On 03/11/2016 12:02 PM, Mauro Carvalho Chehab wrote:
> For au0828_enable_source() to work, the tuner links should be
> disabled and the tuner/decoder should be cached at au0828 struct.
>
> While here, put dev->decoder cache together with dev->tuner, as
> it makes easier to drop both latter if/when we move the enable
> routines to the V4L2 core.
>
> Fixes: 9822f4173f84 ('[media] au0828: use v4l2_mc_create_media_graph()')
> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Thanks for chasing this down. Looking good. I tested it applying
it to the latest media_tree git with this top commit:
commit 840f5b0572ea9ddaca2bf5540a171013e92c97bd
Author: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Date: Wed Mar 9 19:15:38 2016 -0700
media: au0828 disable tuner to demod link in au0828_media_device_register()
I ran though my basic and mutual exclusion test cases and graphs
look correct at every stage.
Reviewed-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Tested-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
thanks,
-- Shuah
> ---
> drivers/media/usb/au0828/au0828-cards.c | 4 ----
> drivers/media/usb/au0828/au0828-core.c | 42 +++++++++++++++++++++------------
> 2 files changed, 27 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/media/usb/au0828/au0828-cards.c b/drivers/media/usb/au0828/au0828-cards.c
> index ca861aea68a5..6b469e8c4c6e 100644
> --- a/drivers/media/usb/au0828/au0828-cards.c
> +++ b/drivers/media/usb/au0828/au0828-cards.c
> @@ -228,10 +228,6 @@ void au0828_card_analog_fe_setup(struct au0828_dev *dev)
> "au8522", 0x8e >> 1, NULL);
> if (sd == NULL)
> pr_err("analog subdev registration failed\n");
> -#ifdef CONFIG_MEDIA_CONTROLLER
> - if (sd)
> - dev->decoder = &sd->entity;
> -#endif
> }
>
> /* Setup tuners */
> diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
> index 5dc82e8c8670..ecfa18939663 100644
> --- a/drivers/media/usb/au0828/au0828-core.c
> +++ b/drivers/media/usb/au0828/au0828-core.c
> @@ -456,7 +456,8 @@ static int au0828_media_device_register(struct au0828_dev *dev,
> {
> #ifdef CONFIG_MEDIA_CONTROLLER
> int ret;
> - struct media_entity *entity, *demod = NULL, *tuner = NULL;
> + struct media_entity *entity, *demod = NULL;
> + struct media_link *link;
>
> if (!dev->media_dev)
> return 0;
> @@ -482,26 +483,37 @@ static int au0828_media_device_register(struct au0828_dev *dev,
> }
>
> /*
> - * Find tuner and demod to disable the link between
> - * the two to avoid disable step when tuner is requested
> - * by video or audio. Note that this step can't be done
> - * until dvb graph is created during dvb register.
> + * Find tuner, decoder and demod.
> + *
> + * The tuner and decoder should be cached, as they'll be used by
> + * au0828_enable_source.
> + *
> + * It also needs to disable the link between tuner and
> + * decoder/demod, to avoid disable step when tuner is requested
> + * by video or audio. Note that this step can't be done until dvb
> + * graph is created during dvb register.
> */
> media_device_for_each_entity(entity, dev->media_dev) {
> - if (entity->function == MEDIA_ENT_F_DTV_DEMOD)
> + switch (entity->function) {
> + case MEDIA_ENT_F_TUNER:
> + dev->tuner = entity;
> + break;
> + case MEDIA_ENT_F_ATV_DECODER:
> + dev->decoder = entity;
> + break;
> + case MEDIA_ENT_F_DTV_DEMOD:
> demod = entity;
> - else if (entity->function == MEDIA_ENT_F_TUNER)
> - tuner = entity;
> + break;
> + }
> }
> - /* Disable link between tuner and demod */
> - if (tuner && demod) {
> - struct media_link *link;
>
> - list_for_each_entry(link, &demod->links, list) {
> - if (link->sink->entity == demod &&
> - link->source->entity == tuner) {
> + /* Disable link between tuner->demod and/or tuner->decoder */
> + if (dev->tuner) {
> + list_for_each_entry(link, &dev->tuner->links, list) {
> + if (demod && link->sink->entity == demod)
> + media_entity_setup_link(link, 0);
> + if (dev->decoder && link->sink->entity == dev->decoder)
> media_entity_setup_link(link, 0);
> - }
> }
> }
>
>
--
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@xxxxxxxxxxxxxxx | (970) 217-8978
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