[RESEND PATCH V5 08/12] drm/bridge: ptn3460: Support bridge chaining
Ajay Kumar
ajaykumar.rs at samsung.com
Thu Jul 17 13:43:54 PDT 2014
Modify the driver to invoke callbacks for the next bridge
in the bridge chain.
Also, remove the drm_connector implementation from ptn3460,
since the same is implemented using panel_binder.
Signed-off-by: Ajay Kumar <ajaykumar.rs at samsung.com>
---
drivers/gpu/drm/bridge/ptn3460.c | 137 +++++--------------------------
drivers/gpu/drm/exynos/exynos_dp_core.c | 16 ++--
include/drm/bridge/ptn3460.h | 15 ++--
3 files changed, 39 insertions(+), 129 deletions(-)
diff --git a/drivers/gpu/drm/bridge/ptn3460.c b/drivers/gpu/drm/bridge/ptn3460.c
index d466696..5fe16c6 100644
--- a/drivers/gpu/drm/bridge/ptn3460.c
+++ b/drivers/gpu/drm/bridge/ptn3460.c
@@ -34,37 +34,15 @@
#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
struct ptn3460_bridge {
- struct drm_connector connector;
struct i2c_client *client;
struct drm_encoder *encoder;
struct drm_bridge *bridge;
- struct edid *edid;
int gpio_pd_n;
int gpio_rst_n;
u32 edid_emulation;
bool enabled;
};
-static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
- u8 *buf, int len)
-{
- int ret;
-
- ret = i2c_master_send(ptn_bridge->client, &addr, 1);
- if (ret <= 0) {
- DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
- return ret;
- }
-
- ret = i2c_master_recv(ptn_bridge->client, buf, len);
- if (ret <= 0) {
- DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
- return ret;
- }
-
- return 0;
-}
-
static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
char val)
{
@@ -126,6 +104,8 @@ static void ptn3460_pre_enable(struct drm_bridge *bridge)
gpio_set_value(ptn_bridge->gpio_rst_n, 1);
}
+ drm_next_bridge_pre_enable(bridge);
+
/*
* There's a bug in the PTN chip where it falsely asserts hotplug before
* it is fully functional. We're forced to wait for the maximum start up
@@ -142,6 +122,7 @@ static void ptn3460_pre_enable(struct drm_bridge *bridge)
static void ptn3460_enable(struct drm_bridge *bridge)
{
+ drm_next_bridge_enable(bridge);
}
static void ptn3460_disable(struct drm_bridge *bridge)
@@ -153,6 +134,8 @@ static void ptn3460_disable(struct drm_bridge *bridge)
ptn_bridge->enabled = false;
+ drm_next_bridge_disable(bridge);
+
if (gpio_is_valid(ptn_bridge->gpio_rst_n))
gpio_set_value(ptn_bridge->gpio_rst_n, 1);
@@ -162,6 +145,7 @@ static void ptn3460_disable(struct drm_bridge *bridge)
static void ptn3460_post_disable(struct drm_bridge *bridge)
{
+ drm_next_bridge_post_disable(bridge);
}
void ptn3460_bridge_destroy(struct drm_bridge *bridge)
@@ -173,6 +157,9 @@ void ptn3460_bridge_destroy(struct drm_bridge *bridge)
gpio_free(ptn_bridge->gpio_pd_n);
if (gpio_is_valid(ptn_bridge->gpio_rst_n))
gpio_free(ptn_bridge->gpio_rst_n);
+
+ drm_next_bridge_destroy(bridge);
+
/* Nothing else to free, we've got devm allocated memory */
}
@@ -184,81 +171,10 @@ struct drm_bridge_funcs ptn3460_bridge_funcs = {
.destroy = ptn3460_bridge_destroy,
};
-int ptn3460_get_modes(struct drm_connector *connector)
-{
- struct ptn3460_bridge *ptn_bridge;
- u8 *edid;
- int ret, num_modes;
- bool power_off;
-
- ptn_bridge = container_of(connector, struct ptn3460_bridge, connector);
-
- if (ptn_bridge->edid)
- return drm_add_edid_modes(connector, ptn_bridge->edid);
-
- power_off = !ptn_bridge->enabled;
- ptn3460_pre_enable(ptn_bridge->bridge);
-
- edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
- if (!edid) {
- DRM_ERROR("Failed to allocate edid\n");
- return 0;
- }
-
- ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
- EDID_LENGTH);
- if (ret) {
- kfree(edid);
- num_modes = 0;
- goto out;
- }
-
- ptn_bridge->edid = (struct edid *)edid;
- drm_mode_connector_update_edid_property(connector, ptn_bridge->edid);
-
- num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
-
-out:
- if (power_off)
- ptn3460_disable(ptn_bridge->bridge);
-
- return num_modes;
-}
-
-struct drm_encoder *ptn3460_best_encoder(struct drm_connector *connector)
-{
- struct ptn3460_bridge *ptn_bridge;
-
- ptn_bridge = container_of(connector, struct ptn3460_bridge, connector);
-
- return ptn_bridge->encoder;
-}
-
-struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
- .get_modes = ptn3460_get_modes,
- .best_encoder = ptn3460_best_encoder,
-};
-
-enum drm_connector_status ptn3460_detect(struct drm_connector *connector,
- bool force)
-{
- return connector_status_connected;
-}
-
-void ptn3460_connector_destroy(struct drm_connector *connector)
-{
- drm_connector_cleanup(connector);
-}
-
-struct drm_connector_funcs ptn3460_connector_funcs = {
- .dpms = drm_helper_connector_dpms,
- .fill_modes = drm_helper_probe_single_connector_modes,
- .detect = ptn3460_detect,
- .destroy = ptn3460_connector_destroy,
-};
-
-int ptn3460_init(struct drm_device *dev, struct drm_encoder *encoder,
- struct i2c_client *client, struct device_node *node)
+struct drm_bridge *ptn3460_init(struct drm_device *dev,
+ struct drm_encoder *encoder,
+ struct i2c_client *client,
+ struct device_node *node)
{
int ret;
struct drm_bridge *bridge;
@@ -267,13 +183,13 @@ int ptn3460_init(struct drm_device *dev, struct drm_encoder *encoder,
bridge = devm_kzalloc(dev->dev, sizeof(*bridge), GFP_KERNEL);
if (!bridge) {
DRM_ERROR("Failed to allocate drm bridge\n");
- return -ENOMEM;
+ return NULL;
}
ptn_bridge = devm_kzalloc(dev->dev, sizeof(*ptn_bridge), GFP_KERNEL);
if (!ptn_bridge) {
DRM_ERROR("Failed to allocate ptn bridge\n");
- return -ENOMEM;
+ return NULL;
}
ptn_bridge->client = client;
@@ -285,7 +201,7 @@ int ptn3460_init(struct drm_device *dev, struct drm_encoder *encoder,
GPIOF_OUT_INIT_HIGH, "PTN3460_PD_N");
if (ret) {
DRM_ERROR("Request powerdown-gpio failed (%d)\n", ret);
- return ret;
+ return NULL;
}
}
@@ -300,7 +216,7 @@ int ptn3460_init(struct drm_device *dev, struct drm_encoder *encoder,
if (ret) {
DRM_ERROR("Request reset-gpio failed (%d)\n", ret);
gpio_free(ptn_bridge->gpio_pd_n);
- return ret;
+ return NULL;
}
}
@@ -318,26 +234,17 @@ int ptn3460_init(struct drm_device *dev, struct drm_encoder *encoder,
}
bridge->driver_private = ptn_bridge;
- encoder->bridge = bridge;
+ if (!encoder->bridge)
+ /* First entry in the bridge chain */
+ encoder->bridge = bridge;
- ret = drm_connector_init(dev, &ptn_bridge->connector,
- &ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
- if (ret) {
- DRM_ERROR("Failed to initialize connector with drm\n");
- goto err;
- }
- drm_connector_helper_add(&ptn_bridge->connector,
- &ptn3460_connector_helper_funcs);
- drm_connector_register(&ptn_bridge->connector);
- drm_mode_connector_attach_encoder(&ptn_bridge->connector, encoder);
-
- return 0;
+ return bridge;
err:
if (gpio_is_valid(ptn_bridge->gpio_pd_n))
gpio_free(ptn_bridge->gpio_pd_n);
if (gpio_is_valid(ptn_bridge->gpio_rst_n))
gpio_free(ptn_bridge->gpio_rst_n);
- return ret;
+ return NULL;
}
EXPORT_SYMBOL(ptn3460_init);
diff --git a/drivers/gpu/drm/exynos/exynos_dp_core.c b/drivers/gpu/drm/exynos/exynos_dp_core.c
index b3d0d9b..9d31296 100644
--- a/drivers/gpu/drm/exynos/exynos_dp_core.c
+++ b/drivers/gpu/drm/exynos/exynos_dp_core.c
@@ -988,19 +988,19 @@ static bool find_bridge(const char *compat, struct bridge_init *bridge)
return true;
}
-/* returns the number of bridges attached */
-static int exynos_drm_attach_lcd_bridge(struct drm_device *dev,
+static int exynos_drm_attach_lcd_bridge(struct exynos_dp_device *dp,
struct drm_encoder *encoder)
{
struct bridge_init bridge;
- int ret;
+ struct drm_bridge *bridge_chain = NULL;
+ bool connector_created = false;
if (find_bridge("nxp,ptn3460", &bridge)) {
- ret = ptn3460_init(dev, encoder, bridge.client, bridge.node);
- if (!ret)
- return 1;
+ bridge_chain = ptn3460_init(dp->drm_dev, encoder, bridge.client,
+ bridge.node);
}
- return 0;
+
+ return connector_created;
}
static int exynos_dp_create_connector(struct exynos_drm_display *display,
@@ -1013,7 +1013,7 @@ static int exynos_dp_create_connector(struct exynos_drm_display *display,
dp->encoder = encoder;
/* Pre-empt DP connector creation if there's a bridge */
- ret = exynos_drm_attach_lcd_bridge(dp->drm_dev, encoder);
+ ret = exynos_drm_attach_lcd_bridge(dp, encoder);
if (ret)
return 0;
diff --git a/include/drm/bridge/ptn3460.h b/include/drm/bridge/ptn3460.h
index ff62344..f612b9b 100644
--- a/include/drm/bridge/ptn3460.h
+++ b/include/drm/bridge/ptn3460.h
@@ -21,15 +21,18 @@ struct device_node;
#if defined(CONFIG_DRM_PTN3460) || defined(CONFIG_DRM_PTN3460_MODULE)
-int ptn3460_init(struct drm_device *dev, struct drm_encoder *encoder,
- struct i2c_client *client, struct device_node *node);
+struct drm_bridge *ptn3460_init(struct drm_device *dev,
+ struct drm_encoder *encoder,
+ struct i2c_client *client,
+ struct device_node *node);
#else
-static inline int ptn3460_init(struct drm_device *dev,
- struct drm_encoder *encoder, struct i2c_client *client,
- struct device_node *node)
+static inline struct drm_bridge *ptn3460_init(struct drm_device *dev,
+ struct drm_encoder *encoder,
+ struct i2c_client *client,
+ struct device_node *node)
{
- return 0;
+ return NULL;
}
#endif
--
1.7.9.5
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