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Date:   Tue,  3 Aug 2021 09:00:58 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     bjorn.andersson@...aro.org, evgreen@...omium.org,
        cpratapa@...eaurora.org, subashab@...eaurora.org, elder@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 1/6] net: ipa: use gsi->version for channel suspend/resume

The GSI layer has the IPA version now, so there's no need for
version-specific flags to be passed from IPA.  One instance of
this is in gsi_channel_suspend() and gsi_channel_resume(), which
indicate whether or not the endpoint suspend is implemented by
GSI stopping the channel.  We can make that determination based
on gsi->version, eliminating the need for a Boolean flag in those
functions.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/gsi.c          | 14 ++++++++------
 drivers/net/ipa/gsi.h          | 19 +++++++++++++++++--
 drivers/net/ipa/ipa_endpoint.c | 14 ++------------
 3 files changed, 27 insertions(+), 20 deletions(-)

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 3de67ba066a68..e143deddb7c09 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -1026,13 +1026,14 @@ void gsi_channel_reset(struct gsi *gsi, u32 channel_id, bool doorbell)
 	mutex_unlock(&gsi->mutex);
 }
 
-/* Stop a STARTED channel for suspend (using stop if requested) */
-int gsi_channel_suspend(struct gsi *gsi, u32 channel_id, bool stop)
+/* Stop a started channel for suspend */
+int gsi_channel_suspend(struct gsi *gsi, u32 channel_id)
 {
 	struct gsi_channel *channel = &gsi->channel[channel_id];
 	int ret;
 
-	ret = __gsi_channel_stop(channel, stop);
+	/* Prior to IPA v4.0 suspend/resume is not implemented by GSI */
+	ret = __gsi_channel_stop(channel, gsi->version >= IPA_VERSION_4_0);
 	if (ret)
 		return ret;
 
@@ -1042,12 +1043,13 @@ int gsi_channel_suspend(struct gsi *gsi, u32 channel_id, bool stop)
 	return 0;
 }
 
-/* Resume a suspended channel (starting will be requested if STOPPED) */
-int gsi_channel_resume(struct gsi *gsi, u32 channel_id, bool start)
+/* Resume a suspended channel (starting if stopped) */
+int gsi_channel_resume(struct gsi *gsi, u32 channel_id)
 {
 	struct gsi_channel *channel = &gsi->channel[channel_id];
 
-	return __gsi_channel_start(channel, start);
+	/* Prior to IPA v4.0 suspend/resume is not implemented by GSI */
+	return __gsi_channel_start(channel, gsi->version >= IPA_VERSION_4_0);
 }
 
 /**
diff --git a/drivers/net/ipa/gsi.h b/drivers/net/ipa/gsi.h
index 81cd7b07f6e14..97163b58b4ebc 100644
--- a/drivers/net/ipa/gsi.h
+++ b/drivers/net/ipa/gsi.h
@@ -232,8 +232,23 @@ int gsi_channel_stop(struct gsi *gsi, u32 channel_id);
  */
 void gsi_channel_reset(struct gsi *gsi, u32 channel_id, bool doorbell);
 
-int gsi_channel_suspend(struct gsi *gsi, u32 channel_id, bool stop);
-int gsi_channel_resume(struct gsi *gsi, u32 channel_id, bool start);
+/**
+ * gsi_channel_suspend() - Suspend a GSI channel
+ * @gsi:	GSI pointer
+ * @channel_id:	Channel to suspend
+ *
+ * For IPA v4.0+, suspend is implemented by stopping the channel.
+ */
+int gsi_channel_suspend(struct gsi *gsi, u32 channel_id);
+
+/**
+ * gsi_channel_resume() - Resume a suspended GSI channel
+ * @gsi:	GSI pointer
+ * @channel_id:	Channel to resume
+ *
+ * For IPA v4.0+, the stopped channel is started again.
+ */
+int gsi_channel_resume(struct gsi *gsi, u32 channel_id);
 
 /**
  * gsi_init() - Initialize the GSI subsystem
diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 8070d1a1d5dfd..08ee37ae28813 100644
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -1587,7 +1587,6 @@ void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint)
 {
 	struct device *dev = &endpoint->ipa->pdev->dev;
 	struct gsi *gsi = &endpoint->ipa->gsi;
-	bool stop_channel;
 	int ret;
 
 	if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
@@ -1598,11 +1597,7 @@ void ipa_endpoint_suspend_one(struct ipa_endpoint *endpoint)
 		(void)ipa_endpoint_program_suspend(endpoint, true);
 	}
 
-	/* Starting with IPA v4.0, endpoints are suspended by stopping the
-	 * underlying GSI channel rather than using endpoint suspend mode.
-	 */
-	stop_channel = endpoint->ipa->version >= IPA_VERSION_4_0;
-	ret = gsi_channel_suspend(gsi, endpoint->channel_id, stop_channel);
+	ret = gsi_channel_suspend(gsi, endpoint->channel_id);
 	if (ret)
 		dev_err(dev, "error %d suspending channel %u\n", ret,
 			endpoint->channel_id);
@@ -1612,7 +1607,6 @@ void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint)
 {
 	struct device *dev = &endpoint->ipa->pdev->dev;
 	struct gsi *gsi = &endpoint->ipa->gsi;
-	bool start_channel;
 	int ret;
 
 	if (!(endpoint->ipa->enabled & BIT(endpoint->endpoint_id)))
@@ -1621,11 +1615,7 @@ void ipa_endpoint_resume_one(struct ipa_endpoint *endpoint)
 	if (!endpoint->toward_ipa)
 		(void)ipa_endpoint_program_suspend(endpoint, false);
 
-	/* Starting with IPA v4.0, the underlying GSI channel must be
-	 * restarted for resume.
-	 */
-	start_channel = endpoint->ipa->version >= IPA_VERSION_4_0;
-	ret = gsi_channel_resume(gsi, endpoint->channel_id, start_channel);
+	ret = gsi_channel_resume(gsi, endpoint->channel_id);
 	if (ret)
 		dev_err(dev, "error %d resuming channel %u\n", ret,
 			endpoint->channel_id);
-- 
2.27.0

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