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The DP spec says:
"When the combination of the requested pre-emphasis level and
voltage swing exceeds the capability of a DPTX, the DPTX shall
set the pre-emphasis level according to the request and use the
highest voltage swing it can output with the given pre-emphasis level."
and
"When a DPTX reads a request beyond the limits of this Standard,
the DPTX shall set the pre-emphasis level according to the request
and set the highest voltage swing level it can output with the
given pre-emphasis level. If a DPTX is requested for 9.5dB of
pre-emphasis level (may be supported for a DPTX) and cannot support
that level, it shall set the pre-emphasis level to the next
highest level, 6dB."
Ie. we should first validate the pre-emphasis, and then select
the appropriate vswing for it.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200512174145.3186-6-ville.syrjala@linux.intel.com
Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
f6adb5f061