linux-kernel - [PATCH 0/2] drm/komeda: Enable dual-link support

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Date:   Tue, 18 Jun 2019 08:10:33 +0000
From:   "james qian wang (Arm Technology China)" <james.qian.wang@....com>
To:     Liviu Dudau <Liviu.Dudau@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        Brian Starkey <Brian.Starkey@....com>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        "sean@...rly.run" <sean@...rly.run>
CC:     "Jonathan Chai (Arm Technology China)" <Jonathan.Chai@....com>,
        "Julien Yin (Arm Technology China)" <Julien.Yin@....com>,
        "thomas Sun (Arm Technology China)" <thomas.Sun@....com>,
        "Lowry Li (Arm Technology China)" <Lowry.Li@....com>,
        Ayan Halder <Ayan.Halder@....com>,
        "Tiannan Zhu (Arm Technology China)" <Tiannan.Zhu@....com>,
        "Yiqi Kang (Arm Technology China)" <Yiqi.Kang@....com>,
        nd <nd@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Ben Davis <Ben.Davis@....com>,
        "Oscar Zhang (Arm Technology China)" <Oscar.Zhang@....com>,
        "Channing Chen (Arm Technology China)" <Channing.Chen@....com>,
        "james qian wang (Arm Technology China)" <james.qian.wang@....com>
Subject: [PATCH 0/2] drm/komeda: Enable dual-link support

Komeda HW can support dual-link which splits display frame to two halves
(left/link0, right/link1) and output them by two output links.
Due to the halved pixel rate of each link, the pxlclk of dual-link can be
reduced two times compare with single-link.

For enabling dual-link:
- The DT need to configure two output-links for the pipeline node.
- Komeda enable dual-link when both link0 and link1 have been connected.

Example of how the pipeline node will look like for dual-link setup

pipe0: pipeline@0 {
	clocks = <&fpgaosc2>;
	clock-names = "pxclk";
	reg = <0>;

	#address-cells = <1>;
	#size-cells = <0>;

	port@0 {
		reg = <0>;

		#address-cells = <1>;
		#size-cells = <0>;
		dp0_pipe0_link0: endpoint@0 {
			reg = <0>;
			remote-endpoint = <&dlink_connector_in0>;

		};
		dp0_pipe0_link1: endpoint@1 {
			reg = <1>;
			remote-endpoint = <&dlink_connector_in1>;
		};
	};
};

James Qian Wang (Arm Technology China) (2):
  drm/komeda: Use drm_display_mode "crtc_" prefixed hardware timings
  drm/komeda: Enable dual-link support

 .../arm/display/komeda/d71/d71_component.c    | 42 +++++----
 .../gpu/drm/arm/display/komeda/komeda_crtc.c  | 89 +++++++++++++------
 .../gpu/drm/arm/display/komeda/komeda_dev.c   |  5 +-
 .../gpu/drm/arm/display/komeda/komeda_drv.c   |  8 +-
 .../gpu/drm/arm/display/komeda/komeda_kms.h   |  4 +-
 .../drm/arm/display/komeda/komeda_pipeline.c  | 19 +++-
 .../drm/arm/display/komeda/komeda_pipeline.h  |  6 +-
 .../display/komeda/komeda_pipeline_state.c    |  2 +-
 8 files changed, 118 insertions(+), 57 deletions(-)

--
2.17.1