bus: ti-sysc: avoid toggling power state of module during probe

Current implementation for ti-sysc powers down the module once module
init is complete. However, right after power is disabled, it is enabled
via runtime PM. This is unnecessary so avoid it by re-ordering the
events a bit; move powering down of the module post runtime PM enable
which makes sure the use counts are maintained properly and there is
no extra power down/up sequence for the module.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 8cece85..58d72e0 100644 (file)
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -1584,11 +1584,6 @@ static int sysc_reset(struct sysc *ddata)
 static int sysc_init_module(struct sysc *ddata)
 {
        int error = 0;
-       bool manage_clocks = true;
-
-       if (ddata->cfg.quirks &
-           (SYSC_QUIRK_NO_IDLE | SYSC_QUIRK_NO_IDLE_ON_INIT))
-               manage_clocks = false;
 
        error = sysc_clockdomain_init(ddata);
        if (error)
@@ -1621,28 +1616,32 @@ static int sysc_init_module(struct sysc *ddata)
        if (ddata->legacy_mode) {
                error = sysc_legacy_init(ddata);
                if (error)
-                       goto err_main_clocks;
+                       goto err_reset;
        }
 
        if (!ddata->legacy_mode) {
                error = sysc_enable_module(ddata->dev);
                if (error)
-                       goto err_main_clocks;
+                       goto err_reset;
        }
 
        error = sysc_reset(ddata);
        if (error)
                dev_err(ddata->dev, "Reset failed with %d\n", error);
 
-       if (!ddata->legacy_mode && manage_clocks)
+       if (error && !ddata->legacy_mode)
                sysc_disable_module(ddata->dev);
 
+err_reset:
+       if (error && !(ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT))
+               reset_control_assert(ddata->rsts);
+
 err_main_clocks:
-       if (manage_clocks)
+       if (error)
                sysc_disable_main_clocks(ddata);
 err_opt_clocks:
        /* No re-enable of clockdomain autoidle to prevent module autoidle */
-       if (manage_clocks) {
+       if (error) {
                sysc_disable_opt_clocks(ddata);
                sysc_clkdm_allow_idle(ddata);
        }
@@ -2415,10 +2414,17 @@ static int sysc_probe(struct platform_device *pdev)
                goto unprepare;
        }
 
-       /* Balance reset counts */
-       if (ddata->rsts)
+       /* Balance use counts as PM runtime should have enabled these all */
+       if (!(ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT))
                reset_control_assert(ddata->rsts);
 
+       if (!(ddata->cfg.quirks &
+             (SYSC_QUIRK_NO_IDLE | SYSC_QUIRK_NO_IDLE_ON_INIT))) {
+               sysc_disable_main_clocks(ddata);
+               sysc_disable_opt_clocks(ddata);
+               sysc_clkdm_allow_idle(ddata);
+       }
+
        sysc_show_registers(ddata);
 
        ddata->dev->type = &sysc_device_type;