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In contrast to all of the DSI panel drivers in drivers/gpu/drm/panel which attach to the DSI host via mipi_dsi_attach() at probe time, the ADV7533 bridge device does not. Instead it defers this to the point that the upstream device connects to its bridge via drm_bridge_attach(). The generic Synopsys MIPI DSI host driver does not register it's own drm_bridge until the MIPI DSI has attached. But it does not call drm_bridge_attach() on the downstream device until the upstream device has attached. This leads to a chicken and the egg failure and the DRM pipeline does not complete. Since all other mipi_dsi_device drivers call mipi_dsi_attach() in probe(), make the adv7533 mipi_dsi_device do the same. This ensures that the Synopsys MIPI DSI host registers it's bridge such that it is available for the upstream device to connect to. Signed-off-by: Matt Redfearn <matt.redfearn@thinci.com> Signed-off-by: Andrzej Hajda <a.hajda@samsung.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190627151740.2277-1-matt.redfearn@thinci.com |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.