linux-kernel - Re: [RFC PATCH 1/1] ACPI / PMIC: Add i2c address to intel_pmic

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Date:   Tue, 19 Oct 2021 20:56:04 +0900
From:   Tsuchiya Yuto <kitakar@...il.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Tsuchiya Yuto <kitakar@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Andy Shevchenko <andy@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 1/1] ACPI / PMIC: Add i2c address to
 intel_pmic_bytcrc driver

On Mon, 2021-10-18 at 11:16 +0200, Hans de Goede wrote:
> Hi,
> 
> On 10/17/21 18:15, Tsuchiya Yuto wrote:
> > On Microsoft Surface 3 (uses Intel's Atom Cherry Trail SoC), executing
> > intel_soc_pmic_exec_mipi_pmic_seq_element() results in the following
> > error message:
> > 
> >         [ 7196.356682] intel_soc_pmic_exec_mipi_pmic_seq_element: Not implemented
> >         [ 7196.356686] intel_soc_pmic_exec_mipi_pmic_seq_element: i2c-addr: 0x6e reg-addr 0x57 value 0x63 mask 0xff
> > 
> > Surface 3 uses the PMIC device INT33FD, and the DSDT describes its _HRV
> > value is 0x02 [1]:
> > 
> >         Scope (PCI0.I2C7)
> >         {
> >             Device (PMIC)
> >             {
> >                 Name (_ADR, Zero)  // _ADR: Address
> >                 Name (_HID, "INT33FD" /* Intel Baytrail Power Management IC */)  // _HID: Hardware ID
> >                 Name (_CID, "INT33FD" /* Intel Baytrail Power Management IC */)  // _CID: Compatible ID
> >                 Name (_DDN, "CRYSTAL COVE+ AIC")  // _DDN: DOS Device Name
> >                 Name (_HRV, 0x02)  // _HRV: Hardware Revision
> >                 Name (_UID, One)  // _UID: Unique ID
> >                 Name (_DEP, Package (0x01)  // _DEP: Dependencies
> >                 {
> >                     I2C7
> >                 })
> >         [...]
> > 
> > Due to this _HRV value, intel_pmic_bytcrc is used as the PMIC driver.
> > However, the i2c address is currently not defined in this driver.
> > This commit adds the missing i2c address 0x6e to the intel_pmic_bytcrc
> > driver.
> > 
> > [1] https://github.com/linux-surface/acpidumps/blob/f8db3d150815aa21530635b7e646eee271e3b8fe/surface_3/dsdt.dsl#L10868
> > 
> > References: cc0594c4b0ef ("ACPI / PMIC: Add i2c address for thermal control")
> > Signed-off-by: Tsuchiya Yuto <kitakar@...il.com>
> 
> I believe that it is very unlikely that a device with a Cherry Trail SoC is actually using
> the Bay Trail version of the PMIC, I would expect that to not necessarily work all that well.
> 
> So as Andy said, the right fix here is something like the:
> 
> +	hrv = 0x03;
> 
> Workaround from your cover-letter.
> 
> As Andy said we could use a DMI quirk for this, but chances are that the Microsoft Surface
> DSDT is not the only one with the wrong HRV value. So instead it might be better to
> just test for the SoC type as the attached patch does.
> 
> Tsuchiya, can you give the attached patch a try.

Thanks!

I tried your attached patch, and I can confirm that it's working as
expected.

Now it's using cht one:

        $ ls /sys/devices/pci0000:00/808622C1:05/i2c-5/i2c-INT33FD:00
        cht_crystal_cove_pmic  crystal_cove_gpio  crystal_cove_pwm  driver  firmware_node  modalias  name  power  subsystem  uevent

and the function intel_soc_pmic_exec_mipi_pmic_seq_element() is also
working with atomisp driver.

Regards,
Tsuchiya Yuto