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Commit 82c22cba authored by raghavendra ambadas's avatar raghavendra ambadas
Browse files

msm: mdss: Add sysfs node for histogram notification 



Add support for histogram notification to userspace
using sysfs node for mdp3 driver. Change adds a
histogram sysfs node for each framebuffer which will be
utilized to notify the clients.

Change-Id: I4203378f79bf7286eb40e76b269a471deed08478
Signed-off-by: default avatarRaghavendra Ambadas <rambad@codeaurora.org>
parent 30f04fcf

drivers/video/msm/mdss/mdp3_ctrl.c

+35 −0
Original line number Diff line number Diff line
@@ -247,6 +247,13 @@ static void mdp3_vsync_retire_work_handler(struct work_struct *work) 
	mdp3_vsync_retire_signal(mdp3_session->mfd, 1);

}



void mdp3_hist_intr_notify(struct mdp3_dma *dma)

{

	dma->hist_events++;

	sysfs_notify_dirent(dma->hist_event_sd);

	pr_debug("%s:: hist_events = %u\n", __func__, dma->hist_events);

}



void vsync_notify_handler(void *arg)

{

	struct mdp3_session_data *session = (struct mdp3_session_data *)arg;
@@ -392,6 +399,24 @@ static int mdp3_ctrl_blit_req(struct msm_fb_data_type *mfd, void __user *p) 
	return rc;

}



static ssize_t mdp3_hist_show_event(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct fb_info *fbi = dev_get_drvdata(dev);

	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)fbi->par;

	struct mdp3_session_data *mdp3_session = NULL;

	struct mdp3_dma *dma = NULL;

	int ret;



	if (!mfd || !mfd->mdp.private1)

		return -EAGAIN;



	mdp3_session = (struct mdp3_session_data *)mfd->mdp.private1;

	dma = (struct mdp3_dma *)mdp3_session->dma;

	ret = scnprintf(buf, PAGE_SIZE, "%d\n", dma->hist_events);

	return ret;

}



static ssize_t mdp3_vsync_show_event(struct device *dev,

		struct device_attribute *attr, char *buf)

{
@@ -479,6 +504,7 @@ static ssize_t mdp3_dyn_pu_store(struct device *dev, 
	return count;

}



static DEVICE_ATTR(hist_event, S_IRUGO, mdp3_hist_show_event, NULL);

static DEVICE_ATTR(vsync_event, S_IRUGO, mdp3_vsync_show_event, NULL);

static DEVICE_ATTR(packpattern, S_IRUGO, mdp3_packpattern_show, NULL);

static DEVICE_ATTR(dyn_pu, S_IRUGO | S_IWUSR | S_IWGRP, mdp3_dyn_pu_show,
@@ -487,6 +513,7 @@ static DEVICE_ATTR(dyn_pu, S_IRUGO | S_IWUSR | S_IWGRP, mdp3_dyn_pu_show, 
static struct attribute *generic_attrs[] = {

	&dev_attr_packpattern.attr,

	&dev_attr_dyn_pu.attr,

	&dev_attr_hist_event.attr,

	NULL,

};
@@ -2879,6 +2906,14 @@ int mdp3_ctrl_init(struct msm_fb_data_type *mfd) 
		goto init_done;

	}



	mdp3_session->dma->hist_event_sd = sysfs_get_dirent(dev->kobj.sd,

							"hist_event");

	if (!mdp3_session->dma->hist_event_sd) {

		pr_err("hist_event sysfs lookup failed\n");

		rc = -ENODEV;

		goto init_done;

	}



	rc = mdp3_create_sysfs_link(dev);

	if (rc)

		pr_warn("problem creating link to mdp sysfs\n");

drivers/video/msm/mdss/mdp3_dma.c

+2 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2013-2014, 2016, The Linux Foundation. All rights reserved.

 *

 * Copyright (c) 2017, The Linux Foundation. All rights reserved.

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.
@@ -90,6 +90,7 @@ static void mdp3_hist_done_intr_handler(int type, void *arg) 
		dma->histo_state = MDP3_DMA_HISTO_STATE_READY;

		complete(&dma->histo_comp);

		spin_unlock(&dma->histo_lock);

		mdp3_hist_intr_notify(dma);

	}

	if (isr & MDP3_DMA_P_HIST_INTR_RESET_DONE_BIT) {

		spin_lock(&dma->histo_lock);

drivers/video/msm/mdss/mdp3_dma.h

+4 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2013-2014, 2016, The Linux Foundation. All rights reserved.

 *

 * Copyright (c) 2017, The Linux Foundation. All rights reserved.

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.
@@ -261,6 +261,7 @@ struct mdp3_dma { 
	struct completion vsync_comp;

	struct completion dma_comp;

	struct completion histo_comp;

	struct kernfs_node *hist_event_sd;

	struct mdp3_notification vsync_client;

	struct mdp3_notification dma_notifier_client;

	struct mdp3_notification retire_client;
@@ -286,6 +287,7 @@ struct mdp3_dma { 
	struct mdp3_rect roi;



	u32 lut_sts;

	u32 hist_events;

	struct fb_cmap *gc_cmap;

	struct fb_cmap *hist_cmap;
@@ -390,4 +392,5 @@ void mdp3_dma_callback_enable(struct mdp3_dma *dma, int type); 


void mdp3_dma_callback_disable(struct mdp3_dma *dma, int type);



void mdp3_hist_intr_notify(struct mdp3_dma *dma);

#endif /* MDP3_DMA_H */