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This fixes a problem found on the MacBookPro 2017 Retina panel. The panel reports 10 bpc color depth in its EDID, and the firmware chooses link settings at boot which support enough bandwidth for 10 bpc (324000 kbit/sec = multiplier 0xc), but the DP_MAX_LINK_RATE dpcd register only reports 2.7 Gbps (multiplier value 0xa) as possible, in direct contradiction of what the firmware successfully set up. This restricts the panel to 8 bpc, not providing the full color depth of the panel. This patch adds a quirk specific to the MBP 2017 15" Retina panel to add the additiional 324000 kbps link rate during edp setup. Link to previous discussion of a different attempted fix with Ville and Jani: https://patchwork.kernel.org/patch/11325935/ v2: Follow Jani's proposal of defining quirk_rates[] instead of just appending 324000. This for better clarity. v3: Rebased onto current drm-tip, as of 16-March-2020. Adapt to new edid_quirks parameter of drm_dp_has_quirk(). Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com> Tested-by: Mario Kleiner <mario.kleiner.de@gmail.com> Cc: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200316042340.4783-1-mario.kleiner.de@gmail.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
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Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
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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
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