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.
Output format is expected to be MEDIA_BUS_FMT_FIXED
Input format is the one selected by the bridge from DT properties.
Signed-off-by: Nikhil Devshatwar <nikhil.nd@xxxxxx>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
Notes:
changes from v1:
* Use only MEDIA_BUS_FMT_FIXED for output
drivers/gpu/drm/bridge/ti-tfp410.c | 33 ++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
index ba3fa2a9b8a4..3def9acba86b 100644
--- a/drivers/gpu/drm/bridge/ti-tfp410.c
+++ b/drivers/gpu/drm/bridge/ti-tfp410.c
@@ -204,12 +204,45 @@ 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;
+
+ /*
+ * Output of tfp410 is DVI, which is TMDS.
+ * There is no media format defined for this.
+ * Using MEDIA_BUS_FMT_FIXED for now.
+ */
+ if (output_fmt != MEDIA_BUS_FMT_FIXED)
+ return NULL;
+
+ 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 = {
--
2.17.1
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