[PATCH v3 1/6] drm: bridge: Propagate the bus flags from bridge->timings

[Nikhil Devshatwar]

bus_flags can be specified by a bridge in the timings.
If the bridge provides it, Override the bus_flags when propagating
from next bridge.

Signed-off-by: Nikhil Devshatwar <nikhil.nd at ti.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen at ti.com>
---

Notes:
    changes from v2:
    * update comment
    changes from v1:
    * Check for timings
    * Prioritize timings flags over next bridge's flags

 drivers/gpu/drm/drm_bridge.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 64f0effb52ac..13b67fc0dad3 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -975,6 +975,14 @@ drm_atomic_bridge_propagate_bus_flags(struct drm_bridge *bridge,
 	 * duplicate the "dummy propagation" logic.
 	 */
 	bridge_state->input_bus_cfg.flags = output_flags;
+
+	/*
+	 * If legacy bus flags are provided in bridge->timings, use those as
+	 * input flags instead of propagating the output flags.
+	 */
+	if (bridge->timings && bridge->timings->input_bus_flags)
+		bridge_state->input_bus_cfg.flags =
+			bridge->timings->input_bus_flags;
 }
 
 /**
-- 
2.17.1