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 <alexander.stein@ew.tq-group.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexander Stein <alexander.stein@ew.tq-group.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Robby Cai <robby.cai@nxp.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Stefan Agner <stefan@agner.ch>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220417021011.337066-1-marex@denx.de

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
index b7c70d2..cd2a59e 100644 (file)
--- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
@@ -275,6 +275,7 @@ 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;
@@ -284,6 +285,8 @@ 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,
@@ -345,7 +348,7 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
        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;
@@ -381,7 +384,7 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
        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);