linux-kernel - Re: [PATCH v2 7/7] drm/mediatek: mtk

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Date:   Thu, 16 Apr 2020 20:36:15 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     linux-kernel@...r.kernel.org,
        Collabora Kernel ML <kernel@...labora.com>,
        matthias.bgg@...il.com, drinkcat@...omium.org, hsinyi@...omium.org,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 7/7] drm/mediatek: mtk_dsi: Create connector for
 bridges

Hi Enric,

On Thu, Apr 16, 2020 at 08:35:26PM +0300, Laurent Pinchart wrote:
> On Thu, Apr 16, 2020 at 05:57:19PM +0200, Enric Balletbo i Serra wrote:
> > Use the drm_bridge_connector helper to create a connector for pipelines
> > that use drm_bridge. This allows splitting connector operations across
> > multiple bridges when necessary, instead of having the last bridge in
> > the chain creating the connector and handling all connector operations
> > internally.
> 
> That's the right direction, but this should be done in the mtk display
> controller driver core, not in here. I'm OK with the code being here as
> an interim measure if needed to move forward, but that should then be
> temporary only.

I forgot to mention that the drm_encoder should also move out of the
bridge driver to the display controller driver.

> > Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> > ---
> > 
> > Changes in v2: None
> > 
> >  drivers/gpu/drm/mediatek/mtk_dsi.c | 14 +++++++++++++-
> >  1 file changed, 13 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > index 44718fa3d1ca..2f8876c32864 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > @@ -17,6 +17,7 @@
> >  
> >  #include <drm/drm_atomic_helper.h>
> >  #include <drm/drm_bridge.h>
> > +#include <drm/drm_bridge_connector.h>
> >  #include <drm/drm_mipi_dsi.h>
> >  #include <drm/drm_of.h>
> >  #include <drm/drm_panel.h>
> > @@ -184,6 +185,7 @@ struct mtk_dsi {
> >  	struct drm_bridge bridge;
> >  	struct drm_bridge *panel_bridge;
> >  	struct drm_bridge *next_bridge;
> > +	struct drm_connector *connector;
> >  	struct phy *phy;
> >  
> >  	void __iomem *regs;
> > @@ -983,10 +985,19 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
> >  	 */
> >  	dsi->encoder.possible_crtcs = 1;
> >  
> > -	ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
> > +	ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL,
> > +				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> >  	if (ret)
> >  		goto err_cleanup_encoder;
> >  
> > +	dsi->connector = drm_bridge_connector_init(drm, &dsi->encoder);
> > +	if (IS_ERR(dsi->connector)) {
> > +		DRM_ERROR("Unable to create bridge connector\n");
> > +		ret = PTR_ERR(dsi->connector);
> > +		goto err_cleanup_encoder;
> > +	}
> > +	drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
> > +
> >  	return 0;
> >  
> >  err_cleanup_encoder:
> > @@ -1144,6 +1155,7 @@ static int mtk_dsi_probe(struct platform_device *pdev)
> >  
> >  	dsi->bridge.funcs = &mtk_dsi_bridge_funcs;
> >  	dsi->bridge.of_node = dev->of_node;
> > +	dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
> 
> I think this line belongs to the patch that adds drm_bridge support to
> this driver.
> 
> >  
> >  	drm_bridge_add(&dsi->bridge);
> >  

-- 
Regards,

Laurent Pinchart