Newer Tegra device-trees will specify a video output graph which involves
a bridge. This patch adds initial support for the DRM bridges to the Tegra
DRM output.
Acked-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/gpu/drm/tegra/drm.h | 2 ++
drivers/gpu/drm/tegra/output.c | 12 ++++++++++++
2 files changed, 14 insertions(+)
diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index b25443255be6..f38de08e0c95 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -12,6 +12,7 @@
#include <linux/gpio/consumer.h>
#include <drm/drm_atomic.h>
+#include <drm/drm_bridge.h>
#include <drm/drm_edid.h>
#include <drm/drm_encoder.h>
#include <drm/drm_fb_helper.h>
@@ -116,6 +117,7 @@ struct tegra_output {
struct device_node *of_node;
struct device *dev;
+ struct drm_bridge *bridge;
struct drm_panel *panel;
struct i2c_adapter *ddc;
const struct edid *edid;
diff --git a/drivers/gpu/drm/tegra/output.c b/drivers/gpu/drm/tegra/output.c
index a6a711d54e88..ccd1421f1b24 100644
--- a/drivers/gpu/drm/tegra/output.c
+++ b/drivers/gpu/drm/tegra/output.c
@@ -5,6 +5,7 @@
*/
#include <drm/drm_atomic_helper.h>
+#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_simple_kms_helper.h>
@@ -99,8 +100,19 @@ int tegra_output_probe(struct tegra_output *output)
if (!output->of_node)
output->of_node = output->dev->of_node;
+ err = drm_of_find_panel_or_bridge(output->of_node, -1, -1,
+ &output->panel, &output->bridge);
+ if (err && err != -ENODEV)
+ return err;
+
panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
if (panel) {
+ /*
+ * Don't mix nvidia,panel phandle with the graph in a
+ * device-tree.
+ */
+ WARN_ON(output->panel || output->bridge);
+
output->panel = of_drm_find_panel(panel);
of_node_put(panel);
--
2.27.0
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