[RFC PATCH v2 15/17] drm/tegra: Add power_on/power_off engine callbacks

[Mikko Perttunen]

With the new UAPI implementation, engines are powered on and off
when there are active jobs, and the core code handles channel
allocation. To accommodate that, add the power_on and power_off
callbacks. The open_channel and close_channel callbacks are now only
used for the staging path.

Signed-off-by: Mikko Perttunen <mperttunen at nvidia.com>
---
 drivers/gpu/drm/tegra/drm.h |  11 +++-
 drivers/gpu/drm/tegra/vic.c | 127 ++++++++++++++++++++----------------
 2 files changed, 78 insertions(+), 60 deletions(-)

diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index b25443255be6..b915a3946ad4 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -67,14 +67,19 @@ struct tegra_drm_context {
 };
 
 struct tegra_drm_client_ops {
-	int (*open_channel)(struct tegra_drm_client *client,
-			    struct tegra_drm_context *context);
-	void (*close_channel)(struct tegra_drm_context *context);
+	int (*power_on)(struct tegra_drm_client *client);
+	void (*power_off)(struct tegra_drm_client *client);
+
 	int (*is_addr_reg)(struct device *dev, u32 class, u32 offset);
 	int (*is_valid_class)(u32 class);
 	int (*submit)(struct tegra_drm_context *context,
 		      struct drm_tegra_submit *args, struct drm_device *drm,
 		      struct drm_file *file);
+
+	/* Legacy UAPI callbacks */
+	int (*open_channel)(struct tegra_drm_client *client,
+			    struct tegra_drm_context *context);
+	void (*close_channel)(struct tegra_drm_context *context);
 };
 
 int tegra_drm_submit(struct tegra_drm_context *context,
diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c
index cb476da59adc..4783c7254de9 100644
--- a/drivers/gpu/drm/tegra/vic.c
+++ b/drivers/gpu/drm/tegra/vic.c
@@ -52,48 +52,6 @@ static void vic_writel(struct vic *vic, u32 value, unsigned int offset)
 	writel(value, vic->regs + offset);
 }
 
-static int vic_runtime_resume(struct device *dev)
-{
-	struct vic *vic = dev_get_drvdata(dev);
-	int err;
-
-	err = clk_prepare_enable(vic->clk);
-	if (err < 0)
-		return err;
-
-	usleep_range(10, 20);
-
-	err = reset_control_deassert(vic->rst);
-	if (err < 0)
-		goto disable;
-
-	usleep_range(10, 20);
-
-	return 0;
-
-disable:
-	clk_disable_unprepare(vic->clk);
-	return err;
-}
-
-static int vic_runtime_suspend(struct device *dev)
-{
-	struct vic *vic = dev_get_drvdata(dev);
-	int err;
-
-	err = reset_control_assert(vic->rst);
-	if (err < 0)
-		return err;
-
-	usleep_range(2000, 4000);
-
-	clk_disable_unprepare(vic->clk);
-
-	vic->booted = false;
-
-	return 0;
-}
-
 static int vic_boot(struct vic *vic)
 {
 #ifdef CONFIG_IOMMU_API
@@ -308,47 +266,102 @@ static int vic_load_firmware(struct vic *vic)
 	return err;
 }
 
-static int vic_open_channel(struct tegra_drm_client *client,
-			    struct tegra_drm_context *context)
+
+static int vic_runtime_resume(struct device *dev)
 {
-	struct vic *vic = to_vic(client);
+	struct vic *vic = dev_get_drvdata(dev);
 	int err;
 
-	err = pm_runtime_get_sync(vic->dev);
+	err = clk_prepare_enable(vic->clk);
 	if (err < 0)
 		return err;
 
+	usleep_range(10, 20);
+
+	err = reset_control_deassert(vic->rst);
+	if (err < 0)
+		goto disable;
+
+	usleep_range(10, 20);
+
 	err = vic_load_firmware(vic);
 	if (err < 0)
-		goto rpm_put;
+		goto assert;
 
 	err = vic_boot(vic);
 	if (err < 0)
-		goto rpm_put;
+		goto assert;
+
+	return 0;
+
+assert:
+	reset_control_assert(vic->rst);
+disable:
+	clk_disable_unprepare(vic->clk);
+	return err;
+}
+
+static int vic_runtime_suspend(struct device *dev)
+{
+	struct vic *vic = dev_get_drvdata(dev);
+	int err;
+
+	err = reset_control_assert(vic->rst);
+	if (err < 0)
+		return err;
+
+	usleep_range(2000, 4000);
+
+	clk_disable_unprepare(vic->clk);
+
+	vic->booted = false;
+
+	return 0;
+}
+
+static int vic_power_on(struct tegra_drm_client *client)
+{
+	struct vic *vic = to_vic(client);
+
+	return pm_runtime_get_sync(vic->dev);
+}
+
+static void vic_power_off(struct tegra_drm_client *client)
+{
+	struct vic *vic = to_vic(client);
+
+	pm_runtime_put(vic->dev);
+}
+
+static int vic_open_channel(struct tegra_drm_client *client,
+			    struct tegra_drm_context *context)
+{
+	struct vic *vic = to_vic(client);
+	int err;
+
+	err = vic_power_on(client);
+	if (err < 0)
+		return err;
 
 	context->channel = host1x_channel_get(vic->channel);
 	if (!context->channel) {
-		err = -ENOMEM;
-		goto rpm_put;
+		vic_power_off(client);
+		return -ENOMEM;
 	}
 
 	return 0;
-
-rpm_put:
-	pm_runtime_put(vic->dev);
-	return err;
 }
 
 static void vic_close_channel(struct tegra_drm_context *context)
 {
-	struct vic *vic = to_vic(context->client);
-
 	host1x_channel_put(context->channel);
 
-	pm_runtime_put(vic->dev);
+	vic_power_off(context->client);
 }
 
 static const struct tegra_drm_client_ops vic_ops = {
+	.power_on = vic_power_on,
+	.power_off = vic_power_off,
 	.open_channel = vic_open_channel,
 	.close_channel = vic_close_channel,
 	.submit = tegra_drm_submit,
-- 
2.28.0