From 3fbeba522e0761b23285e62bf63e001068608b28 Mon Sep 17 00:00:00 2001
From: Jagan Teki <jagan@amarulasolutions.com>
Date: Mon, 22 Nov 2021 12:36:32 +0530
Subject: drm: exynos: dsi: Convert to bridge driver
Git-commit: 92e794fab87af0793403d5e4a547f0be94a0e656
Patch-mainline: v5.18-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
Some display panels would come up with a non-DSI output, those
can have an option to connect the DSI host by means of interface
bridge converter.
This DSI to non-DSI interface bridge converter would requires
DSI Host to handle drm bridge functionalities in order to DSI
Host to Interface bridge.
This patch convert the existing to a drm bridge driver with a
built-in encoder support for compatibility with existing
component drivers.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211122070633.89219-2-jagan@amarulasolutions.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/exynos/exynos_drm_dsi.c | 73 +++++++++++++++++--------
1 file changed, 51 insertions(+), 22 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index d13f5e3a030d..e937d94e56e9 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -256,6 +256,7 @@ struct exynos_dsi {
struct drm_connector connector;
struct drm_panel *panel;
struct list_head bridge_chain;
+ struct drm_bridge bridge;
struct drm_bridge *out_bridge;
struct device *dev;
@@ -286,9 +287,9 @@ struct exynos_dsi {
#define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host)
#define connector_to_dsi(c) container_of(c, struct exynos_dsi, connector)
-static inline struct exynos_dsi *encoder_to_dsi(struct drm_encoder *e)
+static inline struct exynos_dsi *bridge_to_dsi(struct drm_bridge *b)
{
- return container_of(e, struct exynos_dsi, encoder);
+ return container_of(b, struct exynos_dsi, bridge);
}
enum reg_idx {
@@ -1364,9 +1365,10 @@ static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
}
}
-static void exynos_dsi_enable(struct drm_encoder *encoder)
+static void exynos_dsi_atomic_enable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
{
- struct exynos_dsi *dsi = encoder_to_dsi(encoder);
+ struct exynos_dsi *dsi = bridge_to_dsi(bridge);
struct drm_bridge *iter;
int ret;
@@ -1389,7 +1391,8 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
list_for_each_entry_reverse(iter, &dsi->bridge_chain,
chain_node) {
if (iter->funcs->pre_enable)
- iter->funcs->pre_enable(iter);
+ iter->funcs->atomic_pre_enable(iter,
+ old_bridge_state);
}
}
@@ -1403,7 +1406,7 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
} else {
list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
if (iter->funcs->enable)
- iter->funcs->enable(iter);
+ iter->funcs->atomic_enable(iter, old_bridge_state);
}
}
@@ -1419,9 +1422,10 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
pm_runtime_put(dsi->dev);
}
-static void exynos_dsi_disable(struct drm_encoder *encoder)
+static void exynos_dsi_atomic_disable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
{
- struct exynos_dsi *dsi = encoder_to_dsi(encoder);
+ struct exynos_dsi *dsi = bridge_to_dsi(bridge);
struct drm_bridge *iter;
if (!(dsi->state & DSIM_STATE_ENABLED))
@@ -1433,7 +1437,7 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
if (iter->funcs->disable)
- iter->funcs->disable(iter);
+ iter->funcs->atomic_disable(iter, old_bridge_state);
}
exynos_dsi_set_display_enable(dsi, false);
@@ -1441,7 +1445,7 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
if (iter->funcs->post_disable)
- iter->funcs->post_disable(iter);
+ iter->funcs->atomic_post_disable(iter, old_bridge_state);
}
dsi->state &= ~DSIM_STATE_ENABLED;
@@ -1484,9 +1488,9 @@ static const struct drm_connector_helper_funcs exynos_dsi_connector_helper_funcs
.get_modes = exynos_dsi_get_modes,
};
-static int exynos_dsi_create_connector(struct drm_encoder *encoder)
+static int exynos_dsi_create_connector(struct exynos_dsi *dsi)
{
- struct exynos_dsi *dsi = encoder_to_dsi(encoder);
+ struct drm_encoder *encoder = &dsi->encoder;
struct drm_connector *connector = &dsi->connector;
struct drm_device *drm = encoder->dev;
int ret;
@@ -1512,9 +1516,21 @@ static int exynos_dsi_create_connector(struct drm_encoder *encoder)
return 0;
}
-static const struct drm_encoder_helper_funcs exynos_dsi_encoder_helper_funcs = {
- .enable = exynos_dsi_enable,
- .disable = exynos_dsi_disable,
+static int exynos_dsi_attach(struct drm_bridge *bridge,
+ enum drm_bridge_attach_flags flags)
+{
+ struct exynos_dsi *dsi = bridge_to_dsi(bridge);
+
+ return drm_bridge_attach(bridge->encoder, dsi->out_bridge, NULL, 0);
+}
+
+static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
+ .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+ .atomic_reset = drm_atomic_helper_bridge_reset,
+ .atomic_enable = exynos_dsi_atomic_enable,
+ .atomic_disable = exynos_dsi_atomic_disable,
+ .attach = exynos_dsi_attach,
};
MODULE_DEVICE_TABLE(of, exynos_dsi_of_match);
@@ -1533,7 +1549,7 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
dsi->out_bridge = out_bridge;
list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
} else {
- int ret = exynos_dsi_create_connector(encoder);
+ int ret = exynos_dsi_create_connector(dsi);
if (ret) {
DRM_DEV_ERROR(dsi->dev,
@@ -1586,7 +1602,7 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
if (dsi->panel) {
mutex_lock(&drm->mode_config.mutex);
- exynos_dsi_disable(&dsi->encoder);
+ exynos_dsi_atomic_disable(&dsi->bridge, NULL);
dsi->panel = NULL;
dsi->connector.status = connector_status_disconnected;
mutex_unlock(&drm->mode_config.mutex);
@@ -1692,12 +1708,16 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
- drm_encoder_helper_add(encoder, &exynos_dsi_encoder_helper_funcs);
-
ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
if (ret < 0)
return ret;
+ ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
+ if (ret) {
+ drm_encoder_cleanup(&dsi->encoder);
+ return ret;
+ }
+
in_bridge_node = of_graph_get_remote_node(dev->of_node, DSI_PORT_IN, 0);
if (in_bridge_node) {
in_bridge = of_drm_find_bridge(in_bridge_node);
@@ -1713,10 +1733,9 @@ static void exynos_dsi_unbind(struct device *dev, struct device *master,
void *data)
{
struct exynos_dsi *dsi = dev_get_drvdata(dev);
- struct drm_encoder *encoder = &dsi->encoder;
-
- exynos_dsi_disable(encoder);
+ exynos_dsi_atomic_disable(&dsi->bridge, NULL);
+ drm_encoder_cleanup(&dsi->encoder);
mipi_dsi_host_unregister(&dsi->dsi_host);
}
@@ -1806,6 +1825,12 @@ static int exynos_dsi_probe(struct platform_device *pdev)
pm_runtime_enable(dev);
+ dsi->bridge.funcs = &exynos_dsi_bridge_funcs;
+ dsi->bridge.of_node = dev->of_node;
+ dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
+
+ drm_bridge_add(&dsi->bridge);
+
ret = component_add(dev, &exynos_dsi_component_ops);
if (ret)
goto err_disable_runtime;
@@ -1820,6 +1845,10 @@ static int exynos_dsi_probe(struct platform_device *pdev)
static int exynos_dsi_remove(struct platform_device *pdev)
{
+ struct exynos_dsi *dsi = platform_get_drvdata(pdev);
+
+ drm_bridge_remove(&dsi->bridge);
+
pm_runtime_disable(&pdev->dev);
component_del(&pdev->dev, &exynos_dsi_component_ops);
--
2.38.1