On Wed, 2011-01-19 at 13:40 +0100, Jean Delvare wrote: > On Wed, 19 Jan 2011 07:21:58 -0500, Andy Walls wrote: > > For debugging, you might want to hack in a probe of address 0x70 for > > your HVR-1950, to ensure the Tx side responds in the bridge driver. > > ... keeping in mind that the Z8 doesn't seem to like quick writes, so > short reads should be used for probing purpose. > Noted. Thanks. Actually, I think that might be due to the controller in the USB connected devices (hdpvr and pvrusb2). The PCI connected devices, like cx18 cards, don't have a problem with the Z8, the default I2C probe method, and i2c-algo-bit. (A good example of why only bridge drivers should do any required probing.) Looking at the code in pvrusb2, it appears to already use a 0 length read for a probe: http://git.linuxtv.org/media_tree.git?a=blob;f=drivers/media/video/pvrusb2/pvrusb2-i2c-core.c;h=ccc884948f34b385563ccbf548c5f80b33cd4f08;hb=refs/heads/staging/for_2.6.38-rc1#l542 Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
