drm/i915/vblank: add and use intel_de_read64_2x32() to read vblank counter

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Add intel_de_read64_2x32() wrapper for the uncore version of the same,
and use it to read the high and low frame registers. Avoid duplicating
code for existing helpers.

The slight functional difference is checking that the entire high
register remains the same across two reads, instead of just the part
we're interested in. This should be of no consequence. (Unless those
bits function as a PRNG.)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/33853549adff82045b95af527e14cfdff5712470.1673873708.git.jani.nikula@intel.com

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This commit is contained in:

Jani Nikula 2023-01-16 14:56:16 +02:00

parent 75018f47ac

commit 1af13bc6d0

2 changed files with 13 additions and 19 deletions

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7

drivers/gpu/drm/i915/display/intel_de.h

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25

drivers/gpu/drm/i915/display/intel_vblank.c

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