Stephane,
USB Host driver very well supports use case scenarios were in we
have a Wifi device and MSC sticks operating simultaneously.
There are no hardware limitations as I know of that limits the above use case
scenario.
Regards
Swami
PSP downloads at :
http://software.ti.com/swcoe/intranet/reports/pds/PSP_releases.php
Office : +91-80-25048629
________________________________
From: Stephane Cerveau [mailto:[EMAIL PROTECTED]
Sent: Friday, November 14, 2008 11:39 AM
To: Subbrathnam, Swaminathan; [email protected]
Cc: John Whittington; Mike Eberhardt; Raymond Picard
Subject: RE: WIFI againt DMA mode in USB host driver
Hi,
I'm using a Davinci DM6446 board with a RT73 Bulk USB WIFI dongle and a
regular USB MSC key. Digging the WIFI code and the USB host code, I figured out
that using both WIFI connection and MSC operation causes some troubles against
the scheduling of the packets. Obviously with Bulk device and specifically
Network USB device, the USB host stack can get stucked into the wait of answer
from the host device . Indeed it seems that the USB host driver in DMA mode is
not designed actually to support this kind of schedule.
Can you first confirm this ?
In a second time do you know if TI's team has planned to support this kind of
behaviour? And at last do you know if there is some hardware limitations?
Thank you very much for your answer.
Stéphane Cerveau.
From: Subbrathnam, Swaminathan [mailto:[EMAIL PROTECTED]
Sent: jeudi 13 novembre 2008 09:02
To: Stephane Cerveau
Subject: RE: WIFI againt DMA mode in USB host driver
Stephane,
I assume you have a HUB, Wifi Device, MSC media connected to DM355 USB port in
your system.
WiFi traffic will no way affect the MSC media traffic and I am surprised to see
the low throughput numbers you are reporting.
Let me set up the environment at my end and measure the performance on DM355
with MSC media.
Regards
Swami
PSP downloads at :
http://software.ti.com/swcoe/intranet/reports/pds/PSP_releases.php
Office : +91-80-25048629
________________________________
From: Stephane Cerveau [mailto:[EMAIL PROTECTED]
Sent: Thursday, November 13, 2008 11:26 AM
To: Subbrathnam, Swaminathan
Subject: RE: WIFI againt DMA mode in USB host driver
It's not exactly a crash but the USB stack in DMA mode on 2.6.27 driver can
wegde when a device such as a bulk device WIFI dongle is connected and used.
My use case is downloading a media on a USB mass storage device with a WIFI USB
dongle on a hub.
We have in this case very poor performance(less than 1MB) for the USB Mass
storage device because the WIFI device sometimes takes time to answer(NAK USB
message for a while).
Is it previewed by TI that the USB stack should schedule the other devices if
one is pending?
Best regards.
Stéphane
From: Subbrathnam, Swaminathan [mailto:[EMAIL PROTECTED]
Sent: mardi 11 novembre 2008 14:04
To: Stephane Cerveau; [email protected]
Subject: RE: WIFI againt DMA mode in USB host driver
Can you forward the crash log ?
Regards
Swami
PSP downloads at :
http://software.ti.com/swcoe/intranet/reports/pds/PSP_releases.php
Office : +91-80-25048629
________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Stephane Cerveau
Sent: Friday, November 07, 2008 7:34 AM
To: [email protected]
Subject: RE: WIFI againt DMA mode in USB host driver
Hi,
I'm currently using a WIFI key on DaVinci but I'm experiencing crash and lock
in the DaVinci USB driver in DMA mode.
Is there anybody who experienced this kind of problem and can help me using
WIFI dongle ?
I'm using the July latest patch from TI integrated.
Cheers.
_______________________________________________
Davinci-linux-open-source mailing list
[email protected]
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
