bge(4) sends BGE_FW_CMD_DRV_ALIVE command to firmware every 2
seconds. BGE_FW_CMD_DRV_ALIVE command requires 4 bytes data. This
data contains timeout value in seconds until the next
BGE_FW_CMD_DRV_ALIVE command.
Broadcom recommends driver set the value 3 times longer than the
interval that it sends BGE_FW_CMD_DRV_ALIVE. Currently bge(4) uses
3 seconds so probably we have to increase it in future and use
different ALIVE command(e.g. BGE_FW_CMD_DRV_ALIVE3).
No functional changes.
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