[PATCH v2 45/60] drm/omap: dss: Add function to retrieve display for an output

[Laurent Pinchart]

Add a new omapdss_display_get() function to retrieve the omap_dss_device
for a given DSS output. This will be used when reversing the direction
of the DSS pipeline handling logic.

Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
 drivers/gpu/drm/omapdrm/dss/display.c | 9 +++++++++
 drivers/gpu/drm/omapdrm/dss/omapdss.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/omapdrm/dss/display.c b/drivers/gpu/drm/omapdrm/dss/display.c
index 65ca71859c7d..697dab0435d6 100644
--- a/drivers/gpu/drm/omapdrm/dss/display.c
+++ b/drivers/gpu/drm/omapdrm/dss/display.c
@@ -49,3 +49,12 @@ void omapdss_display_init(struct omap_dss_device *dssdev)
 					      "display%u", id);
 }
 EXPORT_SYMBOL_GPL(omapdss_display_init);
+
+struct omap_dss_device *omapdss_display_get(struct omap_dss_device *output)
+{
+	while (output->next)
+		output = output->next;
+
+	return omapdss_device_get(output);
+}
+EXPORT_SYMBOL_GPL(omapdss_display_get);
diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
index 723124f6e596..1d7263fc6077 100644
--- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
+++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
@@ -491,6 +491,7 @@ static inline bool omapdss_is_initialized(void)
 #define for_each_dss_display(d) \
 	while ((d = omapdss_device_get_next(d, true, false)) != NULL)
 void omapdss_display_init(struct omap_dss_device *dssdev);
+struct omap_dss_device *omapdss_display_get(struct omap_dss_device *output);
 
 void omapdss_device_register(struct omap_dss_device *dssdev);
 void omapdss_device_unregister(struct omap_dss_device *dssdev);
-- 
Regards,

Laurent Pinchart