msm: dsi: Turn off supplies in low power state

This change allows certain phy supplies to be turned off
when display transtions to low power state. This change
adds funtionality to check each supplies setting and
accordingly turns off the the regulator if it is
allowed in low power state.

CRs-Fixed: 2009863
Change-Id: I764a8e65246b5de733f27e4f73d966b19039895d
Signed-off-by: Abhijit Kulkarni <kabhijit@codeaurora.org>

Documentation/devicetree/bindings/fb/mdss-dsi.txt

@@ -50,6 +50,8 @@ Optional properties:
 					-- qcom,supply-post-on-sleep: time to sleep (ms) after turning on
 					-- qcom,supply-pre-off-sleep: time to sleep (ms) before turning off
 					-- qcom,supply-post-off-sleep: time to sleep (ms) after turning off
+					-- qcom,supply-lp-mode-disable-allowed: supply can be turned off in
+					low power state.
 - pll-src-config			Specified the source PLL for the DSI
 					link clocks:
 					"PLL0" - Clocks sourced out of DSI PLL0

drivers/video/fbdev/msm/mdss_dsi.c

@@ -570,7 +570,11 @@ static int mdss_dsi_get_dt_vreg_data(struct device *dev,
 			mp->vreg_config[i].post_off_sleep = tmp;
 		}
 
-		pr_debug("%s: %s min=%d, max=%d, enable=%d, disable=%d, preonsleep=%d, postonsleep=%d, preoffsleep=%d, postoffsleep=%d\n",
+		mp->vreg_config[i].lp_disable_allowed =
+			of_property_read_bool(supply_node,
+			"qcom,supply-lp-mode-disable-allowed");
+
+		pr_debug("%s: %s min=%d, max=%d, enable=%d, disable=%d, preonsleep=%d, postonsleep=%d, preoffsleep=%d, postoffsleep=%d lp_disable_allowed=%d\n",
 			__func__,
 			mp->vreg_config[i].vreg_name,
 			mp->vreg_config[i].min_voltage,
@@ -580,8 +584,8 @@ static int mdss_dsi_get_dt_vreg_data(struct device *dev,
 			mp->vreg_config[i].pre_on_sleep,
 			mp->vreg_config[i].post_on_sleep,
 			mp->vreg_config[i].pre_off_sleep,
-			mp->vreg_config[i].post_off_sleep
-			);
+			mp->vreg_config[i].post_off_sleep,
+			mp->vreg_config[i].lp_disable_allowed);
 		++i;
 	}
 

drivers/video/fbdev/msm/msm_mdss_io_8974.c

@@ -2419,9 +2419,16 @@ int mdss_dsi_post_clkoff_cb(void *priv,
 		pdata = &ctrl->panel_data;
 
 		for (i = DSI_MAX_PM - 1; i >= DSI_CORE_PM; i--) {
-			if ((ctrl->ctrl_state & CTRL_STATE_DSI_ACTIVE) &&
-				(i != DSI_CORE_PM))
-				continue;
+			/**
+			 * If DSI_CTRL is active, proceed to turn off
+			 * supplies which support turning off in low power
+			 * state
+			 */
+			if (ctrl->ctrl_state & CTRL_STATE_DSI_ACTIVE)
+				if (!sdata->power_data[i].vreg_config
+						->lp_disable_allowed)
+					continue;
+
 			rc = msm_dss_enable_vreg(
 				sdata->power_data[i].vreg_config,
 				sdata->power_data[i].num_vreg, 0);
@@ -2431,6 +2438,12 @@ int mdss_dsi_post_clkoff_cb(void *priv,
 					__mdss_dsi_pm_name(i));
 				rc = 0;
 			} else {
+				pr_debug("%s: disabled vreg for %s panel_state %d\n",
+					__func__,
+					__mdss_dsi_pm_name(i),
+					pdata->panel_info.panel_power_state);
+				sdata->power_data[i].vreg_config->disabled =
+					true;
 				ctrl->core_power = false;
 			}
 		}
@@ -2470,7 +2483,7 @@ int mdss_dsi_pre_clkon_cb(void *priv,
 		for (i = DSI_CORE_PM; i < DSI_MAX_PM; i++) {
 			if ((ctrl->ctrl_state & CTRL_STATE_DSI_ACTIVE) &&
 				(!pdata->panel_info.cont_splash_enabled) &&
-				(i != DSI_CORE_PM))
+				(!sdata->power_data[i].vreg_config->disabled))
 				continue;
 			rc = msm_dss_enable_vreg(
 				sdata->power_data[i].vreg_config,
@@ -2480,6 +2493,11 @@ int mdss_dsi_pre_clkon_cb(void *priv,
 					__func__,
 					__mdss_dsi_pm_name(i));
 			} else {
+				pr_debug("%s: enabled vregs for %s\n",
+					__func__,
+					__mdss_dsi_pm_name(i));
+				sdata->power_data[i].vreg_config->disabled =
+					false;
 				ctrl->core_power = true;
 			}
 

include/linux/mdss_io_util.h

@@ -1,4 +1,4 @@
-/* Copyright (c) 2012, 2016, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2012, 2016-2017, 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
@@ -58,6 +58,8 @@ struct dss_vreg {
 	int post_on_sleep;
 	int pre_off_sleep;
 	int post_off_sleep;
+	bool lp_disable_allowed;
+	bool disabled;
 };
 
 struct dss_gpio {