Commit 9ca790f4 authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Thierry Reding
Browse files

gpu: host1x: Add host1x_channel_stop() 



Add host1x_channel_stop() which waits till channel becomes idle and then
stops the channel hardware. This is needed for supporting suspend/resume
by host1x drivers since the hardware state is lost after power-gating,
thus the channel needs to be stopped before client enters into suspend.

Tested-by: Peter Geis <pgwipeout@gmail.com> # Ouya T30
Tested-by: Paul Fertser <fercerpav@gmail.com> # PAZ00 T20
Tested-by: Nicolas Chauvet <kwizart@gmail.com> # PAZ00 T20 and TK1 T124
Tested-by: Matt Merhar <mattmerhar@protonmail.com> # Ouya T30
Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 6b6776e2

drivers/gpu/host1x/channel.c

+8 −0
Original line number Diff line number Diff line
@@ -75,6 +75,14 @@ struct host1x_channel *host1x_channel_get_index(struct host1x *host, 
	return ch;

}



void host1x_channel_stop(struct host1x_channel *channel)

{

	struct host1x *host = dev_get_drvdata(channel->dev->parent);



	host1x_hw_cdma_stop(host, &channel->cdma);

}

EXPORT_SYMBOL(host1x_channel_stop);



static void release_channel(struct kref *kref)

{

	struct host1x_channel *channel =

include/linux/host1x.h

+1 −0
Original line number Diff line number Diff line
@@ -226,6 +226,7 @@ struct host1x_job; 


struct host1x_channel *host1x_channel_request(struct host1x_client *client);

struct host1x_channel *host1x_channel_get(struct host1x_channel *channel);

void host1x_channel_stop(struct host1x_channel *channel);

void host1x_channel_put(struct host1x_channel *channel);

int host1x_job_submit(struct host1x_job *job);