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Convert MSE (mean-square error) values to SNR and split it SQI (Signal Quality Indicator) ranges. The used ranges are taken from "OPEN ALLIANCE - Advanced diagnostic features for 100BASE-T1 automotive Ethernet PHYs" specification. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Link: https://lore.kernel.org/r/20220620115601.2035452-1-o.rempel@pengutronix.de Signed-off-by: Jakub Kicinski <kuba@kernel.org>