[PATCH v2 2/2] drm/i2c/tda998x: Implement atomic_get_input_bus_fmts

[Fabio Estevam]

Implement the .atomic_get_input_bus_fmts callback to let the bridge
indicate the pixel format it requires on the parallel bus to the LCDIF.

Based on Marek's commit db8b7ca5b232 ("drm/bridge: ti-sn65dsi83: Replace
connector format patching with atomic_get_input_bus_fmts").

Tested on a imx6sx-udoo-neo board.

Suggested-by: Marek Vasut <marex at denx.de>
Signed-off-by: Fabio Estevam <festevam at gmail.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
Changes since v1:

- Move .atomic_duplicate_state,.atomic_destroy_state .atomic_reset from
patch 2/2 to 1/2. (Laurent)

 drivers/gpu/drm/i2c/tda998x_drv.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 45d52b8a4026..d987481e97c1 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -1678,6 +1678,31 @@ static void tda998x_bridge_mode_set(struct drm_bridge *bridge,
 	mutex_unlock(&priv->audio_mutex);
 }
 
+#define MAX_INPUT_SEL_FORMATS  1
+
+static u32 *
+tda998x_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;
+
+	input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
+	*num_input_fmts = 1;
+
+	return input_fmts;
+}
+
 static const struct drm_bridge_funcs tda998x_bridge_funcs = {
 	.attach = tda998x_bridge_attach,
 	.detach = tda998x_bridge_detach,
@@ -1688,6 +1713,7 @@ static const struct drm_bridge_funcs tda998x_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 = tda998x_atomic_get_input_bus_fmts,
 };
 
 /* I2C driver functions */
-- 
2.25.1