Jean-Francois Moine wrote: > On Sun, 10 Jan 2010 17:58:58 +0100 > Németh Márton <nm127@xxxxxxxxxxx> wrote: > >> Then I plugged and unplugged the device 16 times. When I last plugged >> the device I get the following error in the dmesg: >> >> [32393.421313] gspca: probing 093a:2626 >> [32393.426193] gspca: video0 created >> [32393.426958] gspca: probing 093a:2626 >> [32393.426968] gspca: Interface class 1 not handled here >> [32394.005917] pac7302: reg_w_page(): Failed to write register to >> index 0x49, value 0x0, error -71 >> [32394.067799] gspca: set alt 8 err -71 >> [32394.090792] gspca: set alt 8 err -71 >> [32394.118159] gspca: set alt 8 err -71 >> >> The 17th plug was working correctly again. I executed this test on an >> EeePC 901. >> >> This driver version contains the msleep(4) in the reg_w_buf(). >> However, here the reg_w_page() fails, which does not have msleep() >> inside. I don't know what is the real problem, but I am afraid that >> slowing down reg_w_page() would make the time longer when the device >> can be used starting from the event when it is plugged. > > Hi again, > > I don't understand what you mean by: >> This driver version contains the msleep(4) in the reg_w_buf(). >> However, here the reg_w_page() fails, which does not have msleep() >> inside. I tought that the msleep(4) call introduced recently fixed the plug-in problem. It seems I misunderstood something. > Indeed the delay will slow down the webcam start (256 * 4 ms = 1s). > > If having a delay fixes the problem, then, as the error always occurs > at the same index 0x49 (3 reports), a single delay could be set before > writing to this index. Do you want I code this for test? I tested the behaviour a little bit more. Out of 100 plug-ins: OK: 81 times "pac7302: reg_w_page(): Failed to write register to index 0x49, value 0x0, error -71": 19 times Other error message I haven't got, so 19% of the time writing to register index 0x49 fails in reg_w_page(). So let's try doing fixing the way you described. If you send me a patch I can test it. Regards, Márton Németh -- 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
