net: ipa: use tag process on modem crash (2c4bb809) · Commits · 戴 / test

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>

drivers/net/ipa/ipa_cmd.c

+3 −11

Original line number	Diff line number	Diff line
		@@ -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_ip_packet_init_add(trans, endpoint->endpoint_id);

		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 */

Admin message