linux-kernel - Re: [PATCH v2] tpm: Add new device/vendor ID 0x50666666

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Message-ID: <CAK+PMK4yBkqpfJdcQ5M93DKB1-7Wn4zJmx6VmqNghogJJhDa6A@mail.gmail.com>
Date: Fri, 2 Aug 2024 09:19:17 -0600
From: Jett Rink <jettrink@...omium.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: linux-security-module@...r.kernel.org, Jarkko Sakkinen <jarkko@...nel.org>, 
	Jason Gunthorpe <jgg@...pe.ca>, Peter Huewe <peterhuewe@....de>, linux-integrity@...r.kernel.org
Subject: Re: [PATCH v2] tpm: Add new device/vendor ID 0x50666666

Could I get some feedback on this patch please? Is there something I
am not doing correctly?

-Jett

On Thu, Jul 18, 2024 at 2:24 PM Jett Rink <jettrink@...omium.org> wrote:
>
> Accept another DID:VID for the next generation Google TPM. This TPM
> has the same Ti50 firmware and fulfills the same interface.
>
> Signed-off-by: Jett Rink <jettrink@...omium.org>
> ---
>
> Changes in v2:
> Patchset 2 applies cleanly
>
>  drivers/char/tpm/tpm_tis_i2c_cr50.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c
> index adf22992138e..b50005ccfc5e 100644
> --- a/drivers/char/tpm/tpm_tis_i2c_cr50.c
> +++ b/drivers/char/tpm/tpm_tis_i2c_cr50.c
> @@ -31,7 +31,8 @@
>  #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_TI50_DT_I2C_DID_VID                0x504a6666L     /* Device and vendor ID reg value */
> +#define TPM_TI50_OT_I2C_DID_VID                0x50666666L     /* 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 */
> @@ -741,14 +742,18 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client)
>         }
>
>         vendor = le32_to_cpup((__le32 *)buf);
> -       if (vendor != TPM_CR50_I2C_DID_VID && vendor != TPM_TI50_I2C_DID_VID) {
> +       if (vendor != TPM_CR50_I2C_DID_VID &&
> +           vendor != TPM_TI50_DT_I2C_DID_VID &&
> +           vendor != TPM_TI50_OT_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, "%s TPM 2.0 (i2c 0x%02x irq %d id 0x%x)\n",
> -                vendor == TPM_TI50_I2C_DID_VID ? "ti50" : "cr50",
> +                vendor == TPM_CR50_I2C_DID_VID    ? "cr50" :
> +                vendor == TPM_TI50_DT_I2C_DID_VID ? "ti50 DT" :
> +                                                    "ti50 OT",
>                  client->addr, client->irq, vendor >> 16);
>         return tpm_chip_register(chip);
>  }
> --
> 2.45.2.1089.g2a221341d9-goog
>