drm/bridge: tfp410: Support format negotiation hooks

With new connector model, tfp410 will not create the connector and
SoC driver will rely on format negotiation to setup the encoder format.

Support format negotiations hooks in the drm_bridge_funcs.
Use helper functions for state management.

Input format is the one selected by the bridge from DT properties.

Signed-off-by: Nikhil Devshatwar <nikhil.nd@ti.com>
[a-bhatia1: Removed output fmt condition check]
Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230606082142.23760-2-a-bhatia1@ti.com

diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
index c06390da9ffd03f392f2be30b8070564a4f478cd..60960493afe708dfc1c3a14f78ce8f225076d568 100644 (file)
--- a/drivers/gpu/drm/bridge/ti-tfp410.c
+++ b/drivers/gpu/drm/bridge/ti-tfp410.c
@@ -206,12 +206,38 @@ static enum drm_mode_status tfp410_mode_valid(struct drm_bridge *bridge,
        return MODE_OK;
 }
 
+static u32 *tfp410_get_input_bus_fmts(struct drm_bridge *bridge,
+                                     struct drm_bridge_state *bridge_state,
+                                     struct drm_crtc_state *crtc_state,
+                                     struct drm_connector_state *conn_state,
+                                     u32 output_fmt,
+                                     unsigned int *num_input_fmts)
+{
+       struct tfp410 *dvi = drm_bridge_to_tfp410(bridge);
+       u32 *input_fmts;
+
+       *num_input_fmts = 0;
+
+       input_fmts = kzalloc(sizeof(*input_fmts), GFP_KERNEL);
+       if (!input_fmts)
+               return NULL;
+
+       *num_input_fmts = 1;
+       input_fmts[0] = dvi->bus_format;
+
+       return input_fmts;
+}
+
 static const struct drm_bridge_funcs tfp410_bridge_funcs = {
        .attach         = tfp410_attach,
        .detach         = tfp410_detach,
        .enable         = tfp410_enable,
        .disable        = tfp410_disable,
        .mode_valid     = tfp410_mode_valid,
+       .atomic_reset = drm_atomic_helper_bridge_reset,
+       .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+       .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+       .atomic_get_input_bus_fmts = tfp410_get_input_bus_fmts,
 };
 
 static const struct drm_bridge_timings tfp410_default_timings = {