linux-kernel - [PATCH net-next 1/3] net: ipa: have ipa_endpoint_init

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Date:   Mon,  4 May 2020 18:37:11 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net
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 1/3] net: ipa: have ipa_endpoint_init_ctrl() return previous state

Change ipa_endpoint_init_ctrl() so it returns the previous state
(whether suspend or delay mode was enabled) rather than indicating
whether the request caused a change in state.  This makes it easier
to understand what's happening where called.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_endpoint.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 6de03be28784..ad72adff653e 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -284,11 +284,12 @@ static struct gsi_trans *ipa_endpoint_trans_alloc(struct ipa_endpoint *endpoint,
 /* suspend_delay represents suspend for RX, delay for TX endpoints.
  * Note that suspend is not supported starting with IPA v4.0.
  */
-static int
+static bool
 ipa_endpoint_init_ctrl(struct ipa_endpoint *endpoint, bool suspend_delay)
 {
 	u32 offset = IPA_REG_ENDP_INIT_CTRL_N_OFFSET(endpoint->endpoint_id);
 	struct ipa *ipa = endpoint->ipa;
+	bool state;
 	u32 mask;
 	u32 val;
 
@@ -296,13 +297,14 @@ ipa_endpoint_init_ctrl(struct ipa_endpoint *endpoint, bool suspend_delay)
 	mask = endpoint->toward_ipa ? ENDP_DELAY_FMASK : ENDP_SUSPEND_FMASK;
 
 	val = ioread32(ipa->reg_virt + offset);
-	if (suspend_delay == !!(val & mask))
-		return -EALREADY;	/* Already set to desired state */
+	/* Don't bother if it's already in the requested state */
+	state = !!(val & mask);
+	if (suspend_delay != state) {
+		val ^= mask;
+		iowrite32(val, ipa->reg_virt + offset);
+	}
 
-	val ^= mask;
-	iowrite32(val, ipa->reg_virt + offset);
-
-	return 0;
+	return state;
 }
 
 /* Enable or disable delay or suspend mode on all modem endpoints */
@@ -1164,8 +1166,7 @@ static int ipa_endpoint_reset_rx_aggr(struct ipa_endpoint *endpoint)
 
 	/* Make sure the channel isn't suspended */
 	if (endpoint->ipa->version == IPA_VERSION_3_5_1)
-		if (!ipa_endpoint_init_ctrl(endpoint, false))
-			endpoint_suspended = true;
+		endpoint_suspended = ipa_endpoint_init_ctrl(endpoint, false);
 
 	/* Start channel and do a 1 byte read */
 	ret = gsi_channel_start(gsi, endpoint->channel_id);
@@ -1318,21 +1319,20 @@ static void ipa_endpoint_program(struct ipa_endpoint *endpoint)
 	if (endpoint->toward_ipa) {
 		bool delay_mode = endpoint->data->tx.delay;
 
-		ret = ipa_endpoint_init_ctrl(endpoint, delay_mode);
 		/* Endpoint is expected to not be in delay mode */
-		if (!ret != delay_mode) {
+		if (ipa_endpoint_init_ctrl(endpoint, delay_mode))
 			dev_warn(dev,
 				"TX endpoint %u was %sin delay mode\n",
 				endpoint->endpoint_id,
 				delay_mode ? "already " : "");
-		}
 		ipa_endpoint_init_hdr_ext(endpoint);
 		ipa_endpoint_init_aggr(endpoint);
 		ipa_endpoint_init_deaggr(endpoint);
 		ipa_endpoint_init_seq(endpoint);
 	} else {
+		/* Endpoint is expected to not be suspended */
 		if (endpoint->ipa->version == IPA_VERSION_3_5_1) {
-			if (!ipa_endpoint_init_ctrl(endpoint, false))
+			if (ipa_endpoint_init_ctrl(endpoint, false))
 				dev_warn(dev,
 					"RX endpoint %u was suspended\n",
 					endpoint->endpoint_id);
@@ -1471,7 +1471,7 @@ void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint)
 	/* 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)
-		WARN_ON(ipa_endpoint_init_ctrl(endpoint, false));
+		WARN_ON(!ipa_endpoint_init_ctrl(endpoint, false));
 
 	ret = gsi_channel_resume(gsi, endpoint->channel_id, start_channel);
 	if (ret)
-- 
2.20.1