p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

[media] adv7511: disable register reset by HPD 

Whenever the hotplug pin is pulled low the chip resets a whole bunch
of registers. It turns out that this can be turned off on the adv7511.
Do so, as this 'feature' introduces race conditions in setting up
registers, particular when the hotplug pin bounces a lot.

Signed-off-by: Martin Bugge <marbugge@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Martin Bugge 2013-12-05 09:02:20 -03:00 committed by Mauro Carvalho Chehab
parent a6c98f56e7
commit a62c621670
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/media/i2c/adv7511.c
View File

@ -1038,6 +1038,12 @@ static void adv7511_init_setup(struct v4l2_subdev *sd)
/* clear all interrupts */
adv7511_wr(sd, 0x96, 0xff);
/*
* Stop HPD from resetting a lot of registers.
* It might leave the chip in a partly un-initialized state,
* in particular with regards to hotplug bounces.
*/
adv7511_wr_and_or(sd, 0xd6, 0x3f, 0xc0);
memset(edid, 0, sizeof(struct adv7511_state_edid));
state->have_monitor = false;
adv7511_set_isr(sd, false);