[PATCH v3 12/26] drm/i915/writeback: Define compute_config for writeback

[Suraj Kandpal <suraj.kandpal@intel.com>]

Define the compute config function where we assign the output_type
and add the transcoder that needs to be used. We currently assign
one WD0 transcoder.

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
---
 .../gpu/drm/i915/display/intel_writeback.c    | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_writeback.c b/drivers/gpu/drm/i915/display/intel_writeback.c
index 4a40fda639ca..b9350d97de09 100644
--- a/drivers/gpu/drm/i915/display/intel_writeback.c
+++ b/drivers/gpu/drm/i915/display/intel_writeback.c
@@ -171,6 +171,25 @@ static const struct drm_connector_helper_funcs conn_helper_funcs = {
 	.cleanup_writeback_job = intel_writeback_cleanup_job,
 };
 
+static int
+intel_writeback_compute_config(struct intel_encoder *encoder,
+			       struct intel_crtc_state *pipe_config,
+			       struct drm_connector_state *conn_state)
+{
+	struct intel_display *display = to_intel_display(encoder);
+
+	if (!conn_state->writeback_job)
+		return 0;
+
+	if (HAS_TRANSCODER(display, TRANSCODER_WD_0))
+		pipe_config->cpu_transcoder = TRANSCODER_WD_0;
+
+	pipe_config->output_types |= BIT(INTEL_OUTPUT_WRITEBACK);
+	pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
+
+	return 0;
+}
+
 static void
 intel_writeback_get_config(struct intel_encoder *encoder,
 			   struct intel_crtc_state *crtc_state)
@@ -251,6 +270,7 @@ int intel_writeback_init(struct intel_display *display)
 	encoder->cloneable = 0;
 	encoder->get_config = intel_writeback_get_config;
 	encoder->get_hw_state = intel_writeback_get_hw_state;
+	encoder->compute_config = intel_writeback_compute_config;
 
 	connector = &writeback_conn->connector;
 	ret = intel_writeback_connector_alloc(connector);
-- 
2.34.1