drm/msm/hdmi: switch to drm_bridge_connector

Merge old hdmi_bridge and hdmi_connector implementations. Use
drm_bridge_connector instead.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Link: https://lore.kernel.org/r/20211015001100.4193241-2-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/Makefile

@@ -19,7 +19,7 @@ msm-y := \
 	hdmi/hdmi.o \
 	hdmi/hdmi_audio.o \
 	hdmi/hdmi_bridge.o \
-	hdmi/hdmi_connector.o \
+	hdmi/hdmi_hpd.o \
 	hdmi/hdmi_i2c.o \
 	hdmi/hdmi_phy.o \
 	hdmi/hdmi_phy_8960.o \

drivers/gpu/drm/msm/hdmi/hdmi.c

@@ -8,6 +8,8 @@
 #include <linux/of_irq.h>
 #include <linux/of_gpio.h>
 
+#include <drm/drm_bridge_connector.h>
+
 #include <sound/hdmi-codec.h>
 #include "hdmi.h"
 
@@ -41,7 +43,7 @@ static irqreturn_t msm_hdmi_irq(int irq, void *dev_id)
 	struct hdmi *hdmi = dev_id;
 
 	/* Process HPD: */
-	msm_hdmi_connector_irq(hdmi->connector);
+	msm_hdmi_hpd_irq(hdmi->bridge);
 
 	/* Process DDC: */
 	msm_hdmi_i2c_irq(hdmi->i2c);
@@ -281,14 +283,16 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
 		goto fail;
 	}
 
-	hdmi->connector = msm_hdmi_connector_init(hdmi);
+	hdmi->connector = drm_bridge_connector_init(hdmi->dev, encoder);
 	if (IS_ERR(hdmi->connector)) {
 		ret = PTR_ERR(hdmi->connector);
 		DRM_DEV_ERROR(dev->dev, "failed to create HDMI connector: %d\n", ret);
 		hdmi->connector = NULL;
 		goto fail;
 	}
 
+	drm_connector_attach_encoder(hdmi->connector, hdmi->encoder);
+
 	hdmi->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
 	if (hdmi->irq < 0) {
 		ret = hdmi->irq;
@@ -305,7 +309,9 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
 		goto fail;
 	}
 
-	ret = msm_hdmi_hpd_enable(hdmi->connector);
+	drm_bridge_connector_enable_hpd(hdmi->connector);
+
+	ret = msm_hdmi_hpd_enable(hdmi->bridge);
 	if (ret < 0) {
 		DRM_DEV_ERROR(&hdmi->pdev->dev, "failed to enable HPD: %d\n", ret);
 		goto fail;

drivers/gpu/drm/msm/hdmi/hdmi.h

@@ -114,6 +114,13 @@ struct hdmi_platform_config {
 	struct hdmi_gpio_data gpios[HDMI_MAX_NUM_GPIO];
 };
 
+struct hdmi_bridge {
+	struct drm_bridge base;
+	struct hdmi *hdmi;
+	struct work_struct hpd_work;
+};
+#define to_hdmi_bridge(x) container_of(x, struct hdmi_bridge, base)
+
 void msm_hdmi_set_mode(struct hdmi *hdmi, bool power_on);
 
 static inline void hdmi_write(struct hdmi *hdmi, u32 reg, u32 data)
@@ -230,13 +237,11 @@ void msm_hdmi_audio_set_sample_rate(struct hdmi *hdmi, int rate);
 struct drm_bridge *msm_hdmi_bridge_init(struct hdmi *hdmi);
 void msm_hdmi_bridge_destroy(struct drm_bridge *bridge);
 
-/*
- * hdmi connector:
- */
-
-void msm_hdmi_connector_irq(struct drm_connector *connector);
-struct drm_connector *msm_hdmi_connector_init(struct hdmi *hdmi);
-int msm_hdmi_hpd_enable(struct drm_connector *connector);
+void msm_hdmi_hpd_irq(struct drm_bridge *bridge);
+enum drm_connector_status msm_hdmi_bridge_detect(
+		struct drm_bridge *bridge);
+int msm_hdmi_hpd_enable(struct drm_bridge *bridge);
+void msm_hdmi_hpd_disable(struct hdmi_bridge *hdmi_bridge);
 
 /*
  * i2c adapter for ddc:

drivers/gpu/drm/msm/hdmi/hdmi_bridge.c

@@ -5,17 +5,16 @@
  */
 
 #include <linux/delay.h>
+#include <drm/drm_bridge_connector.h>
 
+#include "msm_kms.h"
 #include "hdmi.h"
 
-struct hdmi_bridge {
-	struct drm_bridge base;
-	struct hdmi *hdmi;
-};
-#define to_hdmi_bridge(x) container_of(x, struct hdmi_bridge, base)
-
 void msm_hdmi_bridge_destroy(struct drm_bridge *bridge)
 {
+	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
+
+	msm_hdmi_hpd_disable(hdmi_bridge);
 }
 
 static void msm_hdmi_power_on(struct drm_bridge *bridge)
@@ -251,14 +250,76 @@ static void msm_hdmi_bridge_mode_set(struct drm_bridge *bridge,
 		msm_hdmi_audio_update(hdmi);
 }
 
+static struct edid *msm_hdmi_bridge_get_edid(struct drm_bridge *bridge,
+		struct drm_connector *connector)
+{
+	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
+	struct hdmi *hdmi = hdmi_bridge->hdmi;
+	struct edid *edid;
+	uint32_t hdmi_ctrl;
+
+	hdmi_ctrl = hdmi_read(hdmi, REG_HDMI_CTRL);
+	hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl | HDMI_CTRL_ENABLE);
+
+	edid = drm_get_edid(connector, hdmi->i2c);
+
+	hdmi_write(hdmi, REG_HDMI_CTRL, hdmi_ctrl);
+
+	hdmi->hdmi_mode = drm_detect_hdmi_monitor(edid);
+
+	return edid;
+}
+
+static enum drm_mode_status msm_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
+		const struct drm_display_info *info,
+		const struct drm_display_mode *mode)
+{
+	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
+	struct hdmi *hdmi = hdmi_bridge->hdmi;
+	const struct hdmi_platform_config *config = hdmi->config;
+	struct msm_drm_private *priv = bridge->dev->dev_private;
+	struct msm_kms *kms = priv->kms;
+	long actual, requested;
+
+	requested = 1000 * mode->clock;
+	actual = kms->funcs->round_pixclk(kms,
+			requested, hdmi_bridge->hdmi->encoder);
+
+	/* for mdp5/apq8074, we manage our own pixel clk (as opposed to
+	 * mdp4/dtv stuff where pixel clk is assigned to mdp/encoder
+	 * instead):
+	 */
+	if (config->pwr_clk_cnt > 0)
+		actual = clk_round_rate(hdmi->pwr_clks[0], actual);
+
+	DBG("requested=%ld, actual=%ld", requested, actual);
+
+	if (actual != requested)
+		return MODE_CLOCK_RANGE;
+
+	return 0;
+}
+
 static const struct drm_bridge_funcs msm_hdmi_bridge_funcs = {
 		.pre_enable = msm_hdmi_bridge_pre_enable,
 		.enable = msm_hdmi_bridge_enable,
 		.disable = msm_hdmi_bridge_disable,
 		.post_disable = msm_hdmi_bridge_post_disable,
 		.mode_set = msm_hdmi_bridge_mode_set,
+		.mode_valid = msm_hdmi_bridge_mode_valid,
+		.get_edid = msm_hdmi_bridge_get_edid,
+		.detect = msm_hdmi_bridge_detect,
 };
 
+static void
+msm_hdmi_hotplug_work(struct work_struct *work)
+{
+	struct hdmi_bridge *hdmi_bridge =
+		container_of(work, struct hdmi_bridge, hpd_work);
+	struct drm_bridge *bridge = &hdmi_bridge->base;
+
+	drm_bridge_hpd_notify(bridge, drm_bridge_detect(bridge));
+}
 
 /* initialize bridge */
 struct drm_bridge *msm_hdmi_bridge_init(struct hdmi *hdmi)
@@ -275,11 +336,17 @@ struct drm_bridge *msm_hdmi_bridge_init(struct hdmi *hdmi)
 	}
 
 	hdmi_bridge->hdmi = hdmi;
+	INIT_WORK(&hdmi_bridge->hpd_work, msm_hdmi_hotplug_work);
 
 	bridge = &hdmi_bridge->base;
 	bridge->funcs = &msm_hdmi_bridge_funcs;
+	bridge->ddc = hdmi->i2c;
+	bridge->type = DRM_MODE_CONNECTOR_HDMIA;
+	bridge->ops = DRM_BRIDGE_OP_HPD |
+		DRM_BRIDGE_OP_DETECT |
+		DRM_BRIDGE_OP_EDID;
 
-	ret = drm_bridge_attach(hdmi->encoder, bridge, NULL, 0);
+	ret = drm_bridge_attach(hdmi->encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 	if (ret)
 		goto fail;