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[2a01:cb00:8bd:2700:95bc:7625:808e:ade0]) by smtp.gmail.com with ESMTPSA id r7sm19031803wre.25.2021.03.08.04.05.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Mar 2021 04:05:58 -0800 (PST) From: Adrien Grassein To: Subject: [PATCH v7 0/2] Add support of Lontium lt8912 MIPI to HDMI bridge Date: Mon, 8 Mar 2021 13:05:53 +0100 Message-Id: <20210308120555.252524-1-adrien.grassein@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, jernej.skrabec@siol.net, narmstrong@baylibre.com, airlied@linux.ie, dri-devel@lists.freedesktop.org, jonas@kwiboo.se, linux-kernel@vger.kernel.org, robert.foss@linaro.org, a.hajda@samsung.com, robh+dt@kernel.org, Laurent.pinchart@ideasonboard.com, Adrien Grassein Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi, this patch set adds the support of the Lontium lt8912 MIPI to HDMI bridge in the kernel. It's only support the video part, not the audio part yet since I don't have the datasheet of this component. I get the current i2c configuration from Digi and Boundary drivers. Developed using the DB_DSIHD board from BoundaryDevices. Update in v2 - Use standard data-lanes instead of a custom prop; - Use hdmi-connector node. Update in v3 - Fix indentation; - Implement missing bridge functions; - Add some comments. Update in v4 - Fix bridge ops; - Fix i2c error detection. Update in v5 - Fix lt8912 name (lt8912b instead of lt8912); - Implement HPD via a workaround. In fact I don't have the datasheet of this component yet so I can't say if the configuration of the registers is correct or if I have an HW issue on my board. So, I choose to implement a fake version of HPD using a workqueue and polling the status regularly. Update in v6 - Fix a warning found by "kernel test robot" Update in v7 - Fix HPD logic (via an HW emulation); - HPD from chip is still not working. Thanks, Adrien Grassein (2): dt-bindings: display: bridge: Add documentation for LT8912B drm/bridge: Introduce LT8912B DSI to HDMI bridge .../display/bridge/lontium,lt8912b.yaml | 102 +++ MAINTAINERS | 6 + drivers/gpu/drm/bridge/Kconfig | 14 + drivers/gpu/drm/bridge/Makefile | 1 + drivers/gpu/drm/bridge/lontium-lt8912b.c | 836 ++++++++++++++++++ 5 files changed, 959 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml create mode 100644 drivers/gpu/drm/bridge/lontium-lt8912b.c