Broadcom Wi-Fi/Bluetooth on GPIO? (Baytrail tablet)

Broadcom Wi-Fi/Bluetooth on GPIO? (Baytrail tablet)

[Bastien Nocera]

Heya,

On this tablet, based on a Baytrail SoC, I found reference of this
Broadcom device in the DSDT, and I believe it could be the
Bluetooth/Wi-Fi chipset (this one[1]?):
---8<---
Device (BRC3)
{
    Name (_ADR, One)  // _ADR: Address
    Name (_DEP, Package (0x01)  // _DEP: Dependencies
    {
        GPO2
    })
    Name (_HID, "BCM4321")  // _HID: Hardware ID 
    Name (_CID, "BCM43241")  // _CID: Compatible ID
    Name (GMOD, ResourceTemplate ()
    {
        GpioIo (Exclusive, PullDefault, 0x0000, 0x0000,
IoRestrictionOutputOnly,
            "\\_SB.GPO2", 0x00, ResourceConsumer, ,
            )
            {   // Pin list 
                0x0014
            }
    })
---8<---

Am I correct in thinking that it's a Broadcom chipset? What would it
take to get this supported in the kernel? I'm currently stuck on a
slightly older kernel (3.16.0) due to Intel graphics driver problems,
but I couldn't find anything directly related to this in the current
linus tree.

Cheers

[1]:
http://www.broadcom.com/products/Wireless-LAN/802.11-Wireless-LAN-Solutions/BCM43241

Re: Broadcom Wi-Fi/Bluetooth on GPIO? (Baytrail tablet)

[Rafał Miłecki]

On 5 September 2014 00:39, Bastien Nocera <hadess@hadess.net> wrote:
> On this tablet, based on a Baytrail SoC, I found reference of this
> Broadcom device in the DSDT, and I believe it could be the
> Bluetooth/Wi-Fi chipset (this one[1]?):
> ---8<---
> Device (BRC3)
> {
>     Name (_ADR, One)  // _ADR: Address
>     Name (_DEP, Package (0x01)  // _DEP: Dependencies
>     {
>         GPO2
>     })
>     Name (_HID, "BCM4321")  // _HID: Hardware ID
>     Name (_CID, "BCM43241")  // _CID: Compatible ID
>     Name (GMOD, ResourceTemplate ()
>     {
>         GpioIo (Exclusive, PullDefault, 0x0000, 0x0000,
> IoRestrictionOutputOnly,
>             "\\_SB.GPO2", 0x00, ResourceConsumer, ,
>             )
>             {   // Pin list
>                 0x0014
>             }
>     })
> ---8<---
>
> Am I correct in thinking that it's a Broadcom chipset? What would it
> take to get this supported in the kernel? I'm currently stuck on a
> slightly older kernel (3.16.0) due to Intel graphics driver problems,
> but I couldn't find anything directly related to this in the current
> linus tree.

Most of wireless devices in phones/tables/etc. are full MAC devices.
Broadcom wireless chipset names are a bit tricky. For example chipset
0x4322 can be found in soft MAC devices as well as in full MAC ones.
However in case of Full MAC 0x4322 chipset Broadcom used marketing
name BCM43231.

So I think (it's just a guess) your device is a chipset identifying
itself as 0x4321 in a Full MAC device with marketing name BCM43241.

It seems that brcmfmac already supports BCM43241 as SDIO device. So
unless your tables uses some different (unsupported) chip revision, it
should be just a matter of interface to support your WiFi.

I'm adding brcm80211 ML, they should be able to help a bit more.

[0] http://wireless.kernel.org/en/users/Drivers/brcm80211

-- 
Rafał

Re: Broadcom Wi-Fi/Bluetooth on GPIO? (Baytrail tablet)

[Arend van Spriel]

On 09/05/14 10:06, Rafał Miłecki wrote:
> On 5 September 2014 00:39, Bastien Nocera<hadess@hadess.net>  wrote:
>> On this tablet, based on a Baytrail SoC, I found reference of this
>> Broadcom device in the DSDT, and I believe it could be the
>> Bluetooth/Wi-Fi chipset (this one[1]?):
>> ---8<---
>> Device (BRC3)
>> {
>>      Name (_ADR, One)  // _ADR: Address
>>      Name (_DEP, Package (0x01)  // _DEP: Dependencies
>>      {
>>          GPO2
>>      })
>>      Name (_HID, "BCM4321")  // _HID: Hardware ID
>>      Name (_CID, "BCM43241")  // _CID: Compatible ID
>>      Name (GMOD, ResourceTemplate ()
>>      {
>>          GpioIo (Exclusive, PullDefault, 0x0000, 0x0000,
>> IoRestrictionOutputOnly,
>>              "\\_SB.GPO2", 0x00, ResourceConsumer, ,
>>              )
>>              {   // Pin list
>>                  0x0014
>>              }
>>      })
>> ---8<---
>>
>> Am I correct in thinking that it's a Broadcom chipset? What would it
>> take to get this supported in the kernel? I'm currently stuck on a
>> slightly older kernel (3.16.0) due to Intel graphics driver problems,
>> but I couldn't find anything directly related to this in the current
>> linus tree.
>
> Most of wireless devices in phones/tables/etc. are full MAC devices.
> Broadcom wireless chipset names are a bit tricky. For example chipset
> 0x4322 can be found in soft MAC devices as well as in full MAC ones.
> However in case of Full MAC 0x4322 chipset Broadcom used marketing
> name BCM43231.
>
> So I think (it's just a guess) your device is a chipset identifying
> itself as 0x4321 in a Full MAC device with marketing name BCM43241.
>
> It seems that brcmfmac already supports BCM43241 as SDIO device. So
> unless your tables uses some different (unsupported) chip revision, it
> should be just a matter of interface to support your WiFi.

Correct. I suspect the tablet has 43241. So you can try brcmfmac driver. 
When you load it with 'debug=0x1416' you will probably get more from the 
kernel log regarding the chip revision. You need to have firmware in 
/lib/firmware/brcm. Which one depends on the chip id and/or revision.

Regards,
Arend

Re: Broadcom Wi-Fi/Bluetooth on GPIO? (Baytrail tablet)

[Bastien Nocera]

Hey Rafał, Arend,

On Mon, 2014-09-08 at 11:00 +0200, Arend van Spriel wrote:
> On 09/05/14 10:06, Rafał Miłecki wrote:
> > On 5 September 2014 00:39, Bastien Nocera<hadess@hadess.net>  wrote:
> >> On this tablet, based on a Baytrail SoC, I found reference of this
> >> Broadcom device in the DSDT, and I believe it could be the
> >> Bluetooth/Wi-Fi chipset (this one[1]?):
> >> ---8<---
> >> Device (BRC3)
> >> {
> >>      Name (_ADR, One)  // _ADR: Address
> >>      Name (_DEP, Package (0x01)  // _DEP: Dependencies
> >>      {
> >>          GPO2
> >>      })
> >>      Name (_HID, "BCM4321")  // _HID: Hardware ID
> >>      Name (_CID, "BCM43241")  // _CID: Compatible ID
> >>      Name (GMOD, ResourceTemplate ()
> >>      {
> >>          GpioIo (Exclusive, PullDefault, 0x0000, 0x0000,
> >> IoRestrictionOutputOnly,
> >>              "\\_SB.GPO2", 0x00, ResourceConsumer, ,
> >>              )
> >>              {   // Pin list
> >>                  0x0014
> >>              }
> >>      })
> >> ---8<---
> >>
> >> Am I correct in thinking that it's a Broadcom chipset? What would it
> >> take to get this supported in the kernel? I'm currently stuck on a
> >> slightly older kernel (3.16.0) due to Intel graphics driver problems,
> >> but I couldn't find anything directly related to this in the current
> >> linus tree.
> >
> > Most of wireless devices in phones/tables/etc. are full MAC devices.
> > Broadcom wireless chipset names are a bit tricky. For example chipset
> > 0x4322 can be found in soft MAC devices as well as in full MAC ones.
> > However in case of Full MAC 0x4322 chipset Broadcom used marketing
> > name BCM43231.
> >
> > So I think (it's just a guess) your device is a chipset identifying
> > itself as 0x4321 in a Full MAC device with marketing name BCM43241.
> >
> > It seems that brcmfmac already supports BCM43241 as SDIO device. So
> > unless your tables uses some different (unsupported) chip revision, it
> > should be just a matter of interface to support your WiFi.
> 
> Correct. I suspect the tablet has 43241. So you can try brcmfmac driver. 
> When you load it with 'debug=0x1416' you will probably get more from the 
> kernel log regarding the chip revision. You need to have firmware in 
> /lib/firmware/brcm. Which one depends on the chip id and/or revision.

It turns out that the device, though present in the decompiled ACPI DSDT
isn't actually present on the system. This tablet actually contains a
Realtek device (also present in the DSDT). Apologies for the misdirected
mail.

Cheers