linux/drivers/media
Mauro Carvalho Chehab 1b3fd2d342 [media] em28xx-audio: don't hardcode audio URB calculus
The current code hardcodes the number of audio URBs, the number
of packets per URB and the maximum URB size.

This is not a good idea, as it:

- wastes more bandwidth than necessary, by using a very
  large number of packets;

- those constants are bound to an specific scenario, with
  a bandwidth of 48 kHz;

- don't take the maximum endpoint size into account;

- with urb->interval = 1 on xHCI, those constraints cause a "funny"
  setup: URBs with 64 packets inside, with only 24 bytes total. E. g.
  a complete waste of space.

Change the code to do dynamic URB audio calculus and allocation.

For now, use the same constraints as used before this patch, to
avoid regressions.

A good scenario (tested) seems to use those defines, instead:

	#define EM28XX_MAX_AUDIO_BUFS          8
	#define EM28XX_MIN_AUDIO_PACKETS       2

But let's not do such change here, letting the optimization to
happen on latter patches, after more tests.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
2014-01-12 11:56:59 -02:00
..
common [media] media_tree: Fix spelling errors 2013-12-09 14:50:50 -02:00
dvb-core [media] Add USB IDs for Winfast DTV Dongle Mini-D 2013-12-19 09:26:15 -02:00
dvb-frontends [media] m88rs2000: Correct m88rs2000_get_fec 2014-01-07 09:40:34 -02:00
firewire firewire: introduce fw_driver.probe and .remove methods 2013-06-09 18:15:00 +02:00
i2c [media] s5k5baf: Fix potential NULL pointer dereferencing 2014-01-07 08:48:46 -02:00
mmc [media] siano: get rid of CammelCase from smscoreapi.h 2013-03-21 10:03:16 -03:00
parport [media] bw-qcam: fix timestamp handling 2013-05-27 09:30:19 -03:00
pci [media] videodev2: Set vb2_rect's width and height as unsigned 2014-01-07 08:02:39 -02:00
platform [media] media: soc_camera: rcar_vin: Add preliminary R-Car M2 support 2014-01-07 08:12:57 -02:00
radio [media] radio-raremono: add support for 'Thanko's Raremono' AM/FM/SW USB device 2013-12-18 11:30:32 -02:00
rc [media] media: Remove OOM message after input_allocate_device 2014-01-07 08:01:42 -02:00
tuners [media] tuner-xc2028: Don't read status if device is powered down 2014-01-10 06:05:13 -02:00
usb [media] em28xx-audio: don't hardcode audio URB calculus 2014-01-12 11:56:59 -02:00
v4l2-core [media] vb2: Fix comment in __qbuf_dmabuf 2014-01-07 09:46:29 -02:00
Kconfig [media] subdev autoselect only works if I2C and I2C_MUX is selected 2013-12-21 06:03:06 -02:00
Makefile [media] move i2c files into drivers/media/i2c 2012-09-06 18:42:54 -03:00
media-device.c [media] media: info leak in __media_device_enum_links() 2013-06-12 18:52:45 -03:00
media-devnode.c [media] media: Add 64--32 bit compat ioctl handler 2013-03-18 20:44:36 -03:00
media-entity.c [media] media: Check for active links on pads with MEDIA_PAD_FL_MUST_CONNECT flag 2013-12-04 15:03:45 -02:00