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Message-Id: <20180525143618.820-8-srinivas.kandagatla@linaro.org>
Date: Fri, 25 May 2018 15:36:17 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH v3 7/8] slimbus: messaging: add slim_prepare_txn() helper function
This patch adds slim_prepare_txn() to allow controllers to prepare
controller specific transaction. If not each controllers will duplicate
the same code from core.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
drivers/slimbus/messaging.c | 84 ++++++++++++++++++++++++++++++---------------
drivers/slimbus/slimbus.h | 2 ++
2 files changed, 58 insertions(+), 28 deletions(-)
diff --git a/drivers/slimbus/messaging.c b/drivers/slimbus/messaging.c
index e3605ed1c459..cfffa1dece61 100644
--- a/drivers/slimbus/messaging.c
+++ b/drivers/slimbus/messaging.c
@@ -55,6 +55,46 @@ void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 len)
}
EXPORT_SYMBOL_GPL(slim_msg_response);
+/**
+ * slim_prepare_txn() - Prepare a transaction
+ *
+ * @ctrl: Controller handle
+ * @txn: transaction to be prepared
+ * @done: completion for transaction if msg does not have completion
+ * @need_tid: flag to indicate if tid is required for this txn
+ * note, user defined commands would need tid.
+ *
+ * Called by controller to prepare a transaction
+ *
+ * Return: zero on success and error code on failures.
+ */
+int slim_prepare_txn(struct slim_controller *ctrl, struct slim_msg_txn *txn,
+ struct completion *done, bool need_tid)
+{
+ unsigned long flags;
+ int ret = 0;
+
+ txn->need_tid = need_tid;
+ if (!need_tid)
+ return 0;
+
+ spin_lock_irqsave(&ctrl->txn_lock, flags);
+ ret = idr_alloc(&ctrl->tid_idr, txn, 0, SLIM_MAX_TIDS, GFP_ATOMIC);
+ if (ret < 0)
+ goto err;
+
+ txn->tid = ret;
+ if (!txn->msg->comp)
+ txn->comp = done;
+ else
+ txn->comp = txn->msg->comp;
+
+err:
+ spin_unlock_irqrestore(&ctrl->txn_lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(slim_prepare_txn);
+
/**
* slim_do_transfer() - Process a SLIMbus-messaging transaction
*
@@ -70,10 +110,9 @@ EXPORT_SYMBOL_GPL(slim_msg_response);
*/
int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn)
{
- DECLARE_COMPLETION_ONSTACK(done);
- bool need_tid = false, clk_pause_msg = false;
+ bool clk_pause_msg = false;
unsigned long flags;
- int ret, tid, timeout;
+ int ret, timeout;
/*
* do not vote for runtime-PM if the transactions are part of clock
@@ -94,28 +133,8 @@ int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn)
}
}
- need_tid = slim_tid_txn(txn->mt, txn->mc);
-
- if (need_tid) {
- spin_lock_irqsave(&ctrl->txn_lock, flags);
- tid = idr_alloc(&ctrl->tid_idr, txn, 0,
- SLIM_MAX_TIDS, GFP_ATOMIC);
- txn->tid = tid;
-
- if (!txn->msg->comp)
- txn->comp = &done;
- else
- txn->comp = txn->comp;
-
- spin_unlock_irqrestore(&ctrl->txn_lock, flags);
-
- if (tid < 0)
- return tid;
- }
-
ret = ctrl->xfer_msg(ctrl, txn);
-
- if (ret && need_tid && !txn->msg->comp) {
+ if (!ret && txn->need_tid && !txn->msg->comp) {
unsigned long ms = txn->rl + HZ;
timeout = wait_for_completion_timeout(txn->comp,
@@ -123,7 +142,7 @@ int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn)
if (!timeout) {
ret = -ETIMEDOUT;
spin_lock_irqsave(&ctrl->txn_lock, flags);
- idr_remove(&ctrl->tid_idr, tid);
+ idr_remove(&ctrl->tid_idr, txn->tid);
spin_unlock_irqrestore(&ctrl->txn_lock, flags);
}
}
@@ -133,13 +152,14 @@ int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn)
txn->mt, txn->mc, txn->la, ret);
slim_xfer_err:
- if (!clk_pause_msg && (!need_tid || ret == -ETIMEDOUT)) {
+ if (!clk_pause_msg && (!txn->need_tid || ret == -ETIMEDOUT)) {
/*
* remove runtime-pm vote if this was TX only, or
* if there was error during this transaction
*/
pm_runtime_mark_last_busy(ctrl->dev);
pm_runtime_put_autosuspend(ctrl->dev);
+
}
return ret;
}
@@ -205,6 +225,8 @@ int slim_xfer_msg(struct slim_device *sbdev, struct slim_val_inf *msg,
DEFINE_SLIM_LDEST_TXN(txn_stack, mc, 6, sbdev->laddr, msg);
struct slim_msg_txn *txn = &txn_stack;
struct slim_controller *ctrl = sbdev->ctrl;
+ DECLARE_COMPLETION_ONSTACK(done);
+ bool need_tid = false;
int ret;
u16 sl;
@@ -232,10 +254,16 @@ int slim_xfer_msg(struct slim_device *sbdev, struct slim_val_inf *msg,
break;
}
- if (slim_tid_txn(txn->mt, txn->mc))
+ if (slim_tid_txn(txn->mt, txn->mc)) {
txn->rl++;
+ need_tid = true;
+ }
- return slim_do_transfer(ctrl, txn);
+ ret = slim_prepare_txn(ctrl, txn, &done, need_tid);
+ if (!ret)
+ return slim_do_transfer(ctrl, txn);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(slim_xfer_msg);
diff --git a/drivers/slimbus/slimbus.h b/drivers/slimbus/slimbus.h
index 3ec5a85fba8e..8266e53535cb 100644
--- a/drivers/slimbus/slimbus.h
+++ b/drivers/slimbus/slimbus.h
@@ -242,6 +242,8 @@ int slim_unregister_controller(struct slim_controller *ctrl);
void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 l);
int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn);
int slim_ctrl_clk_pause(struct slim_controller *ctrl, bool wakeup, u8 restart);
+int slim_prepare_txn(struct slim_controller *ctrl, struct slim_msg_txn *txn,
+ struct completion *done, bool need_tid);
static inline bool slim_tid_txn(u8 mt, u8 mc)
{
--
2.16.2
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