[RESEND PATCH v4 4/7] drm/mediatek: mtk_dsi: Convert to bridge driver

Enric Balletbo i Serra
2020-06-15T20:32:01Z

Convert mtk_dsi to a bridge driver with built-in encoder support for
compatibility with existing component drivers.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
---

Changes in v4:
- Remove double call to drm_encoder_init(). (Chun-Kuang Hu)
- Cleanup the encoder in mtk_dsi_unbind(). (Chun-Kuang Hu)

Changes in v3:
- Add the bridge.type. (Laurent Pinchart)

Changes in v2: None

drivers/gpu/drm/mediatek/mtk_dsi.c | 117 +++++++++++++++++++----------
1 file changed, 79 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 208f49bf14a01..759a5b37fb4d2 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -181,6 +181,7 @@ struct mtk_dsi {
struct device *dev;
struct mipi_dsi_host host;
struct drm_encoder encoder;
+ struct drm_bridge bridge;
struct drm_connector conn;
struct drm_panel *panel;
struct drm_bridge *next_bridge;
@@ -206,9 +207,9 @@ struct mtk_dsi {
const struct mtk_dsi_driver_data *driver_data;
};

-static inline struct mtk_dsi *encoder_to_dsi(struct drm_encoder *e)
+static inline struct mtk_dsi *bridge_to_dsi(struct drm_bridge *b)
{
- return container_of(e, struct mtk_dsi, encoder);
+ return container_of(b, struct mtk_dsi, bridge);
}

static inline struct mtk_dsi *connector_to_dsi(struct drm_connector *c)
@@ -788,32 +789,52 @@ static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
dsi->enabled = false;
}

-static bool mtk_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
- const struct drm_display_mode *mode,
- struct drm_display_mode *adjusted_mode)
+static void mtk_dsi_encoder_destroy(struct drm_encoder *encoder)
{
- return true;
+ drm_encoder_cleanup(encoder);
}

-static void mtk_dsi_encoder_mode_set(struct drm_encoder *encoder,
- struct drm_display_mode *mode,
- struct drm_display_mode *adjusted)
+static const struct drm_encoder_funcs mtk_dsi_encoder_funcs = {
+ .destroy = mtk_dsi_encoder_destroy,
+};
+
+static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi);
+static void mtk_dsi_destroy_conn_enc(struct mtk_dsi *dsi);
+
+static int mtk_dsi_bridge_attach(struct drm_bridge *bridge,
+ enum drm_bridge_attach_flags flags)
+{
+ struct mtk_dsi *dsi = bridge_to_dsi(bridge);
+
+ return mtk_dsi_create_conn_enc(bridge->dev, dsi);
+}
+
+static void mtk_dsi_bridge_detach(struct drm_bridge *bridge)
{
- struct mtk_dsi *dsi = encoder_to_dsi(encoder);
+ struct mtk_dsi *dsi = bridge_to_dsi(bridge);
+
+ mtk_dsi_destroy_conn_enc(dsi);
+}
+
+static void mtk_dsi_bridge_mode_set(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode,
+ const struct drm_display_mode *adjusted)
+{
+ struct mtk_dsi *dsi = bridge_to_dsi(bridge);

drm_display_mode_to_videomode(adjusted, &dsi->vm);
}

-static void mtk_dsi_encoder_disable(struct drm_encoder *encoder)
+static void mtk_dsi_bridge_disable(struct drm_bridge *bridge)
{
- struct mtk_dsi *dsi = encoder_to_dsi(encoder);
+ struct mtk_dsi *dsi = bridge_to_dsi(bridge);

mtk_output_dsi_disable(dsi);
}

-static void mtk_dsi_encoder_enable(struct drm_encoder *encoder)
+static void mtk_dsi_bridge_enable(struct drm_bridge *bridge)
{
- struct mtk_dsi *dsi = encoder_to_dsi(encoder);
+ struct mtk_dsi *dsi = bridge_to_dsi(bridge);

mtk_output_dsi_enable(dsi);
}
@@ -825,11 +846,12 @@ static int mtk_dsi_connector_get_modes(struct drm_connector *connector)
return drm_panel_get_modes(dsi->panel, connector);
}

-static const struct drm_encoder_helper_funcs mtk_dsi_encoder_helper_funcs = {
- .mode_fixup = mtk_dsi_encoder_mode_fixup,
- .mode_set = mtk_dsi_encoder_mode_set,
- .disable = mtk_dsi_encoder_disable,
- .enable = mtk_dsi_encoder_enable,
+static const struct drm_bridge_funcs mtk_dsi_bridge_funcs = {
+ .attach = mtk_dsi_bridge_attach,
+ .detach = mtk_dsi_bridge_detach,
+ .disable = mtk_dsi_bridge_disable,
+ .enable = mtk_dsi_bridge_enable,
+ .mode_set = mtk_dsi_bridge_mode_set,
};

static const struct drm_connector_funcs mtk_dsi_connector_funcs = {
@@ -880,20 +902,6 @@ static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi)
{
int ret;

- ret = drm_simple_encoder_init(drm, &dsi->encoder,
- DRM_MODE_ENCODER_DSI);
- if (ret) {
- DRM_ERROR("Failed to encoder init to drm\n");
- return ret;
- }
- drm_encoder_helper_add(&dsi->encoder, &mtk_dsi_encoder_helper_funcs);
-
- /*
- * Currently display data paths are statically assigned to a crtc each.
- * crtc 0 is OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0
- */
- dsi->encoder.possible_crtcs = 1;
-
/* If there's a next bridge, attach to it and let it create the connector */
if (dsi->next_bridge) {
ret = drm_bridge_attach(&dsi->encoder, dsi->next_bridge, NULL,
@@ -1115,6 +1123,34 @@ static const struct mipi_dsi_host_ops mtk_dsi_ops = {
.transfer = mtk_dsi_host_transfer,
};

+static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
+{
+ int ret;
+
+ ret = drm_encoder_init(drm, &dsi->encoder, &mtk_dsi_encoder_funcs,
+ DRM_MODE_ENCODER_DSI, NULL);
+ if (ret) {
+ DRM_ERROR("Failed to encoder init to drm\n");
+ return ret;
+ }
+
+ /*
+ * Currently display data paths are statically assigned to a crtc each.
+ * crtc 0 is OVL0 -> COLOR0 -> AAL -> OD -> RDMA0 -> UFOE -> DSI0
+ */
+ dsi->encoder.possible_crtcs = 1;
+
+ ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
+ if (ret)
+ goto err_cleanup_encoder;
+
+ return 0;
+
+err_cleanup_encoder:
+ drm_encoder_cleanup(&dsi->encoder);
+ return ret;
+}
+
static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
{
int ret;
@@ -1128,11 +1164,9 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
return ret;
}

- ret = mtk_dsi_create_conn_enc(drm, dsi);
- if (ret) {
- DRM_ERROR("Encoder create failed with %d\n", ret);
+ ret = mtk_dsi_encoder_init(drm, dsi);
+ if (ret)
goto err_unregister;
- }

return 0;

@@ -1147,7 +1181,7 @@ static void mtk_dsi_unbind(struct device *dev, struct device *master,
struct drm_device *drm = data;
struct mtk_dsi *dsi = dev_get_drvdata(dev);

- mtk_dsi_destroy_conn_enc(dsi);
+ drm_encoder_cleanup(&dsi->encoder);
mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
}

@@ -1257,6 +1291,12 @@ static int mtk_dsi_probe(struct platform_device *pdev)

platform_set_drvdata(pdev, dsi);

+ dsi->bridge.funcs = &mtk_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(&pdev->dev, &mtk_dsi_component_ops);
if (ret) {
dev_err(&pdev->dev, "failed to add component: %d\n", ret);
@@ -1275,6 +1315,7 @@ static int mtk_dsi_remove(struct platform_device *pdev)
struct mtk_dsi *dsi = platform_get_drvdata(pdev);

mtk_output_dsi_disable(dsi);
+ drm_bridge_remove(&dsi->bridge);
component_del(&pdev->dev, &mtk_dsi_component_ops);
mipi_dsi_host_unregister(&dsi->host);

--
2.27.0