Finding the right input bus format throughout the pipeline is hard
so add atomic_get_input_bus_fmts callback and initialize with the
default RGB888_1X24 bus format on DSI-end.
This format can be used in pipeline for negotiating bus format between
the DSI-end of this bridge and the other component closer to pipeline
components.
v1:
* new patch
Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/samsung-dsim.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c
index 38db1f93ed51..02802526f82f 100644
--- a/drivers/gpu/drm/bridge/samsung-dsim.c
+++ b/drivers/gpu/drm/bridge/samsung-dsim.c
@@ -1338,6 +1338,32 @@ static void samsung_dsim_atomic_post_disable(struct drm_bridge *bridge,
pm_runtime_put_sync(dsi->dev);
}
+#define MAX_INPUT_SEL_FORMATS 1
+
+static u32 *
+samsung_dsim_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 int samsung_dsim_atomic_check(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
@@ -1372,6 +1398,7 @@ static const struct drm_bridge_funcs samsung_dsim_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 = samsung_dsim_atomic_get_input_bus_fmts,
.atomic_check = samsung_dsim_atomic_check,
.atomic_pre_enable = samsung_dsim_atomic_pre_enable,
.atomic_enable = samsung_dsim_atomic_enable,
--
2.25.1
