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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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