Implement .atomic_get_input_bus_fmts callback, which sets up the
input (DSI-end) format, and that format can then be used in pipeline
format negotiation between the DSI-end of this bridge and the other
component closer to the scanout engine.
Acked-by: Maxime Ripard <maxime@xxxxxxxxxx>
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
Cc: Maxime Ripard <maxime@xxxxxxxxxx>
Cc: Robert Foss <robert.foss@xxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
To: dri-devel@xxxxxxxxxxxxxxxxxxxxx
---
V2: Rebase on next-20220214
V3: Add AB from Maxime
---
drivers/gpu/drm/bridge/chipone-icn6211.c | 27 ++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/gpu/drm/bridge/chipone-icn6211.c b/drivers/gpu/drm/bridge/chipone-icn6211.c
index 095002a40d0e8..afc619e215c3b 100644
--- a/drivers/gpu/drm/bridge/chipone-icn6211.c
+++ b/drivers/gpu/drm/bridge/chipone-icn6211.c
@@ -389,6 +389,32 @@ static int chipone_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flag
return drm_bridge_attach(bridge->encoder, icn->panel_bridge, bridge, flags);
}
+#define MAX_INPUT_SEL_FORMATS 1
+
+static u32 *
+chipone_atomic_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)
+{
+ u32 *input_fmts;
+
+ *num_input_fmts = 0;
+
+ input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
+ GFP_KERNEL);
+ if (!input_fmts)
+ return NULL;
+
+ /* This is the DSI-end bus format */
+ input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
+ *num_input_fmts = 1;
+
+ return input_fmts;
+}
+
static const struct drm_bridge_funcs chipone_bridge_funcs = {
.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
@@ -398,6 +424,7 @@ static const struct drm_bridge_funcs chipone_bridge_funcs = {
.atomic_post_disable = chipone_atomic_post_disable,
.mode_set = chipone_mode_set,
.attach = chipone_attach,
+ .atomic_get_input_bus_fmts = chipone_atomic_get_input_bus_fmts,
};
static int chipone_parse_dt(struct chipone *icn)
--
2.34.1
