Merge tag 'linux-can-next-for-6.3-20230206' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next

Marc Kleine-Budde says:

====================
pull-request: can-next 2023-02-06

this is a pull request of 47 patches for net-next/master.

The first two patch is by Oliver Hartkopp. One adds missing error
checking to the CAN_GW protocol, the other adds a missing CAN address
family check to the CAN ISO TP protocol.

Thomas Kopp contributes a performance optimization to the mcp251xfd
driver.

The next 11 patches are by Geert Uytterhoeven and add support for
R-Car V4H systems to the rcar_canfd driver.

Stephane Grosjean and Lukas Magel contribute 8 patches to the peak_usb
driver, which add support for configurable CAN channel ID.

The last 17 patches are by me and target the CAN bit timing
configuration. The bit timing is cleaned up, error messages are
improved and forwarded to user space via NL_SET_ERR_MSG_FMT() instead
of netdev_err(), and the SJW handling is updated, including the
definition of a new default value that will benefit CAN-FD
controllers, by increasing their oscillator tolerance.

* tag 'linux-can-next-for-6.3-20230206' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can-next: (47 commits)
  can: bittiming: can_validate_bitrate(): report error via netlink
  can: bittiming: can_calc_bittiming(): convert from netdev_err() to NL_SET_ERR_MSG_FMT()
  can: bittiming: can_calc_bittiming(): clean up SJW handling
  can: bittiming: can_sjw_set_default(): use Phase Seg2 / 2 as default for SJW
  can: bittiming: can_sjw_check(): check that SJW is not longer than either Phase Buffer Segment
  can: bittiming: can_sjw_check(): report error via netlink and harmonize error value
  can: bittiming: can_fixup_bittiming(): report error via netlink and harmonize error value
  can: bittiming: factor out can_sjw_set_default() and can_sjw_check()
  can: bittiming: can_changelink() pass extack down callstack
  can: netlink: can_changelink(): convert from netdev_err() to NL_SET_ERR_MSG_FMT()
  can: netlink: can_validate(): validate sample point for CAN and CAN-FD
  can: dev: register_candev(): bail out if both fixed bit rates and bit timing constants are provided
  can: dev: register_candev(): ensure that bittiming const are valid
  can: bittiming: can_get_bittiming(): use direct return and remove unneeded else
  can: bittiming: can_fixup_bittiming(): set effective tq
  can: bittiming: can_fixup_bittiming(): use CAN_SYNC_SEG instead of 1
  can: bittiming(): replace open coded variants of can_bit_time()
  can: peak_usb: Reorder include directives alphabetically
  can: peak_usb: align CAN channel ID format in log with sysfs attribute
  can: peak_usb: export PCAN CAN channel ID as sysfs device attribute
  ...
====================

Link: https://lore.kernel.org/r/20230206131620.2758724-1-mkl@pengutronix.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

2 files changed, 36 insertions, 8 deletions

diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c
index bf3f0f150199..bfe4caa0c99d 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-ring.c
@@ -30,11 +30,23 @@ mcp251xfd_cmd_prepare_write_reg(const struct mcp251xfd_priv *priv,
 	last_byte = mcp251xfd_last_byte_set(mask);
 	len = last_byte - first_byte + 1;
 
-	data = mcp251xfd_spi_cmd_write(priv, write_reg_buf, reg + first_byte);
+	data = mcp251xfd_spi_cmd_write(priv, write_reg_buf, reg + first_byte, len);
 	val_le32 = cpu_to_le32(val >> BITS_PER_BYTE * first_byte);
 	memcpy(data, &val_le32, len);
 
-	if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_REG) {
+	if (!(priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_REG)) {
+		len += sizeof(write_reg_buf->nocrc.cmd);
+	} else if (len == 1) {
+		u16 crc;
+
+		/* CRC */
+		len += sizeof(write_reg_buf->safe.cmd);
+		crc = mcp251xfd_crc16_compute(&write_reg_buf->safe, len);
+		put_unaligned_be16(crc, (void *)write_reg_buf + len);
+
+		/* Total length */
+		len += sizeof(write_reg_buf->safe.crc);
+	} else {
 		u16 crc;
 
 		mcp251xfd_spi_cmd_crc_set_len_in_reg(&write_reg_buf->crc.cmd,
@@ -46,8 +58,6 @@ mcp251xfd_cmd_prepare_write_reg(const struct mcp251xfd_priv *priv,
 
 		/* Total length */
 		len += sizeof(write_reg_buf->crc.crc);
-	} else {
-		len += sizeof(write_reg_buf->nocrc.cmd);
 	}
 
 	return len;
diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
index 2b0309fedfac..7024ff0cc2c0 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd.h
@@ -504,6 +504,11 @@ union mcp251xfd_write_reg_buf {
 		u8 data[4];
 		__be16 crc;
 	} crc;
+	struct __packed {
+		struct mcp251xfd_buf_cmd cmd;
+		u8 data[1];
+		__be16 crc;
+	} safe;
 } ____cacheline_aligned;
 
 struct mcp251xfd_tx_obj {
@@ -759,6 +764,13 @@ mcp251xfd_spi_cmd_write_crc_set_addr(struct mcp251xfd_buf_cmd_crc *cmd,
 }
 
 static inline void
+mcp251xfd_spi_cmd_write_safe_set_addr(struct mcp251xfd_buf_cmd *cmd,
+				     u16 addr)
+{
+	cmd->cmd = cpu_to_be16(MCP251XFD_SPI_INSTRUCTION_WRITE_CRC_SAFE | addr);
+}
+
+static inline void
 mcp251xfd_spi_cmd_write_crc(struct mcp251xfd_buf_cmd_crc *cmd,
 			    u16 addr, u16 len)
 {
@@ -769,14 +781,20 @@ mcp251xfd_spi_cmd_write_crc(struct mcp251xfd_buf_cmd_crc *cmd,
 static inline u8 *
 mcp251xfd_spi_cmd_write(const struct mcp251xfd_priv *priv,
 			union mcp251xfd_write_reg_buf *write_reg_buf,
-			u16 addr)
+			u16 addr, u8 len)
 {
 	u8 *data;
 
 	if (priv->devtype_data.quirks & MCP251XFD_QUIRK_CRC_REG) {
-		mcp251xfd_spi_cmd_write_crc_set_addr(&write_reg_buf->crc.cmd,
-						     addr);
-		data = write_reg_buf->crc.data;
+		if (len == 1) {
+			mcp251xfd_spi_cmd_write_safe_set_addr(&write_reg_buf->safe.cmd,
+							     addr);
+			data = write_reg_buf->safe.data;
+		} else {
+			mcp251xfd_spi_cmd_write_crc_set_addr(&write_reg_buf->crc.cmd,
+							     addr);
+			data = write_reg_buf->crc.data;
+		}
 	} else {
 		mcp251xfd_spi_cmd_write_nocrc(&write_reg_buf->nocrc.cmd,
 					      addr);