[PATCH] b43: ensure ext PA lines are enabled for BCM4331

[Hauke Mehrtens]

On 05/31/2012 03:49 PM, Seth Forshee wrote:
> Some MacBook Pro models with BCM4331 wireless will stop transmitting
> after resuming from S3 without external power attached. This is fixed by
> ensuring that the ext PA lines are enabled in BCMA_CC_CHIPCTL. Export
> the function in bcma which does this for use by b43 and enable the ext
> PA lines during wireless core initialization.
> 
> BugLink: http://bugs.launchpad.net/bugs/925577
> Cc: Arend van Spriel <arend at broadcom.com>
> Cc: stable at vger.kernel.org
> Signed-off-by: Seth Forshee <seth.forshee at canonical.com>
> ---
>  drivers/bcma/driver_chipcommon_pmu.c |    1 +
>  drivers/net/wireless/b43/main.c      |    7 +++++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/bcma/driver_chipcommon_pmu.c b/drivers/bcma/driver_chipcommon_pmu.c
> index a058842..332d7fb 100644
> --- a/drivers/bcma/driver_chipcommon_pmu.c
> +++ b/drivers/bcma/driver_chipcommon_pmu.c
> @@ -129,6 +129,7 @@ void bcma_chipco_bcm4331_ext_pa_lines_ctl(struct bcma_drv_cc *cc, bool enable)
>  	}
>  	bcma_cc_write32(cc, BCMA_CC_CHIPCTL, val);
>  }
> +EXPORT_SYMBOL_GPL(bcma_chipco_bcm4331_ext_pa_lines_ctl);
>  
>  void bcma_pmu_workarounds(struct bcma_drv_cc *cc)
>  {
> diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
> index 5a39b22..6bac5cf 100644
> --- a/drivers/net/wireless/b43/main.c
> +++ b/drivers/net/wireless/b43/main.c
> @@ -4713,6 +4713,13 @@ static int b43_wireless_core_init(struct b43_wldev *dev)
>  	b43_upload_card_macaddress(dev);
>  	b43_security_init(dev);
>  
> +#ifdef CONFIG_B43_BCMA
> +	/* Required for tx to work on BCM4331 */
> +	if (dev->dev->bus_type == B43_BUS_BCMA && dev->dev->chip_id == 0x4331)
> +		bcma_chipco_bcm4331_ext_pa_lines_ctl(&dev->dev->bdev->bus->drv_cc,
> +						     true);
> +#endif
> +
>  	ieee80211_wake_queues(dev->wl->hw);
>  
>  	b43_set_status(dev, B43_STAT_INITIALIZED);

Hi Seth,

why don't you call this from bcma_pmu_workarounds() in
drivers/bcma/driver_chipcommon_pmu.c instead of calling this from b43? I
think it looks better to call some workarounds on chip common from bcma
and not from b43.
According to some Broadcom code this should also be called for chip_id
43431 when turning it on and in the sprom code.

Hauke