[PATCH v2] drm: mxsfb: Obtain bus flags from bridge state

[Lucas Stach]

Am Sonntag, dem 17.04.2022 um 04:10 +0200 schrieb Marek Vasut:
> 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 at ew.tq-group.com>
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Alexander Stein <alexander.stein at ew.tq-group.com>
> Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> Cc: Lucas Stach <l.stach at pengutronix.de>
> Cc: Peng Fan <peng.fan at nxp.com>
> Cc: Robby Cai <robby.cai at nxp.com>
> Cc: Sam Ravnborg <sam at ravnborg.org>
> Cc: Stefan Agner <stefan at agner.ch>

Reviewed-by: Lucas Stach <l.stach at pengutronix.de>

> ---
> V2: Add AB from Alexander
> ---
>  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 b7c70d269d2cb..cd2a59e110c3a 100644
> --- 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);