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

Pull i2c fixes from Wolfram Sang:
 "This is a bit larger than usual at rc4 time. The reason is due to
  Lee's work of fixing newly reported build warnings.

  The rest is fixes as usual"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (22 commits)
  MAINTAINERS: adjust to removing i2c designware platform data
  i2c: s3c2410: fix possible NULL pointer deref on read message after write
  i2c: mediatek: Disable i2c start_en and clear intr_stat brfore reset
  i2c: i801: Don't generate an interrupt on bus reset
  i2c: mpc: implement erratum A-004447 workaround
  powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P1010 i2c controllers
  powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P2041 i2c controllers
  dt-bindings: i2c: mpc: Add fsl,i2c-erratum-a004447 flag
  i2c: busses: i2c-stm32f4: Remove incorrectly placed ' ' from function name
  i2c: busses: i2c-st: Fix copy/paste function misnaming issues
  i2c: busses: i2c-pnx: Provide descriptions for 'alg_data' data structure
  i2c: busses: i2c-ocores: Place the expected function names into the documentation headers
  i2c: busses: i2c-eg20t: Fix 'bad line' issue and provide description for 'msgs' param
  i2c: busses: i2c-designware-master: Fix misnaming of 'i2c_dw_init_master()'
  i2c: busses: i2c-cadence: Fix incorrectly documented 'enum cdns_i2c_slave_mode'
  i2c: busses: i2c-ali1563: File headers are not good candidates for kernel-doc
  i2c: muxes: i2c-arb-gpio-challenge: Demote non-conformant kernel-doc headers
  i2c: busses: i2c-nomadik: Fix formatting issue pertaining to 'timeout'
  i2c: sh_mobile: Use new clock calculation formulas for RZ/G2E
  i2c: I2C_HISI should depend on ACPI
  ...

Documentation/devicetree/bindings/i2c/i2c-mpc.yaml

@@ -46,6 +46,13 @@ properties:
     description: |
       I2C bus timeout in microseconds
 
+  fsl,i2c-erratum-a004447:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description: |
+      Indicates the presence of QorIQ erratum A-004447, which
+      says that the standard i2c recovery scheme mechanism does
+      not work and an alternate implementation is needed.
+
 required:
   - compatible
   - reg

MAINTAINERS

@@ -17678,7 +17678,6 @@ R:	Mika Westerberg <mika.westerberg@linux.intel.com>
 L:	linux-i2c@vger.kernel.org
 S:	Maintained
 F:	drivers/i2c/busses/i2c-designware-*
-F:	include/linux/platform_data/i2c-designware.h
 
 SYNOPSYS DESIGNWARE MMC/SD/SDIO DRIVER
 M:	Jaehoon Chung <jh80.chung@samsung.com>

arch/powerpc/boot/dts/fsl/p1010si-post.dtsi

@@ -122,7 +122,15 @@ memory-controller@2000 {
 	};
 
 /include/ "pq3-i2c-0.dtsi"
+	i2c@3000 {
+		fsl,i2c-erratum-a004447;
+	};
+
 /include/ "pq3-i2c-1.dtsi"
+	i2c@3100 {
+		fsl,i2c-erratum-a004447;
+	};
+
 /include/ "pq3-duart-0.dtsi"
 /include/ "pq3-espi-0.dtsi"
 	spi0: spi@7000 {

arch/powerpc/boot/dts/fsl/p2041si-post.dtsi

@@ -371,7 +371,23 @@ sdhc@114000 {
 	};
 
 /include/ "qoriq-i2c-0.dtsi"
+	i2c@118000 {
+		fsl,i2c-erratum-a004447;
+	};
+
+	i2c@118100 {
+		fsl,i2c-erratum-a004447;
+	};
+
 /include/ "qoriq-i2c-1.dtsi"
+	i2c@119000 {
+		fsl,i2c-erratum-a004447;
+	};
+
+	i2c@119100 {
+		fsl,i2c-erratum-a004447;
+	};
+
 /include/ "qoriq-duart-0.dtsi"
 /include/ "qoriq-duart-1.dtsi"
 /include/ "qoriq-gpio-0.dtsi"

drivers/i2c/busses/Kconfig

@@ -647,7 +647,7 @@ config I2C_HIGHLANDER
 
 config I2C_HISI
 	tristate "HiSilicon I2C controller"
-	depends on ARM64 || COMPILE_TEST
+	depends on (ARM64 && ACPI) || COMPILE_TEST
 	help
 	  Say Y here if you want to have Hisilicon I2C controller support
 	  available on the Kunpeng Server.

drivers/i2c/busses/i2c-ali1563.c

 // SPDX-License-Identifier: GPL-2.0-only
-/**
+/*
  *	i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge
  *
  *	Copyright (C) 2004 Patrick Mochel

drivers/i2c/busses/i2c-cadence.c

@@ -144,7 +144,7 @@ enum cdns_i2c_mode {
 };
 
 /**
- * enum cdns_i2c_slave_mode - Slave state when I2C is operating in slave mode
+ * enum cdns_i2c_slave_state - Slave state when I2C is operating in slave mode
  *
  * @CDNS_I2C_SLAVE_STATE_IDLE: I2C slave idle
  * @CDNS_I2C_SLAVE_STATE_SEND: I2C slave sending data to master

drivers/i2c/busses/i2c-designware-master.c

@@ -165,7 +165,7 @@ static int i2c_dw_set_timings_master(struct dw_i2c_dev *dev)
 }
 
 /**
- * i2c_dw_init() - Initialize the designware I2C master hardware
+ * i2c_dw_init_master() - Initialize the designware I2C master hardware
  * @dev: device private data
  *
  * This functions configures and enables the I2C master.

drivers/i2c/busses/i2c-eg20t.c

@@ -148,7 +148,7 @@ struct i2c_algo_pch_data {
 
 /**
  * struct adapter_info - This structure holds the adapter information for the
-			 PCH i2c controller
+ *			 PCH i2c controller
  * @pch_data:		stores a list of i2c_algo_pch_data
  * @pch_i2c_suspended:	specifies whether the system is suspended or not
  *			perhaps with more lines and words.
@@ -358,6 +358,7 @@ static void pch_i2c_repstart(struct i2c_algo_pch_data *adap)
 /**
  * pch_i2c_writebytes() - write data to I2C bus in normal mode
  * @i2c_adap:	Pointer to the struct i2c_adapter.
+ * @msgs:	Pointer to the i2c message structure.
  * @last:	specifies whether last message or not.
  *		In the case of compound mode it will be 1 for last message,
  *		otherwise 0.

drivers/i2c/busses/i2c-i801.c

@@ -395,11 +395,9 @@ static int i801_check_post(struct i801_priv *priv, int status)
 		dev_err(&priv->pci_dev->dev, "Transaction timeout\n");
 		/* try to stop the current command */
 		dev_dbg(&priv->pci_dev->dev, "Terminating the current operation\n");
-		outb_p(inb_p(SMBHSTCNT(priv)) | SMBHSTCNT_KILL,
-		       SMBHSTCNT(priv));
+		outb_p(SMBHSTCNT_KILL, SMBHSTCNT(priv));
 		usleep_range(1000, 2000);
-		outb_p(inb_p(SMBHSTCNT(priv)) & (~SMBHSTCNT_KILL),
-		       SMBHSTCNT(priv));
+		outb_p(0, SMBHSTCNT(priv));
 
 		/* Check if it worked */
 		status = inb_p(SMBHSTSTS(priv));

drivers/i2c/busses/i2c-icy.c

@@ -123,7 +123,6 @@ static int icy_probe(struct zorro_dev *z,
 {
 	struct icy_i2c *i2c;
 	struct i2c_algo_pcf_data *algo_data;
-	struct fwnode_handle *new_fwnode;
 	struct i2c_board_info ltc2990_info = {
 		.type		= "ltc2990",
 		.swnode		= &icy_ltc2990_node,

drivers/i2c/busses/i2c-mpc.c

@@ -19,6 +19,7 @@
 
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/iopoll.h>
 #include <linux/fsl_devices.h>
 #include <linux/i2c.h>
 #include <linux/interrupt.h>
@@ -45,6 +46,7 @@
 #define CCR_MTX  0x10
 #define CCR_TXAK 0x08
 #define CCR_RSTA 0x04
+#define CCR_RSVD 0x02
 
 #define CSR_MCF  0x80
 #define CSR_MAAS 0x40
@@ -97,7 +99,7 @@ struct mpc_i2c {
 	u32 block;
 	int rc;
 	int expect_rxack;
-
+	bool has_errata_A004447;
 };
 
 struct mpc_i2c_divider {
@@ -136,6 +138,75 @@ static void mpc_i2c_fixup(struct mpc_i2c *i2c)
 	}
 }
 
+static int i2c_mpc_wait_sr(struct mpc_i2c *i2c, int mask)
+{
+	void __iomem *addr = i2c->base + MPC_I2C_SR;
+	u8 val;
+
+	return readb_poll_timeout(addr, val, val & mask, 0, 100);
+}
+
+/*
+ * Workaround for Erratum A004447. From the P2040CE Rev Q
+ *
+ * 1.  Set up the frequency divider and sampling rate.
+ * 2.  I2CCR - a0h
+ * 3.  Poll for I2CSR[MBB] to get set.
+ * 4.  If I2CSR[MAL] is set (an indication that SDA is stuck low), then go to
+ *     step 5. If MAL is not set, then go to step 13.
+ * 5.  I2CCR - 00h
+ * 6.  I2CCR - 22h
+ * 7.  I2CCR - a2h
+ * 8.  Poll for I2CSR[MBB] to get set.
+ * 9.  Issue read to I2CDR.
+ * 10. Poll for I2CSR[MIF] to be set.
+ * 11. I2CCR - 82h
+ * 12. Workaround complete. Skip the next steps.
+ * 13. Issue read to I2CDR.
+ * 14. Poll for I2CSR[MIF] to be set.
+ * 15. I2CCR - 80h
+ */
+static void mpc_i2c_fixup_A004447(struct mpc_i2c *i2c)
+{
+	int ret;
+	u32 val;
+
+	writeccr(i2c, CCR_MEN | CCR_MSTA);
+	ret = i2c_mpc_wait_sr(i2c, CSR_MBB);
+	if (ret) {
+		dev_err(i2c->dev, "timeout waiting for CSR_MBB\n");
+		return;
+	}
+
+	val = readb(i2c->base + MPC_I2C_SR);
+
+	if (val & CSR_MAL) {
+		writeccr(i2c, 0x00);
+		writeccr(i2c, CCR_MSTA | CCR_RSVD);
+		writeccr(i2c, CCR_MEN | CCR_MSTA | CCR_RSVD);
+		ret = i2c_mpc_wait_sr(i2c, CSR_MBB);
+		if (ret) {
+			dev_err(i2c->dev, "timeout waiting for CSR_MBB\n");
+			return;
+		}
+		val = readb(i2c->base + MPC_I2C_DR);
+		ret = i2c_mpc_wait_sr(i2c, CSR_MIF);
+		if (ret) {
+			dev_err(i2c->dev, "timeout waiting for CSR_MIF\n");
+			return;
+		}
+		writeccr(i2c, CCR_MEN | CCR_RSVD);
+	} else {
+		val = readb(i2c->base + MPC_I2C_DR);
+		ret = i2c_mpc_wait_sr(i2c, CSR_MIF);
+		if (ret) {
+			dev_err(i2c->dev, "timeout waiting for CSR_MIF\n");
+			return;
+		}
+		writeccr(i2c, CCR_MEN);
+	}
+}
+
 #if defined(CONFIG_PPC_MPC52xx) || defined(CONFIG_PPC_MPC512x)
 static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
 	{20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
@@ -670,7 +741,10 @@ static int fsl_i2c_bus_recovery(struct i2c_adapter *adap)
 {
 	struct mpc_i2c *i2c = i2c_get_adapdata(adap);
 
-	mpc_i2c_fixup(i2c);
+	if (i2c->has_errata_A004447)
+		mpc_i2c_fixup_A004447(i2c);
+	else
+		mpc_i2c_fixup(i2c);
 
 	return 0;
 }
@@ -767,6 +841,9 @@ static int fsl_i2c_probe(struct platform_device *op)
 	}
 	dev_info(i2c->dev, "timeout %u us\n", mpc_ops.timeout * 1000000 / HZ);
 
+	if (of_property_read_bool(op->dev.of_node, "fsl,i2c-erratum-a004447"))
+		i2c->has_errata_A004447 = true;
+
 	i2c->adap = mpc_ops;
 	scnprintf(i2c->adap.name, sizeof(i2c->adap.name),
 		  "MPC adapter (%s)", of_node_full_name(op->dev.of_node));

drivers/i2c/busses/i2c-mt65xx.c

@@ -479,6 +479,11 @@ static void mtk_i2c_clock_disable(struct mtk_i2c *i2c)
 static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
 {
 	u16 control_reg;
+	u16 intr_stat_reg;
+
+	mtk_i2c_writew(i2c, I2C_CHN_CLR_FLAG, OFFSET_START);
+	intr_stat_reg = mtk_i2c_readw(i2c, OFFSET_INTR_STAT);
+	mtk_i2c_writew(i2c, intr_stat_reg, OFFSET_INTR_STAT);
 
 	if (i2c->dev_comp->apdma_sync) {
 		writel(I2C_DMA_WARM_RST, i2c->pdmabase + OFFSET_RST);

drivers/i2c/busses/i2c-nomadik.c

@@ -159,7 +159,7 @@ struct i2c_nmk_client {
  * @clk_freq: clock frequency for the operation mode
  * @tft: Tx FIFO Threshold in bytes
  * @rft: Rx FIFO Threshold in bytes
- * @timeout Slave response timeout (ms)
+ * @timeout: Slave response timeout (ms)
  * @sm: speed mode
  * @stop: stop condition.
  * @xfer_complete: acknowledge completion for a I2C message.

drivers/i2c/busses/i2c-ocores.c

@@ -250,7 +250,7 @@ static irqreturn_t ocores_isr(int irq, void *dev_id)
 }
 
 /**
- * Process timeout event
+ * ocores_process_timeout() - Process timeout event
  * @i2c: ocores I2C device instance
  */
 static void ocores_process_timeout(struct ocores_i2c *i2c)
@@ -264,7 +264,7 @@ static void ocores_process_timeout(struct ocores_i2c *i2c)
 }
 
 /**
- * Wait until something change in a given register
+ * ocores_wait() - Wait until something change in a given register
  * @i2c: ocores I2C device instance
  * @reg: register to query
  * @mask: bitmask to apply on register value
@@ -296,7 +296,7 @@ static int ocores_wait(struct ocores_i2c *i2c,
 }
 
 /**
- * Wait until is possible to process some data
+ * ocores_poll_wait() - Wait until is possible to process some data
  * @i2c: ocores I2C device instance
  *
  * Used when the device is in polling mode (interrupts disabled).
@@ -334,7 +334,7 @@ static int ocores_poll_wait(struct ocores_i2c *i2c)
 }
 
 /**
- * It handles an IRQ-less transfer
+ * ocores_process_polling() - It handles an IRQ-less transfer
  * @i2c: ocores I2C device instance
  *
  * Even if IRQ are disabled, the I2C OpenCore IP behavior is exactly the same

drivers/i2c/busses/i2c-pnx.c

@@ -138,7 +138,7 @@ static inline void i2c_pnx_arm_timer(struct i2c_pnx_algo_data *alg_data)
 /**
  * i2c_pnx_start - start a device
  * @slave_addr:		slave address
- * @adap:		pointer to adapter structure
+ * @alg_data:		pointer to local driver data structure
  *
  * Generate a START signal in the desired mode.
  */
@@ -194,7 +194,7 @@ static int i2c_pnx_start(unsigned char slave_addr,
 
 /**
  * i2c_pnx_stop - stop a device
- * @adap:		pointer to I2C adapter structure
+ * @alg_data:		pointer to local driver data structure
  *
  * Generate a STOP signal to terminate the master transaction.
  */
@@ -223,7 +223,7 @@ static void i2c_pnx_stop(struct i2c_pnx_algo_data *alg_data)
 
 /**
  * i2c_pnx_master_xmit - transmit data to slave
- * @adap:		pointer to I2C adapter structure
+ * @alg_data:		pointer to local driver data structure
  *
  * Sends one byte of data to the slave
  */
@@ -293,7 +293,7 @@ static int i2c_pnx_master_xmit(struct i2c_pnx_algo_data *alg_data)
 
 /**
  * i2c_pnx_master_rcv - receive data from slave
- * @adap:		pointer to I2C adapter structure
+ * @alg_data:		pointer to local driver data structure
  *
  * Reads one byte data from the slave
  */

drivers/i2c/busses/i2c-qcom-geni.c

@@ -100,7 +100,7 @@ static const struct geni_i2c_err_log gi2c_log[] = {
 	[GP_IRQ0] = {-EIO, "Unknown I2C err GP_IRQ0"},
 	[NACK] = {-ENXIO, "NACK: slv unresponsive, check its power/reset-ln"},
 	[GP_IRQ2] = {-EIO, "Unknown I2C err GP IRQ2"},
-	[BUS_PROTO] = {-EPROTO, "Bus proto err, noisy/unepxected start/stop"},
+	[BUS_PROTO] = {-EPROTO, "Bus proto err, noisy/unexpected start/stop"},
 	[ARB_LOST] = {-EAGAIN, "Bus arbitration lost, clock line undriveable"},
 	[GP_IRQ5] = {-EIO, "Unknown I2C err GP IRQ5"},
 	[GENI_OVERRUN] = {-EIO, "Cmd overrun, check GENI cmd-state machine"},

drivers/i2c/busses/i2c-s3c2410.c

@@ -480,7 +480,10 @@ static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
 					 * forces us to send a new START
 					 * when we change direction
 					 */
+					dev_dbg(i2c->dev,
+						"missing START before write->read\n");
 					s3c24xx_i2c_stop(i2c, -EINVAL);
+					break;
 				}
 
 				goto retry_write;

drivers/i2c/busses/i2c-sh_mobile.c

@@ -807,7 +807,7 @@ static const struct sh_mobile_dt_config r8a7740_dt_config = {
 static const struct of_device_id sh_mobile_i2c_dt_ids[] = {
 	{ .compatible = "renesas,iic-r8a73a4", .data = &fast_clock_dt_config },
 	{ .compatible = "renesas,iic-r8a7740", .data = &r8a7740_dt_config },
-	{ .compatible = "renesas,iic-r8a774c0", .data = &fast_clock_dt_config },
+	{ .compatible = "renesas,iic-r8a774c0", .data = &v2_freq_calc_dt_config },
 	{ .compatible = "renesas,iic-r8a7790", .data = &v2_freq_calc_dt_config },
 	{ .compatible = "renesas,iic-r8a7791", .data = &v2_freq_calc_dt_config },
 	{ .compatible = "renesas,iic-r8a7792", .data = &v2_freq_calc_dt_config },

drivers/i2c/busses/i2c-st.c

@@ -524,7 +524,7 @@ static void st_i2c_handle_write(struct st_i2c_dev *i2c_dev)
 }
 
 /**
- * st_i2c_handle_write() - Handle FIFO enmpty interrupt in case of read
+ * st_i2c_handle_read() - Handle FIFO empty interrupt in case of read
  * @i2c_dev: Controller's private data
  */
 static void st_i2c_handle_read(struct st_i2c_dev *i2c_dev)
@@ -558,7 +558,7 @@ static void st_i2c_handle_read(struct st_i2c_dev *i2c_dev)
 }
 
 /**
- * st_i2c_isr() - Interrupt routine
+ * st_i2c_isr_thread() - Interrupt routine
  * @irq: interrupt number
  * @data: Controller's private data
  */

drivers/i2c/busses/i2c-stm32f4.c

@@ -313,7 +313,7 @@ static int stm32f4_i2c_wait_free_bus(struct stm32f4_i2c_dev *i2c_dev)
 }
 
 /**
- * stm32f4_i2c_write_ byte() - Write a byte in the data register
+ * stm32f4_i2c_write_byte() - Write a byte in the data register
  * @i2c_dev: Controller's private data
  * @byte: Data to write in the register
  */

drivers/i2c/muxes/i2c-arb-gpio-challenge.c

@@ -34,7 +34,7 @@ struct i2c_arbitrator_data {
 };
 
 
-/**
+/*
  * i2c_arbitrator_select - claim the I2C bus
  *
  * Use the GPIO-based signalling protocol; return -EBUSY if we fail.
@@ -77,7 +77,7 @@ static int i2c_arbitrator_select(struct i2c_mux_core *muxc, u32 chan)
 	return -EBUSY;
 }
 
-/**
+/*
  * i2c_arbitrator_deselect - release the I2C bus
  *
  * Release the I2C bus using the GPIO-based signalling protocol.