OMAP3: PM: USBHOST: clear wakeup events on both hosts

USBHOST module has 2 fclocks (for HOST1 and HOST2), only one iclock
and only a single bit in the WKST register to indicate a wakeup event.

Because of the single WKST bit, we cannot know whether a wakeup event
was on HOST1 or HOST2, so enable both fclocks before clearing the
wakeup event to ensure both hosts can properly clear the event.

Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index d9440a1..cf6ea9f 100644 (file)
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -63,7 +63,7 @@ static struct powerdomain *mpu_pwrdm;
  */
 static int prcm_clear_mod_irqs(s16 module, u8 regs)
 {
-       u32 wkst, fclk, iclk;
+       u32 wkst, fclk, iclk, clken;
        u16 wkst_off = (regs == 3) ? OMAP3430ES2_PM_WKST3 : PM_WKST1;
        u16 fclk_off = (regs == 3) ? OMAP3430ES2_CM_FCLKEN3 : CM_FCLKEN1;
        u16 iclk_off = (regs == 3) ? CM_ICLKEN3 : CM_ICLKEN1;
@@ -77,8 +77,15 @@ static int prcm_clear_mod_irqs(s16 module, u8 regs)
                iclk = cm_read_mod_reg(module, iclk_off);
                fclk = cm_read_mod_reg(module, fclk_off);
                while (wkst) {
-                       cm_set_mod_reg_bits(wkst, module, iclk_off);
-                       cm_set_mod_reg_bits(wkst, module, fclk_off);
+                       clken = wkst;
+                       cm_set_mod_reg_bits(clken, module, iclk_off);
+                       /*
+                        * For USBHOST, we don't know whether HOST1 or
+                        * HOST2 woke us up, so enable both f-clocks
+                        */
+                       if (module == OMAP3430ES2_USBHOST_MOD)
+                               clken |= 1 << OMAP3430ES2_EN_USBHOST2_SHIFT;
+                       cm_set_mod_reg_bits(clken, module, fclk_off);
                        prm_write_mod_reg(wkst, module, wkst_off);
                        wkst = prm_read_mod_reg(module, wkst_off);
                        c++;