[PATCH 4/9] drm/bridge: synopsys: dw-mipi-dsi: Add mode fixup support

[Liu Ying <victor.liu@nxp.com>]

Vendor drivers may need to fixup mode due to pixel clock tree limitation,
so introduce the ->mode_fixup() callcack to struct dw_mipi_dsi_plat_data
and call it at atomic check stage if available.

Signed-off-by: Liu Ying <victor.liu@nxp.com>
---
 drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 14 ++++++++++++++
 include/drm/bridge/dw_mipi_dsi.h              |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index 8cd89a63b5f2..c754d55f71d1 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -571,9 +571,23 @@ static int dw_mipi_dsi_bridge_atomic_check(struct drm_bridge *bridge,
 					   struct drm_crtc_state *crtc_state,
 					   struct drm_connector_state *conn_state)
 {
+	struct dw_mipi_dsi *dsi = bridge_to_dsi(bridge);
+	const struct dw_mipi_dsi_plat_data *pdata = dsi->plat_data;
+	bool ret;
+
 	bridge_state->input_bus_cfg.flags =
 		DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
 
+	if (pdata->mode_fixup) {
+		ret = pdata->mode_fixup(pdata->priv_data, &crtc_state->mode,
+					&crtc_state->adjusted_mode);
+		if (!ret) {
+			DRM_DEBUG_DRIVER("failed to fixup mode " DRM_MODE_FMT "\n",
+					 DRM_MODE_ARG(&crtc_state->mode));
+			return -EINVAL;
+		}
+	}
+
 	return 0;
 }
 
diff --git a/include/drm/bridge/dw_mipi_dsi.h b/include/drm/bridge/dw_mipi_dsi.h
index 246650f2814f..65d5e68065e3 100644
--- a/include/drm/bridge/dw_mipi_dsi.h
+++ b/include/drm/bridge/dw_mipi_dsi.h
@@ -59,6 +59,9 @@ struct dw_mipi_dsi_plat_data {
 					   unsigned long mode_flags,
 					   u32 lanes, u32 format);
 
+	bool (*mode_fixup)(void *priv_data, const struct drm_display_mode *mode,
+			   struct drm_display_mode *adjusted_mode);
+
 	u32 *(*get_input_bus_fmts)(void *priv_data,
 				   struct drm_bridge *bridge,
 				   struct drm_bridge_state *bridge_state,
-- 
2.37.1