[RESEND PATCH v4 6/7] drm/mediatek: mtk_dsi: Use the drm_panel_bridge API

Enric Balletbo i Serra
2020-06-15T20:31:38Z

Replace the manual panel handling code by a drm_panel_bridge. This
simplifies the driver and allows all components in the display pipeline
to be treated as bridges, paving the way to generic connector handling.

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

Changes in v4: None
Changes in v3:
- Use next_bridge field to store the panel bridge. (Laurent Pinchart)
- Add the bridge.type field. (Laurent Pinchart)
- This patch requires https://lkml.org/lkml/2020/4/16/2080 to work
properly.

Changes in v2:
- Do not set connector_type for panel here. (Sam Ravnborg)

drivers/gpu/drm/mediatek/mtk_dsi.c | 173 +++--------------------------
1 file changed, 14 insertions(+), 159 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index e02d16a086ac0..4f3bd095c1eee 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -182,8 +182,6 @@ struct mtk_dsi {
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;
struct phy *phy;

@@ -212,11 +210,6 @@ static inline struct mtk_dsi *bridge_to_dsi(struct drm_bridge *b)
return container_of(b, struct mtk_dsi, bridge);
}

-static inline struct mtk_dsi *connector_to_dsi(struct drm_connector *c)
-{
- return container_of(c, struct mtk_dsi, conn);
-}
-
static inline struct mtk_dsi *host_to_dsi(struct mipi_dsi_host *h)
{
return container_of(h, struct mtk_dsi, host);
@@ -682,16 +675,7 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
mtk_dsi_lane0_ulp_mode_leave(dsi);
mtk_dsi_clk_hs_mode(dsi, 0);

- if (dsi->panel) {
- if (drm_panel_prepare(dsi->panel)) {
- DRM_ERROR("failed to prepare the panel\n");
- goto err_disable_digital_clk;
- }
- }
-
return 0;
-err_disable_digital_clk:
- clk_disable_unprepare(dsi->digital_clk);
err_disable_engine_clk:
clk_disable_unprepare(dsi->engine_clk);
err_phy_power_off:
@@ -718,15 +702,7 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
*/
mtk_dsi_stop(dsi);

- if (!mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500)) {
- if (dsi->panel) {
- if (drm_panel_unprepare(dsi->panel)) {
- DRM_ERROR("failed to unprepare the panel\n");
- return;
- }
- }
- }
-
+ mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500);
mtk_dsi_reset_engine(dsi);
mtk_dsi_lane0_ulp_mode_enter(dsi);
mtk_dsi_clk_ulp_mode_enter(dsi);
@@ -757,19 +733,7 @@ static void mtk_output_dsi_enable(struct mtk_dsi *dsi)

mtk_dsi_start(dsi);

- if (dsi->panel) {
- if (drm_panel_enable(dsi->panel)) {
- DRM_ERROR("failed to enable the panel\n");
- goto err_dsi_power_off;
- }
- }
-
dsi->enabled = true;
-
- return;
-err_dsi_power_off:
- mtk_dsi_stop(dsi);
- mtk_dsi_poweroff(dsi);
}

static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
@@ -777,34 +741,19 @@ static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
if (!dsi->enabled)
return;

- if (dsi->panel) {
- if (drm_panel_disable(dsi->panel)) {
- DRM_ERROR("failed to disable the panel\n");
- return;
- }
- }
-
mtk_dsi_poweroff(dsi);

dsi->enabled = false;
}

-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 = bridge_to_dsi(bridge);
-
- mtk_dsi_destroy_conn_enc(dsi);
+ /* Attach the panel or bridge to the dsi bridge */
+ return drm_bridge_attach(bridge->encoder, dsi->next_bridge,
+ &dsi->bridge, flags);
}

static void mtk_dsi_bridge_mode_set(struct drm_bridge *bridge,
@@ -830,101 +779,13 @@ static void mtk_dsi_bridge_enable(struct drm_bridge *bridge)
mtk_output_dsi_enable(dsi);
}

-static int mtk_dsi_connector_get_modes(struct drm_connector *connector)
-{
- struct mtk_dsi *dsi = connector_to_dsi(connector);
-
- return drm_panel_get_modes(dsi->panel, connector);
-}
-
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 = {
- .fill_modes = drm_helper_probe_single_connector_modes,
- .destroy = drm_connector_cleanup,
- .reset = drm_atomic_helper_connector_reset,
- .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
- .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
-};
-
-static const struct drm_connector_helper_funcs
- mtk_dsi_connector_helper_funcs = {
- .get_modes = mtk_dsi_connector_get_modes,
-};
-
-static int mtk_dsi_create_connector(struct drm_device *drm, struct mtk_dsi *dsi)
-{
- int ret;
-
- ret = drm_connector_init(drm, &dsi->conn, &mtk_dsi_connector_funcs,
- DRM_MODE_CONNECTOR_DSI);
- if (ret) {
- DRM_ERROR("Failed to connector init to drm\n");
- return ret;
- }
-
- drm_connector_helper_add(&dsi->conn, &mtk_dsi_connector_helper_funcs);
-
- dsi->conn.dpms = DRM_MODE_DPMS_OFF;
- drm_connector_attach_encoder(&dsi->conn, &dsi->encoder);
-
- if (dsi->panel) {
- ret = drm_panel_attach(dsi->panel, &dsi->conn);
- if (ret) {
- DRM_ERROR("Failed to attach panel to drm\n");
- goto err_connector_cleanup;
- }
- }
-
- return 0;
-
-err_connector_cleanup:
- drm_connector_cleanup(&dsi->conn);
- return ret;
-}
-
-static int mtk_dsi_create_conn_enc(struct drm_device *drm, struct mtk_dsi *dsi)
-{
- int ret;
-
- /* 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,
- 0);
- if (ret) {
- DRM_ERROR("Failed to attach bridge to drm\n");
- goto err_encoder_cleanup;
- }
- } else {
- /* Otherwise create our own connector and attach to a panel */
- ret = mtk_dsi_create_connector(drm, dsi);
- if (ret)
- goto err_encoder_cleanup;
- }
-
- return 0;
-
-err_encoder_cleanup:
- drm_encoder_cleanup(&dsi->encoder);
- return ret;
-}
-
-static void mtk_dsi_destroy_conn_enc(struct mtk_dsi *dsi)
-{
- drm_encoder_cleanup(&dsi->encoder);
- /* Skip connector cleanup if creation was delegated to the bridge */
- if (dsi->conn.dev)
- drm_connector_cleanup(&dsi->conn);
- if (dsi->panel)
- drm_panel_detach(dsi->panel);
-}
-
static void mtk_dsi_ddp_start(struct mtk_ddp_comp *comp)
{
struct mtk_dsi *dsi = container_of(comp, struct mtk_dsi, ddp_comp);
@@ -953,20 +814,6 @@ static int mtk_dsi_host_attach(struct mipi_dsi_host *host,
dsi->format = device->format;
dsi->mode_flags = device->mode_flags;

- if (dsi->conn.dev)
- drm_helper_hpd_irq_event(dsi->conn.dev);
-
- return 0;
-}
-
-static int mtk_dsi_host_detach(struct mipi_dsi_host *host,
- struct mipi_dsi_device *device)
-{
- struct mtk_dsi *dsi = host_to_dsi(host);
-
- if (dsi->conn.dev)
- drm_helper_hpd_irq_event(dsi->conn.dev);
-
return 0;
}

@@ -1110,7 +957,6 @@ static ssize_t mtk_dsi_host_transfer(struct mipi_dsi_host *host,

static const struct mipi_dsi_host_ops mtk_dsi_ops = {
.attach = mtk_dsi_host_attach,
- .detach = mtk_dsi_host_detach,
.transfer = mtk_dsi_host_transfer,
};

@@ -1185,6 +1031,7 @@ static int mtk_dsi_probe(struct platform_device *pdev)
{
struct mtk_dsi *dsi;
struct device *dev = &pdev->dev;
+ struct drm_panel *panel;
struct resource *regs;
int irq_num;
int comp_id;
@@ -1203,10 +1050,18 @@ static int mtk_dsi_probe(struct platform_device *pdev)
}

ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
- &dsi->panel, &dsi->next_bridge);
+ &panel, &dsi->next_bridge);
if (ret)
goto err_unregister_host;

+ if (panel) {
+ dsi->next_bridge = devm_drm_panel_bridge_add(dev, panel);
+ if (IS_ERR(dsi->next_bridge)) {
+ ret = PTR_ERR(dsi->next_bridge);
+ goto err_unregister_host;
+ }
+ }
+
dsi->driver_data = of_device_get_match_data(dev);

dsi->engine_clk = devm_clk_get(dev, "engine");
--
2.27.0