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.
Marek Vasut
authored
The datasheet for this bridge is not available, the PLL behavior has been inferred from [1] and [2] and by analyzing the DPI pixel clock with scope. After further testing with other displays and different DSI data lane count, it turns out the P-factor is not 1/2^N divider, but rather only 1/N divider. It also turns out the input into the PLL seem to be ByteClock instead of DSI HS clock. Rework the P-factor calculation such that the PLL calculation code handles P-factor from 1..32 with P-factors above 16 must be even. In case P-factor is even, enable built-in 1:2 divider and program P-factor/2 to PLL_REF_DIV, otherwise configure only the P-factor into PLL_REF_DIV register. Switch the PLL factor calculation from kHz to Hz to maintain precision. [1] https://github.com/rockchip-linux/kernel/blob/develop-4.19/drivers/gpu/drm/bridge/icn6211.c [2] https://github.com/tdjastrzebski/ICN6211-Configurator Fixes: f30cf0ec ("drm: bridge: icn6211: Add generic DSI-to-DPI PLL configuration") Signed-off-by:Marek Vasut <marex@denx.de> Cc: Jagan Teki <jagan@amarulasolutions.com> Cc: Maxime Ripard <maxime@cerno.tech> Cc: Robert Foss <robert.foss@linaro.org> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Thomas Zimmermann <tzimmermann@suse.de> To: dri-devel@lists.freedesktop.org Acked-by:
Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20220402004118.897014-1-marex@denx.de
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