drm/i915/cdclk: Document CDCLK update methods

Add a bit of documentation to briefly explain the methods
by which we can change the CDCLK frequency.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240207013334.29606-5-ville.syrjala@linux.intel.com
Reviewed-by: Gustavo Sousa <gustavo.sousa@intel.com>
This commit is contained in:
Ville Syrjälä 2024-02-07 03:33:34 +02:00
commit 79e2ea2eaa