[RFC PATCH 2/8] drm: exynos/dp: convert to drm bridge mode

Yakir Yang
2015-08-06T14:09:35Z

In order to move exynos dp code to bridge directory,
we need to convert driver drm bridge mode first. As
dp driver already have a ptn3460 bridge, so we need
to move ptn bridge to the next bridge of dp bridge.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
---
drivers/gpu/drm/exynos/exynos_dp_core.c | 196 ++++++++++++++++++++------------
drivers/gpu/drm/exynos/exynos_dp_core.h | 2 +
2 files changed, 126 insertions(+), 72 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
index a8097a4..aa99e23 100644
--- a/drivers/gpu/drm/exynos/exynos_dp_core.c
+++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
@@ -3,6 +3,7 @@
*
* Copyright (C) 2012 Samsung Electronics Co., Ltd.
* Author: Jingoo Han <jg1.han@samsung.com>
+ * Yakir Yang <ykk@rock-chips.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@@ -998,59 +999,6 @@ static struct drm_connector_helper_funcs exynos_dp_connector_helper_funcs = {
.best_encoder = exynos_dp_best_encoder,
};

-/* returns the number of bridges attached */
-static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
- struct drm_encoder *encoder)
-{
- int ret;
-
- encoder->bridge = dp->bridge;
- dp->bridge->encoder = encoder;
- ret = drm_bridge_attach(encoder->dev, dp->bridge);
- if (ret) {
- DRM_ERROR("Failed to attach bridge to drm\n");
- return ret;
- }
-
- return 0;
-}
-
-static int exynos_dp_create_connector(struct exynos_drm_display *display,
- struct drm_encoder *encoder)
-{
- struct exynos_dp_device *dp = display_to_dp(display);
- struct drm_connector *connector = &dp->connector;
- int ret;
-
- dp->encoder = encoder;
-
- /* Pre-empt DP connector creation if there's a bridge */
- if (dp->bridge) {
- ret = exynos_drm_attach_lcd_bridge(dp, encoder);
- if (!ret)
- return 0;
- }
-
- connector->polled = DRM_CONNECTOR_POLL_HPD;
-
- ret = drm_connector_init(dp->drm_dev, connector,
- &exynos_dp_connector_funcs,
- DRM_MODE_CONNECTOR_eDP);
- if (ret) {
- DRM_ERROR("Failed to initialize connector with drm\n");
- return ret;
- }
-
- drm_connector_helper_add(connector, &exynos_dp_connector_helper_funcs);
- drm_connector_register(connector);
- drm_mode_connector_attach_encoder(connector, encoder);
-
- if (dp->panel)
- ret = drm_panel_attach(dp->panel, &dp->connector);
-
- return ret;
-}
-
static void exynos_dp_phy_init(struct exynos_dp_device *dp)
{
if (dp->phy)
@@ -1115,23 +1063,126 @@ static void exynos_dp_poweroff(struct exynos_dp_device *dp)
}
}

-static void exynos_dp_dpms(struct exynos_drm_display *display, int mode)
+/* returns the number of bridges attached */
+static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
+ struct drm_encoder *encoder)
+{
+ int ret;
+
+ dp->bridge->next = dp->ptn_bridge;
+ dp->bridge->encoder = encoder;
+ ret = drm_bridge_attach(encoder->dev, dp->bridge);
+ if (ret) {
+ DRM_ERROR("Failed to attach ptn bridge to drm\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int exynos_dp_bridge_attach(struct drm_bridge *bridge)
+{
+
+ struct exynos_dp_device *dp = bridge->driver_private;
+ struct drm_encoder *encoder = dp->encoder;
+ struct drm_connector *connector = &dp->connector;
+ int ret;
+
+ if (!bridge->encoder) {
+ DRM_ERROR("Parent encoder object not found");
+ return -ENODEV;
+ }
+
+ encoder->bridge = bridge;
+
+ /* Pre-empt DP connector creation if there's a bridge */
+ if (dp->ptn_bridge) {
+ ret = exynos_drm_attach_lcd_bridge(dp, encoder);
+ if (ret)
+ return -ENODEV;
+ }
+
+ connector->polled = DRM_CONNECTOR_POLL_HPD;
+
+ ret = drm_connector_init(dp->drm_dev, connector,
+ &exynos_dp_connector_funcs, DRM_MODE_CONNECTOR_eDP);
+ if (ret) {
+ DRM_ERROR("Failed to initialize connector with drm\n");
+ return ret;
+ }
+
+ drm_connector_helper_add(connector, &exynos_dp_connector_helper_funcs);
+ drm_connector_register(connector);
+ drm_mode_connector_attach_encoder(connector, encoder);
+
+ if (dp->panel)
+ ret = drm_panel_attach(dp->panel, &dp->connector);
+
+ return ret;
+}
+
+static void exynos_dp_bridge_nop(struct drm_bridge *bridge)
+{
+ /* do nothing */
+}
+
+static void exynos_dp_bridge_enable(struct drm_bridge *bridge)
+{
+ struct exynos_dp_device *dp = bridge->driver_private;
+
+ exynos_dp_poweron(dp);
+ dp->dpms_mode = DRM_MODE_DPMS_ON;
+}
+
+static void exynos_dp_bridge_disable(struct drm_bridge *bridge)
+{
+ struct exynos_dp_device *dp = bridge->driver_private;
+
+ exynos_dp_poweroff(dp);
+ dp->dpms_mode = DRM_MODE_DPMS_OFF;
+}
+
+static const struct drm_bridge_funcs exynos_dp_bridge_funcs = {
+ .enable = exynos_dp_bridge_enable,
+ .disable = exynos_dp_bridge_disable,
+ .pre_enable = exynos_dp_bridge_nop,
+ .post_disable = exynos_dp_bridge_nop,
+ .attach = exynos_dp_bridge_attach,
+};
+
+static int exynos_dp_create_connector(struct exynos_drm_display *display,
+ struct drm_encoder *encoder)
{
struct exynos_dp_device *dp = display_to_dp(display);
+ struct drm_device *drm_dev = dp->drm_dev;
+ struct drm_bridge *bridge;
+ int ret;

- switch (mode) {
- case DRM_MODE_DPMS_ON:
- exynos_dp_poweron(dp);
- break;
- case DRM_MODE_DPMS_STANDBY:
- case DRM_MODE_DPMS_SUSPEND:
- case DRM_MODE_DPMS_OFF:
- exynos_dp_poweroff(dp);
- break;
- default:
- break;
+ bridge = devm_kzalloc(drm_dev->dev, sizeof(*bridge), GFP_KERNEL);
+ if (!bridge) {
+ DRM_ERROR("failed to allocate for drm bridge\n");
+ return -ENOMEM;
}
- dp->dpms_mode = mode;
+
+ dp->bridge = bridge;
+ dp->encoder = encoder;
+
+ bridge->driver_private = dp;
+ bridge->encoder = dp->encoder;
+ bridge->funcs = &exynos_dp_bridge_funcs;
+
+ ret = drm_bridge_attach(drm_dev, bridge);
+ if (ret) {
+ DRM_ERROR("failed to attach drm bridge\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void exynos_dp_dpms(struct exynos_drm_display *display, int mode)
+{
+ /* do nothing */
}

static struct exynos_drm_display_ops exynos_dp_display_ops = {
@@ -1243,7 +1294,7 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
}
}

- if (!dp->panel && !dp->bridge) {
+ if (!dp->panel && !dp->ptn_bridge) {
ret = exynos_dp_dt_parse_panel(dp);
if (ret)
return ret;
@@ -1316,7 +1367,7 @@ static void exynos_dp_unbind(struct device *dev, struct device *master,
{
struct exynos_dp_device *dp = dev_get_drvdata(dev);

- exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_OFF);
+ exynos_dp_bridge_disable(dp->bridge);
}

static const struct component_ops exynos_dp_ops = {
@@ -1351,9 +1402,9 @@ static int exynos_dp_probe(struct platform_device *pdev)
if (endpoint) {
bridge_node = of_graph_get_remote_port_parent(endpoint);
if (bridge_node) {
- dp->bridge = of_drm_find_bridge(bridge_node);
+ dp->ptn_bridge = of_drm_find_bridge(bridge_node);
of_node_put(bridge_node);
- if (!dp->bridge)
+ if (!dp->ptn_bridge)
return -EPROBE_DEFER;
} else {
return -EPROBE_DEFER;
@@ -1375,7 +1426,7 @@ static int exynos_dp_suspend(struct device *dev)
{
struct exynos_dp_device *dp = dev_get_drvdata(dev);

- exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_OFF);
+ exynos_dp_bridge_disable(dp->bridge);
return 0;
}

@@ -1383,7 +1434,7 @@ static int exynos_dp_resume(struct device *dev)
{
struct exynos_dp_device *dp = dev_get_drvdata(dev);

- exynos_dp_dpms(&dp->display, DRM_MODE_DPMS_ON);
+ exynos_dp_bridge_enable(dp->bridge);
return 0;
}
#endif
@@ -1410,5 +1461,6 @@ struct platform_driver dp_driver = {
};

MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
+MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
MODULE_DESCRIPTION("Samsung SoC DP Driver");
MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.h b/drivers/gpu/drm/exynos/exynos_dp_core.h
index c321ad5..f2584b8 100644
--- a/drivers/gpu/drm/exynos/exynos_dp_core.h
+++ b/drivers/gpu/drm/exynos/exynos_dp_core.h
@@ -3,6 +3,7 @@
*
* Copyright (C) 2012 Samsung Electronics Co., Ltd.
* Author: Jingoo Han <jg1.han@samsung.com>
+ * Yakir Yang <ykk@rock-chips.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@@ -154,6 +155,7 @@ struct exynos_dp_device {
struct drm_encoder *encoder;
struct drm_panel *panel;
struct drm_bridge *bridge;
+ struct drm_bridge *ptn_bridge;
struct clk *clock;
unsigned int irq;
void __iomem *reg_base;
--
2.1.2