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From 7fc6b55fbd279e287a350b85f45885d51c4de5c4 Mon Sep 17 00:00:00 2001
From: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Date: Wed, 25 Mar 2020 15:07:48 +0300
Subject: [PATCH] i2c: busses i2c-rcar: block pm_runtime
This allows blocking of i2c clock runtime control by existing dts
pataremeter multi-master.
This speeds up i2c transaction during stress use case.
Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
---
drivers/i2c/busses/i2c-rcar.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index ddd3b39..4a3ea72 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -786,7 +786,8 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
if (priv->suspended)
return -EBUSY;
- pm_runtime_get_sync(dev);
+ if (!(priv->flags & ID_P_PM_BLOCKED))
+ pm_runtime_get_sync(dev);
/* Check bus state before init otherwise bus busy info will be lost */
ret = rcar_i2c_bus_barrier(priv);
@@ -826,7 +827,8 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
ret = num - priv->msgs_left; /* The number of transfer */
}
out:
- pm_runtime_put(dev);
+ if (!(priv->flags & ID_P_PM_BLOCKED))
+ pm_runtime_put(dev);
if (ret < 0 && ret != -ENXIO)
dev_err(dev, "error %d : %x\n", ret, priv->flags);
@@ -845,7 +847,8 @@ static int rcar_reg_slave(struct i2c_client *slave)
return -EAFNOSUPPORT;
/* Keep device active for slave address detection logic */
- pm_runtime_get_sync(rcar_i2c_priv_to_dev(priv));
+ if (!(priv->flags & ID_P_PM_BLOCKED))
+ pm_runtime_get_sync(rcar_i2c_priv_to_dev(priv));
priv->slave = slave;
rcar_i2c_write(priv, ICSAR, slave->addr);
@@ -867,7 +870,8 @@ static int rcar_unreg_slave(struct i2c_client *slave)
priv->slave = NULL;
- pm_runtime_put(rcar_i2c_priv_to_dev(priv));
+ if (!(priv->flags & ID_P_PM_BLOCKED))
+ pm_runtime_put(rcar_i2c_priv_to_dev(priv));
return 0;
}
@@ -1026,6 +1030,8 @@ static int rcar_i2c_suspend(struct device *dev)
struct platform_device *pdev = to_platform_device(dev);
struct rcar_i2c_priv *priv = platform_get_drvdata(pdev);
+ if (priv->flags & ID_P_PM_BLOCKED)
+ pm_runtime_put(dev);
priv->suspended = 1;
return 0;
@@ -1045,7 +1051,8 @@ static int rcar_i2c_resume(struct device *dev)
dev_err(dev, "Could not calculate clock\n");
rcar_i2c_init(priv);
- pm_runtime_put(dev);
+ if (!(priv->flags & ID_P_PM_BLOCKED))
+ pm_runtime_put(dev);
priv->suspended = 0;
--
2.7.4
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