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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-24 10:21:51 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-24 10:21:51 -0700 |
commit | ab11ca34eea8fda7a1a9302d86f6ef6108ffd68f (patch) | |
tree | 987ec6c263f3dfa4a7a6f9ce4d5ece47cbc12e29 /drivers/media/media-entity.c | |
parent | f9369910a6225b8d4892c3f20ae740a711cd5ace (diff) | |
parent | 71006fb22b0f5a2045605b3887ee99a0e9adafe4 (diff) | |
download | blackbird-op-linux-ab11ca34eea8fda7a1a9302d86f6ef6108ffd68f.tar.gz blackbird-op-linux-ab11ca34eea8fda7a1a9302d86f6ef6108ffd68f.zip |
Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
Pull media updates from Mauro Carvalho Chehab:
- some V4L2 API updates needed by embedded devices
- DVB API extensions for ATSC-MH delivery system, used in US for mobile
TV
- new tuners for fc0011/0012/0013 and tua9001
- a new dvb driver for af9033/9035
- a new ATSC-MH frontend (lg2160)
- new remote controller keymaps
- Removal of a few legacy webcam driver that got replaced by gspca on
several kernel versions ago
- a new driver for Exynos 4/5 webcams(s5pp fimc-lite)
- a new webcam sensor driver (smiapp)
- a new video input driver for embedded (sta2x1xx)
- several improvements, fixes, cleanups, etc inside the drivers.
Manually fix up conflicts due to err() -> dev_err() conversion in
drivers/staging/media/easycap/easycap_main.c
* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (484 commits)
[media] saa7134-cards: Remove a PCI entry added by mistake
[media] radio-sf16fmi: add support for SF16-FMD
[media] rc-loopback: remove duplicate line
[media] patch for Asus My Cinema PS3-100 (1043:48cd)
[media] au0828: Move the Kconfig knob under V4L_USB_DRIVERS
[media] em28xx: simple comment fix
[media] [resend] radio-sf16fmr2: add PnP support for SF16-FMD2
[media] smiapp: Use v4l2_ctrl_new_int_menu() instead of v4l2_ctrl_new_custom()
[media] smiapp: Add support for 8-bit uncompressed formats
[media] smiapp: Allow generic quirk registers
[media] smiapp: Use non-binning limits if the binning limit is zero
[media] smiapp: Initialise rval in smiapp_read_nvm()
[media] smiapp: Round minimum pre_pll up rather than down in ip_clk_freq check
[media] smiapp: Use 8-bit reads only before identifying the sensor
[media] smiapp: Quirk for sensors that only do 8-bit reads
[media] smiapp: Pass struct sensor to register writing commands instead of i2c_client
[media] smiapp: Allow using external clock from the clock framework
[media] zl10353: change .read_snr() to report SNR as a 0.1 dB
[media] media: add support to gspca/pac7302.c for 093a:2627 (Genius FaceCam 300)
[media] m88rs2000 - only flip bit 2 on reg 0x70 on 16th try
...
Diffstat (limited to 'drivers/media/media-entity.c')
-rw-r--r-- | drivers/media/media-entity.c | 57 |
1 files changed, 55 insertions, 2 deletions
diff --git a/drivers/media/media-entity.c b/drivers/media/media-entity.c index 056138f63c7d..e1cd13283407 100644 --- a/drivers/media/media-entity.c +++ b/drivers/media/media-entity.c @@ -214,23 +214,76 @@ EXPORT_SYMBOL_GPL(media_entity_graph_walk_next); * pipeline pointer must be identical for all nested calls to * media_entity_pipeline_start(). */ -void media_entity_pipeline_start(struct media_entity *entity, - struct media_pipeline *pipe) +__must_check int media_entity_pipeline_start(struct media_entity *entity, + struct media_pipeline *pipe) { struct media_device *mdev = entity->parent; struct media_entity_graph graph; + struct media_entity *entity_err = entity; + int ret; mutex_lock(&mdev->graph_mutex); media_entity_graph_walk_start(&graph, entity); while ((entity = media_entity_graph_walk_next(&graph))) { + unsigned int i; + entity->stream_count++; WARN_ON(entity->pipe && entity->pipe != pipe); entity->pipe = pipe; + + /* Already streaming --- no need to check. */ + if (entity->stream_count > 1) + continue; + + if (!entity->ops || !entity->ops->link_validate) + continue; + + for (i = 0; i < entity->num_links; i++) { + struct media_link *link = &entity->links[i]; + + /* Is this pad part of an enabled link? */ + if (!(link->flags & MEDIA_LNK_FL_ENABLED)) + continue; + + /* Are we the sink or not? */ + if (link->sink->entity != entity) + continue; + + ret = entity->ops->link_validate(link); + if (ret < 0 && ret != -ENOIOCTLCMD) + goto error; + } } mutex_unlock(&mdev->graph_mutex); + + return 0; + +error: + /* + * Link validation on graph failed. We revert what we did and + * return the error. + */ + media_entity_graph_walk_start(&graph, entity_err); + + while ((entity_err = media_entity_graph_walk_next(&graph))) { + entity_err->stream_count--; + if (entity_err->stream_count == 0) + entity_err->pipe = NULL; + + /* + * We haven't increased stream_count further than this + * so we quit here. + */ + if (entity_err == entity) + break; + } + + mutex_unlock(&mdev->graph_mutex); + + return ret; } EXPORT_SYMBOL_GPL(media_entity_pipeline_start); |