Merge branch 'i2c/for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c updates from Wolfram Sang:

 - the I2C core gained helpers to assist drivers in handling their
   suspended state, and drivers were converted to use it

 - two new fault-injectors for stress-testing

 - bigger refactoring and feature improvements for the ocores,
   sh_mobile, and tegra drivers

 - platform_data removal for the at24 EEPROM driver

 - ... and various improvements and bugfixes all over the subsystem

* 'i2c/for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (69 commits)
  i2c: Allow recovery of the initial IRQ by an I2C client device.
  i2c: ocores: turn incomplete kdoc into a comment
  i2c: designware: Do not allow i2c_dw_xfer() calls while suspended
  i2c: tegra: Only display error messages if DMA setup fails
  i2c: gpio: fault-injector: add 'inject_panic' injector
  i2c: gpio: fault-injector: add 'lose_arbitration' injector
  i2c: tegra: remove multi-master support
  i2c: tegra: remove master fifo support on tegra186
  i2c: tegra: change phrasing, "fallbacking" to "falling back"
  i2c: expand minor range when registering chrdev region
  i2c: aspeed: Add multi-master use case support
  i2c: core-smbus: don't trace smbus_reply data on errors
  i2c: ocores: Add support for bus clock via platform data
  i2c: ocores: Add support for IO mapper registers.
  i2c: ocores: checkpatch fixes
  i2c: ocores: add SPDX tag
  i2c: ocores: add polling interface
  i2c: ocores: do not handle IRQ if IF is not set
  i2c: ocores: stop transfer on timeout
  i2c: tegra: add i2c interface timing support
  ...

1 files changed, 35 insertions, 14 deletions

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 254e6219e538..dd52a068b140 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -2,8 +2,8 @@
 /*
  * Driver for the Renesas R-Car I2C unit
  *
- * Copyright (C) 2014-15 Wolfram Sang <wsa@sang-engineering.com>
- * Copyright (C) 2011-2015 Renesas Electronics Corporation
+ * Copyright (C) 2014-19 Wolfram Sang <wsa@sang-engineering.com>
+ * Copyright (C) 2011-2019 Renesas Electronics Corporation
  *
  * Copyright (C) 2012-14 Renesas Solutions Corp.
  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
@@ -39,8 +39,8 @@
 #define ICSAR	0x1C	/* slave address */
 #define ICMAR	0x20	/* master address */
 #define ICRXTX	0x24	/* data port */
-#define ICDMAER	0x3c	/* DMA enable */
-#define ICFBSCR	0x38	/* first bit setup cycle */
+#define ICFBSCR	0x38	/* first bit setup cycle (Gen3) */
+#define ICDMAER	0x3c	/* DMA enable (Gen3) */
 
 /* ICSCR */
 #define SDBS	(1 << 3)	/* slave data buffer select */
@@ -83,7 +83,6 @@
 #define TMDMAE	(1 << 0)	/* DMA Master Transmitted Enable */
 
 /* ICFBSCR */
-#define TCYC06	0x04		/*  6*Tcyc delay 1st bit between SDA and SCL */
 #define TCYC17	0x0f		/* 17*Tcyc delay 1st bit between SDA and SCL */
 
 
@@ -212,6 +211,10 @@ static void rcar_i2c_init(struct rcar_i2c_priv *priv)
 	rcar_i2c_write(priv, ICMSR, 0);
 	/* start clock */
 	rcar_i2c_write(priv, ICCCR, priv->icccr);
+
+	if (priv->devtype == I2C_RCAR_GEN3)
+		rcar_i2c_write(priv, ICFBSCR, TCYC17);
+
 }
 
 static int rcar_i2c_bus_barrier(struct rcar_i2c_priv *priv)
@@ -355,9 +358,6 @@ static void rcar_i2c_next_msg(struct rcar_i2c_priv *priv)
 	rcar_i2c_prepare_msg(priv);
 }
 
-/*
- *		interrupt functions
- */
 static void rcar_i2c_dma_unmap(struct rcar_i2c_priv *priv)
 {
 	struct dma_chan *chan = priv->dma_direction == DMA_FROM_DEVICE
@@ -366,9 +366,6 @@ static void rcar_i2c_dma_unmap(struct rcar_i2c_priv *priv)
 	/* Disable DMA Master Received/Transmitted */
 	rcar_i2c_write(priv, ICDMAER, 0);
 
-	/* Reset default delay */
-	rcar_i2c_write(priv, ICFBSCR, TCYC06);
-
 	dma_unmap_single(chan->device->dev, sg_dma_address(&priv->sg),
 			 sg_dma_len(&priv->sg), priv->dma_direction);
 
@@ -464,9 +461,6 @@ static void rcar_i2c_dma(struct rcar_i2c_priv *priv)
 		return;
 	}
 
-	/* Set delay for DMA operations */
-	rcar_i2c_write(priv, ICFBSCR, TCYC17);
-
 	/* Enable DMA Master Received/Transmitted */
 	if (read)
 		rcar_i2c_write(priv, ICDMAER, RMDMAE);
@@ -1017,10 +1011,37 @@ static int rcar_i2c_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int rcar_i2c_suspend(struct device *dev)
+{
+	struct rcar_i2c_priv *priv = dev_get_drvdata(dev);
+
+	i2c_mark_adapter_suspended(&priv->adap);
+	return 0;
+}
+
+static int rcar_i2c_resume(struct device *dev)
+{
+	struct rcar_i2c_priv *priv = dev_get_drvdata(dev);
+
+	i2c_mark_adapter_resumed(&priv->adap);
+	return 0;
+}
+
+static const struct dev_pm_ops rcar_i2c_pm_ops = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(rcar_i2c_suspend, rcar_i2c_resume)
+};
+
+#define DEV_PM_OPS (&rcar_i2c_pm_ops)
+#else
+#define DEV_PM_OPS NULL
+#endif /* CONFIG_PM_SLEEP */
+
 static struct platform_driver rcar_i2c_driver = {
 	.driver	= {
 		.name	= "i2c-rcar",
 		.of_match_table = rcar_i2c_dt_ids,
+		.pm	= DEV_PM_OPS,
 	},
 	.probe		= rcar_i2c_probe,
 	.remove		= rcar_i2c_remove,