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>

2 files changed, 29 insertions, 7 deletions

diff --git a/drivers/video/fbdev/msm/mdss_dsi.c b/drivers/video/fbdev/msm/mdss_dsi.c
index 17722eac3006..dbf302d76d7b 100644
--- a/drivers/video/fbdev/msm/mdss_dsi.c
+++ b/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;
 	}
 
diff --git a/drivers/video/fbdev/msm/msm_mdss_io_8974.c b/drivers/video/fbdev/msm/msm_mdss_io_8974.c
index 03e78733d168..e232d98a7cf7 100644
--- a/drivers/video/fbdev/msm/msm_mdss_io_8974.c
+++ b/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;
 			}