netdev - [PATCH net-next 3/4] net: ipa: move version test inside ipa_endpoint_program

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Message-Id: <20200702112537.347994-4-elder@linaro.org>
Date:   Thu,  2 Jul 2020 06:25:36 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     evgreen@...omium.org, subashab@...eaurora.org,
        cpratapa@...eaurora.org, bjorn.andersson@...aro.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 3/4] net: ipa: move version test inside ipa_endpoint_program_suspend()

IPA version 4.0+ does not support endpoint suspend.  Put a test at
the top of ipa_endpoint_program_suspend() that returns immediately
if suspend is not supported rather than making that check in the caller.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_endpoint.c | 29 +++++++++++++----------------
 1 file changed, 13 insertions(+), 16 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index d6ef5b8647bf..df4202794e69 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -378,6 +378,9 @@ ipa_endpoint_program_suspend(struct ipa_endpoint *endpoint, bool enable)
 {
 	bool suspended;
 
+	if (endpoint->ipa->version != IPA_VERSION_3_5_1)
+		return enable;	/* For IPA v4.0+, no change made */
+
 	/* assert(!endpoint->toward_ipa); */
 
 	suspended = ipa_endpoint_init_ctrl(endpoint, enable);
@@ -395,26 +398,22 @@ ipa_endpoint_program_suspend(struct ipa_endpoint *endpoint, bool enable)
 /* Enable or disable delay or suspend mode on all modem endpoints */
 void ipa_endpoint_modem_pause_all(struct ipa *ipa, bool enable)
 {
-	bool support_suspend;
 	u32 endpoint_id;
 
 	/* DELAY mode doesn't work correctly on IPA v4.2 */
 	if (ipa->version == IPA_VERSION_4_2)
 		return;
 
-	/* Only IPA v3.5.1 supports SUSPEND mode on RX endpoints */
-	support_suspend = ipa->version == IPA_VERSION_3_5_1;
-
 	for (endpoint_id = 0; endpoint_id < IPA_ENDPOINT_MAX; endpoint_id++) {
 		struct ipa_endpoint *endpoint = &ipa->endpoint[endpoint_id];
 
 		if (endpoint->ee_id != GSI_EE_MODEM)
 			continue;
 
-		/* Set TX delay mode, or for IPA v3.5.1 RX suspend mode */
+		/* Set TX delay mode or RX suspend mode */
 		if (endpoint->toward_ipa)
 			ipa_endpoint_program_delay(endpoint, enable);
-		else if (support_suspend)
+		else
 			(void)ipa_endpoint_program_suspend(endpoint, enable);
 	}
 }
@@ -1248,8 +1247,7 @@ static int ipa_endpoint_reset_rx_aggr(struct ipa_endpoint *endpoint)
 	gsi_channel_reset(gsi, endpoint->channel_id, false);
 
 	/* Make sure the channel isn't suspended */
-	if (endpoint->ipa->version == IPA_VERSION_3_5_1)
-		suspended = ipa_endpoint_program_suspend(endpoint, false);
+	suspended = ipa_endpoint_program_suspend(endpoint, false);
 
 	/* Start channel and do a 1 byte read */
 	ret = gsi_channel_start(gsi, endpoint->channel_id);
@@ -1340,8 +1338,7 @@ static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
 		ipa_endpoint_init_seq(endpoint);
 		ipa_endpoint_init_mode(endpoint);
 	} else {
-		if (endpoint->ipa->version == IPA_VERSION_3_5_1)
-			(void)ipa_endpoint_program_suspend(endpoint, false);
+		(void)ipa_endpoint_program_suspend(endpoint, false);
 		ipa_endpoint_init_hdr_ext(endpoint);
 		ipa_endpoint_init_aggr(endpoint);
 		ipa_endpoint_init_hdr_metadata_mask(endpoint);
@@ -1416,11 +1413,11 @@ void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint)
 	if (!endpoint->toward_ipa)
 		ipa_endpoint_replenish_disable(endpoint);
 
+	if (!endpoint->toward_ipa)
+		(void)ipa_endpoint_program_suspend(endpoint, true);
+
 	/* IPA v3.5.1 doesn't use channel stop for suspend */
 	stop_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
-	if (!endpoint->toward_ipa && !stop_channel)
-		(void)ipa_endpoint_program_suspend(endpoint, true);
-
 	ret = gsi_channel_suspend(gsi, endpoint->channel_id, stop_channel);
 	if (ret)
 		dev_err(dev, "error %d suspending channel %u\n", ret,
@@ -1437,11 +1434,11 @@ void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint)
 	if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
 		return;
 
+	if (!endpoint->toward_ipa)
+		(void)ipa_endpoint_program_suspend(endpoint, false);
+
 	/* IPA v3.5.1 doesn't use channel start for resume */
 	start_channel = endpoint->ipa->version != IPA_VERSION_3_5_1;
-	if (!endpoint->toward_ipa && !start_channel)
-		(void)ipa_endpoint_program_suspend(endpoint, false);
-
 	ret = gsi_channel_resume(gsi, endpoint->channel_id, start_channel);
 	if (ret)
 		dev_err(dev, "error %d resuming channel %u\n", ret,
-- 
2.25.1