On Sunday 05 February 2012 14:17:05 Hans Verkuil wrote: > These patches improve the tea575x-tuner module to make it up to date with > the latest V4L2 frameworks. > > The maxiradio driver has also been converted to use the tea575x-tuner and > I've used that card to test it. > > Unfortunately, this card can't read the data pin, so the new hardware seek > functionality has been tested only partially (yes, it seeks, but when it > finds a channel I can't read back the frequency). > > Ondrej, are you able to test these patches for the sound cards that use > this tea575x tuner? > > Note that these two patches rely on other work that I did and that hasn't > been merged yet. So it is best to pull from my git tree: > > http://git.linuxtv.org/hverkuil/media_tree.git/shortlog/refs/heads/radio-pc >i2 > > You can use the v4l-utils repository (http://git.linuxtv.org/v4l-utils.git) > to test the drivers: the v4l2-compliance test should succeed and with > v4l2-ctl you can test the hardware seek: > > To seek down: > > v4l2-ctl -d /dev/radio0 --freq-seek=dir=0 > > To seek up: > > v4l2-ctl -d /dev/radio0 --freq-seek=dir=1 > > To do the compliance test: > > v4l2-compliance -r /dev/radio0 It seems to work (tested with SF64-PCR - snd_fm801) but the seek is severely broken. Reading the frequency immediately after seek does not work, it always returns the old value (haven't found a delay that works). Reading it later (copied back snd_tea575x_get_freq function) works. The chip seeks randomly up or down, ignoring UP/DOWN flag and often stops at wrong place (only noise) or even outside the FM range. So I strongly suggest not to enable this (mis-)feature. The HW seems to be completely broken (unless there's some weird bug in the code). -- Ondrej Zary -- 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
