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Message-ID: <56B3671B.4000706@osg.samsung.com>
Date: Thu, 4 Feb 2016 07:58:35 -0700
From: Shuah Khan <shuahkh@....samsung.com>
To: Mauro Carvalho Chehab <mchehab@....samsung.com>
Cc: tiwai@...e.com, clemens@...isch.de, hans.verkuil@...co.com,
laurent.pinchart@...asonboard.com, sakari.ailus@...ux.intel.com,
javier@....samsung.com, pawel@...iak.com, m.szyprowski@...sung.com,
kyungmin.park@...sung.com, perex@...ex.cz, arnd@...db.de,
dan.carpenter@...cle.com, tvboxspy@...il.com, crope@....fi,
ruchandani.tina@...il.com, corbet@....net, chehabrafael@...il.com,
k.kozlowski@...sung.com, stefanr@...6.in-berlin.de,
inki.dae@...sung.com, jh1009.sung@...sung.com,
elfring@...rs.sourceforge.net, prabhakar.csengg@...il.com,
sw0312.kim@...sung.com, p.zabel@...gutronix.de,
ricardo.ribalda@...il.com, labbott@...oraproject.org,
pierre-louis.bossart@...ux.intel.com, ricard.wanderlof@...s.com,
julian@...st.de, takamichiho@...il.com, dominic.sacre@....de,
misterpib@...il.com, daniel@...que.org, gtmkramer@...all.nl,
normalperson@...t.net, joe@...po.co.uk, linuxbugs@...tgam.net,
johan@...ud.se, klock.android@...il.com, nenggun.kim@...sung.com,
j.anaszewski@...sung.com, geliangtang@....com,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
alsa-devel@...a-project.org, Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH v2 11/22] media: dvb-frontend invoke enable/disable_source
handlers
On 02/04/2016 02:35 AM, Mauro Carvalho Chehab wrote:
> Em Wed, 03 Feb 2016 21:03:43 -0700
> Shuah Khan <shuahkh@....samsung.com> escreveu:
>
>> Change dvb frontend to check if tuner is free when
>> device opened in RW mode. Call to enable_source
>> handler either returns with an active pipeline to
>> tuner or error if tuner is busy. Tuner is released
>> when frontend is released calling the disable_source
>> handler.
>
> This patch seems too early in the series, as I'm not seeing any patch
> providing a replacement for the removed code yet.
Removed linux-api from cc:
Yes you are right - I will move this after au0828 patch
that adds the handler.
>
>>
>> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
>> ---
>> drivers/media/dvb-core/dvb_frontend.c | 139 +++++-----------------------------
>> drivers/media/dvb-core/dvb_frontend.h | 3 +
>> 2 files changed, 24 insertions(+), 118 deletions(-)
>>
>> diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
>> index 03cc508..2b17e8b 100644
>> --- a/drivers/media/dvb-core/dvb_frontend.c
>> +++ b/drivers/media/dvb-core/dvb_frontend.c
>> @@ -131,11 +131,6 @@ struct dvb_frontend_private {
>> int quality;
>> unsigned int check_wrapped;
>> enum dvbfe_search algo_status;
>> -
>> -#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
>> - struct media_pipeline pipe;
>> - struct media_entity *pipe_start_entity;
>> -#endif
>> };
>>
>> static void dvb_frontend_wakeup(struct dvb_frontend *fe);
>> @@ -596,104 +591,12 @@ static void dvb_frontend_wakeup(struct dvb_frontend *fe)
>> wake_up_interruptible(&fepriv->wait_queue);
>> }
>>
>> -/**
>> - * dvb_enable_media_tuner() - tries to enable the DVB tuner
>> - *
>> - * @fe: struct dvb_frontend pointer
>> - *
>> - * This function ensures that just one media tuner is enabled for a given
>> - * frontend. It has two different behaviors:
>> - * - For trivial devices with just one tuner:
>> - * it just enables the existing tuner->fe link
>> - * - For devices with more than one tuner:
>> - * It is up to the driver to implement the logic that will enable one tuner
>> - * and disable the other ones. However, if more than one tuner is enabled for
>> - * the same frontend, it will print an error message and return -EINVAL.
>> - *
>> - * At return, it will return the error code returned by media_entity_setup_link,
>> - * or 0 if everything is OK, if no tuner is linked to the frontend or if the
>> - * mdev is NULL.
>> - */
>> -#ifdef CONFIG_MEDIA_CONTROLLER_DVB
>> -static int dvb_enable_media_tuner(struct dvb_frontend *fe)
>> -{
>> - struct dvb_frontend_private *fepriv = fe->frontend_priv;
>> - struct dvb_adapter *adapter = fe->dvb;
>> - struct media_device *mdev = adapter->mdev;
>> - struct media_entity *entity, *source;
>> - struct media_link *link, *found_link = NULL;
>> - int ret, n_links = 0, active_links = 0;
>> -
>> - fepriv->pipe_start_entity = NULL;
>> -
>> - if (!mdev)
>> - return 0;
>> -
>> - entity = fepriv->dvbdev->entity;
>> - fepriv->pipe_start_entity = entity;
>> -
>> - list_for_each_entry(link, &entity->links, list) {
>> - if (link->sink->entity == entity) {
>> - found_link = link;
>> - n_links++;
>> - if (link->flags & MEDIA_LNK_FL_ENABLED)
>> - active_links++;
>> - }
>> - }
>> -
>> - if (!n_links || active_links == 1 || !found_link)
>> - return 0;
>> -
>> - /*
>> - * If a frontend has more than one tuner linked, it is up to the driver
>> - * to select with one will be the active one, as the frontend core can't
>> - * guess. If the driver doesn't do that, it is a bug.
>> - */
>> - if (n_links > 1 && active_links != 1) {
>> - dev_err(fe->dvb->device,
>> - "WARNING: there are %d active links among %d tuners. This is a driver's bug!\n",
>> - active_links, n_links);
>> - return -EINVAL;
>> - }
>> -
>> - source = found_link->source->entity;
>> - fepriv->pipe_start_entity = source;
>> - list_for_each_entry(link, &source->links, list) {
>> - struct media_entity *sink;
>> - int flags = 0;
>> -
>> - sink = link->sink->entity;
>> - if (sink == entity)
>> - flags = MEDIA_LNK_FL_ENABLED;
>> -
>> - ret = media_entity_setup_link(link, flags);
>> - if (ret) {
>> - dev_err(fe->dvb->device,
>> - "Couldn't change link %s->%s to %s. Error %d\n",
>> - source->name, sink->name,
>> - flags ? "enabled" : "disabled",
>> - ret);
>> - return ret;
>> - } else
>> - dev_dbg(fe->dvb->device,
>> - "link %s->%s was %s\n",
>> - source->name, sink->name,
>> - flags ? "ENABLED" : "disabled");
>> - }
>> - return 0;
>> -}
>> -#endif
>> -
>> static int dvb_frontend_thread(void *data)
>> {
>> struct dvb_frontend *fe = data;
>> struct dvb_frontend_private *fepriv = fe->frontend_priv;
>> enum fe_status s;
>> enum dvbfe_algo algo;
>> -#ifdef CONFIG_MEDIA_CONTROLLER_DVB
>> - int ret;
>> -#endif
>> -
>> bool re_tune = false;
>> bool semheld = false;
>>
>> @@ -706,20 +609,6 @@ static int dvb_frontend_thread(void *data)
>> fepriv->wakeup = 0;
>> fepriv->reinitialise = 0;
>>
>> -#ifdef CONFIG_MEDIA_CONTROLLER_DVB
>> - ret = dvb_enable_media_tuner(fe);
>> - if (ret) {
>> - /* FIXME: return an error if it fails */
>> - dev_info(fe->dvb->device,
>> - "proceeding with FE task\n");
>> - } else if (fepriv->pipe_start_entity) {
>> - ret = media_entity_pipeline_start(fepriv->pipe_start_entity,
>> - &fepriv->pipe);
>> - if (ret)
>> - return ret;
>> - }
>> -#endif
>> -
>> dvb_frontend_init(fe);
>>
>> set_freezable();
>> @@ -829,12 +718,6 @@ restart:
>> }
>> }
>>
>> -#ifdef CONFIG_MEDIA_CONTROLLER_DVB
>> - if (fepriv->pipe_start_entity)
>> - media_entity_pipeline_stop(fepriv->pipe_start_entity);
>> - fepriv->pipe_start_entity = NULL;
>> -#endif
>> -
>> if (dvb_powerdown_on_sleep) {
>> if (fe->ops.set_voltage)
>> fe->ops.set_voltage(fe, SEC_VOLTAGE_OFF);
>> @@ -2612,9 +2495,20 @@ static int dvb_frontend_open(struct inode *inode, struct file *file)
>> fepriv->tone = -1;
>> fepriv->voltage = -1;
>>
>> +#ifdef CONFIG_MEDIA_CONTROLLER_DVB
>> + if (fe->dvb->mdev && fe->dvb->mdev->enable_source) {
>> + ret = fe->dvb->mdev->enable_source(dvbdev->entity,
>> + &fe->pipe);
>> + if (ret) {
>> + dev_err(fe->dvb->device,
>> + "Tuner is busy. Error %d\n", ret);
>> + goto err2;
>> + }
>> + }
>> +#endif
>> ret = dvb_frontend_start (fe);
>> if (ret)
>> - goto err2;
>> + goto err3;
>>
>> /* empty event queue */
>> fepriv->events.eventr = fepriv->events.eventw = 0;
>> @@ -2624,7 +2518,12 @@ static int dvb_frontend_open(struct inode *inode, struct file *file)
>> mutex_unlock (&adapter->mfe_lock);
>> return ret;
>>
>> +err3:
>> +#ifdef CONFIG_MEDIA_CONTROLLER_DVB
>> + if (fe->dvb->mdev && fe->dvb->mdev->disable_source)
>> + fe->dvb->mdev->disable_source(dvbdev->entity);
>> err2:
>> +#endif
>> dvb_generic_release(inode, file);
>> err1:
>> if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
>> @@ -2653,6 +2552,10 @@ static int dvb_frontend_release(struct inode *inode, struct file *file)
>>
>> if (dvbdev->users == -1) {
>> wake_up(&fepriv->wait_queue);
>> +#ifdef CONFIG_MEDIA_CONTROLLER_DVB
>> + if (fe->dvb->mdev && fe->dvb->mdev->disable_source)
>> + fe->dvb->mdev->disable_source(dvbdev->entity);
>> +#endif
>> if (fe->exit != DVB_FE_NO_EXIT)
>> wake_up(&dvbdev->wait_queue);
>> if (fe->ops.ts_bus_ctrl)
>> diff --git a/drivers/media/dvb-core/dvb_frontend.h b/drivers/media/dvb-core/dvb_frontend.h
>> index 458bcce..9466906 100644
>> --- a/drivers/media/dvb-core/dvb_frontend.h
>> +++ b/drivers/media/dvb-core/dvb_frontend.h
>> @@ -686,6 +686,9 @@ struct dvb_frontend {
>> int (*callback)(void *adapter_priv, int component, int cmd, int arg);
>> int id;
>> unsigned int exit;
>> +#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
>> + struct media_pipeline pipe;
>> +#endif
>
> Why moving this to the non-private part of the data?
>
There was a reason for this move and I don't recall
at the moment. It has been several months since I
had to rework. I will make sure this change is
necessary and include it in the changelog.
thanks,
-- Shuah
--
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@....samsung.com | (970) 217-8978
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