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    Subject[PATCH v15 09/39] gpu: host1x: Add host1x_channel_stop()
    Date
    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>
    ---
    drivers/gpu/host1x/channel.c | 8 ++++++++
    include/linux/host1x.h | 1 +
    2 files changed, 9 insertions(+)

    diff --git a/drivers/gpu/host1x/channel.c b/drivers/gpu/host1x/channel.c
    index 4cd212bb570d..2a9a3a8d5931 100644
    --- a/drivers/gpu/host1x/channel.c
    +++ b/drivers/gpu/host1x/channel.c
    @@ -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 =
    diff --git a/include/linux/host1x.h b/include/linux/host1x.h
    index 2ca53d7ed7ca..e8dc5bc41f79 100644
    --- a/include/linux/host1x.h
    +++ b/include/linux/host1x.h
    @@ -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);

    --
    2.33.1
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