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authorTony Lindgren <tony@atomide.com>2019-03-21 11:00:21 -0700
committerTony Lindgren <tony@atomide.com>2019-04-03 09:32:35 -0700
commitb11c1ea1f636438d4e69381714c73abd9006cdcc (patch)
tree275856cc863b637483f4d9489a2671fe804a4ebc /drivers/bus
parent93de83a21e76eda25517562a9e62f7b6a6f38126 (diff)
downloadlinux-b11c1ea1f636438d4e69381714c73abd9006cdcc.tar.bz2
bus: ti-sysc: Move rstctrl reset to happen later
We can do the rsstctrl a bit later, but need to deassert rstctrl reset before the clocks are enabled if asserted. Let's only init restctrl in sysc_init_resets() and do the reset later on just before we enable the device clocks. Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'drivers/bus')
-rw-r--r--drivers/bus/ti-sysc.c61
1 files changed, 39 insertions, 22 deletions
diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index d4aae997b781..8bf153d82138 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -339,38 +339,18 @@ static void sysc_disable_opt_clocks(struct sysc *ddata)
}
/**
- * sysc_init_resets - reset module on init
+ * sysc_init_resets - init rstctrl reset line if configured
* @ddata: device driver data
*
- * A module can have both OCP softreset control and external rstctrl.
- * If more complicated rstctrl resets are needed, please handle these
- * directly from the child device driver and map only the module reset
- * for the parent interconnect target module device.
- *
- * Automatic reset of the module on init can be skipped with the
- * "ti,no-reset-on-init" device tree property.
+ * See sysc_rstctrl_reset_deassert().
*/
static int sysc_init_resets(struct sysc *ddata)
{
- int error;
-
ddata->rsts =
devm_reset_control_array_get_optional_exclusive(ddata->dev);
if (IS_ERR(ddata->rsts))
return PTR_ERR(ddata->rsts);
- if (ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
- goto deassert;
-
- error = reset_control_assert(ddata->rsts);
- if (error)
- return error;
-
-deassert:
- error = reset_control_deassert(ddata->rsts);
- if (error)
- return error;
-
return 0;
}
@@ -1031,6 +1011,35 @@ static int sysc_legacy_init(struct sysc *ddata)
return error;
}
+/**
+ * sysc_rstctrl_reset_deassert - deassert rstctrl reset
+ * @ddata: device driver data
+ * @reset: reset before deassert
+ *
+ * A module can have both OCP softreset control and external rstctrl.
+ * If more complicated rstctrl resets are needed, please handle these
+ * directly from the child device driver and map only the module reset
+ * for the parent interconnect target module device.
+ *
+ * Automatic reset of the module on init can be skipped with the
+ * "ti,no-reset-on-init" device tree property.
+ */
+static int sysc_rstctrl_reset_deassert(struct sysc *ddata, bool reset)
+{
+ int error;
+
+ if (!ddata->rsts)
+ return 0;
+
+ if (reset) {
+ error = reset_control_assert(ddata->rsts);
+ if (error)
+ return error;
+ }
+
+ return reset_control_deassert(ddata->rsts);
+}
+
static int sysc_reset(struct sysc *ddata)
{
int offset = ddata->offsets[SYSC_SYSCONFIG];
@@ -1071,6 +1080,14 @@ static int sysc_init_module(struct sysc *ddata)
{
int error = 0;
bool manage_clocks = true;
+ bool reset = true;
+
+ if (ddata->cfg.quirks & SYSC_QUIRK_NO_RESET_ON_INIT)
+ reset = false;
+
+ error = sysc_rstctrl_reset_deassert(ddata, reset);
+ if (error)
+ return error;
if (ddata->cfg.quirks &
(SYSC_QUIRK_NO_IDLE | SYSC_QUIRK_NO_IDLE_ON_INIT))