cable_is_40wire
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## Name

cable_is_40wire — 40/80/SATA decider

## Synopsis

`int cable_is_40wire (` | struct ata_port * ap`)`;

## Arguments

`ap`

  port to consider

## Description

This function encapsulates the policy for speed management in one place. At the moment we don't cache the result but there is a good case for setting ap->cbl to the result when we are called with unknown cables (and figuring out if it impacts hotplug at all).

Return 1 if the cable appears to be 40 wire.

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