Commit a62c6216 authored Dec 05, 2013 by Martin Bugge Committed by Mauro Carvalho Chehab Jan 07, 2014

[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>

parent a6c98f56

drivers/media/i2c/adv7511.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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);