omap2+: Add separate list for dynamic pads to mux

This avoids going through the list unnecessarily when
idling devices for runtime PM.

Based on an earlier patch by sricharan <r.sricharan@ti.com>.

Signed-off-by: sricharan <r.sricharan@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

4 files changed, 83 insertions, 16 deletions

diff --git a/arch/arm/mach-omap2/mux.c b/arch/arm/mach-omap2/mux.c
index 6c84659cf84..8717370c91b 100644
--- a/arch/arm/mach-omap2/mux.c
+++ b/arch/arm/mach-omap2/mux.c
@@ -258,7 +258,7 @@ struct omap_hwmod_mux_info * __init
 omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads)
 {
         struct omap_hwmod_mux_info *hmux;
-        int i;
+        int i, nr_pads_dynamic = 0;
 
         if (!bpads || nr_pads < 1)
                 return NULL;
@@ -302,9 +302,40 @@ omap_hwmod_mux_init(struct omap_device_pad *bpads, int nr_pads)
                 pad->enable = bpad->enable;
                 pad->idle = bpad->idle;
                 pad->off = bpad->off;
+
+                if (pad->flags & OMAP_DEVICE_PAD_REMUX)
+                        nr_pads_dynamic++;
+
                 pr_debug("%s: Initialized %s\n", __func__, pad->name);
         }
 
+        if (!nr_pads_dynamic)
+                return hmux;
+
+        /*
+         * Add pads that need dynamic muxing into a separate list
+         */
+
+        hmux->nr_pads_dynamic = nr_pads_dynamic;
+        hmux->pads_dynamic = kzalloc(sizeof(struct omap_device_pad *) *
+                                        nr_pads_dynamic, GFP_KERNEL);
+        if (!hmux->pads_dynamic) {
+                pr_err("%s: Could not allocate dynamic pads\n", __func__);
+                return hmux;
+        }
+
+        nr_pads_dynamic = 0;
+        for (i = 0; i < hmux->nr_pads; i++) {
+                struct omap_device_pad *pad = &hmux->pads[i];
+
+                if (pad->flags & OMAP_DEVICE_PAD_REMUX) {
+                        pr_debug("%s: pad %s tagged dynamic\n",
+                                        __func__, pad->name);
+                        hmux->pads_dynamic[nr_pads_dynamic] = pad;
+                        nr_pads_dynamic++;
+                }
+        }
+
         return hmux;
 
 err3:
@@ -322,6 +353,44 @@ void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
 {
         int i;
 
+        /* Runtime idling of dynamic pads */
+        if (state == _HWMOD_STATE_IDLE && hmux->enabled) {
+                for (i = 0; i < hmux->nr_pads_dynamic; i++) {
+                        struct omap_device_pad *pad = hmux->pads_dynamic[i];
+                        int val = -EINVAL;
+
+                        pad->flags |= OMAP_DEVICE_PAD_IDLE;
+                        val = pad->idle;
+                        omap_mux_write(pad->partition, val,
+                                        pad->mux->reg_offset);
+                }
+
+                return;
+        }
+
+        /* Runtime enabling of dynamic pads */
+        if ((state == _HWMOD_STATE_ENABLED) && hmux->pads_dynamic) {
+                int idled = 0;
+
+                for (i = 0; i < hmux->nr_pads_dynamic; i++) {
+                        struct omap_device_pad *pad = hmux->pads_dynamic[i];
+                        int val = -EINVAL;
+
+                        if (!(pad->flags & OMAP_DEVICE_PAD_IDLE))
+                                continue;
+
+                        pad->flags &= ~OMAP_DEVICE_PAD_IDLE;
+                        val = pad->enable;
+                        omap_mux_write(pad->partition, val,
+                                        pad->mux->reg_offset);
+                        idled++;
+                }
+
+                if (idled)
+                        return;
+        }
+
+        /* Enabling or disabling of all pads */
         for (i = 0; i < hmux->nr_pads; i++) {
                 struct omap_device_pad *pad = &hmux->pads[i];
                 int flags, val = -EINVAL;
@@ -330,21 +399,10 @@ void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
 
                 switch (state) {
                 case _HWMOD_STATE_ENABLED:
-                        if (flags & OMAP_DEVICE_PAD_ENABLED)
-                                break;
-                        flags |= OMAP_DEVICE_PAD_ENABLED;
                         val = pad->enable;
                         pr_debug("%s: Enabling %s %x\n", __func__,
                                         pad->name, val);
                         break;
-                case _HWMOD_STATE_IDLE:
-                        if (!(flags & OMAP_DEVICE_PAD_REMUX))
-                                break;
-                        flags &= ~OMAP_DEVICE_PAD_ENABLED;
-                        val = pad->idle;
-                        pr_debug("%s: Idling %s %x\n", __func__,
-                                        pad->name, val);
-                        break;
                 case _HWMOD_STATE_DISABLED:
                 default:
                         /* Use safe mode unless OMAP_DEVICE_PAD_REMUX */
@@ -352,7 +410,6 @@ void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
                                 val = pad->off;
                         else
                                 val = OMAP_MUX_MODE7;
-                        flags &= ~OMAP_DEVICE_PAD_ENABLED;
                         pr_debug("%s: Disabling %s %x\n", __func__,
                                         pad->name, val);
                 };
@@ -363,6 +420,11 @@ void omap_hwmod_mux(struct omap_hwmod_mux_info *hmux, u8 state)
                         pad->flags = flags;
                 }
         }
+
+        if (state == _HWMOD_STATE_ENABLED)
+                hmux->enabled = true;
+        else
+                hmux->enabled = false;
 }
 
 #ifdef CONFIG_DEBUG_FS
diff --git a/arch/arm/mach-omap2/mux.h b/arch/arm/mach-omap2/mux.h
index a4ab17a737a..1d5bf4298c6 100644
--- a/arch/arm/mach-omap2/mux.h
+++ b/arch/arm/mach-omap2/mux.h
@@ -159,7 +159,7 @@ struct omap_board_mux {
         u16     value;
 };
 
-#define OMAP_DEVICE_PAD_ENABLED         BIT(7)  /* Not needed for board-*.c */
+#define OMAP_DEVICE_PAD_IDLE            BIT(7)  /* Not needed for board-*.c */
 #define OMAP_DEVICE_PAD_REMUX           BIT(1)  /* Dynamically remux a pad,
                                                    needs enable, idle and off
                                                    values */
diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 4c8329e4e6e..e03429453ce 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -1244,7 +1244,9 @@ static int _enable(struct omap_hwmod *oh)
                 _deassert_hardreset(oh, oh->rst_lines[0].name);
 
         /* Mux pins for device runtime if populated */
-        if (oh->mux)
+        if (oh->mux && (!oh->mux->enabled ||
+                        ((oh->_state == _HWMOD_STATE_IDLE) &&
+                         oh->mux->pads_dynamic)))
                 omap_hwmod_mux(oh->mux, _HWMOD_STATE_ENABLED);
 
         _add_initiator_dep(oh, mpu_oh);
@@ -1293,7 +1295,7 @@ static int _idle(struct omap_hwmod *oh)
         _disable_clocks(oh);
 
         /* Mux pins for device idle if populated */
-        if (oh->mux)
+        if (oh->mux && oh->mux->pads_dynamic)
                 omap_hwmod_mux(oh->mux, _HWMOD_STATE_IDLE);
 
         oh->_state = _HWMOD_STATE_IDLE;
diff --git a/arch/arm/plat-omap/include/plat/omap_hwmod.h b/arch/arm/plat-omap/include/plat/omap_hwmod.h
index 23c77cd4abe..1adea9c6298 100644
--- a/arch/arm/plat-omap/include/plat/omap_hwmod.h
+++ b/arch/arm/plat-omap/include/plat/omap_hwmod.h
@@ -90,6 +90,9 @@ extern struct omap_hwmod_sysc_fields omap_hwmod_sysc_type2;
 struct omap_hwmod_mux_info {
         int                             nr_pads;
         struct omap_device_pad          *pads;
+        int                             nr_pads_dynamic;
+        struct omap_device_pad          **pads_dynamic;
+        bool                            enabled;
 };
 
 /**