Re: [PATCH v10 char-misc-next 1/2] misc: microchip: pci1xxxx: Add support to read and write into PCI1XXXX OTP via NVMEM sysfs

Re: [PATCH v10 char-misc-next 1/2] misc: microchip: pci1xxxx: Add support to read and write into PCI1XXXX OTP via NVMEM sysfs

[Michael Walle]

Hi,

> +static int pci1xxxx_otp_read(void *priv_t, unsigned int off,
> +			     void *buf_t, size_t count)
> +{
> +	struct pci1xxxx_otp_eeprom_device *priv = priv_t;
> +	void __iomem *rb = priv->reg_base;
> +	char *buf = buf_t;
> +	u32 regval;
> +	u32 byte;
> +	int ret;
> +	u8 data;
> +
> +	if (off >= priv->nvmem_config_otp.size)
> +		return -EFAULT;
> +
> +	if ((off + count) > priv->nvmem_config_otp.size)
> +		count = priv->nvmem_config_otp.size - off;
> +
> +	ret = set_sys_lock(priv);
> +	if (ret)
> +		return ret;
> +
> +	for (byte = 0; byte < count; byte++) {
> +		otp_device_set_address(priv, (u16)(off + byte));
> +		data = readl(rb + MMAP_OTP_OFFSET(OTP_FUNC_CMD_OFFSET));
> +		writel(data | OTP_FUNC_RD_BIT,
> +		       rb + MMAP_OTP_OFFSET(OTP_FUNC_CMD_OFFSET));
> +		data = readl(rb + MMAP_OTP_OFFSET(OTP_CMD_GO_OFFSET));
> +		writel(data | OTP_CMD_GO_BIT,
> +		       rb + MMAP_OTP_OFFSET(OTP_CMD_GO_OFFSET));
> +
> +		ret = read_poll_timeout(readl, regval,
> +					!(regval & OTP_STATUS_BUSY_BIT),
> +					STATUS_READ_DELAY_US,
> +					STATUS_READ_TIMEOUT_US, true,
> +					rb + MMAP_OTP_OFFSET(OTP_STATUS_OFFSET));
> +
> +		data = readl(rb + MMAP_OTP_OFFSET(OTP_PASS_FAIL_OFFSET));
> +		if (ret < 0 || data & OTP_FAIL_BIT)
> +			return -EIO;

Don't you need to release the lock?

> +
> +		buf[byte] = readl(rb + MMAP_OTP_OFFSET(OTP_RD_DATA_OFFSET));
> +	}
> +	release_sys_lock(priv);
> +
> +	return byte;
> +}

Re: [PATCH v10 char-misc-next 1/2] misc: microchip: pci1xxxx: Add support to read and write into PCI1XXXX OTP via NVMEM sysfs

[VaibhaavRam.TL]

On Tue, 2023-04-25 at 09:33 +0200, Michael Walle wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you
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> 
> Hi,
> 
> > +static int pci1xxxx_otp_read(void *priv_t, unsigned int off,
> > +                          void *buf_t, size_t count)
> > +{
> > +     struct pci1xxxx_otp_eeprom_device *priv = priv_t;
> > +     void __iomem *rb = priv->reg_base;
> > +     char *buf = buf_t;
> > +     u32 regval;
> > +     u32 byte;
> > +     int ret;
> > +     u8 data;
> > +
> > +     if (off >= priv->nvmem_config_otp.size)
> > +             return -EFAULT;
> > +
> > +     if ((off + count) > priv->nvmem_config_otp.size)
> > +             count = priv->nvmem_config_otp.size - off;
> > +
> > +     ret = set_sys_lock(priv);
> > +     if (ret)
> > +             return ret;
> > +
> > +     for (byte = 0; byte < count; byte++) {
> > +             otp_device_set_address(priv, (u16)(off + byte));
> > +             data = readl(rb +
> > MMAP_OTP_OFFSET(OTP_FUNC_CMD_OFFSET));
> > +             writel(data | OTP_FUNC_RD_BIT,
> > +                    rb + MMAP_OTP_OFFSET(OTP_FUNC_CMD_OFFSET));
> > +             data = readl(rb +
> > MMAP_OTP_OFFSET(OTP_CMD_GO_OFFSET));
> > +             writel(data | OTP_CMD_GO_BIT,
> > +                    rb + MMAP_OTP_OFFSET(OTP_CMD_GO_OFFSET));
> > +
> > +             ret = read_poll_timeout(readl, regval,
> > +                                     !(regval &
> > OTP_STATUS_BUSY_BIT),
> > +                                     STATUS_READ_DELAY_US,
> > +                                     STATUS_READ_TIMEOUT_US, true,
> > +                                     rb +
> > MMAP_OTP_OFFSET(OTP_STATUS_OFFSET));
> > +
> > +             data = readl(rb +
> > MMAP_OTP_OFFSET(OTP_PASS_FAIL_OFFSET));
> > +             if (ret < 0 || data & OTP_FAIL_BIT)
> > +                     return -EIO;
> 
> Don't you need to release the lock?
Yes, release_sys_lock should be done. Will fix in next version of patch
> 
> > +
> > +             buf[byte] = readl(rb +
> > MMAP_OTP_OFFSET(OTP_RD_DATA_OFFSET));
> > +     }
> > +     release_sys_lock(priv);
> > +
> > +     return byte;
> > +}
>