linux-kernel - Re: [PATCH] tpm: tpm_i2c_nuvoton: use correct command duration for TPM 2.x

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Message-Id: <6e12d4b6-cb84-3be5-8a62-6868be43d43d@linux.ibm.com>
Date:   Fri, 19 Oct 2018 10:14:38 +0530
From:   Nayna Jain <nayna@...ux.ibm.com>
To:     Tomas Winkler <tomas.winkler@...el.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     Nayna Jain <nayna@...ux.vnet.ibm.com>,
        Alexander Usyskin <alexander.usyskin@...el.com>,
        Tadeusz Struk <tadeusz.struk@...el.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tpm: tpm_i2c_nuvoton: use correct command duration for
 TPM 2.x



On 10/17/2018 10:02 PM, Tomas Winkler wrote:
> diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
> index caa86b19c76d..f74f451baf6a 100644
> --- a/drivers/char/tpm/tpm_i2c_nuvoton.c
> +++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
> @@ -369,6 +369,7 @@ static int i2c_nuvoton_send(struct tpm_chip *chip, u8 *buf, size_t len)
>   	struct device *dev = chip->dev.parent;
>   	struct i2c_client *client = to_i2c_client(dev);
>   	u32 ordinal;
> +	unsigned long duration;
>   	size_t count = 0;
>   	int burst_count, bytes2write, retries, rc = -EIO;
>
> @@ -455,10 +456,12 @@ static int i2c_nuvoton_send(struct tpm_chip *chip, u8 *buf, size_t len)
>   		return rc;
>   	}
>   	ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
> -	rc = i2c_nuvoton_wait_for_data_avail(chip,
> -					     tpm_calc_ordinal_duration(chip,
> -								       ordinal),
> -					     &priv->read_queue);
> +	if (chip->flags & TPM_CHIP_FLAG_TPM2)
> +		duration = tpm2_calc_ordinal_duration(chip, ordinal);
> +	else
> +		duration = tpm_calc_ordinal_duration(chip, ordinal);
> +
> +	rc = i2c_nuvoton_wait_for_data_avail(chip, duration, &priv->read_queue);
>   	if (rc) {
>   		dev_err(dev, "%s() timeout command duration\n", __func__);
>   		i2c_nuvoton_ready(chip);

I only have Nuvoton TPM 2.0, tested for that.

Reviewed-by: Nayna Jain <nayna@...ux.ibm.com>
Tested-by: Nayna Jain <nayna@...ux.ibm.com> (For TPM 2.0)


Thanks & Regards,
     - Nayna