xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

media: cec: add CEC_EVENT_PIN_HPD_LOW/HIGH events

Browse Source 
Add support for two new low-level events: PIN_HPD_LOW and PIN_HPD_HIGH.

This is specifically meant for use with the upcoming cec-gpio driver
and makes it possible to trace when the HPD pin changes. Some HDMI
sinks do strange things with the HPD and this makes it easy to debug
this.

Note that this also moves the initialization of a devnode mutex and
list to the allocate_adapter function: if the HPD is high, then as
soon as the HPD interrupt is created an interrupt occurs and
cec_queue_pin_hpd_event() is called which requires that the devnode
mutex and list are initialized.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil
2017-08-15 10:07:25 -04:00
committed by Mauro Carvalho Chehab
parent da634f623e
commit 333ef6bd10
6 changed files with 52 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/media/cec/cec-api.c
View File

@@ -529,7 +529,7 @@ static int cec_open(struct inode *inode, struct file *filp)
* Initial events that are automatically sent when the cec device is
* opened.
*/
struct cec_event ev_state = {
struct cec_event ev = {
.event = CEC_EVENT_STATE_CHANGE,
.flags = CEC_EVENT_FL_INITIAL_STATE,
};
@@ -569,9 +569,19 @@ static int cec_open(struct inode *inode, struct file *filp)
filp->private_data = fh;
/* Queue up initial state events */
ev_state.state_change.phys_addr = adap->phys_addr;
ev_state.state_change.log_addr_mask = adap->log_addrs.log_addr_mask;
cec_queue_event_fh(fh, &ev_state, 0);
ev.state_change.phys_addr = adap->phys_addr;
ev.state_change.log_addr_mask = adap->log_addrs.log_addr_mask;
cec_queue_event_fh(fh, &ev, 0);
#ifdef CONFIG_CEC_PIN
if (adap->pin && adap->pin->ops->read_hpd) {
err = adap->pin->ops->read_hpd(adap);
if (err >= 0) {
ev.event = err ? CEC_EVENT_PIN_HPD_HIGH :
CEC_EVENT_PIN_HPD_LOW;
cec_queue_event_fh(fh, &ev, 0);
}
}
#endif
list_add(&fh->list, &devnode->fhs);
mutex_unlock(&devnode->lock);