Message-ID: <f2efb5b0-54e6-6e70-2778-657400267463@linux.intel.com>
Date: Fri, 12 Apr 2024 17:09:16 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Parker Newman <parker@...est.io>
cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
    Jiri Slaby <jirislaby@...nel.org>, LKML <linux-kernel@...r.kernel.org>, 
    linux-serial <linux-serial@...r.kernel.org>, 
    Parker Newman <pnewman@...necttech.com>
Subject: Re: [PATCH v2 5/7] serial: exar: add some CTI helper functions

On Fri, 12 Apr 2024, Parker Newman wrote:

> On Fri, 12 Apr 2024 13:48:56 +0300 (EEST)
> Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com> wrote:
> 
> > On Thu, 11 Apr 2024, parker@...est.io wrote:
> > 
> > > From: Parker Newman <pnewman@...necttech.com>
> > > 
> > > - Adds various helper functions for CTI boards.
> > > - Add osc_freq and pcidev to struct exar8250
> > > - Added a exar_get_nr_ports function
> > > 
> > > Signed-off-by: Parker Newman <pnewman@...necttech.com>
> > > ---
> > >  drivers/tty/serial/8250/8250_exar.c | 363 +++++++++++++++++++++++++++-
> > >  1 file changed, 357 insertions(+), 6 deletions(-)
> > > 
> > > diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
> > > index b30f3855652a..6f3697e34722 100644
> > > --- a/drivers/tty/serial/8250/8250_exar.c
> > > +++ b/drivers/tty/serial/8250/8250_exar.c
> > > @@ -137,6 +137,9 @@
> > >  #define UART_EXAR_REGB_EE_ADDR_SIZE     6
> > >  #define UART_EXAR_REGB_EE_DATA_SIZE     16
> > > 
> > > +#define UART_EXAR_XR17C15X_PORT_OFFSET  0x200
> > > +#define UART_EXAR_XR17V25X_PORT_OFFSET  0x200
> > > +#define UART_EXAR_XR17V35X_PORT_OFFSET  0x400
> > > 
> > >  /*
> > >   * IOT2040 MPIO wiring semantics:
> > > @@ -173,6 +176,46 @@
> > >  #define IOT2040_UARTS_ENABLE		0x03
> > >  #define IOT2040_UARTS_GPIO_HI_MODE	0xF8	/* enable & LED as outputs */
> > > 
> > > +/* CTI EEPROM offsets */
> > > +#define CTI_EE_OFF_XR17C15X_OSC_FREQ	0x04  /* 2 words (4 bytes) */
> > > +#define CTI_EE_OFF_XR17V25X_OSC_FREQ    0x08  /* 2 words (4 bytes) */
> > > +#define CTI_EE_OFF_XR17C15X_PART_NUM    0x0A  /* 4 words (8 bytes) */
> > > +#define CTI_EE_OFF_XR17V25X_PART_NUM    0x0E  /* 4 words (8 bytes) */
> > > +#define CTI_EE_OFF_XR17C15X_SERIAL_NUM  0x0E  /* 1 word  (2 bytes) */
> > > +#define CTI_EE_OFF_XR17V25X_SERIAL_NUM  0x12  /* 1 word  (2 bytes) */
> > > +#define CTI_EE_OFF_XR17V35X_SERIAL_NUM  0x11  /* 2 word  (4 bytes) */
> > > +#define CTI_EE_OFF_XR17V35X_BOARD_FLAGS 0x13  /* 1 word  (2 bytes) */  
> > 
> > I'm not convinced but words and bytes is really needed.
> > 
> > > +#define CTI_EE_OFF_XR17V35X_PORT_FLAGS	0x14  /* 1 word (per port) */  
> > 
> > There's something wrong with alignment of more than one define above.
> > 
> > > +
> > > +#define CTI_FPGA_RS485_IO_REG		0x2008
> > > +
> > > +#define CTI_DEFAULT_PCI_OSC_FREQ	29491200
> > > +#define CTI_DEFAULT_PCIE_OSC_FREQ	125000000
> > > +#define CTI_DEFAULT_FPGA_OSC_FREQ	33333333
> > > +
> > > +/*
> > > + * CTI Serial port line types. These match the values stored in the first
> > > + * nibble of the CTI EEPROM port_flags word.
> > > + */
> > > +enum cti_port_type {
> > > +	CTI_PORT_TYPE_NONE = 0,
> > > +	CTI_PORT_TYPE_RS232,            //RS232 ONLY
> > > +	CTI_PORT_TYPE_RS422_485,        //RS422/RS485 ONLY
> > > +	CTI_PORT_TYPE_RS232_422_485_HW, //RS232/422/485 HW ONLY Switchable
> > > +	CTI_PORT_TYPE_RS232_422_485_SW, //RS232/422/485 SW ONLY Switchable
> > > +	CTI_PORT_TYPE_RS232_422_485_4B, //RS232/422/485 HW/SW (4bit ex. BCG004)
> > > +	CTI_PORT_TYPE_RS232_422_485_2B, //RS232/422/485 HW/SW (2bit ex. BBG008)
> > > +	CTI_PORT_TYPE_MAX,
> > > +};
> > > +
> > > +#define CTI_PORT_TYPE_VALID(_port_type) \
> > > +	(((_port_type) > CTI_PORT_TYPE_NONE) && \
> > > +	((_port_type) < CTI_PORT_TYPE_MAX))
> > > +
> > > +#define CTI_PORT_TYPE_RS485(_port_type) \
> > > +	(((_port_type) > CTI_PORT_TYPE_RS232) && \
> > > +	((_port_type) < CTI_PORT_TYPE_MAX))
> > > +
> > >  struct exar8250;
> > > 
> > >  struct exar8250_platform {
> > > @@ -202,6 +245,8 @@ struct exar8250_board {
> > > 
> > >  struct exar8250 {
> > >  	unsigned int		nr;
> > > +	unsigned int            osc_freq;
> > > +	struct pci_dev		*pcidev;
> > >  	struct exar8250_board	*board;
> > >  	void __iomem		*virt;
> > >  	int			line[];
> > > @@ -557,6 +602,279 @@ pci_fastcom335_setup(struct exar8250 *priv, struct pci_dev *pcidev,
> > >  	return 0;
> > >  }
> > > 
> > > +/**
> > > + * cti_set_tristate() - Enable/Disable RS485 transciever tristate
> > > + * @priv: Device's private structure
> > > + * @port_num: Port number to set tristate on/off
> > > + * @enable: Enable tristate if true, disable if false
> > > + *
> > > + * Most RS485 capable cards have a power on tristate jumper/switch that ensures
> > > + * the RS422/RS485 transciever does not drive a multi-drop RS485 bus when it is
> > > + * not the master. When this jumper is installed the user must set the RS485
> > > + * mode to disable tristate prior to using the port.
> > > + *
> > > + * Some Exar UARTs have an auto-tristate feature while others require setting
> > > + * an MPIO to disable the tristate.
> > > + *
> > > + * Return: 0 on success, negative error code on failure
> > > + */
> > > +static int cti_set_tristate(struct exar8250 *priv,
> > > +			unsigned int port_num, bool enable)
> > > +{
> > > +	int ret = 0;
> > > +
> > > +	if (!priv || (port_num >= priv->nr))
> > > +		return -EINVAL;
> > > +
> > > +	//Only Exar based cards use MPIO, return 0 otherwise
> > > +	if (priv->pcidev->vendor != PCI_VENDOR_ID_EXAR)
> > > +		return 0;
> > > +
> > > +	pci_dbg(priv->pcidev, "%s tristate for port %u\n",
> > > +		(enable ? "enabling" : "disabling"), port_num);  
> > 
> > dev_dbg()
> > 
> > Rephrasing the string slightly, you could consider using 
> > str_enable_disable() from linux/string_choices.h
> > 
> > > +
> > > +	ret = exar_mpio_set(priv, port_num, !enable);
> > > +	if (ret)
> > > +		return ret;
> > > +
> > > +	//ensure MPIO is an output
> > > +	ret = exar_mpio_config(priv, port_num, true);
> > > +
> > > +	return ret;
> > > +}
> > > +
> > > +/**
> > > + * cti_set_plx_int_enable() - Enable/Disable PCI interrupts
> > > + * @priv: Device's private structure
> > > + * @enable: Enable interrupts if true, disable if false
> > > + *
> > > + * Some older CTI cards require MPIO_0 to be set low to enable the PCI
> > > + * interupts from the UART to the PLX PCI->PCIe bridge.
> > > + *
> > > + * Return: 0 on success, negative error code on failure
> > > + */
> > > +static int cti_set_plx_int_enable(struct exar8250 *priv, bool enable)
> > > +{
> > > +	int ret = 0;
> > > +
> > > +	if (!priv)
> > > +		return -EINVAL;
> > > +
> > > +	//Only Exar based cards use MPIO, return 0 otherwise
> > > +	if (priv->pcidev->vendor != PCI_VENDOR_ID_EXAR)
> > > +		return 0;
> > > +
> > > +	pci_dbg(priv->pcidev, "%s plx fix\n",
> > > +		(enable ? "enabling" : "disabling"));
> > > +
> > > +	//INT enabled when MPIO0 is LOW
> > > +	ret = exar_mpio_set(priv, 0, !enable);
> > > +	if (ret)
> > > +		return ret;
> > > +
> > > +	//ensure MPIO is an output
> > > +	ret = exar_mpio_config(priv, 0, true);
> > > +
> > > +	return ret;
> > > +}
> > > +
> > > +/**
> > > + * cti_read_osc_freq() - Read the UART oscillator frequency from EEPROM
> > > + * @priv: Device's private structure  
> > 
> > Missing second parameter.
> > 
> > > + *
> > > + * CTI XR17x15X and XR17V25X cards have the serial boards oscillator frequency
> > > + * stored in the EEPROM. FPGA and XR17V35X based cards use the PCI/PCIe clock.
> > > + *
> > > + * Return: frequency on success, negative error code on failure
> > > + */
> > > +static int cti_read_osc_freq(struct exar8250 *priv, uint8_t eeprom_offset)
> > > +{
> > > +	int osc_freq;
> > > +
> > > +	if (!priv)
> > > +		return -EINVAL;
> > > +
> > > +	osc_freq = (exar_ee_read(priv, eeprom_offset));  
> > 
> > Unnecessary parenthesis.
> > 
> > > +	osc_freq |= (exar_ee_read(priv, (eeprom_offset + 1)) << 16);  
> > 
> > Add the field #define with GENMASK() and use FIELD_PREP() here? Perhaps 
> > both lines should use FIELD_PREP() even if one of them has 0 shift.
> > 
> > > +
> > > +	//check if EEPROM word was blank
> > > +	if ((osc_freq == 0xFFFF) || (osc_freq == 0x0000))
> > > +		return -EIO;
> > > +
> > > +	pci_dbg(priv->pcidev, "osc_freq from EEPROM %d\n", osc_freq);
> > > +
> > > +	return osc_freq;
> > > +}
> > > +
> > > +/**
> > > + * cti_get_port_type_xr17c15x_xr17v25x() - Get the port type of a xr17c15x
> > > + * or xr17v25x card  
> > 
> > I suppose this shorter version would be enough to provide the same amount  
> > information:
> > 
> > Get the port type of xr17c15x/xr17v25x
> > 
> > > + *  
> > 
> > No empty line.
> > 
> > > + * @priv: Device's private structure
> > > + * @port_num: Port to get type of
> > > + *
> > > + * CTI xr17c15x and xr17v25x based cards port types are based on PCI IDs
> > > + *
> > > + * Return: port type on success, CTI_PORT_TYPE_NONE on failure
> > > + */
> > > +static enum cti_port_type cti_get_port_type_xr17c15x_xr17v25x(struct exar8250 *priv,
> > > +							unsigned int port_num)
> > > +{
> > > +	enum cti_port_type port_type;
> > > +
> > > +	if (!priv)
> > > +		return CTI_PORT_TYPE_NONE;  
> > 
> > Can this happen?
> > 
> > > +	switch (priv->pcidev->subsystem_device) {
> > > +	//RS232 only cards
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_232:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_232:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_232:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_232_NS:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_232_NS:
> > > +		port_type = CTI_PORT_TYPE_RS232;
> > > +		break;
> > > +	//1x RS232, 1x RS422/RS485
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_1_1:
> > > +		port_type = (port_num == 0) ?
> > > +			CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
> > > +		break;
> > > +	//2x RS232, 2x RS422/RS485
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_2:
> > > +		port_type = (port_num < 2) ?
> > > +			CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
> > > +		break;
> > > +	//4x RS232, 4x RS422/RS485
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_SP:
> > > +		port_type = (port_num < 4) ?
> > > +			CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
> > > +		break;
> > > +	//RS232/RS422/RS485 HW (jumper) selectable
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_SP_OPTO:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_A:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_SP_OPTO_B:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_A:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_B:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_A:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_16_XPRS_B:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XPRS_OPTO:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_A:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XPRS_OPTO_B:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_LEFT:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_XP_OPTO_RIGHT:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_XP_OPTO:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_4_XPRS_OPTO:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP:
> > > +		port_type = CTI_PORT_TYPE_RS232_422_485_HW;
> > > +		break;
> > > +	//RS422/RS485 HW (jumper) selectable
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_485:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_4_485:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_485:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_SP_485:
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_8_XPRS_LP_485:
> > > +		port_type = CTI_PORT_TYPE_RS422_485;
> > > +		break;
> > > +	//6x RS232, 2x RS422/RS485
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_6_2_SP:
> > > +		port_type = (port_num < 6) ?
> > > +			CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
> > > +		break;
> > > +	//2x RS232, 6x RS422/RS485
> > > +	case PCI_SUBDEVICE_ID_CONNECT_TECH_PCI_UART_2_6_SP:
> > > +		port_type = (port_num < 2) ?
> > > +			CTI_PORT_TYPE_RS232 : CTI_PORT_TYPE_RS422_485;
> > > +		break;
> > > +	default:
> > > +		pci_err(priv->pcidev, "unknown/unsupported device\n");
> > > +		port_type = CTI_PORT_TYPE_NONE;
> > > +	}
> > > +
> > > +	return port_type;
> > > +}
> > > +
> > > +/**
> > > + * cti_get_port_type_fpga() - Get the port type of a CTI FPGA card
> > > + * @priv: Device's private structure
> > > + * @port_num: Port to get type of
> > > + *
> > > + * FPGA based cards port types are based on PCI IDs
> > > + *
> > > + * Return: port type on success, CTI_PORT_TYPE_NONE on failure
> > > + */
> > > +static enum cti_port_type cti_get_port_type_fpga(struct exar8250 *priv,
> > > +						unsigned int port_num)
> > > +{
> > > +	enum cti_port_type port_type;
> > > +
> > > +	if (!priv)
> > > +		return CTI_PORT_TYPE_NONE;
> > > +
> > > +	switch (priv->pcidev->device) {
> > > +	case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG00X:
> > > +	case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG01X:
> > > +	case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_16:
> > > +		port_type = CTI_PORT_TYPE_RS232_422_485_HW;
> > > +		break;
> > > +	default:
> > > +		pci_err(priv->pcidev, "unknown/unsupported device\n");  
> > 
> > dev_err()
> > 
> > > +		return CTI_PORT_TYPE_NONE;
> > > +	}
> > > +
> > > +	return port_type;
> > > +}
> > > +
> > > +/**
> > > + * cti_get_port_type_xr17v35x() - Read port type from the EEPROM
> > > + * @priv: Device's private structure
> > > + * @port_num: port offset
> > > + *
> > > + * CTI XR17V35X based cards have the port types stored in the EEPROM.
> > > + * This function reads the port type for a single port.
> > > + *
> > > + * Return: port type on success, CTI_PORT_TYPE_NONE on failure
> > > + */
> > > +static enum cti_port_type cti_get_port_type_xr17v35x(struct exar8250 *priv,
> > > +						unsigned int port_num)
> > > +{
> > > +	uint16_t port_flags;
> > > +	uint8_t offset;
> > > +	enum cti_port_type port_type;
> > > +
> > > +	if (!priv)
> > > +		return CTI_PORT_TYPE_NONE;
> > > +
> > > +	offset = CTI_EE_OFF_XR17V35X_PORT_FLAGS + port_num;
> > > +	port_flags = exar_ee_read(priv, offset);
> > > +
> > > +	port_type = (port_flags & 0x00FF);  
> > 
> > Add named define with GENMASK() and use FIELD_GET()
> > 
> > > +
> > > +	if (!CTI_PORT_TYPE_VALID(port_type)) {
> > > +		/*
> > > +		 * If the port type is missing the card assume it is a
> > > +		 * RS232/RS422/RS485 card to be safe.
> > > +		 *
> > > +		 * There is one known board (BEG013) that only has
> > > +		 * 3 of 4 port types written to the EEPROM so this
> > > +		 * acts as a work around.
> > > +		 */
> > > +		pci_warn(priv->pcidev,  
> > 
> > dev_warn(). Please fix all pci_xx() logging, I won't flag them from this 
> > point onwards.
> > 
> > > +			"failed to get port %d type from EEPROM\n", port_num);
> > > +		port_type = CTI_PORT_TYPE_RS232_422_485_HW;
> > > +	}
> > > +
> > > +	return port_type;
> > > +}
> > > +
> > >  static int
> > >  pci_connect_tech_setup(struct exar8250 *priv, struct pci_dev *pcidev,
> > >  		       struct uart_8250_port *port, int idx)
> > > @@ -914,6 +1232,39 @@ static irqreturn_t exar_misc_handler(int irq, void *data)
> > >  	return IRQ_HANDLED;
> > >  }
> > > 
> > > +static unsigned int exar_get_nr_ports(struct exar8250_board *board,
> > > +					struct pci_dev *pcidev)
> > > +{
> > > +	unsigned int nr_ports = 0;
> > > +
> > > +	if (!board || !pcidev)
> > > +		return 0;
> > > +
> > > +	if (pcidev->vendor == PCI_VENDOR_ID_ACCESSIO) {
> > > +		nr_ports = BIT(((pcidev->device & 0x38) >> 3) - 1);
> > > +	} else if (board->num_ports > 0) {
> > > +		//Check if board struct overrides number of ports
> > > +		nr_ports = board->num_ports;
> > > +	} else if (pcidev->vendor == PCI_VENDOR_ID_EXAR) {
> > > +		//Exar encodes # ports in last nibble of PCI Device ID ex. 0358
> > > +		nr_ports = pcidev->device & 0x0f;
> > > +	} else  if (pcidev->vendor == PCI_VENDOR_ID_CONNECT_TECH) {
> > > +		//Handle CTI FPGA cards
> > > +		switch (pcidev->device) {
> > > +		case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG00X:
> > > +		case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_12_XIG01X:
> > > +			nr_ports = 12;
> > > +			break;
> > > +		case PCI_DEVICE_ID_CONNECT_TECH_PCI_XR79X_16:
> > > +			nr_ports = 16;
> > > +		default:
> > > +			break;
> > > +		}
> > > +	}
> > > +
> > > +	return nr_ports;
> > > +}
> > > +
> > >  static int
> > >  exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
> > >  {
> > > @@ -933,18 +1284,18 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
> > > 
> > >  	maxnr = pci_resource_len(pcidev, bar) >> (board->reg_shift + 3);
> > > 
> > > -	if (pcidev->vendor == PCI_VENDOR_ID_ACCESSIO)
> > > -		nr_ports = BIT(((pcidev->device & 0x38) >> 3) - 1);
> > > -	else if (board->num_ports)
> > > -		nr_ports = board->num_ports;
> > > -	else
> > > -		nr_ports = pcidev->device & 0x0f;
> > > +	nr_ports = exar_get_nr_ports(board, pcidev);
> > > +	if (nr_ports == 0) {  
> > 
> > Can you please do this refactoring in a preparatory patch, and only add 
> > the new stuff in this patch into exar_get_nr_ports() patch.
> > 
> 
> I will fix above. 
> 
> Just to clarify By "do this refactoring in a preparatory patch" do you mean: 
> 1. Move existing code to new function in "preparatory patch"
> 2. Add new code to new function in another patch

Yes.

In general, when a patch gets large, moving such trivial changes out 
of it will help review tremendously (and also if somebody has to look into 
the commit history 5-15 years from now).

-- 
 i.

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