Re: brcmfmac NVRAM files

[Arend van Spriel <arend@broadcom.com>]

On 03/05/2014 05:50 PM, Samuel Ortiz wrote:
> On Wed, Mar 05, 2014 at 05:15:27PM +0100, Arend van Spriel wrote:
>> On 03/05/14 11:24, Samuel Ortiz wrote:
>>> I'm attaching the log corresponding to a modprobe brcmfmac debug=0x31416
>>> &&  ifconfig wlan0 up sequence.
>>> I have modified this in the driver, to make it less aggressive about
>>> SDIO sleeps:
>>>
>>> sdio_host.h:
>>> #define BRCMF_WD_POLL_MS        200
>>>
>>> dhd_sdio.c:
>>> #define BRCMF_IDLE_INTERVAL     20
>>
>> So this log looks fine, because due to the changes above it never
>> goes to sleep. The log actually show it is a backport, right?
> That's correct, yes.
> 
>  
>>>>>  I also have 2 question for you;-)
>>> Sorry if I sounded a bit rude, I didn't mean it :-/
>>
>> I did not take it as rude so no worries.
>>
>>>>>  - what mmc host controller is used?
>>> So this is sdhci-acpi.
>>>
>>>>>  - do you have CONFIG_RUNTIME_PM enabled?
>>> CONFIG_PM_RUNTIME is enabled, yes. Do you want me to test with it
>>> disabled ?
>>>
>>
>> I am asking because Russell King recently discovered that SDHCI
>> based host controller drivers disable the SDIO interrupt.
> You mean they do so from their runtime_suspend hook ?
> I see the thread now:
> 
> http://www.spinics.net/lists/arm-kernel/msg308757.html
> 
> It seems those patches have not been reviewed nor merged...
> I'll watch that thread closely ;)
> 
>> This would
>> explain the timeout on the scan as the scan results are events from
>> the device that require this interrupt. Even with your patches this
>> may still happen. You can probably disable it for the host
>> controller through sysfs.
> I did so, and things seem to be more stable. The throughput is a lot
> better. Better is expected but 20x better is something else.
> I still get fairly weak signal, typically -75 dBm for APs that are a few
> meters away. Does that sound like reasonable values to you ?

Depending on the definition of a few meters and whether there is a
concrete wall in between, I tend to say -75 dBm is crap. Up to 10 meters
(without aforementioned wall) I would expect something around -40 dBm.

Regards,
Arend