From: Anson Huang <Anson.Huang@nxp.com>
Date: Fri, 20 Oct 2017 15:52:41 +0000 (+0800)
Subject: MLK-16676-3 soc: imx: pm-domains: add debug console power management
X-Git-Tag: C0P2-H0.0--20200415~1280
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=1fd29d4256edbdb33dc28e21f24a2a2465daaa5b;p=linux.git

MLK-16676-3 soc: imx: pm-domains: add debug console power management

On i.MX8QM/i.MX8QXP, when "no_console_suspend" is added,
need to keep debug uart power on for debug message output,
support this case by reading debug uart resource from
dtb and checking console suspend settings.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---

diff --git a/drivers/soc/imx/pm-domains.c b/drivers/soc/imx/pm-domains.c
index a3bd4f2a30f5..2c9c90c37da2 100644
--- a/drivers/soc/imx/pm-domains.c
+++ b/drivers/soc/imx/pm-domains.c
@@ -37,6 +37,7 @@ static sc_rsrc_t early_power_on_rsrc[] = {
 	SC_R_LAST, SC_R_LAST, SC_R_LAST, SC_R_LAST, SC_R_LAST,
 	SC_R_LAST, SC_R_LAST, SC_R_LAST, SC_R_LAST, SC_R_LAST,
 };
+static sc_rsrc_t rsrc_debug_console;
 
 static int imx8_pd_power(struct generic_pm_domain *domain, bool power_on)
 {
@@ -48,6 +49,11 @@ static int imx8_pd_power(struct generic_pm_domain *domain, bool power_on)
 	if (pd->rsrc_id == SC_R_LAST)
 		return 0;
 
+	/* keep uart console power on for no_console_suspend */
+	if (pd->rsrc_id == rsrc_debug_console &&
+		!console_suspend_enabled && !power_on)
+		return 0;
+
 	sci_err = sc_pm_set_resource_power_mode(pm_ipc_handle, pd->rsrc_id,
 		(power_on) ? SC_PM_PW_MODE_ON :
 		(pd->runtime_idle_active) ? SC_PM_PW_MODE_LP : SC_PM_PW_MODE_OFF);
@@ -266,6 +272,8 @@ static int __init imx8_add_pm_domains(struct device_node *parent,
 				sizeof(sc_rsrc_t))) {
 				early_power_on_rsrc[index++] = imx8_pd->rsrc_id;
 			}
+			if (of_property_read_bool(np, "debug_console"))
+				rsrc_debug_console = imx8_pd->rsrc_id;
 		}
 		INIT_LIST_HEAD(&imx8_pd->clks);
 		pm_genpd_init(&imx8_pd->pd, NULL, true);