linux-kernel - Re: [PATCH v6 4/4] i2c: designware: Add doorbell support for Mendocino

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Date:   Mon, 27 Mar 2023 10:37:25 -0600
From:   Mark Hasemeyer <markhas@...omium.org>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     Jan Dąbroś <jsd@...ihalf.com>,
        Grzegorz Bernacki <gjb@...ihalf.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 4/4] i2c: designware: Add doorbell support for Mendocino

>  static int psp_send_i2c_req(enum psp_i2c_req_type i2c_req_type)
>  {
>         struct psp_i2c_req *req;
> @@ -87,7 +101,7 @@ static int psp_send_i2c_req(enum psp_i2c_req_type i2c_req_type)
>         req->type = i2c_req_type;
>
>         start = jiffies;
> -       ret = read_poll_timeout(psp_send_i2c_req_cezanne, status,
> +       ret = read_poll_timeout(_psp_send_i2c_req, status,
>                                 (status != -EBUSY),
>                                 PSP_I2C_REQ_RETRY_DELAY_US,
>                                 PSP_I2C_REQ_RETRY_CNT * PSP_I2C_REQ_RETRY_DELAY_US,
The timeout error handling message after this has "acquire" and
"release" flopped.

> @@ -275,6 +291,13 @@ int i2c_dw_amdpsp_probe_lock_support(struct dw_i2c_dev *dev)
>         if (psp_i2c_dev)
>                 return -EEXIST;
>
> +       /* Cezanne uses platform mailbox, Mendocino and later use doorbell */
> +       rdev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
> +       if (rdev->device == 0x1630)
> +               _psp_send_i2c_req = psp_send_i2c_req_cezanne;
> +       else
> +               _psp_send_i2c_req = psp_send_i2c_req_mendocino;
Thinking about naming again, perhaps "mendocino" should be dropped
from the function name as the logic applies to all platforms except
cezanne.