[PATCH v7 22/23] drm/mediatek: Power on devices in OVL adaptor when atomic enable

[Hsiao Chien Sung]

Different from OVL, OVL adaptor is a pseudo device so we didn't
define it in the device tree, consequently, pm_runtime_resume_and_get()
called by .atomic_enable() powers on no device in OVL adaptor and
leads to power outage in the corresponding IOMMU.

To resolve the issue, we implement a function to power on the RDMAs
in OVL adaptor, and the system will make sure the IOMMU is powered on
as well because of the device link (iommus) in the RDMA nodes in DTS.

Fixes: 5db12f5d843b ("media: drm/mediatek: Add pm runtime support for ovl and rdma")

Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
---
 drivers/gpu/drm/mediatek/mtk_disp_drv.h       |  1 +
 .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c   | 49 +++++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c       |  9 ++++
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c   |  1 +
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h   |  9 ++++
 5 files changed, 69 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
index 45b30a2fe11a..971d64261fb9 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
@@ -107,6 +107,7 @@ void mtk_ovl_adaptor_connect(struct device *dev, struct device *mmsys_dev,
 			     unsigned int next);
 void mtk_ovl_adaptor_disconnect(struct device *dev, struct device *mmsys_dev,
 				unsigned int next);
+int mtk_ovl_adaptor_power_on(struct device *dev);
 int mtk_ovl_adaptor_clk_enable(struct device *dev);
 void mtk_ovl_adaptor_clk_disable(struct device *dev);
 void mtk_ovl_adaptor_config(struct device *dev, unsigned int w,
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
index c326a658dc63..ae3b6ba655b1 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
@@ -242,6 +242,55 @@ void mtk_ovl_adaptor_stop(struct device *dev)
 	}
 }
 
+/**
+ * mtk_ovl_adaptor_power_on - Power on devices in OVL adaptor
+ * @dev: device to be powered on
+ *
+ * Different from OVL, OVL adaptor is a pseudo device so
+ * we didn't define it in the device tree, pm_runtime_resume_and_get()
+ * called by .atomic_enable() power on no device in OVL adaptor,
+ * we have to implement a function to do the job instead.
+ *
+ * returns:
+ * zero on success, errno on failure.
+ */
+int mtk_ovl_adaptor_power_on(struct device *dev)
+{
+	int i, ret;
+	struct device *comp;
+	struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
+
+	for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
+		comp = ovl_adaptor->ovl_adaptor_comp[i];
+
+		if (!comp)
+			continue;
+
+		if (comp_matches[i].type != OVL_ADAPTOR_TYPE_MDP_RDMA)
+			continue;
+
+		ret = pm_runtime_resume_and_get(comp);
+		if (ret < 0) {
+			dev_err(dev, "Failed to power on comp(%u): %d\n", i, ret);
+			goto error;
+		}
+	}
+	return 0;
+error:
+	while (--i >= 0) {
+		comp = ovl_adaptor->ovl_adaptor_comp[i];
+
+		if (!comp)
+			continue;
+
+		if (comp_matches[i].type != OVL_ADAPTOR_TYPE_MDP_RDMA)
+			continue;
+
+		pm_runtime_put(comp);
+	}
+	return ret;
+}
+
 int mtk_ovl_adaptor_clk_enable(struct device *dev)
 {
 	int i;
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index b6fa4ad2f94d..5bd62027190b 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -364,6 +364,15 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
 		return ret;
 	}
 
+	for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) {
+		ret = mtk_ddp_comp_power_on(mtk_crtc->ddp_comp[i]);
+		if (ret) {
+			DRM_ERROR("Failed to power on %s: %d\n",
+				  dev_name(mtk_crtc->ddp_comp[i]->dev), ret);
+			return ret;
+		}
+	}
+
 	ret = mtk_mutex_prepare(mtk_crtc->mutex);
 	if (ret < 0) {
 		DRM_ERROR("Failed to enable mutex clock: %d\n", ret);
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index 771f4e173353..e39860f2be78 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -394,6 +394,7 @@ static const struct mtk_ddp_comp_funcs ddp_ufoe = {
 };
 
 static const struct mtk_ddp_comp_funcs ddp_ovl_adaptor = {
+	.power_on = mtk_ovl_adaptor_power_on,
 	.clk_enable = mtk_ovl_adaptor_clk_enable,
 	.clk_disable = mtk_ovl_adaptor_clk_disable,
 	.config = mtk_ovl_adaptor_config,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
index febcaeef16a1..4fef283f17d2 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
@@ -46,6 +46,7 @@ enum mtk_ddp_comp_type {
 struct mtk_ddp_comp;
 struct cmdq_pkt;
 struct mtk_ddp_comp_funcs {
+	int (*power_on)(struct device *dev);
 	int (*clk_enable)(struct device *dev);
 	void (*clk_disable)(struct device *dev);
 	void (*config)(struct device *dev, unsigned int w,
@@ -89,6 +90,14 @@ struct mtk_ddp_comp {
 	const struct mtk_ddp_comp_funcs *funcs;
 };
 
+static inline int mtk_ddp_comp_power_on(struct mtk_ddp_comp *comp)
+{
+	if (comp->funcs && comp->funcs->power_on)
+		return comp->funcs->power_on(comp->dev);
+
+	return 0;
+}
+
 static inline int mtk_ddp_comp_clk_enable(struct mtk_ddp_comp *comp)
 {
 	if (comp->funcs && comp->funcs->clk_enable)
-- 
2.18.0