[PATCH] drm: mxsfb: Obtain bus flags from bridge state

[Marek Vasut <marex@xxxxxxx>]

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.

Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Cc: Peng Fan <peng.fan@xxxxxxx>
Cc: Robby Cai <robby.cai@xxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Cc: Stefan Agner <stefan@xxxxxxxx>
---
 drivers/gpu/drm/mxsfb/mxsfb_kms.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
index 4baa3db1f3d10..c7f14ef1edc25 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
@@ -298,6 +298,7 @@ static int mxsfb_reset_block(struct mxsfb_drm_private *mxsfb)
 }
 
 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;
@@ -307,6 +308,8 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb,
 
 	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,
@@ -365,7 +368,7 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
 {
 	struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(crtc->dev);
 	struct drm_display_mode *m = &mxsfb->crtc.state->adjusted_mode;
-	struct drm_bridge_state *bridge_state;
+	struct drm_bridge_state *bridge_state = NULL;
 	struct drm_device *drm = mxsfb->drm;
 	u32 bus_format = 0;
 
@@ -399,7 +402,7 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
 
 	pm_runtime_get_sync(drm->dev);
 
-	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 */
 	mxsfb_update_buffer(mxsfb, crtc->primary, true);
-- 
2.35.1