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Commit 458da918 authored by Shubham Talekar's avatar Shubham Talekar
Browse files

drm/dp: via debugfs entry node perform power transition 



The change will make a debugfs entry into
/sys/kernel/debug/drm_dp/dpms_mode.
echo 1: normal mode
echo 2: power down mode
echo 5: power down mode with AUX block fully powered.

Change-Id: I7b04e4884ad0fdb531f94b5d5cabf6578c0c39e2
Signed-off-by: default avatarShubham Talekar <quic_stalekar@quicinc.com>
parent f047d796

drivers/gpu/drm/msm/dp/dp_debug.c

+99 −2
Original line number Diff line number Diff line
@@ -25,6 +25,8 @@ 
#include "sde_connector.h"

#include "dp_display.h"



#include <drm/drm_dp_helper.h>



#define DEBUG_NAME "drm_dp"



struct dp_debug_private {
@@ -50,6 +52,13 @@ struct dp_debug_private { 
	struct work_struct sim_work;

	struct dp_debug dp_debug;

	struct mutex lock;

	struct dp_ctrl *ctrl;

};



enum dpms_mode_status {

	DRM_DPMS_ON = 1,

	DRM_DPMS_OFF = 2,

	DRM_DPMS_SUSPEND = 5,

};



static int dp_debug_get_edid_buf(struct dp_debug_private *debug)
@@ -985,6 +994,77 @@ static ssize_t dp_debug_write_attention(struct file *file, 
	return len;

}



static ssize_t dp_debug_write_dpms(struct file *file,

	const char __user *user_buff, size_t count, loff_t *ppos)

{

	int dpms_mode;

	struct dp_debug_private *debug = file->private_data;

	char buf[SZ_8];

	size_t len = 0;

	enum dpms_mode_status mode_status;



	len = min_t(size_t, count, SZ_8-1);

	if (copy_from_user(buf, user_buff, len))

		goto end;



	buf[len] = '\0';



	if (kstrtoint(buf, 8, &dpms_mode)) {

		pr_err("offset kstrtoint error\n");

		return 0;

	}



	if (!debug->aux || !debug->aux->drm_aux || !debug->panel)

		return 0;



	pr_info("dpms_mode = %d", dpms_mode);

	mode_status = dpms_mode;

	switch (mode_status) {

	case DRM_DPMS_ON:

		drm_dp_link_power_up(debug->aux->drm_aux,

				&debug->panel->link_info);

		debug->ctrl->link_maintenance(debug->ctrl);

		break;

	case DRM_DPMS_OFF:

		drm_dp_link_power_down(debug->aux->drm_aux,

				&debug->panel->link_info);

		break;

	case DRM_DPMS_SUSPEND:

		drm_dp_link_power_down_aux_up(debug->aux->drm_aux,

				&debug->panel->link_info);

		break;

	default:

		pr_err("Invalid values\n");

	}

end:

	return count;

}



static ssize_t dp_debug_read_dpms(struct file *file,

			char __user *user_buff, size_t count, loff_t *ppos)

{

	u8 value;

	int err, len;

	char buf[SZ_8];

	struct dp_debug_private *debug = file->private_data;



	err = drm_dp_dpcd_readb(debug->aux->drm_aux, DP_SET_POWER, &value);

	if (err < 0)

		return err;



	if (*ppos)

		return 0;



	len += snprintf(buf, SZ_8, "%d\n", value);



	len = min_t(size_t, count, len);

	if (copy_to_user(user_buff, buf, len))

		return -EFAULT;



	*ppos += len;

	return len;

}



static ssize_t dp_debug_write_dump(struct file *file,

		const char __user *user_buff, size_t count, loff_t *ppos)

{
@@ -1121,6 +1201,12 @@ static const struct file_operations dump_fops = { 
	.read = dp_debug_read_dump,

};



static const struct file_operations dpms_mode_fops = {

	.open = simple_open,

	.write = dp_debug_write_dpms,

	.read = dp_debug_read_dpms,

};



static int dp_debug_init(struct dp_debug *dp_debug)

{

	int rc = 0;
@@ -1260,6 +1346,16 @@ static int dp_debug_init(struct dp_debug *dp_debug) 
		goto error_remove_dir;

	}



	file = debugfs_create_file("dpms_mode", 0644, dir,

		debug, &dpms_mode_fops);



	if (IS_ERR_OR_NULL(file)) {

		rc = PTR_ERR(file);

		pr_err("[%s] debugfs dpms failed, rc=%d\n",

			DEBUG_NAME, rc);

		goto error_remove_dir;

	}



	return 0;



error_remove_dir:
@@ -1281,13 +1377,13 @@ static void dp_debug_sim_work(struct work_struct *work) 
struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,

			struct dp_usbpd *usbpd, struct dp_link *link,

			struct dp_aux *aux, struct drm_connector **connector,

			struct dp_catalog *catalog)

			struct dp_catalog *catalog, struct dp_ctrl *ctrl)

{

	int rc = 0;

	struct dp_debug_private *debug;

	struct dp_debug *dp_debug;



	if (!dev || !panel || !usbpd || !link || !catalog) {

	if (!dev || !panel || !usbpd || !link || !catalog || !ctrl) {

		pr_err("invalid input\n");

		rc = -EINVAL;

		goto error;
@@ -1309,6 +1405,7 @@ struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel, 
	debug->dev = dev;

	debug->connector = connector;

	debug->catalog = catalog;

	debug->ctrl = ctrl;



	dp_debug = &debug->dp_debug;

	dp_debug->vdisplay = 0;

drivers/gpu/drm/msm/dp/dp_debug.h

+2 −1
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include "dp_link.h"

#include "dp_usbpd.h"

#include "dp_aux.h"

#include "dp_ctrl.h"



/**

 * struct dp_debug
@@ -56,7 +57,7 @@ struct dp_debug { 
struct dp_debug *dp_debug_get(struct device *dev, struct dp_panel *panel,

			struct dp_usbpd *usbpd, struct dp_link *link,

			struct dp_aux *aux, struct drm_connector **connector,

			struct dp_catalog *catalog);

			struct dp_catalog *catalog, struct dp_ctrl *ctrl);

/**

 * dp_debug_put()

 *

drivers/gpu/drm/msm/dp/dp_display.c

+1 −1
Original line number Diff line number Diff line
@@ -977,7 +977,7 @@ static int dp_init_sub_modules(struct dp_display_private *dp) 


	dp->debug = dp_debug_get(dev, dp->panel, dp->usbpd,

				dp->link, dp->aux, &dp->dp_display.connector,

				dp->catalog);

				dp->catalog, dp->ctrl);

	if (IS_ERR(dp->debug)) {

		rc = PTR_ERR(dp->debug);

		pr_err("failed to initialize debug, rc = %d\n", rc);