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>

diff --git a/arch/arm/mach-omap2/omap_device.c b/arch/arm/mach-omap2/omap_device.c
index 5cc92874be7e6f22d81767c0f75e141376ab83d6..1c82cdedd358c40410bad0a6bec6d60afc3b0c5e 100644 (file)
--- 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",