper to call encoder->mode_valid callback.

Suggested-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Jose Abreu <joabreu at synopsys.com>
Cc: Carlos Palminha <palminha at synopsys.com>
Cc: Alexey Brodkin <abrodkin at synopsys.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Dave Airlie <airlied at linux.ie>
Cc: Andrzej Hajda <a.hajda at samsung.com>
Cc: Archit Taneja <architt at codeaurora.org>
---
 drivers/gpu/drm/drm_crtc_internal.h |  2 ++
 drivers/gpu/drm/drm_encoder.c       | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/drm_crtc_internal.h b/drivers/gpu/drm/drm_crtc_internal.h
index 3800abd..6165bc9 100644
--- a/drivers/gpu/drm/drm_crtc_internal.h
+++ b/drivers/gpu/drm/drm_crtc_internal.h
@@ -129,6 +129,8 @@ int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
 /* drm_encoder.c */
 int drm_encoder_register_all(struct drm_device *dev);
 void drm_encoder_unregister_all(struct drm_device *dev);
+enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder,
+					    const struct drm_display_mode *mode);
 
 /* IOCTL */
 int drm_mode_getencoder(struct drm_device *dev,
diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index 0708779..af75f42 100644
--- a/drivers/gpu/drm/drm_encoder.c
+++ b/drivers/gpu/drm/drm_encoder.c
@@ -23,6 +23,7 @@
 #include <linux/export.h>
 #include <drm/drmP.h>
 #include <drm/drm_encoder.h>
+#include <drm/drm_modeset_helper_vtables.h>
 
 #include "drm_crtc_internal.h"
 
@@ -239,3 +240,25 @@ int drm_mode_getencoder(struct drm_device *dev, void *data,
 
 	return 0;
 }
+
+/**
+ * drm_encoder_mode_valid - call encoder->mode_valid callback, if any.
+ * @encoder: encoder
+ * @mode: mode to be validated
+ *
+ * If no mode_valid callback is available this will return MODE_OK.
+ *
+ * Returns: drm_mode_status Enum
+ */
+enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder,
+					    const struct drm_display_mode *mode)
+{
+	const struct drm_encoder_helper_funcs *encoder_funcs =
+		encoder->helper_private;
+
+	if (!encoder_funcs || !encoder_funcs->mode_valid)
+		return MODE_OK;
+
+	return encoder_funcs->mode_valid(encoder, mode);
+}
+EXPORT_SYMBOL(drm_encoder_mode_valid);
-- 
1.9.1