scsi: hisi_sas: support the property of signal attenuation for v2 hw

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The register SAS_PHY_CTRL is configured according to signal quality.  The
signal quality is calculated by signal attenuation of hardware physical
link. It may be different for different PCB layout.

So, in order to give better support to new board, this patch add support to
reading the devicetree property, "hisilicon,signal-attenuation".  Of course,
we still keep an default value in driver to adapt old board.

Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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Xiaofei Tan 2018-03-07 20:25:06 +08:00 • committed by Martin K. Petersen

parent 4c40db995e

commit 67c2bf2331

1 changed files with 38 additions and 1 deletions

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drivers/scsi/hisi_sas/hisi_sas_v2_hw.c

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