Date:   Thu, 10 Aug 2017 14:05:19 -0400
From:   Sean Paul <seanpaul@...omium.org>
To:     Sandy Huang <sandy.huang@...k-chips.com>
Cc:     Sean Paul <seanpaul@...omium.org>,
        Sandy Huang <hjc@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Mark Yao <mark.yao@...k-chips.com>
Subject: Re: [PATCH 3/3] drm/rockchip: Add support for Rockchip Soc LVDS

On Thu, Aug 10, 2017 at 05:35:52PM +0800, Sandy Huang wrote:
> Hi Sean Paul,
>     Thanks for your review.
> 
> 在 2017/8/10 3:58, Sean Paul 写道:
> > On Wed, Aug 09, 2017 at 06:00:59PM +0800, Sandy Huang wrote:
> > > This adds support for Rockchip soc lvds found on rk3288
> > > Based on the patches from Mark yao and Heiko Stuebner
> > > 
> > > Signed-off-by: Sandy Huang <hjc@...k-chips.com>
> > > Signed-off-by: Mark yao <mark.yao@...k-chips.com>
> > > Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> > > ---
> > >   drivers/gpu/drm/rockchip/Kconfig         |   9 +
> > >   drivers/gpu/drm/rockchip/Makefile        |   1 +
> > >   drivers/gpu/drm/rockchip/rockchip_lvds.c | 734 +++++++++++++++++++++++++++++++
> > >   drivers/gpu/drm/rockchip/rockchip_lvds.h | 112 +++++
> > >   4 files changed, 856 insertions(+)
> > >   create mode 100644 drivers/gpu/drm/rockchip/rockchip_lvds.c
> > >   create mode 100644 drivers/gpu/drm/rockchip/rockchip_lvds.h
> > > 

<snip />

> > > diff --git a/drivers/gpu/drm/rockchip/rockchip_lvds.c b/drivers/gpu/drm/rockchip/rockchip_lvds.c
> > > new file mode 100644
> > > index 0000000..a4ad3f0
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/rockchip/rockchip_lvds.c

<snip />

> > > +	lvds->drm_dev = drm_dev;
> > > +	port = of_graph_get_port_by_id(dev->of_node, 1);
> > > +	if (!port) {
> > > +		dev_err(dev, "can't found port point, please init lvds panel port!\n");
> > > +		return -EINVAL;
> > > +	}
> > > +
> > > +	for_each_child_of_node(port, endpoint) {
> > > +		remote = of_graph_get_remote_port_parent(endpoint);
> > > +		if (!remote) {
> > > +			dev_err(dev, "can't found panel node, please init!\n");
> > > +			ret = -EINVAL;
> > > +			goto err_put_port;
> > > +		}
> > > +		if (!of_device_is_available(remote)) {
> > > +			of_node_put(remote);
> > > +			remote = NULL;
> > > +			continue;
> > > +		}
> > > +		break;
> > > +	}
> > > +	if (!remote) {
> > > +		dev_err(dev, "can't found remote node, please init!\n");
> > > +		ret = -EINVAL;
> > > +		goto err_put_port;
> > > +	}
> > > +
> > > +	lvds->panel = of_drm_find_panel(remote);
> > > +	if (!lvds->panel)
> > > +		lvds->bridge = of_drm_find_bridge(remote);
> > 
> > drm_of_find_panel_or_bridge()
> > 
> 
> because the lvds ports maybe connect to lvds-panel or connect to
> rk1000(which is convert RGB to CVBS output), so i have to get the remote
> port parent and check the status, and final get the active remote point.
> 



> lvds_panel: lvds-panel {
> 	status = "disabled";
> 	ports {
> 		panel_in_lvds: endpoint {
> 			remote-endpoint = <&lvds_out_panel>;
> 		};
> 	};
> };
> 
> rk1000: rk1000@...f000000 {
> 	status = "okay";
> 	ports {
> 		rk1000_in_lvds: endpoint {
> 			remote-endpoint = <&lvds_out_panel>;
> 		};
> 	};
> };
> 
> &lvds {
> 	status = "okay";
> 	ports {
> 		lvds_out: port@1 {
> 			reg = <1>;
> 			lvds_out_panel: endpoint@0 {
> 				reg = <0>;
> 				remote-endpoint = <&panel_in_lvds>;
> 			};
> 			lvds_out_rk1000: endpoint@1 {
> 				reg = <1>;
> 				remote-endpoint = <&rk1000_in_lvds>;
> 			};
> 		};
> 
> 	};
> };

Hi Sandy,
Forgive me, this is probably a stupid question. I don't see how this usecase is
unique from the other users of drm_of_find_panel_or_bridge. Couldn't you change
your devicetree bindings to conform to something drm_of_find_panel_or_bridge()
can work with?

Thank you,

Sean

<snip />

> > > -- 
> > > 2.7.4
> > > 
> > > 
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel@...ts.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> > 
> 
> -- 
> Best Regard
> 
> 黄家钗
> Sandy Huang
> 福州瑞芯微电子股份有限公司-图形与显示系统部门
> Fuzhou Rockchip Electronics Co.Ltd - Graphics & Display Dept.
> Addr: 福州市鼓楼区铜盘路软件大道89号福州软件园A区21号楼(350003)
>          No. 21 Building, A District, No.89,software Boulevard
> Fuzhou,Fujian,PRC
> Tel：+86 0591-87884919  8690
> E-mail：hjc@...k-chips.com
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS

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