Re: [PATCH v6 4/6] drm: exynos: dsi: Use drm panel_bridge API

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On 03.03.2022 17:36, Jagan Teki wrote:
> Replace the manual panel handling code by a drm panel_bridge via
> devm_drm_of_get_bridge().
>
> Adding panel_bridge handling,
>
> - Drops drm_connector and related operations as drm_bridge_attach
>    creates connector during attachment.
>
> - Drops panel pointer and iterate the bridge, so-that it can operate
>    the normal bridge and panel_bridge in constitutive callbacks.
>
> This simplifies the driver and allows all components in the display
> pipeline to be treated as bridges.
>
> Signed-off-by: Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx>

Acked-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>

Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>

> ---
> Changes for v6, v5:
> - none
> Changes for v4:
> - drop unneeded headers
> Changes for v3:
> - fix port number
> - add print for attached device
> Changes for v2:
> - new patch
>
>   drivers/gpu/drm/exynos/exynos_drm_dsi.c | 157 ++++--------------------
>   1 file changed, 23 insertions(+), 134 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> index 741c046513e8..953094133ed8 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> @@ -24,9 +24,7 @@
>   
>   #include <drm/drm_atomic_helper.h>
>   #include <drm/drm_bridge.h>
> -#include <drm/drm_fb_helper.h>
>   #include <drm/drm_mipi_dsi.h>
> -#include <drm/drm_panel.h>
>   #include <drm/drm_print.h>
>   #include <drm/drm_probe_helper.h>
>   #include <drm/drm_simple_kms_helper.h>
> @@ -253,8 +251,6 @@ struct exynos_dsi_driver_data {
>   struct exynos_dsi {
>   	struct drm_encoder encoder;
>   	struct mipi_dsi_host dsi_host;
> -	struct drm_connector connector;
> -	struct drm_panel *panel;
>   	struct list_head bridge_chain;
>   	struct drm_bridge *out_bridge;
>   	struct device *dev;
> @@ -285,7 +281,6 @@ 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)
>   {
> @@ -1380,42 +1375,21 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
>   
>   	dsi->state |= DSIM_STATE_ENABLED;
>   
> -	if (dsi->panel) {
> -		ret = drm_panel_prepare(dsi->panel);
> -		if (ret < 0)
> -			goto err_put_sync;
> -	} else {
> -		list_for_each_entry_reverse(iter, &dsi->bridge_chain,
> -					    chain_node) {
> -			if (iter->funcs->pre_enable)
> -				iter->funcs->pre_enable(iter);
> -		}
> +	list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
> +		if (iter->funcs->pre_enable)
> +			iter->funcs->pre_enable(iter);
>   	}
>   
>   	exynos_dsi_set_display_mode(dsi);
>   	exynos_dsi_set_display_enable(dsi, true);
>   
> -	if (dsi->panel) {
> -		ret = drm_panel_enable(dsi->panel);
> -		if (ret < 0)
> -			goto err_display_disable;
> -	} else {
> -		list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
> -			if (iter->funcs->enable)
> -				iter->funcs->enable(iter);
> -		}
> +	list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
> +		if (iter->funcs->enable)
> +			iter->funcs->enable(iter);
>   	}
>   
>   	dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
>   	return;
> -
> -err_display_disable:
> -	exynos_dsi_set_display_enable(dsi, false);
> -	drm_panel_unprepare(dsi->panel);
> -
> -err_put_sync:
> -	dsi->state &= ~DSIM_STATE_ENABLED;
> -	pm_runtime_put(dsi->dev);
>   }
>   
>   static void exynos_dsi_disable(struct drm_encoder *encoder)
> @@ -1428,15 +1402,12 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
>   
>   	dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE;
>   
> -	drm_panel_disable(dsi->panel);
> -
>   	list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
>   		if (iter->funcs->disable)
>   			iter->funcs->disable(iter);
>   	}
>   
>   	exynos_dsi_set_display_enable(dsi, false);
> -	drm_panel_unprepare(dsi->panel);
>   
>   	list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
>   		if (iter->funcs->post_disable)
> @@ -1456,70 +1427,6 @@ static void exynos_dsi_mode_set(struct drm_encoder *encoder,
>   	drm_mode_copy(&dsi->mode, adjusted_mode);
>   }
>   
> -static enum drm_connector_status
> -exynos_dsi_detect(struct drm_connector *connector, bool force)
> -{
> -	return connector->status;
> -}
> -
> -static void exynos_dsi_connector_destroy(struct drm_connector *connector)
> -{
> -	drm_connector_unregister(connector);
> -	drm_connector_cleanup(connector);
> -	connector->dev = NULL;
> -}
> -
> -static const struct drm_connector_funcs exynos_dsi_connector_funcs = {
> -	.detect = exynos_dsi_detect,
> -	.fill_modes = drm_helper_probe_single_connector_modes,
> -	.destroy = exynos_dsi_connector_destroy,
> -	.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 int exynos_dsi_get_modes(struct drm_connector *connector)
> -{
> -	struct exynos_dsi *dsi = connector_to_dsi(connector);
> -
> -	if (dsi->panel)
> -		return drm_panel_get_modes(dsi->panel, connector);
> -
> -	return 0;
> -}
> -
> -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)
> -{
> -	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
> -	struct drm_connector *connector = &dsi->connector;
> -	struct drm_device *drm = encoder->dev;
> -	int ret;
> -
> -	connector->polled = DRM_CONNECTOR_POLL_HPD;
> -
> -	ret = drm_connector_init(drm, connector, &exynos_dsi_connector_funcs,
> -				 DRM_MODE_CONNECTOR_DSI);
> -	if (ret) {
> -		DRM_DEV_ERROR(dsi->dev,
> -			      "Failed to initialize connector with drm\n");
> -		return ret;
> -	}
> -
> -	connector->status = connector_status_disconnected;
> -	drm_connector_helper_add(connector, &exynos_dsi_connector_helper_funcs);
> -	drm_connector_attach_encoder(connector, encoder);
> -	if (!drm->registered)
> -		return 0;
> -
> -	connector->funcs->reset(connector);
> -	drm_connector_register(connector);
> -	return 0;
> -}
> -
>   static const struct drm_encoder_helper_funcs exynos_dsi_encoder_helper_funcs = {
>   	.enable = exynos_dsi_enable,
>   	.disable = exynos_dsi_disable,
> @@ -1532,33 +1439,23 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
>   				  struct mipi_dsi_device *device)
>   {
>   	struct exynos_dsi *dsi = host_to_dsi(host);
> +	struct device *dev = dsi->dev;
>   	struct drm_encoder *encoder = &dsi->encoder;
>   	struct drm_device *drm = encoder->dev;
> -	struct drm_bridge *out_bridge;
> -
> -	out_bridge  = of_drm_find_bridge(device->dev.of_node);
> -	if (out_bridge) {
> -		drm_bridge_attach(encoder, out_bridge, NULL, 0);
> -		dsi->out_bridge = out_bridge;
> -		list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
> -	} else {
> -		int ret = exynos_dsi_create_connector(encoder);
> -
> -		if (ret) {
> -			DRM_DEV_ERROR(dsi->dev,
> -				      "failed to create connector ret = %d\n",
> -				      ret);
> -			drm_encoder_cleanup(encoder);
> -			return ret;
> -		}
> +	int ret;
>   
> -		dsi->panel = of_drm_find_panel(device->dev.of_node);
> -		if (IS_ERR(dsi->panel))
> -			dsi->panel = NULL;
> -		else
> -			dsi->connector.status = connector_status_connected;
> +	dsi->out_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
> +	if (IS_ERR(dsi->out_bridge)) {
> +		ret = PTR_ERR(dsi->out_bridge);
> +		DRM_DEV_ERROR(dev, "failed to find the bridge: %d\n", ret);
> +		return ret;
>   	}
>   
> +	DRM_DEV_INFO(dev, "Attached %s device\n", device->name);
> +
> +	drm_bridge_attach(encoder, dsi->out_bridge, NULL, 0);
> +	list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
> +
>   	/*
>   	 * This is a temporary solution and should be made by more generic way.
>   	 *
> @@ -1566,7 +1463,7 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
>   	 * TE interrupt handler.
>   	 */
>   	if (!(device->mode_flags & MIPI_DSI_MODE_VIDEO)) {
> -		int ret = exynos_dsi_register_te_irq(dsi, &device->dev);
> +		ret = exynos_dsi_register_te_irq(dsi, &device->dev);
>   		if (ret)
>   			return ret;
>   	}
> @@ -1593,18 +1490,10 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
>   	struct exynos_dsi *dsi = host_to_dsi(host);
>   	struct drm_device *drm = dsi->encoder.dev;
>   
> -	if (dsi->panel) {
> -		mutex_lock(&drm->mode_config.mutex);
> -		exynos_dsi_disable(&dsi->encoder);
> -		dsi->panel = NULL;
> -		dsi->connector.status = connector_status_disconnected;
> -		mutex_unlock(&drm->mode_config.mutex);
> -	} else {
> -		if (dsi->out_bridge->funcs->detach)
> -			dsi->out_bridge->funcs->detach(dsi->out_bridge);
> -		dsi->out_bridge = NULL;
> -		INIT_LIST_HEAD(&dsi->bridge_chain);
> -	}
> +	if (dsi->out_bridge->funcs->detach)
> +		dsi->out_bridge->funcs->detach(dsi->out_bridge);
> +	dsi->out_bridge = NULL;
> +	INIT_LIST_HEAD(&dsi->bridge_chain);
>   
>   	if (drm->mode_config.poll_enabled)
>   		drm_kms_helper_hotplug_event(drm);

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland




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