[PATCH v2 1/2] drm/bridge: tc358767: Add format negotiation hooks for DPI/DSI to (e)DP

[Tomi Valkeinen]

From: Aradhya Bhatia <a-bhatia1@xxxxxx>

With new connector model, tc358767 will not create the connector, when
DRM_BRIDGE_ATTACH_NO_CONNECTOR is set and display-controller driver will
rely on format negotiation to setup the encoder format.

Add the missing bus format negotiation hooks in the
drm_bridge_funcs to complete DRM_BRIDGE_ATTACH_NO_CONNECTOR support.

Output format, for DPI/DSI to DP, is selected to
MEDIA_BUS_FMT_RGB888_1X24 as default, keeping in mind what the older
model used to support.

Reported-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Closes: https://lore.kernel.org/all/24282420-b4dd-45b3-bb1c-fc37fe4a8205@xxxxxxxxxxx/
Signed-off-by: Aradhya Bhatia <a-bhatia1@xxxxxx>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/bridge/tc358767.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index ef2e373606ba..89a0d804270a 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1726,6 +1726,7 @@ static void tc_edp_bridge_detach(struct drm_bridge *bridge)
 }
 
 #define MAX_INPUT_SEL_FORMATS	1
+#define MAX_OUTPUT_SEL_FORMATS	1
 
 static u32 *
 tc_dpi_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
@@ -1751,6 +1752,28 @@ tc_dpi_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
 	return input_fmts;
 }
 
+static u32 *
+tc_edp_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
+				  struct drm_bridge_state *bridge_state,
+				  struct drm_crtc_state *crtc_state,
+				  struct drm_connector_state *conn_state,
+				  unsigned int *num_output_fmts)
+{
+	u32 *output_fmts;
+
+	*num_output_fmts = 0;
+
+	output_fmts = kcalloc(MAX_OUTPUT_SEL_FORMATS, sizeof(*output_fmts),
+			      GFP_KERNEL);
+	if (!output_fmts)
+		return NULL;
+
+	output_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
+	*num_output_fmts = 1;
+
+	return output_fmts;
+}
+
 static const struct drm_bridge_funcs tc_dpi_bridge_funcs = {
 	.attach = tc_dpi_bridge_attach,
 	.mode_valid = tc_dpi_mode_valid,
@@ -1777,6 +1800,8 @@ static const struct drm_bridge_funcs tc_edp_bridge_funcs = {
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
+	.atomic_get_input_bus_fmts = drm_atomic_helper_bridge_propagate_bus_fmt,
+	.atomic_get_output_bus_fmts = tc_edp_atomic_get_output_bus_fmts,
 };
 
 static bool tc_readable_reg(struct device *dev, unsigned int reg)

-- 
2.34.1