linux-kernel - Re: [PATCH] drm/arm: hdlcd: Set the CRTC's port before binding the encoder.

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Message-ID: <20170628090507.blk73i3osfgq43jx@phenom.ffwll.local>
Date:   Wed, 28 Jun 2017 11:05:07 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Liviu Dudau <Liviu.Dudau@....com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/arm: hdlcd: Set the CRTC's port before binding the
 encoder.

On Tue, Jun 06, 2017 at 04:16:05PM +0100, Liviu Dudau wrote:
> The component-based encoder(s) used by HDLCD expect the CRTC port
> to be set before binding in order to find the right endpoint.
> Without this patch, the TDA19988 encoder driver prints a warning
> "Falling back to first CRTC".
> 
> Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
> ---
>  drivers/gpu/drm/arm/hdlcd_drv.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/arm/hdlcd_drv.c b/drivers/gpu/drm/arm/hdlcd_drv.c
> index 345c8357b273..d3da87fbd85a 100644
> --- a/drivers/gpu/drm/arm/hdlcd_drv.c
> +++ b/drivers/gpu/drm/arm/hdlcd_drv.c
> @@ -297,6 +297,9 @@ static int hdlcd_drm_bind(struct device *dev)
>  	if (ret)
>  		goto err_free;
>  
> +	/* Set the CRTC's port so that the encoder component can find it */
> +	hdlcd->crtc.port = of_graph_get_port_by_id(dev->of_node, 0);
> +
>  	ret = component_bind_all(dev, drm);
>  	if (ret) {
>  		DRM_ERROR("Failed to bind all components\n");
> @@ -340,11 +343,14 @@ static int hdlcd_drm_bind(struct device *dev)
>  	}
>  err_fbdev:
>  	drm_kms_helper_poll_fini(drm);
> +	drm_vblank_cleanup(drm);

You're resurrecting dead code here. I'll do a fixup patch so I can finally
unload my drm_vblank_cleanup.
-Daniel

>  err_vblank:
>  	pm_runtime_disable(drm->dev);
>  err_pm_active:
>  	component_unbind_all(dev, drm);
>  err_unload:
> +	of_node_put(hdlcd->crtc.port);
> +	hdlcd->crtc.port = NULL;
>  	drm_irq_uninstall(drm);
>  	of_reserved_mem_device_release(drm->dev);
>  err_free:
> @@ -367,6 +373,9 @@ static void hdlcd_drm_unbind(struct device *dev)
>  	}
>  	drm_kms_helper_poll_fini(drm);
>  	component_unbind_all(dev, drm);
> +	of_node_put(hdlcd->crtc.port);
> +	hdlcd->crtc.port = NULL;
> +	drm_vblank_cleanup(drm);
>  	pm_runtime_get_sync(drm->dev);
>  	drm_irq_uninstall(drm);
>  	pm_runtime_put_sync(drm->dev);
> -- 
> 2.13.0
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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