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[WHY] i2c_read is called to differentiate passive DP->HDMI and DP->DVI-D dongles The call is expected to fail in DVI-D case but pass in HDMI case Some HDMI dongles have a chance to fail as well, causing misdetection as DVI-D [HOW] Retry i2c_read to ensure failed result is valid Signed-off-by: Michael Strauss <michael.strauss@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Leo Li <sunpeng.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>