drm/omap: Move DISPC runtime PM handling to omapdrm

The internal encoders (DSI, HDMI4, HDMI5 and VENC) runtime PM handlers
attempt to manage the runtime PM state of the connected DISPC, based on
the rationale that the DISPC providing data to the encoders requires
ensuring that the display is active whenever the encoders are active.

While the DISPC provides data to the encoders, it doesn't as such
constitute a resource that encoders require in order to be taken out
of suspend, contrary to for instance a functional clock or a power
supply. Encoders registers can be accessed without the DISPC being
active, and while the encoders will not output any video stream without
being fed by the DISPC, the DISPC PM state doesn't influence the
encoders PM state.

For this reason the DISPC PM state is better managed from the omapdrm
driver, in the CRTC enable and disable operations. This allows the
encoders PM state to be handled separately from the DISPC, and in
particular at times when the DISPC may not be available (for instance at
probe due to the DSS probe being deferred, or at remove time du to the
DISPC being already removed).

Fixes: edb715dffdee ("drm/omap: dss: dsi: Move initialization code from bind to probe")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181110111654.4387-5-laurent.pinchart@ideasonboard.com

5 files changed, 6 insertions, 68 deletions

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index b9d5ad7e67d8..36123c086d97 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -5473,19 +5473,12 @@ static int dsi_runtime_suspend(struct device *dev)
 	/* wait for current handler to finish before turning the DSI off */
 	synchronize_irq(dsi->irq);
 
-	dispc_runtime_put(dsi->dss->dispc);
-
 	return 0;
 }
 
 static int dsi_runtime_resume(struct device *dev)
 {
 	struct dsi_data *dsi = dev_get_drvdata(dev);
-	int r;
-
-	r = dispc_runtime_get(dsi->dss->dispc);
-	if (r)
-		return r;
 
 	dsi->is_enabled = true;
 	/* ensure the irq handler sees the is_enabled value */
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4.c b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
index 073fa462930a..aabdda394c9c 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
@@ -841,32 +841,6 @@ static int hdmi4_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static int hdmi_runtime_suspend(struct device *dev)
-{
-	struct omap_hdmi *hdmi = dev_get_drvdata(dev);
-
-	dispc_runtime_put(hdmi->dss->dispc);
-
-	return 0;
-}
-
-static int hdmi_runtime_resume(struct device *dev)
-{
-	struct omap_hdmi *hdmi = dev_get_drvdata(dev);
-	int r;
-
-	r = dispc_runtime_get(hdmi->dss->dispc);
-	if (r < 0)
-		return r;
-
-	return 0;
-}
-
-static const struct dev_pm_ops hdmi_pm_ops = {
-	.runtime_suspend = hdmi_runtime_suspend,
-	.runtime_resume = hdmi_runtime_resume,
-};
-
 static const struct of_device_id hdmi_of_match[] = {
 	{ .compatible = "ti,omap4-hdmi", },
 	{},
@@ -877,7 +851,6 @@ struct platform_driver omapdss_hdmi4hw_driver = {
 	.remove		= hdmi4_remove,
 	.driver         = {
 		.name   = "omapdss_hdmi",
-		.pm	= &hdmi_pm_ops,
 		.of_match_table = hdmi_of_match,
 		.suppress_bind_attrs = true,
 	},
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi5.c b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
index b0e4a7463f8c..9e8556f67a29 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi5.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
@@ -825,32 +825,6 @@ static int hdmi5_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static int hdmi_runtime_suspend(struct device *dev)
-{
-	struct omap_hdmi *hdmi = dev_get_drvdata(dev);
-
-	dispc_runtime_put(hdmi->dss->dispc);
-
-	return 0;
-}
-
-static int hdmi_runtime_resume(struct device *dev)
-{
-	struct omap_hdmi *hdmi = dev_get_drvdata(dev);
-	int r;
-
-	r = dispc_runtime_get(hdmi->dss->dispc);
-	if (r < 0)
-		return r;
-
-	return 0;
-}
-
-static const struct dev_pm_ops hdmi_pm_ops = {
-	.runtime_suspend = hdmi_runtime_suspend,
-	.runtime_resume = hdmi_runtime_resume,
-};
-
 static const struct of_device_id hdmi_of_match[] = {
 	{ .compatible = "ti,omap5-hdmi", },
 	{ .compatible = "ti,dra7-hdmi", },
@@ -862,7 +836,6 @@ struct platform_driver omapdss_hdmi5hw_driver = {
 	.remove		= hdmi5_remove,
 	.driver         = {
 		.name   = "omapdss_hdmi5",
-		.pm	= &hdmi_pm_ops,
 		.of_match_table = hdmi_of_match,
 		.suppress_bind_attrs = true,
 	},
diff --git a/drivers/gpu/drm/omapdrm/dss/venc.c b/drivers/gpu/drm/omapdrm/dss/venc.c
index ff0b18c8e4ac..b5f52727f8b1 100644
--- a/drivers/gpu/drm/omapdrm/dss/venc.c
+++ b/drivers/gpu/drm/omapdrm/dss/venc.c
@@ -946,19 +946,12 @@ static int venc_runtime_suspend(struct device *dev)
 	if (venc->tv_dac_clk)
 		clk_disable_unprepare(venc->tv_dac_clk);
 
-	dispc_runtime_put(venc->dss->dispc);
-
 	return 0;
 }
 
 static int venc_runtime_resume(struct device *dev)
 {
 	struct venc_device *venc = dev_get_drvdata(dev);
-	int r;
-
-	r = dispc_runtime_get(venc->dss->dispc);
-	if (r < 0)
-		return r;
 
 	if (venc->tv_dac_clk)
 		clk_prepare_enable(venc->tv_dac_clk);
diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c
index 62928ec0e7db..caffc547ef97 100644
--- a/drivers/gpu/drm/omapdrm/omap_crtc.c
+++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
@@ -350,11 +350,14 @@ static void omap_crtc_arm_event(struct drm_crtc *crtc)
 static void omap_crtc_atomic_enable(struct drm_crtc *crtc,
 				    struct drm_crtc_state *old_state)
 {
+	struct omap_drm_private *priv = crtc->dev->dev_private;
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 	int ret;
 
 	DBG("%s", omap_crtc->name);
 
+	priv->dispc_ops->runtime_get(priv->dispc);
+
 	spin_lock_irq(&crtc->dev->event_lock);
 	drm_crtc_vblank_on(crtc);
 	ret = drm_crtc_vblank_get(crtc);
@@ -367,6 +370,7 @@ static void omap_crtc_atomic_enable(struct drm_crtc *crtc,
 static void omap_crtc_atomic_disable(struct drm_crtc *crtc,
 				     struct drm_crtc_state *old_state)
 {
+	struct omap_drm_private *priv = crtc->dev->dev_private;
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 
 	DBG("%s", omap_crtc->name);
@@ -379,6 +383,8 @@ static void omap_crtc_atomic_disable(struct drm_crtc *crtc,
 	spin_unlock_irq(&crtc->dev->event_lock);
 
 	drm_crtc_vblank_off(crtc);
+
+	priv->dispc_ops->runtime_put(priv->dispc);
 }
 
 static enum drm_mode_status omap_crtc_mode_valid(struct drm_crtc *crtc,