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  1. 29 Jan, 2019 11 commits
  3. 23 Jan, 2019 26 commits
  5. 12 Jan, 2019 3 commits
    • Evan Green's avatar
      scsi: ufs: Remove select of phy-qcom-ufs from ufs-qcom · 326a859b
      Evan Green authored 
      CONFIG_SCSI_UFS_QCOM selects CONFIG_PHY_QCOM_UFS, assuming that this was
the only possible PHY driver Qualcomm's UFS controller would use. But in
SDM845, the UFS driver is bundled into phy-qcom-qmp, and phy-qcom-ufs is
unused.

Remove the select, since for SDM845 it adds useless drivers to the build.
Signed-off-by: default avatarEvan Green <evgreen@chromium.org>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      326a859b
    • Otto Sabart's avatar
      scsi: doc: remove reference to tmscsim.txt file · afd05580
      Otto Sabart authored 
      The tmscsim.txt doc file was removed in c121107d.

Fixes: c121107d ("scsi: documentation: Obsolete documentation references")
Signed-off-by: default avatarOtto Sabart <ottosabart@seberm.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      afd05580
    • John Garry's avatar
      scsi: libsas: Support SATA PHY connection rate unmatch fixing during discovery · cec9771d
      John Garry authored 
         +----------+             +----------+
   |          |             |          |
   |          |--- 3.0 G ---|          |--- 6.0 G --- SAS  disk
   |          |             |          |
   |          |--- 3.0 G ---|          |--- 6.0 G --- SAS  disk
   |initiator |             |          |
   | device   |--- 3.0 G ---| Expander |--- 6.0 G --- SAS  disk
   |          |             |          |
   |          |--- 3.0 G ---|          |--- 6.0 G --- SATA disk  -->failed to connect
   |          |             |          |
   |          |             |          |--- 6.0 G --- SATA disk  -->failed to connect
   |          |             |          |
   +----------+             +----------+

According to Serial Attached SCSI - 1.1 (SAS-1.1):
If an expander PHY attached to a SATA PHY is using a physical link rate
greater than the maximum connection rate supported by the pathway from an
STP initiator port, a management application client should use the SMP PHY
CONTROL function (see 10.4.3.10) to set the PROGRAMMED MAXIMUM PHYSICAL
LINK RATE field of the expander PHY to the maximum connection rate
supported by the pathway from that STP initiator port.

Currently libsas does not support checking if this condition occurs, nor
rectifying when it does.

Such a condition is not at all common, however it has been seen on some
pre-silicon environments where the initiator PHY only supports a 1.5 Gbit
maximum linkrate, mated with 12G expander PHYs and 3/6G SATA phy.

This patch adds support for checking and rectifying this condition during
initial device discovery only.

We do support checking min pathway connection rate during revalidation phase,
when new devices can be detected in the topology. However we do not
support in the case of the the user reprogramming PHY linkrates, such that
min pathway condition is not met/maintained.

A note on root port PHY rates:
The libsas root port PHY rates calculation is broken. Libsas sets the
rates (min, max, and current linkrate) of a root port to the same linkrate
of the first PHY member of that same port. In doing so, it assumes that
all other PHYs which subsequently join the port to have the same
negotiated linkrate, when they could actually be different.

In practice this doesn't happen, as initiator and expander PHYs are
normally initialised with consistent min/max linkrates.

This has not caused an issue so far, so leave alone for now.
Tested-by: default avatarJian Luo <luojian5@huawei.com>
Signed-off-by: default avatarJohn Garry <john.garry@huawei.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      cec9771d
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