drm: mxsfb: Obtain bus flags from bridge state

In case the MXSFB is connected to a bridge, attempt to obtain bus flags
from that bridge state too. The bus flags may specify e.g. the DE signal
polarity.

Acked-by: Alexander Stein <[e-mail]>
Signed-off-by: Marek Vasut <[e-mail]>
Cc: Alexander Stein <[e-mail]>
Cc: Laurent Pinchart <[e-mail]>
Cc: Lucas Stach <[e-mail]>
Cc: Peng Fan <[e-mail]>
Cc: Robby Cai <[e-mail]>
Cc: Sam Ravnborg <[e-mail]>
Cc: Stefan Agner <[e-mail]>
Reviewed-by: Lucas Stach <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/mxsfb/mxsfb_kms.c

···
 }
 
 static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb,
+				     struct drm_bridge_state *bridge_state,
 				     const u32 bus_format)
 {
 	struct drm_device *drm = mxsfb->crtc.dev;
···
 
 	if (mxsfb->bridge && mxsfb->bridge->timings)
 		bus_flags = mxsfb->bridge->timings->input_bus_flags;
+	else if (bridge_state)
+		bus_flags = bridge_state->input_bus_cfg.flags;
 
 	DRM_DEV_DEBUG_DRIVER(drm->dev, "Pixel clock: %dkHz (actual: %dkHz)\n",
 			     m->crtc_clock,
···
 	struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev);
 	struct drm_plane_state *new_pstate = drm_atomic_get_new_plane_state(state,
 									    crtc->primary);
-	struct drm_bridge_state *bridge_state;
+	struct drm_bridge_state *bridge_state = NULL;
 	struct drm_device *drm = mxsfb->drm;
 	u32 bus_format = 0;
 	dma_addr_t paddr;
···
 	if (!bus_format)
 		bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 
-	mxsfb_crtc_mode_set_nofb(mxsfb, bus_format);
+	mxsfb_crtc_mode_set_nofb(mxsfb, bridge_state, bus_format);
 
 	/* Write cur_buf as well to avoid an initial corrupt frame */
 	paddr = drm_fb_cma_get_gem_addr(new_pstate->fb, new_pstate, 0);