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High refresh rate panels which may have small line times and vblank sizes, Check if vblank size is sufficient for enabled scaler users. --v2: - Use hweight* family of functions for counting bits. [Jani] - Update precision handling for hscale and vscale. [Ankit] - Consider chroma downscaling factor during latency calculation. [Ankit] - Replace function name from scaler_prefill_time to scaler_prefill_latency. --v3: - hscale_k and vscale_k values are already left shifted by 16, after multiplying by 1000, those need to be right shifted to 16. [Ankit] - Replace YCBCR444 to YCBCR420. [Ankit] - Divide by 1000 * 1000 in end to get correct precision. [Ankit] - Initialise latency to 0 to avoid any garbage. --v4: - Elaborate commit message and add Bspec number. [Ankit] - Improvise latency calculation. [Ankit] - Use ceiling value for down scaling factor when less than 1 as per bspec. [Ankit] - Correct linetime calculation. [Ankit] - Consider cdclk prefill adjustment while prefill computation.[Ankit] --v5: - Add Bspec link in commit message trailer. [Ankit] - Correct hscale, vscale data type. - Use intel_crtc_compute_min_cdclk. [Ankit] --v6: - Update FIXME comment. - Use cdclk_state->logical.cdclk instead of intel_crtc_compute_min_cdclk. [Ankit] --v7: - Handle error return from cdclk_prefill_adjustment. [Ankit] - Avoid incorrect round off for linetime. [Ankit] - Correct precision. [Ankit] --v8: - Remove redundancy calculation added from previous patch. [Ankit] Bspec: 70151 Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@intel.com> Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20250120172209.188488-7-mitulkumar.ajitkumar.golani@intel.com
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.