drm: add a helper function to extract 'de-active' and 'pixelclk-active' from DT

add a helper function to extract information about pixel clock and DE
polarity from DT for use by of_get_drm_display_mode().
While at it, convert spaces to tabs in indentation in drm_modes.h.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

2 files changed, 17 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index fc5040ae5f25..51804e5c58b9 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -657,6 +657,21 @@ void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
 }
 EXPORT_SYMBOL_GPL(drm_display_mode_to_videomode);
 
+void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags)
+{
+        *bus_flags = 0;
+        if (vm->flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
+                *bus_flags |= DRM_BUS_FLAG_PIXDATA_POSEDGE;
+        if (vm->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+                *bus_flags |= DRM_BUS_FLAG_PIXDATA_NEGEDGE;
+
+        if (vm->flags & DISPLAY_FLAGS_DE_LOW)
+                *bus_flags |= DRM_BUS_FLAG_DE_LOW;
+        if (vm->flags & DISPLAY_FLAGS_DE_HIGH)
+                *bus_flags |= DRM_BUS_FLAG_DE_HIGH;
+}
+EXPORT_SYMBOL_GPL(drm_bus_flags_from_videomode);
+
 #ifdef CONFIG_OF
 /**
  * of_get_drm_display_mode - get a drm_display_mode from devicetree
diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
index ff481770d76b..a8164d2336e6 100644
--- a/include/drm/drm_modes.h
+++ b/include/drm/drm_modes.h
@@ -434,7 +434,7 @@ struct drm_cmdline_mode;
 struct drm_display_mode *drm_mode_create(struct drm_device *dev);
 void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode);
 void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
-                               const struct drm_display_mode *in);
+                               const struct drm_display_mode *in);
 int drm_mode_convert_umode(struct drm_display_mode *out,
                            const struct drm_mode_modeinfo *in);
 void drm_mode_probed_add(struct drm_connector *connector, struct drm_display_mode *mode);
@@ -457,6 +457,7 @@ void drm_display_mode_from_videomode(const struct videomode *vm,
                                      struct drm_display_mode *dmode);
 void drm_display_mode_to_videomode(const struct drm_display_mode *dmode,
                                    struct videomode *vm);
+void drm_bus_flags_from_videomode(const struct videomode *vm, u32 *bus_flags);
 int of_get_drm_display_mode(struct device_node *np,
                             struct drm_display_mode *dmode,
                             int index);