[PATCH v5 11/15] drm/rockchip: dw_dp: Add runtime PM support

[Sebastian Reichel]

Add support for runtime PM to the Rockchip RK3576/3588 Synopsys
DesignWare DisplayPort driver.

Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/rockchip/dw_dp-rockchip.c | 65 +++++++++++++++++++++++++++++--
 1 file changed, 62 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw_dp-rockchip.c b/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
index 0ecbad24dd4e..b1a69d8821a2 100644
--- a/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/dw_dp-rockchip.c
@@ -12,6 +12,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/videodev2.h>
 
@@ -54,9 +55,15 @@ static void dw_dp_rockchip_hpd_sw_sel(void *data, bool force_hpd_from_sw)
 {
 	struct rockchip_dw_dp *dp = data;
 	u32 hpd_reg = dp->pdata->hpd_reg[dp->id];
+	int ret;
 
 	dp->hpd_sel = force_hpd_from_sw;
 
+	PM_RUNTIME_ACQUIRE_IF_ENABLED_AUTOSUSPEND(dp->dev, pm);
+	ret = PM_RUNTIME_ACQUIRE_ERR(&pm);
+	if (ret)
+		return;
+
 	regmap_write(dp->vo_grf, hpd_reg,
 		     FIELD_PREP_WM16(ROCKCHIP_VO_GRF_DP_SINK_HPD_SEL, dp->hpd_sel));
 }
@@ -65,11 +72,17 @@ static void dw_dp_rockchip_hpd_sw_cfg(void *data, bool hpd)
 {
 	struct rockchip_dw_dp *dp = data;
 	u32 hpd_reg = dp->pdata->hpd_reg[dp->id];
+	int ret;
 
 	dev_dbg(dp->dev, "Force HPD connected=%s\n", str_yes_no(hpd));
 
 	dp->hpd_cfg = hpd;
 
+	PM_RUNTIME_ACQUIRE_IF_ENABLED_AUTOSUSPEND(dp->dev, pm);
+	ret = PM_RUNTIME_ACQUIRE_ERR(&pm);
+	if (ret)
+		return;
+
 	regmap_write(dp->vo_grf, hpd_reg,
 		     FIELD_PREP_WM16(ROCKCHIP_VO_GRF_DP_SINK_HPD_CFG, dp->hpd_cfg));
 }
@@ -165,18 +178,32 @@ static int dw_dp_rockchip_bind(struct device *dev, struct device *master, void *
 		return ret;
 	drm_encoder_helper_add(encoder, &dw_dp_encoder_helper_funcs);
 
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_set_autosuspend_delay(dev, 500);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
 	ret = dw_dp_bind(dp->base, encoder);
 	if (ret)
 		return ret;
 
 	connector = drm_bridge_connector_init(drm_dev, encoder);
 	if (IS_ERR(connector)) {
-		dw_dp_unbind(dp->base);
-		return dev_err_probe(dev, PTR_ERR(connector),
-				     "Failed to init bridge connector\n");
+		ret = PTR_ERR(connector);
+		dev_err_probe(dev, ret, "Failed to init bridge connector\n");
+		goto error;
 	}
 
+	pm_request_idle(dev);
+
 	return 0;
+
+error:
+	pm_runtime_dont_use_autosuspend(dev);
+	pm_runtime_resume(dev);
+	pm_runtime_disable(dev);
+	dw_dp_unbind(dp->base);
+	return ret;
 }
 
 static void dw_dp_rockchip_unbind(struct device *dev, struct device *master,
@@ -185,6 +212,9 @@ static void dw_dp_rockchip_unbind(struct device *dev, struct device *master,
 	struct rockchip_dw_dp *dp = dev_get_drvdata(dev);
 
 	dw_dp_unbind(dp->base);
+	pm_runtime_dont_use_autosuspend(dev);
+	pm_runtime_resume(dev);
+	pm_runtime_disable(dev);
 }
 
 static const struct component_ops dw_dp_rockchip_component_ops = {
@@ -254,6 +284,34 @@ static void dw_dp_rockchip_remove(struct platform_device *pdev)
 	component_del(&pdev->dev, &dw_dp_rockchip_component_ops);
 }
 
+static int dw_dp_rockchip_runtime_suspend(struct device *dev)
+{
+	struct rockchip_dw_dp *dp = dev_get_drvdata(dev);
+
+	return dw_dp_runtime_suspend(dp->base);
+}
+
+static int dw_dp_rockchip_runtime_resume(struct device *dev)
+{
+	struct rockchip_dw_dp *dp = dev_get_drvdata(dev);
+	u32 hpd_reg = dp->pdata->hpd_reg[dp->id];
+	int ret;
+
+	ret = dw_dp_runtime_resume(dp->base);
+	if (ret)
+		return ret;
+
+	regmap_write(dp->vo_grf, hpd_reg,
+		     FIELD_PREP_WM16(ROCKCHIP_VO_GRF_DP_SINK_HPD_SEL, dp->hpd_sel) |
+		     FIELD_PREP_WM16(ROCKCHIP_VO_GRF_DP_SINK_HPD_CFG, dp->hpd_cfg));
+
+	return 0;
+}
+
+static const struct dev_pm_ops dw_dp_pm_ops = {
+	RUNTIME_PM_OPS(dw_dp_rockchip_runtime_suspend, dw_dp_rockchip_runtime_resume, NULL)
+};
+
 static const struct rockchip_dw_dp_plat_data rk3588_dp_plat_data = {
 	.num_ctrls = 2,
 	.ctrl_ids = {0xfde50000, 0xfde60000},
@@ -288,5 +346,6 @@ struct platform_driver dw_dp_driver = {
 	.driver = {
 		.name = "dw-dp",
 		.of_match_table = dw_dp_of_match,
+		.pm = pm_ptr(&dw_dp_pm_ops),
 	},
 };

-- 
2.53.0