Imre Deak 8d677285a3 drm/i915/dp: Handle Synaptics DSC throughput link-bpp quirk
Handle the DSC pixel throughput quirk, limiting the compressed link-bpp
value for Synaptics Panamera branch devices, working around a
blank/unstable output issue observed on docking stations containing
these branch devices, when using a mode with a high pixel clock and a
high compressed link-bpp value.

For now use the same mode clock limit for RGB/YUV444 and YUV422/420
output modes. This may result in limiting the link-bpp value for a
YUV422/420 output mode already at a lower than required mode clock.

v2: Apply the quirk only when DSC is enabled.
v3 (Ville):
- Move adjustment of link-bpp within the already existing is_dsc
  if branch.
- Add TODO comment to move the HW revision check as well to the
  DRM core quirk table.
v4:
- Fix incorrect fxp_q4_from_int(INT_MAX) vs. INT_MAX return value
  from dsc_throughput_quirk_max_bpp_x16().

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reported-by: Vidya Srinivas <vidya.srinivas@intel.com>
Reported-and-tested-by: Swati Sharma <swati2.sharma@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://lore.kernel.org/r/20250930182450.563016-7-imre.deak@intel.com
2025-10-02 18:51:36 +03:00
2025-09-15 17:51:07 +10:00
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2025-09-15 17:51:07 +10:00
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2025-09-14 14:21:14 -07:00
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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 reStructuredText 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.
S
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