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Add a macro to check for the max_downspread capability in drm_dp_helper. Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com> Reviewed-by: Stephen Boyd <swboyd@chromium.org> changes in v4: - Return 1 for DPCD version >= v1.1 (Stephen Boyd) Link: https://lore.kernel.org/r/1635839325-401-4-git-send-email-quic_sbillaka@quicinc.com Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Signed-off-by: Rob Clark <robdclark@chromium.org>