drm: bridge: Pass drm_display_info to drm_bridge_funcs .mode_valid()

When validating a mode, bridges may need to do so in the context of a
display, as specified by drm_display_info. An example is the meson
dw-hdmi bridge that needs to consider the YUV 4:2:0 output format to
perform clock calculations.

Bridges that need the display info currently retrieve it from the
drm_connector created by the bridge. This gets in the way of moving
connector creation out of bridge drivers. To make this possible, pass
the drm_display_info to drm_bridge_funcs .mode_valid().

Changes to the bridge drivers have been performed with the following
coccinelle semantic patch and have been compile-tested.

@ rule1 @
identifier funcs;
identifier fn;
@@
 struct drm_bridge_funcs funcs = {
 	...,
 	.mode_valid = fn
 };

@ depends on rule1 @
identifier rule1.fn;
identifier bridge;
identifier mode;
@@
 enum drm_mode_status fn(
 	struct drm_bridge *bridge,
+	const struct drm_display_info *info,
 	const struct drm_display_mode *mode
 )
 {
 	...
 }

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Guido Günther <agx@sigxcpu.org> # for the nwl-dsi part:
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200526011505.31884-11-laurent.pinchart+renesas@ideasonboard.com

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index a1898c58ae3c..f68c69a45752 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -506,7 +506,8 @@ static enum drm_mode_status mode_valid_path(struct drm_connector *connector,
 	}
 
 	bridge = drm_bridge_chain_get_first_bridge(encoder);
-	ret = drm_bridge_chain_mode_valid(bridge, mode);
+	ret = drm_bridge_chain_mode_valid(bridge, &connector->display_info,
+					  mode);
 	if (ret != MODE_OK) {
 		DRM_DEBUG_ATOMIC("[BRIDGE] mode_valid() failed\n");
 		return ret;