[PATCH v8 10/34] gpu: host1x: Add host1x_channel_stop()
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2021-08-17 01:30:37
Also in:
dri-devel, linux-clk, linux-devicetree, linux-media, linux-mmc, linux-pwm, linux-spi, linux-staging, linux-tegra, linux-usb, lkml
Subsystem:
drm drivers, drm drivers for nvidia tegra, the rest · Maintainers:
David Airlie, Simona Vetter, Thierry Reding, Mikko Perttunen, Linus Torvalds
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 <redacted> # Ouya T30 Tested-by: Paul Fertser <fercerpav@gmail.com> # PAZ00 T20 Tested-by: Nicolas Chauvet <redacted> # PAZ00 T20 and TK1 T124 Tested-by: Matt Merhar <redacted> # 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 7bccf589aba7..66473b5be0af 100644
--- a/include/linux/host1x.h
+++ b/include/linux/host1x.h@@ -181,6 +181,7 @@ 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);
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2.32.0