ARM: OMAP2+: Avoid idling memory controllers with no drivers

Memory controllers in OMAP (like GPMC and EMIF) have the hwmods marked with
HWMOD_INIT_NO_IDLE and are left in enabled state post initial setup.

Even if they have drivers missing, avoid idling them as part of
omap_device_late_idle()

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Tested-by: Mark Jackson <mpfj-list@newflow.co.uk>
Signed-off-by: Paul Walmsley <paul@pwsan.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
index 5cc92874be7e..1c82cdedd358 100644
--- a/arch/arm/mach-omap2/omap_device.c
+++ b/arch/arm/mach-omap2/omap_device.c
@@ -842,6 +842,7 @@ static int __init omap_device_late_idle(struct device *dev, void *data)
 {
         struct platform_device *pdev = to_platform_device(dev);
         struct omap_device *od = to_omap_device(pdev);
+        int i;
 
         if (!od)
                 return 0;
@@ -850,6 +851,15 @@ static int __init omap_device_late_idle(struct device *dev, void *data)
          * If omap_device state is enabled, but has no driver bound,
          * idle it.
          */
+
+        /*
+         * Some devices (like memory controllers) are always kept
+         * enabled, and should not be idled even with no drivers.
+         */
+        for (i = 0; i < od->hwmods_cnt; i++)
+                if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
+                        return 0;
+
         if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) {
                 if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
                         dev_warn(dev, "%s: enabled but no driver.  Idling\n",