ARM: OMAP2+: hwmod: Add a new flag to handle SIDLE in SWSUP only in active

Some IPs (like UART) need the sidle mode to be controlled in SW only
while they are active. Once they go inactive, they need the IP to be
put back in HW control so they are also wakeup capable.

The flag HWMOD_SWSUP_SIDLE takes care of IPs which need the sidle
mode to be *always* controlled in SWSUP. We now have a need to control
IPs sidle mode in SWSUP only while its active.

So define a new flag 'HWMOD_SWSUP_SIDLE_ACT' to help the framework
know about these new IP requirements.

Tested-by: Vaibhav Bedia <vaibhav.bedia@ti.com>
Tested-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>  # OMAP4/Panda
Signed-off-by: Paul Walmsley <paul@pwsan.com>

arch/arm/mach-omap2/omap_hwmod.c

@@ -1356,7 +1356,8 @@ static void _enable_sysc(struct omap_hwmod *oh)
 
 	clkdm = _get_clkdm(oh);
 	if (sf & SYSC_HAS_SIDLEMODE) {
-		if (oh->flags & HWMOD_SWSUP_SIDLE) {
+		if (oh->flags & HWMOD_SWSUP_SIDLE ||
+		    oh->flags & HWMOD_SWSUP_SIDLE_ACT) {
 			idlemode = HWMOD_IDLEMODE_NO;
 		} else {
 			if (sf & SYSC_HAS_ENAWAKEUP)

arch/arm/mach-omap2/omap_hwmod.h

@@ -463,6 +463,9 @@ struct omap_hwmod_omap4_prcm {
  *     is kept in force-standby mode. Failing to do so causes PM problems
  *     with musb on OMAP3630 at least. Note that musb has a dedicated register
  *     to control MSTANDBY signal when MIDLEMODE is set to force-standby.
+ * HWMOD_SWSUP_SIDLE_ACT: omap_hwmod code should manually bring the module
+ *     out of idle, but rely on smart-idle to the put it back in idle,
+ *     so the wakeups are still functional (Only known case for now is UART)
  */
 #define HWMOD_SWSUP_SIDLE			(1 << 0)
 #define HWMOD_SWSUP_MSTANDBY			(1 << 1)
@@ -476,6 +479,7 @@ struct omap_hwmod_omap4_prcm {
 #define HWMOD_EXT_OPT_MAIN_CLK			(1 << 9)
 #define HWMOD_BLOCK_WFI				(1 << 10)
 #define HWMOD_FORCE_MSTANDBY			(1 << 11)
+#define HWMOD_SWSUP_SIDLE_ACT			(1 << 12)
 
 /*
  * omap_hwmod._int_flags definitions