linux-kernel - Re: [PATCH v2] tpm: cr50: Add new device/vendor ID 0x504a6666

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Date:   Wed, 20 Apr 2022 10:17:51 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     "Jes B. Klinke" <jbk@...omium.org>, linux-integrity@...r.kernel.org
Cc:     Paul Menzel <pmenzel@...gen.mpg.de>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Peter Huewe <peterhuewe@....de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] tpm: cr50: Add new device/vendor ID 0x504a6666

On Tue, 2022-04-19 at 16:37 -0700, Jes B. Klinke wrote:
> Accept one additional numerical value of DID:VID for next generation
> Google TPM with new firmware, to be used in future Chromebooks.
> 
> The TPM with the new firmware has the code name TI50, and is going to
> use the same interfaces.
> 
> Signed-off-by: Jes B. Klinke <jbk@...omium.org>
> Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>
> ---
> 
>  drivers/char/tpm/tpm_tis_i2c_cr50.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c
> index f6c0affbb4567..4ddb8ff3a8569 100644
> --- a/drivers/char/tpm/tpm_tis_i2c_cr50.c
> +++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c
> @@ -31,6 +31,7 @@
>  #define TPM_CR50_TIMEOUT_SHORT_MS      2               /* Short timeout during transactions */
>  #define TPM_CR50_TIMEOUT_NOIRQ_MS      20              /* Timeout for TPM ready without IRQ */
>  #define TPM_CR50_I2C_DID_VID           0x00281ae0L     /* Device and vendor ID reg value */
> +#define TPM_TI50_I2C_DID_VID           0x504a6666L     /* Device and vendor ID reg value */
>  #define TPM_CR50_I2C_MAX_RETRIES       3               /* Max retries due to I2C errors */
>  #define TPM_CR50_I2C_RETRY_DELAY_LO    55              /* Min usecs between retries on I2C */
>  #define TPM_CR50_I2C_RETRY_DELAY_HI    65              /* Max usecs between retries on I2C */
> @@ -742,15 +743,15 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client)
>         }
>  
>         vendor = le32_to_cpup((__le32 *)buf);
> -       if (vendor != TPM_CR50_I2C_DID_VID) {
> +       if (vendor != TPM_CR50_I2C_DID_VID && vendor != TPM_TI50_I2C_DID_VID) {
>                 dev_err(dev, "Vendor ID did not match! ID was %08x\n", vendor);
>                 tpm_cr50_release_locality(chip, true);
>                 return -ENODEV;
>         }
>  
> -       dev_info(dev, "cr50 TPM 2.0 (i2c 0x%02x irq %d id 0x%x)\n",
> +       dev_info(dev, "%s TPM 2.0 (i2c 0x%02x irq %d id 0x%x)\n",
> +                vendor == TPM_TI50_I2C_DID_VID ? "ti50" : "cr50",
>                  client->addr, client->irq, vendor >> 16);
> -
>         return tpm_chip_register(chip);
>  }
>  

Thank you, I just picked this.

BR, Jarkko