[PATCH 1/7] drm/bridge: Pass struct drm_bus_cfg to select_bus_fmt_recursive()

[Marek Vasut <marex@denx.de>]

Pass the entire struct drm_bus_cfg {} to select_bus_fmt_recursive()
instead of only u32 out_bus_fmt which contains only the pixel format.
This would permit passing more bus format data around during the
bridge-to-bridge format negotiation.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Maxime Ripard <maxime@cerno.tech>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
---
 drivers/gpu/drm/drm_bridge.c | 39 +++++++++++++++++++++++++-----------
 1 file changed, 27 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index c96847fc0ebcb..f052d50106758 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -821,11 +821,13 @@ static int select_bus_fmt_recursive(struct drm_bridge *first_bridge,
 				    struct drm_bridge *cur_bridge,
 				    struct drm_crtc_state *crtc_state,
 				    struct drm_connector_state *conn_state,
-				    u32 out_bus_fmt)
+				    struct drm_bus_cfg *out_bus_cfg)
 {
 	struct drm_bridge_state *cur_state;
 	unsigned int num_in_bus_fmts, i;
 	struct drm_bridge *prev_bridge;
+	struct drm_bus_cfg fixed_bus_cfg;
+	struct drm_bus_cfg *in_bus_cfgs;
 	u32 *in_bus_fmts;
 	int ret;
 
@@ -841,10 +843,11 @@ static int select_bus_fmt_recursive(struct drm_bridge *first_bridge,
 	 */
 	if (!cur_bridge->funcs->atomic_get_input_bus_fmts) {
 		if (cur_bridge != first_bridge) {
+			fixed_bus_cfg.format = MEDIA_BUS_FMT_FIXED;
 			ret = select_bus_fmt_recursive(first_bridge,
 						       prev_bridge, crtc_state,
 						       conn_state,
-						       MEDIA_BUS_FMT_FIXED);
+						       &fixed_bus_cfg);
 			if (ret)
 				return ret;
 		}
@@ -855,7 +858,7 @@ static int select_bus_fmt_recursive(struct drm_bridge *first_bridge,
 		 */
 		if (cur_state) {
 			cur_state->input_bus_cfg.format = MEDIA_BUS_FMT_FIXED;
-			cur_state->output_bus_cfg.format = out_bus_fmt;
+			cur_state->output_bus_cfg.format = out_bus_cfg->format;
 		}
 
 		return 0;
@@ -872,34 +875,44 @@ static int select_bus_fmt_recursive(struct drm_bridge *first_bridge,
 							cur_state,
 							crtc_state,
 							conn_state,
-							out_bus_fmt,
+							out_bus_cfg->format,
 							&num_in_bus_fmts);
 	if (!num_in_bus_fmts)
 		return -ENOTSUPP;
 	else if (!in_bus_fmts)
 		return -ENOMEM;
 
+	/* Transcribe in_bus_fmts to in_bus_cfgs */
+	in_bus_cfgs = kcalloc(num_in_bus_fmts, sizeof(*in_bus_cfgs), GFP_KERNEL);
+	if (!in_bus_cfgs)
+		return -ENOMEM;
+
+	for (i = 0; i < num_in_bus_fmts; i++)
+		in_bus_cfgs[i].format = in_bus_fmts[i];
+
+	kfree(in_bus_fmts);
+
 	if (first_bridge == cur_bridge) {
-		cur_state->input_bus_cfg.format = in_bus_fmts[0];
-		cur_state->output_bus_cfg.format = out_bus_fmt;
-		kfree(in_bus_fmts);
+		cur_state->input_bus_cfg.format = in_bus_cfgs[0].format;
+		cur_state->output_bus_cfg.format = out_bus_cfg->format;
+		kfree(in_bus_cfgs);
 		return 0;
 	}
 
 	for (i = 0; i < num_in_bus_fmts; i++) {
 		ret = select_bus_fmt_recursive(first_bridge, prev_bridge,
 					       crtc_state, conn_state,
-					       in_bus_fmts[i]);
+					       &(in_bus_cfgs[i]));
 		if (ret != -ENOTSUPP)
 			break;
 	}
 
 	if (!ret) {
-		cur_state->input_bus_cfg.format = in_bus_fmts[i];
-		cur_state->output_bus_cfg.format = out_bus_fmt;
+		cur_state->input_bus_cfg.format = in_bus_cfgs[i].format;
+		cur_state->output_bus_cfg.format = out_bus_cfg->format;
 	}
 
-	kfree(in_bus_fmts);
+	kfree(in_bus_cfgs);
 	return ret;
 }
 
@@ -947,6 +960,7 @@ drm_atomic_bridge_chain_select_bus_fmts(struct drm_bridge *bridge,
 	struct drm_bridge_state *last_bridge_state;
 	unsigned int i, num_out_bus_fmts;
 	struct drm_bridge *last_bridge;
+	struct drm_bus_cfg out_bus_cfg;
 	u32 *out_bus_fmts;
 	int ret = 0;
 
@@ -988,8 +1002,9 @@ drm_atomic_bridge_chain_select_bus_fmts(struct drm_bridge *bridge,
 	}
 
 	for (i = 0; i < num_out_bus_fmts; i++) {
+		out_bus_cfg.format = out_bus_fmts[i];
 		ret = select_bus_fmt_recursive(bridge, last_bridge, crtc_state,
-					       conn_state, out_bus_fmts[i]);
+					       conn_state, &out_bus_cfg);
 		if (ret != -ENOTSUPP)
 			break;
 	}
-- 
2.34.1