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Commit 0aedc43f authored by Tatenda Chipeperekwa's avatar Tatenda Chipeperekwa Committed by Abhinav Kumar
Browse files

drm: msm: add support for a custom hotplug event 



Add support for a custom hotplug event that is triggered when the
status of the connector has changed. The event string of the
custom event will be in the following format:
	"name=<connector name> status=<connector status>"
For example, when the DisplayPort connector has its status
updated to connected then the event string that is used as part
of the hotplug event will be as follows:
	"name=DP-1 status=connected"
If the connector name is not known or is invalid at the time that
the event is triggered then the name will be reported as "unknown".

Change-Id: I5d6164d1e8e651cb05527733d68fa86fefb9e6ce
Signed-off-by: default avatarTatenda Chipeperekwa <tatendac@codeaurora.org>
Signed-off-by: default avatarAbhinav Kumar <abhinavk@codeaurora.org>
parent 17ca958b

drivers/gpu/drm/msm/msm_drv.c

+58 −1
Original line number Diff line number Diff line
@@ -26,11 +26,68 @@ 
#include "msm_gem.h"

#include "msm_mmu.h"



static void msm_drm_helper_hotplug_event(struct drm_device *dev)

{

	struct drm_connector *connector;

	char *event_string;

	char const *connector_name;

	char *envp[2];



	if (!dev) {

		DRM_ERROR("hotplug_event failed, invalid input\n");

		return;

	}



	if (!dev->mode_config.poll_enabled)

		return;



	event_string = kzalloc(SZ_4K, GFP_KERNEL);

	if (!event_string) {

		DRM_ERROR("failed to allocate event string\n");

		return;

	}



	mutex_lock(&dev->mode_config.mutex);

	drm_for_each_connector(connector, dev) {

		/* Only handle HPD capable connectors. */

		if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))

			continue;



		connector->status = connector->funcs->detect(connector, false);



		if (connector->name)

			connector_name = connector->name;

		else

			connector_name = "unknown";



		snprintf(event_string, SZ_4K, "name=%s status=%s\n",

			connector_name,

			drm_get_connector_status_name(connector->status));

		DRM_DEBUG("generating hotplug event [%s]\n", event_string);

		envp[0] = event_string;

		envp[1] = NULL;

		kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE,

				envp);

	}

	mutex_unlock(&dev->mode_config.mutex);

	kfree(event_string);

}



static void msm_fb_output_poll_changed(struct drm_device *dev)

{

	struct msm_drm_private *priv = dev->dev_private;

	struct msm_drm_private *priv = NULL;



	if (!dev) {

		DRM_ERROR("output_poll_changed failed, invalid input\n");

		return;

	}



	priv = dev->dev_private;



	if (priv->fbdev)

		drm_fb_helper_hotplug_event(priv->fbdev);

	else

		msm_drm_helper_hotplug_event(dev);

}



static const struct drm_mode_config_funcs mode_config_funcs = {