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4948738e29
On TGP, the RTC (always running) was reduced from 3MHz to 32KHz. As a result of this change, when HPD active going low pulse or HPD IRQ is presented and the refclk (19.2MHz) is not toggling already toggling, there is a 60 to 90us synchronization delay which effectively reduces the duration of the IRQ pulse to less than the programmed 500us filter value and the hot plug interrupt is NOT registered. Solution was to Reduce SHPD_FILTER to 250us for ADL and above. This solution was derived when the below patch was floated. [1]https://patchwork.freedesktop.org/patch/532187 and after some internal discussion Ville's suggestion made sense. Bspec: 68970 Cc: Uma Shankar <uma.shankar@intel.com> Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Suggested-by: Ville Syrjala <ville.syrjala@linux.intel.com> Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com> Reviewed-by: Uma Shankar <uma.shankar@intel.com> Signed-off-by: Uma Shankar <uma.shankar@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230720104624.3063544-1-suraj.kandpal@intel.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.