bus: ti-sysc: Handle swsup idle mode quirks

Some modules have idlemodes wired, but not completely functional. We have
quirks for SWSUP_SIDLE and SWSUP_SIDLE_ACT to manage interconnect target
modules without hardware support, but we've been only using them so far
in legacy mode. Let's add support for SWSUP quirks in non-legacy mode too.
Tested-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/bus/ti-sysc.c

@@ -886,10 +886,15 @@ static int sysc_enable_module(struct device *dev)
 	if (!idlemodes || regbits->sidle_shift < 0)
 		goto set_midle;
 
-	best_mode = fls(ddata->cfg.sidlemodes) - 1;
-	if (best_mode > SYSC_IDLE_MASK) {
-		dev_err(dev, "%s: invalid sidlemode\n", __func__);
-		return -EINVAL;
+	if (ddata->cfg.quirks & (SYSC_QUIRK_SWSUP_SIDLE |
+				 SYSC_QUIRK_SWSUP_SIDLE_ACT)) {
+		best_mode = SYSC_IDLE_NO;
+	} else {
+		best_mode = fls(ddata->cfg.sidlemodes) - 1;
+		if (best_mode > SYSC_IDLE_MASK) {
+			dev_err(dev, "%s: invalid sidlemode\n", __func__);
+			return -EINVAL;
+		}
 	}
 
 	reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift);
@@ -973,10 +978,14 @@ static int sysc_disable_module(struct device *dev)
 	if (!idlemodes || regbits->sidle_shift < 0)
 		return 0;
 
-	ret = sysc_best_idle_mode(idlemodes, &best_mode);
-	if (ret) {
-		dev_err(dev, "%s: invalid sidlemode\n", __func__);
-		return ret;
+	if (ddata->cfg.quirks & SYSC_QUIRK_SWSUP_SIDLE) {
+		best_mode = SYSC_IDLE_FORCE;
+	} else {
+		ret = sysc_best_idle_mode(idlemodes, &best_mode);
+		if (ret) {
+			dev_err(dev, "%s: invalid sidlemode\n", __func__);
+			return ret;
+		}
 	}
 
 	reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift);