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 <ma...@denx.de>
Signed-off-by: Fabio Estevam <feste...@gmail.com>
---
 drivers/gpu/drm/i2c/tda998x_drv.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c 
b/drivers/gpu/drm/i2c/tda998x_drv.c
index adaa985af87e..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,
@@ -1685,6 +1710,10 @@ static const struct drm_bridge_funcs 
tda998x_bridge_funcs = {
        .atomic_disable = tda998x_bridge_atomic_disable,
        .mode_set = tda998x_bridge_mode_set,
        .atomic_enable = tda998x_bridge_atomic_enable,
+       .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

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