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net: ipa: use tag process on modem crash

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One part of recovering from a modem crash is performing a "tag
sequence" of several IPA immediate commands, to clear the hardware
pipeline.  The sequence ends with a data transfer request on the
command endpoint (which is not otherwise done).  Unfortunately,
attempting to do the data transfer led to a hang, so that request
plus two other commands were commented out.

The previous commit fixes the bug that was causing that hang.  And
with that bug fixed we can properly issue the tag sequence when the
modem crashes, to return the hardware to a known state.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Elder 2020-05-07 14:14:04 -05:00 committed by David S. Miller
parent c781e1d4f3
commit 2c4bb8093c
1 changed files with 3 additions and 11 deletions
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14
drivers/net/ipa/ipa_cmd.c
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@ -628,23 +628,15 @@ static void ipa_cmd_transfer_add(struct gsi_trans *trans, u16 size)
void ipa_cmd_tag_process_add(struct gsi_trans *trans)
{
ipa_cmd_register_write_add(trans, 0, 0, 0, true);
#if 1
/* Reference these functions to avoid a compile error */
(void)ipa_cmd_ip_packet_init_add;
(void)ipa_cmd_ip_tag_status_add;
(void) ipa_cmd_transfer_add;
#else
struct ipa *ipa = container_of(trans->gsi, struct ipa, gsi);
struct gsi_endpoint *endpoint;
struct ipa_endpoint *endpoint;
endpoint = ipa->name_map[IPA_ENDPOINT_AP_LAN_RX];
ipa_cmd_register_write_add(trans, 0, 0, 0, true);
ipa_cmd_ip_packet_init_add(trans, endpoint->endpoint_id);
ipa_cmd_ip_tag_status_add(trans, 0xcba987654321);
ipa_cmd_transfer_add(trans, 4);
#endif
}
/* Returns the number of commands required for the tag process */