Merge tag 'linux-can-next-for-5.10-20200930' of...

Merge tag 'linux-can-next-for-5.10-20200930' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

Marc Kleine-Budde says:

====================
pull-request: can-next 2020-09-30

this is a pull request of 13 patches for net-next.

The first 10 target the mcp25xxfd driver (which is renamed to mcp251xfd during
this series).

The first two patches are by Thomas Kopp, which adds reference to the just
related errata and updates the documentation and log messages.

Dan Carpenter's patch fixes a resource leak during ifdown.

A patch by me adds the missing initialization of a variable.

Oleksij Rempel updates the DT binding documentation as requested by Rob
Herring.

The next 5 patches are by Thomas Kopp and me. During review Geert Uytterhoeven
suggested to use "microchip,mcp251xfd" instead of "microchip,mcp25xxfd" as the
DT autodetection compatible to avoid clashes with future but incompatible
devices. We decided not only to rename the compatible but the whole driver from
"mcp25xxfd" to "mcp251xfd". This is done in several patches.

Joakim Zhang contributes three patches for the flexcan driver. The first one
adds support for the ECC feature, which is implemented on some modern IP cores,
by initializing the controller's memory during ifup. The next patch adds
support for the i.MX8MP (which supports ECC) and the last patch properly
disables the runtime PM if device registration fails.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/can/microchip,mcp25xxfd.yaml → Documentation/devicetree/bindings/net/can/microchip,mcp251xfd.yaml

 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/net/can/microchip,mcp25xxfd.yaml#
+$id: http://devicetree.org/schemas/net/can/microchip,mcp251xfd.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title:
@@ -18,13 +18,13 @@ properties:
         description: for MCP2517FD
       - const: microchip,mcp2518fd
         description: for MCP2518FD
-      - const: microchip,mcp25xxfd
+      - const: microchip,mcp251xfd
         description: to autodetect chip variant
 
   reg:
     maxItems: 1
 
-  interrupts-extended:
+  interrupts:
     maxItems: 1
 
   clocks:
@@ -32,15 +32,13 @@ properties:
 
   vdd-supply:
     description: Regulator that powers the CAN controller.
-    maxItems: 1
 
   xceiver-supply:
     description: Regulator that powers the CAN transceiver.
-    maxItems: 1
 
   microchip,rx-int-gpios:
     description:
-      GPIO phandle of GPIO connected to to INT1 pin of the MCP25XXFD, which
+      GPIO phandle of GPIO connected to to INT1 pin of the MCP251XFD, which
       signals a pending RX interrupt.
     maxItems: 1
 
@@ -52,9 +50,11 @@ properties:
 required:
   - compatible
   - reg
-  - interrupts-extended
+  - interrupts
   - clocks
 
+additionalProperties: false
+
 examples:
   - |
     #include <dt-bindings/gpio/gpio.h>
@@ -65,7 +65,7 @@ examples:
         #size-cells = <0>;
 
         can@0 {
-            compatible = "microchip,mcp25xxfd";
+            compatible = "microchip,mcp251xfd";
             reg = <0>;
             clocks = <&can0_osc>;
             pinctrl-names = "default";

drivers/net/can/flexcan.c

@@ -214,6 +214,7 @@
  *   MX53  FlexCAN2  03.00.00.00    yes        no        no       no        no           no
  *   MX6s  FlexCAN3  10.00.12.00    yes       yes        no       no       yes           no
  *   MX8QM FlexCAN3  03.00.23.00    yes       yes        no       no       yes          yes
+ *   MX8MP FlexCAN3  03.00.17.01    yes       yes        no      yes       yes          yes
  *   VF610 FlexCAN3  ?               no       yes        no      yes       yes?          no
  * LS1021A FlexCAN2  03.00.04.00     no       yes        no       no       yes           no
  * LX2160A FlexCAN3  03.00.23.00     no       yes        no       no       yes          yes
@@ -239,6 +240,8 @@
 #define FLEXCAN_QUIRK_SETUP_STOP_MODE BIT(8)
 /* Support CAN-FD mode */
 #define FLEXCAN_QUIRK_SUPPORT_FD BIT(9)
+/* support memory detection and correction */
+#define FLEXCAN_QUIRK_SUPPORT_ECC BIT(10)
 
 /* Structure of the message buffer */
 struct flexcan_mb {
@@ -292,7 +295,16 @@ struct flexcan_regs {
 	u32 rximr[64];		/* 0x880 - Not affected by Soft Reset */
 	u32 _reserved5[24];	/* 0x980 */
 	u32 gfwr_mx6;		/* 0x9e0 - MX6 */
-	u32 _reserved6[63];	/* 0x9e4 */
+	u32 _reserved6[39];	/* 0x9e4 */
+	u32 _rxfir[6];		/* 0xa80 */
+	u32 _reserved8[2];	/* 0xa98 */
+	u32 _rxmgmask;		/* 0xaa0 */
+	u32 _rxfgmask;		/* 0xaa4 */
+	u32 _rx14mask;		/* 0xaa8 */
+	u32 _rx15mask;		/* 0xaac */
+	u32 tx_smb[4];		/* 0xab0 */
+	u32 rx_smb0[4];		/* 0xac0 */
+	u32 rx_smb1[4];		/* 0xad0 */
 	u32 mecr;		/* 0xae0 */
 	u32 erriar;		/* 0xae4 */
 	u32 erridpr;		/* 0xae8 */
@@ -305,9 +317,13 @@ struct flexcan_regs {
 	u32 fdctrl;		/* 0xc00 - Not affected by Soft Reset */
 	u32 fdcbt;		/* 0xc04 - Not affected by Soft Reset */
 	u32 fdcrc;		/* 0xc08 */
+	u32 _reserved9[199];	/* 0xc0c */
+	u32 tx_smb_fd[18];	/* 0xf28 */
+	u32 rx_smb0_fd[18];	/* 0xf70 */
+	u32 rx_smb1_fd[18];	/* 0xfb8 */
 };
 
-static_assert(sizeof(struct flexcan_regs) == 0x4 + 0xc08);
+static_assert(sizeof(struct flexcan_regs) ==  0x4 * 18 + 0xfb8);
 
 struct flexcan_devtype_data {
 	u32 quirks;		/* quirks needed for different IP cores */
@@ -376,6 +392,13 @@ static const struct flexcan_devtype_data fsl_imx8qm_devtype_data = {
 		FLEXCAN_QUIRK_SUPPORT_FD,
 };
 
+static struct flexcan_devtype_data fsl_imx8mp_devtype_data = {
+	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
+		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_OFF_TIMESTAMP |
+		FLEXCAN_QUIRK_BROKEN_PERR_STATE | FLEXCAN_QUIRK_SETUP_STOP_MODE |
+		FLEXCAN_QUIRK_SUPPORT_FD | FLEXCAN_QUIRK_SUPPORT_ECC,
+};
+
 static const struct flexcan_devtype_data fsl_vf610_devtype_data = {
 	.quirks = FLEXCAN_QUIRK_DISABLE_RXFG | FLEXCAN_QUIRK_ENABLE_EACEN_RRS |
 		FLEXCAN_QUIRK_DISABLE_MECR | FLEXCAN_QUIRK_USE_OFF_TIMESTAMP |
@@ -1292,6 +1315,37 @@ static void flexcan_set_bittiming(struct net_device *dev)
 		return flexcan_set_bittiming_ctrl(dev);
 }
 
+static void flexcan_ram_init(struct net_device *dev)
+{
+	struct flexcan_priv *priv = netdev_priv(dev);
+	struct flexcan_regs __iomem *regs = priv->regs;
+	u32 reg_ctrl2;
+
+	/* 11.8.3.13 Detection and correction of memory errors:
+	 * CTRL2[WRMFRZ] grants write access to all memory positions
+	 * that require initialization, ranging from 0x080 to 0xADF
+	 * and from 0xF28 to 0xFFF when the CAN FD feature is enabled.
+	 * The RXMGMASK, RX14MASK, RX15MASK, and RXFGMASK registers
+	 * need to be initialized as well. MCR[RFEN] must not be set
+	 * during memory initialization.
+	 */
+	reg_ctrl2 = priv->read(&regs->ctrl2);
+	reg_ctrl2 |= FLEXCAN_CTRL2_WRMFRZ;
+	priv->write(reg_ctrl2, &regs->ctrl2);
+
+	memset_io(&regs->mb[0][0], 0,
+		  offsetof(struct flexcan_regs, rx_smb1[3]) -
+		  offsetof(struct flexcan_regs, mb[0][0]) + 0x4);
+
+	if (priv->can.ctrlmode & CAN_CTRLMODE_FD)
+		memset_io(&regs->tx_smb_fd[0], 0,
+			  offsetof(struct flexcan_regs, rx_smb1_fd[17]) -
+			  offsetof(struct flexcan_regs, tx_smb_fd[0]) + 0x4);
+
+	reg_ctrl2 &= ~FLEXCAN_CTRL2_WRMFRZ;
+	priv->write(reg_ctrl2, &regs->ctrl2);
+}
+
 /* flexcan_chip_start
  *
  * this functions is entered with clocks enabled
@@ -1316,6 +1370,9 @@ static int flexcan_chip_start(struct net_device *dev)
 	if (err)
 		goto out_chip_disable;
 
+	if (priv->devtype_data->quirks & FLEXCAN_QUIRK_SUPPORT_ECC)
+		flexcan_ram_init(dev);
+
 	flexcan_set_bittiming(dev);
 
 	/* MCR
@@ -1845,6 +1902,7 @@ static int flexcan_setup_stop_mode(struct platform_device *pdev)
 
 static const struct of_device_id flexcan_of_match[] = {
 	{ .compatible = "fsl,imx8qm-flexcan", .data = &fsl_imx8qm_devtype_data, },
+	{ .compatible = "fsl,imx8mp-flexcan", .data = &fsl_imx8mp_devtype_data, },
 	{ .compatible = "fsl,imx6q-flexcan", .data = &fsl_imx6q_devtype_data, },
 	{ .compatible = "fsl,imx28-flexcan", .data = &fsl_imx28_devtype_data, },
 	{ .compatible = "fsl,imx53-flexcan", .data = &fsl_imx25_devtype_data, },
@@ -1999,6 +2057,8 @@ static int flexcan_probe(struct platform_device *pdev)
 	return 0;
 
  failed_register:
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
 	free_candev(dev);
 	return err;
 }

drivers/net/can/spi/Kconfig

@@ -13,6 +13,6 @@ config CAN_MCP251X
 	  Driver for the Microchip MCP251x and MCP25625 SPI CAN
 	  controllers.
 
-source "drivers/net/can/spi/mcp25xxfd/Kconfig"
+source "drivers/net/can/spi/mcp251xfd/Kconfig"
 
 endmenu

drivers/net/can/spi/Makefile

@@ -6,4 +6,4 @@
 
 obj-$(CONFIG_CAN_HI311X)	+= hi311x.o
 obj-$(CONFIG_CAN_MCP251X)	+= mcp251x.o
-obj-y				+= mcp25xxfd/
+obj-y				+= mcp251xfd/

drivers/net/can/spi/mcp25xxfd/Kconfig → drivers/net/can/spi/mcp251xfd/Kconfig

 # SPDX-License-Identifier: GPL-2.0-only
 
-config CAN_MCP25XXFD
-	tristate "Microchip MCP25xxFD SPI CAN controllers"
+config CAN_MCP251XFD
+	tristate "Microchip MCP251xFD SPI CAN controllers"
 	select REGMAP
 	help
-	  Driver for the Microchip MCP25XXFD SPI FD-CAN controller
+	  Driver for the Microchip MCP251XFD SPI FD-CAN controller
 	  family.
 
-config CAN_MCP25XXFD_SANITY
-	depends on CAN_MCP25XXFD
+config CAN_MCP251XFD_SANITY
+	depends on CAN_MCP251XFD
 	bool "Additional Sanity Checks"
 	help
 	  This option enables additional sanity checks in the driver,

drivers/net/can/spi/mcp251xfd/Makefile

+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_CAN_MCP251XFD) += mcp251xfd.o
+
+mcp251xfd-objs :=
+mcp251xfd-objs += mcp251xfd-core.o
+mcp251xfd-objs += mcp251xfd-crc16.o
+mcp251xfd-objs += mcp251xfd-regmap.o

drivers/net/can/spi/mcp25xxfd/mcp25xxfd-crc16.c → drivers/net/can/spi/mcp251xfd/mcp251xfd-crc16.c

 // SPDX-License-Identifier: GPL-2.0
 //
-// mcp25xxfd - Microchip MCP25xxFD Family CAN controller driver
+// mcp251xfd - Microchip MCP251xFD Family CAN controller driver
 //
 // Copyright (c) 2020 Pengutronix,
 //                    Marc Kleine-Budde <kernel@pengutronix.de>
@@ -12,7 +12,7 @@
 // Copyright (c) 2019 Martin Sperl <kernel@martin.sperl.org>
 //
 
-#include "mcp25xxfd.h"
+#include "mcp251xfd.h"
 
 /* The standard crc16 in linux/crc16.h is unfortunately not computing
  * the correct results (left shift vs. right shift). So here an
@@ -20,7 +20,7 @@
  *
  * http://lkml.iu.edu/hypermail/linux/kernel/0508.1/1085.html
  */
-static const u16 mcp25xxfd_crc16_table[] = {
+static const u16 mcp251xfd_crc16_table[] = {
 	0x0000, 0x8005, 0x800f, 0x000a, 0x801b, 0x001e, 0x0014, 0x8011,
 	0x8033, 0x0036, 0x003c, 0x8039, 0x0028, 0x802d, 0x8027, 0x0022,
 	0x8063, 0x0066, 0x006c, 0x8069, 0x0078, 0x807d, 0x8077, 0x0072,
@@ -55,35 +55,35 @@ static const u16 mcp25xxfd_crc16_table[] = {
 	0x8213, 0x0216, 0x021c, 0x8219, 0x0208, 0x820d, 0x8207, 0x0202
 };
 
-static inline u16 mcp25xxfd_crc16_byte(u16 crc, const u8 data)
+static inline u16 mcp251xfd_crc16_byte(u16 crc, const u8 data)
 {
 	u8 index = (crc >> 8) ^ data;
 
-	return (crc << 8) ^ mcp25xxfd_crc16_table[index];
+	return (crc << 8) ^ mcp251xfd_crc16_table[index];
 }
 
-static u16 mcp25xxfd_crc16(u16 crc, u8 const *buffer, size_t len)
+static u16 mcp251xfd_crc16(u16 crc, u8 const *buffer, size_t len)
 {
 	while (len--)
-		crc = mcp25xxfd_crc16_byte(crc, *buffer++);
+		crc = mcp251xfd_crc16_byte(crc, *buffer++);
 
 	return crc;
 }
 
-u16 mcp25xxfd_crc16_compute(const void *data, size_t data_size)
+u16 mcp251xfd_crc16_compute(const void *data, size_t data_size)
 {
 	u16 crc = 0xffff;
 
-	return mcp25xxfd_crc16(crc, data, data_size);
+	return mcp251xfd_crc16(crc, data, data_size);
 }
 
-u16 mcp25xxfd_crc16_compute2(const void *cmd, size_t cmd_size,
+u16 mcp251xfd_crc16_compute2(const void *cmd, size_t cmd_size,
 			     const void *data, size_t data_size)
 {
 	u16 crc;
 
-	crc = mcp25xxfd_crc16_compute(cmd, cmd_size);
-	crc = mcp25xxfd_crc16(crc, data, data_size);
+	crc = mcp251xfd_crc16_compute(cmd, cmd_size);
+	crc = mcp251xfd_crc16(crc, data, data_size);
 
 	return crc;
 }

drivers/net/can/spi/mcp25xxfd/Makefile

-# SPDX-License-Identifier: GPL-2.0-only
-
-obj-$(CONFIG_CAN_MCP25XXFD) += mcp25xxfd.o
-
-mcp25xxfd-objs :=
-mcp25xxfd-objs += mcp25xxfd-core.o
-mcp25xxfd-objs += mcp25xxfd-crc16.o
-mcp25xxfd-objs += mcp25xxfd-regmap.o