linux-kernel - Re: [PATCH] drm/mediatek: Only try to attach bridge if there is one

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Date:   Mon, 3 Dec 2018 11:27:00 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Nicolas Boichat <drinkcat@...omium.org>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/mediatek: Only try to attach bridge if there is one

Hi, Nicolas:

On Mon, 2018-11-26 at 13:30 +0800, CK Hu wrote:
> Hi, Nicolas:
> 
> On Mon, 2018-11-26 at 12:07 +0800, Nicolas Boichat wrote:
> > Even if dsi->bridge is NULL, we still try to call drm_bridge_attach,
> > and print out an error message, before creating the connector.
> > 
> > When no bridge is provided, let's skip these 2 steps and directly
> > create the connector.
> 

Applied to mediatek-drm-fixes-4.20 [1], thanks.

[1]
https://github.com/ckhu-mediatek/linux.git-tags/commits/mediatek-drm-fixes-4.20

Regards,
CK

> Reviewed-by: CK Hu <ck.hu@...iatek.com>
> 
> > 
> > Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_dsi.c | 11 +++++++----
> >  1 file changed, 7 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > index 66df1b17795921..27b507eb4a997d 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> > @@ -818,10 +818,13 @@ static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi)
> >  	dsi->encoder.possible_crtcs = 1;
> >  
> >  	/* If there's a bridge, attach to it and let it create the connector */
> > -	ret = drm_bridge_attach(&dsi->encoder, dsi->bridge, NULL);
> > -	if (ret) {
> > -		DRM_ERROR("Failed to attach bridge to drm\n");
> > -
> > +	if (dsi->bridge) {
> > +		ret = drm_bridge_attach(&dsi->encoder, dsi->bridge, NULL);
> > +		if (ret) {
> > +			DRM_ERROR("Failed to attach bridge to drm\n");
> > +			goto err_encoder_cleanup;
> > +		}
> > +	} else {
> >  		/* Otherwise create our own connector and attach to a panel */
> >  		ret = mtk_dsi_create_connector(drm, dsi);
> >  		if (ret)
>