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| author |  Alex Elder <elder@linaro.org>
| 2021-11-24 13:44:15 -0600 |
|---|---|---|
| committer |  Jakub Kicinski <kuba@kernel.org>
| 2021-11-25 20:03:20 -0800 |
| commit | 4c9d631adbc277b33704a971cde6dd8ce44fbb8f (patch) | |
| tree | 14c6ca62b0a80db6f5be734314a553c62b3e450f /drivers/net/ipa/gsi_reg.h | |
| parent | Merge branch 'mctp-serial-minor-fixes' (diff) | |
| download | linux-4c9d631adbc277b33704a971cde6dd8ce44fbb8f.tar.gz linux-4c9d631adbc277b33704a971cde6dd8ce44fbb8f.tar.bz2 linux-4c9d631adbc277b33704a971cde6dd8ce44fbb8f.zip | |
net: ipa: introduce channel flow control
One quirk for certain versions of IPA is that endpoint DELAY mode
does not work properly. IPA DELAY mode prevents any packets from
being delivered to the IPA core for processing on a TX endpoint.
The AP uses DELAY mode when the modem crashes, to prevent modem TX
endpoints from generating traffic during crash recovery. Without
this, there is a chance the hardware will stall during recovery from
a modem crash.
To achieve a similar effect, a GSI FLOW_CONTROLLED channel state
was created. A STARTED TX channel can be placed in FLOW_CONTROLLED
state, which prevents the transfer of any more packets. A channel
in FLOW_CONTROLLED state can be either returned to STARTED state, or
can be transitioned to STOPPED state.
Because this operates on GSI channels, two generic commands were
added to allow the AP to control this state for modem channels
(similar to the ALLOCATE and HALT channel commands).
Previously the code assumed this quirk only applied to IPA v4.2.
In fact, channel flow control (rather than endpoint DELAY mode)
should be used for all versions *starting* with IPA v4.2.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/ipa/gsi_reg.h')
| -rw-r--r-- | drivers/net/ipa/gsi_reg.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/ipa/gsi_reg.h b/drivers/net/ipa/gsi_reg.h index bf9593d9eaea..4ab23998b348 100644 --- a/drivers/net/ipa/gsi_reg.h +++ b/drivers/net/ipa/gsi_reg.h @@ -318,6 +318,8 @@ enum gsi_evt_cmd_opcode { enum gsi_generic_cmd_opcode { GSI_GENERIC_HALT_CHANNEL = 0x1, GSI_GENERIC_ALLOCATE_CHANNEL = 0x2, + GSI_GENERIC_ENABLE_FLOW_CONTROL = 0x3, /* IPA v4.2+ */ + GSI_GENERIC_DISABLE_FLOW_CONTROL = 0x4, /* IPA v4.2+ */ }; /* The next register is present for IPA v3.5.1 and above */ |