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gpu: host1x: Add host1x_channel_stop()

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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: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2021-12-01 02:23:16 +03:00 committed by Thierry Reding
parent 6b6776e2ab
commit 9ca790f446
2 changed files with 9 additions and 0 deletions
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8
drivers/gpu/host1x/channel.c
View File

@ -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 =

1
include/linux/host1x.h
View File

@ -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);