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 <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 <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.
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