drm/vkms/crc: Implement verify_crc_source callback
This patch implements "verify_crc_source" callback function for Virtual KMS drm driver. Changes Since V1: - update values_cnt in verify_crc_source Changes Since V2: - don't return early from set_crc_source to keep behavior same (Haneen) Cc: Haneen Mohammed <hamohammed.sa@gmail.com> Signed-off-by: NMahesh Kumar <mahesh1.kumar@intel.com> Reviewed-by: NHaneen Mohammed <hamohammed.sa@gmail.com> Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180821083858.26275-2-mahesh1.kumar@intel.com
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