drm/radeon/kms: take the pm mutex when using hw i2c
we need a constant sclk for i2c prescale. Also, get the current sclk when calculating prescale rather than using the default sclk. Signed-off-by: Alex Deucher <alexdeucher@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
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