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Message-Id: <20250912085846.7349-8-damon.ding@rock-chips.com>
Date: Fri, 12 Sep 2025 16:58:36 +0800
From: Damon Ding <damon.ding@...k-chips.com>
To: andrzej.hajda@...el.com,
neil.armstrong@...aro.org,
rfoss@...nel.org
Cc: Laurent.pinchart@...asonboard.com,
jonas@...boo.se,
jernej.skrabec@...il.com,
maarten.lankhorst@...ux.intel.com,
mripard@...nel.org,
tzimmermann@...e.de,
airlied@...il.com,
simona@...ll.ch,
jingoohan1@...il.com,
inki.dae@...sung.com,
sw0312.kim@...sung.com,
kyungmin.park@...sung.com,
krzk@...nel.org,
alim.akhtar@...sung.com,
hjc@...k-chips.com,
heiko@...ech.de,
andy.yan@...k-chips.com,
dmitry.baryshkov@....qualcomm.com,
dianders@...omium.org,
m.szyprowski@...sung.com,
luca.ceresoli@...tlin.com,
dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org,
linux-rockchip@...ts.infradead.org,
Damon Ding <damon.ding@...k-chips.com>
Subject: [PATCH v5 07/17] drm/exynos: exynos_dp: Add legacy bridge to parse the display-timings node
If there is neither a panel nor a bridge, the display timing can be
parsed from the display-timings node under the dp node.
Adding a legacy bridge to parse the display-timings node would get
rid of &analogix_dp_plat_data.get_modes() and make the codes more
consistent.
Signed-off-by: Damon Ding <damon.ding@...k-chips.com>
---
drivers/gpu/drm/exynos/exynos_dp.c | 132 ++++++++++++++++++-----------
1 file changed, 82 insertions(+), 50 deletions(-)
diff --git a/drivers/gpu/drm/exynos/exynos_dp.c b/drivers/gpu/drm/exynos/exynos_dp.c
index 702128d76ae3..33e9758bc00d 100644
--- a/drivers/gpu/drm/exynos/exynos_dp.c
+++ b/drivers/gpu/drm/exynos/exynos_dp.c
@@ -33,16 +33,90 @@
#define to_dp(nm) container_of(nm, struct exynos_dp_device, nm)
+#define to_legacy_bridge(bridge) container_of(bridge, struct exynos_dp_legacy_bridge, base)
+
struct exynos_dp_device {
struct drm_encoder encoder;
struct drm_device *drm_dev;
struct device *dev;
- struct videomode vm;
struct analogix_dp_device *adp;
struct analogix_dp_plat_data plat_data;
};
+struct exynos_dp_legacy_bridge {
+ struct drm_bridge base;
+ struct drm_display_mode mode;
+
+ u32 bus_flags;
+};
+
+static int exynos_dp_legacy_bridge_attach(struct drm_bridge *bridge,
+ struct drm_encoder *encoder,
+ enum drm_bridge_attach_flags flags)
+{
+ if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int exynos_dp_legacy_bridge_get_modes(struct drm_bridge *bridge,
+ struct drm_connector *connector)
+{
+ struct exynos_dp_legacy_bridge *legacy_bridge = to_legacy_bridge(bridge);
+ int ret;
+
+ ret = drm_connector_helper_get_modes_fixed(connector, &legacy_bridge->mode);
+ if (ret)
+ return ret;
+
+ connector->display_info.bus_flags = legacy_bridge->bus_flags;
+
+ return 0;
+}
+
+struct drm_bridge_funcs exynos_dp_legacy_bridge_funcs = {
+ .attach = exynos_dp_legacy_bridge_attach,
+ .get_modes = exynos_dp_legacy_bridge_get_modes,
+};
+
+static int exynos_dp_dt_parse_legacy_bridge(struct exynos_dp_device *dp,
+ struct drm_bridge **bridge)
+{
+ struct exynos_dp_legacy_bridge *legacy_bridge;
+ int ret;
+
+ if (!bridge)
+ return -EINVAL;
+
+ legacy_bridge = devm_drm_bridge_alloc(dp->dev, struct exynos_dp_legacy_bridge,
+ base, &exynos_dp_legacy_bridge_funcs);
+ if (IS_ERR(legacy_bridge))
+ return PTR_ERR(legacy_bridge);
+
+ ret = of_get_drm_display_mode(dp->dev->of_node,
+ &legacy_bridge->mode,
+ &legacy_bridge->bus_flags,
+ OF_USE_NATIVE_MODE);
+ if (ret)
+ return ret;
+
+ legacy_bridge->mode.type |= DRM_MODE_TYPE_DRIVER;
+
+ legacy_bridge->base.of_node = dp->dev->of_node;
+ legacy_bridge->base.ops = DRM_BRIDGE_OP_MODES;
+ legacy_bridge->base.type = DRM_MODE_CONNECTOR_eDP;
+
+ ret = devm_drm_bridge_add(dp->dev, &legacy_bridge->base);
+ if (ret)
+ return ret;
+
+ *bridge = &legacy_bridge->base;
+
+ return 0;
+}
+
static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
bool enable)
{
@@ -67,44 +141,20 @@ static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
return exynos_dp_crtc_clock_enable(plat_data, false);
}
-static int exynos_dp_get_modes(struct analogix_dp_plat_data *plat_data,
- struct drm_connector *connector)
-{
- struct exynos_dp_device *dp = to_dp(plat_data);
- struct drm_display_mode *mode;
-
- if (dp->plat_data.panel)
- return 0;
-
- mode = drm_mode_create(connector->dev);
- if (!mode) {
- DRM_DEV_ERROR(dp->dev,
- "failed to create a new display mode.\n");
- return 0;
- }
-
- drm_display_mode_from_videomode(&dp->vm, mode);
- connector->display_info.width_mm = mode->width_mm;
- connector->display_info.height_mm = mode->height_mm;
-
- mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
- drm_mode_set_name(mode);
- drm_mode_probed_add(connector, mode);
-
- return 1;
-}
-
static int exynos_dp_bridge_attach(struct analogix_dp_plat_data *plat_data,
struct drm_bridge *bridge,
struct drm_connector *connector)
{
struct exynos_dp_device *dp = to_dp(plat_data);
+ enum drm_bridge_attach_flags flags = 0;
int ret;
/* Pre-empt DP connector creation if there's a bridge */
if (plat_data->next_bridge) {
- ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge,
- 0);
+ if (plat_data->next_bridge->funcs == &exynos_dp_legacy_bridge_funcs)
+ flags = DRM_BRIDGE_ATTACH_NO_CONNECTOR;
+
+ ret = drm_bridge_attach(&dp->encoder, plat_data->next_bridge, bridge, flags);
if (ret)
return ret;
}
@@ -129,19 +179,6 @@ static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
.disable = exynos_dp_nop,
};
-static int exynos_dp_dt_parse_panel(struct exynos_dp_device *dp)
-{
- int ret;
-
- ret = of_get_videomode(dp->dev->of_node, &dp->vm, OF_USE_NATIVE_MODE);
- if (ret) {
- DRM_DEV_ERROR(dp->dev,
- "failed: of_get_videomode() : %d\n", ret);
- return ret;
- }
- return 0;
-}
-
static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
{
struct exynos_dp_device *dp = dev_get_drvdata(dev);
@@ -151,12 +188,6 @@ static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
dp->drm_dev = drm_dev;
- if (!dp->plat_data.panel && !dp->plat_data.next_bridge) {
- ret = exynos_dp_dt_parse_panel(dp);
- if (ret)
- return ret;
- }
-
drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);
@@ -223,6 +254,8 @@ static int exynos_dp_probe(struct platform_device *pdev)
}
ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, &panel, &bridge);
+ if (ret == -ENODEV)
+ ret = exynos_dp_dt_parse_legacy_bridge(dp, &bridge);
if (ret)
return ret;
@@ -233,7 +266,6 @@ static int exynos_dp_probe(struct platform_device *pdev)
dp->plat_data.power_on = exynos_dp_poweron;
dp->plat_data.power_off = exynos_dp_poweroff;
dp->plat_data.attach = exynos_dp_bridge_attach;
- dp->plat_data.get_modes = exynos_dp_get_modes;
out:
dp->adp = analogix_dp_probe(dev, &dp->plat_data);
--
2.34.1
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