From b8b9b3da94a0c27090ceba243fdf54fb518c5489 Mon Sep 17 00:00:00 2001
From: Tanu Kaskinen <tanuk@iki.fi>
Date: Mon, 1 Feb 2016 15:34:59 +0200
Subject: [PATCH] Revert "module-switch-on-port-available: Route to preferred
 profile"

This reverts commit e87100d41ef6d14f8dc7f803582191d9f8d8f183.

The reverted commit had some unwanted consequences:
https://bugs.freedesktop.org/show_bug.cgi?id=93903
https://bugs.freedesktop.org/show_bug.cgi?id=93946

The first regression has a fix here:
https://patchwork.freedesktop.org/patch/72053/

The second regression, however, doesn't have a fix yet. Therefore,
it's best to revert the offending patch for now.

Upstream-Status: Inappropriate [Upstream plans to fix the issues
properly.]

Signed-off-by: Tanu Kaskinen <tanuk@iki.fi>
---
 src/modules/module-switch-on-port-available.c | 172 ++++++++++----------------
 1 file changed, 67 insertions(+), 105 deletions(-)

diff --git a/src/modules/module-switch-on-port-available.c b/src/modules/module-switch-on-port-available.c
index 5dd9786..8de68a3 100644
--- a/src/modules/module-switch-on-port-available.c
+++ b/src/modules/module-switch-on-port-available.c
@@ -74,25 +74,22 @@ static bool profile_good_for_input(pa_card_profile *profile) {
 static int try_to_switch_profile(pa_device_port *port) {
     pa_card_profile *best_profile = NULL, *profile;
     void *state;
-    unsigned best_prio = 0;
 
-    pa_log_debug("Finding best profile for port %s, preferred = %s",
-                 port->name, pa_strnull(port->preferred_profile));
+    pa_log_debug("Finding best profile");
 
     PA_HASHMAP_FOREACH(profile, port->profiles, state) {
         bool good = false;
-        const char *name;
-        unsigned prio = profile->priority;
+
+        if (best_profile && best_profile->priority >= profile->priority)
+            continue;
 
         /* We make a best effort to keep other direction unchanged */
         switch (port->direction) {
             case PA_DIRECTION_OUTPUT:
-                name = profile->output_name;
                 good = profile_good_for_output(profile);
                 break;
 
             case PA_DIRECTION_INPUT:
-                name = profile->input_name;
                 good = profile_good_for_input(profile);
                 break;
         }
@@ -100,15 +97,7 @@ static int try_to_switch_profile(pa_device_port *port) {
         if (!good)
             continue;
 
-        /* Give a high bonus in case this is the preferred profile */
-        if (port->preferred_profile && pa_streq(name ? name : profile->name, port->preferred_profile))
-            prio += 1000000;
-
-        if (best_profile && best_prio >= prio)
-            continue;
-
         best_profile = profile;
-        best_prio = prio;
     }
 
     if (!best_profile) {
@@ -124,125 +113,98 @@ static int try_to_switch_profile(pa_device_port *port) {
     return 0;
 }
 
-struct port_pointers {
-    pa_device_port *port;
-    pa_sink *sink;
-    pa_source *source;
-    bool is_possible_profile_active;
-    bool is_preferred_profile_active;
-    bool is_port_active;
-};
-
-static const char* profile_name_for_dir(pa_card_profile *cp, pa_direction_t dir) {
-    if (dir == PA_DIRECTION_OUTPUT && cp->output_name)
-        return cp->output_name;
-    if (dir == PA_DIRECTION_INPUT && cp->input_name)
-        return cp->input_name;
-    return cp->name;
-}
-
-static struct port_pointers find_port_pointers(pa_device_port *port) {
-    struct port_pointers pp = { .port = port };
+static void find_sink_and_source(pa_card *card, pa_device_port *port, pa_sink **si, pa_source **so) {
+    pa_sink *sink = NULL;
+    pa_source *source = NULL;
     uint32_t state;
-    pa_card *card;
-
-    pa_assert(port);
-    pa_assert_se(card = port->card);
 
     switch (port->direction) {
         case PA_DIRECTION_OUTPUT:
-            PA_IDXSET_FOREACH(pp.sink, card->sinks, state)
-                if (port == pa_hashmap_get(pp.sink->ports, port->name))
+            PA_IDXSET_FOREACH(sink, card->sinks, state)
+                if (port == pa_hashmap_get(sink->ports, port->name))
                     break;
             break;
 
         case PA_DIRECTION_INPUT:
-            PA_IDXSET_FOREACH(pp.source, card->sources, state)
-                if (port == pa_hashmap_get(pp.source->ports, port->name))
+            PA_IDXSET_FOREACH(source, card->sources, state)
+                if (port == pa_hashmap_get(source->ports, port->name))
                     break;
             break;
     }
 
-    pp.is_possible_profile_active =
-        card->active_profile == pa_hashmap_get(port->profiles, card->active_profile->name);
-    pp.is_preferred_profile_active = pp.is_possible_profile_active && (!port->preferred_profile ||
-        pa_safe_streq(port->preferred_profile, profile_name_for_dir(card->active_profile, port->direction)));
-    pp.is_port_active = (pp.sink && pp.sink->active_port == port) || (pp.source && pp.source->active_port == port);
-
-    return pp;
+    *si = sink;
+    *so = source;
 }
 
-/* Switches to a port, switching profiles if necessary or preferred */
-static bool switch_to_port(pa_device_port *port) {
-    struct port_pointers pp = find_port_pointers(port);
+static pa_hook_result_t port_available_hook_callback(pa_core *c, pa_device_port *port, void* userdata) {
+    pa_card* card;
+    pa_sink *sink;
+    pa_source *source;
+    bool is_active_profile, is_active_port;
 
-    if (pp.is_port_active)
-        return true; /* Already selected */
+    if (port->available == PA_AVAILABLE_UNKNOWN)
+        return PA_HOOK_OK;
 
-    pa_log_debug("Trying to switch to port %s", port->name);
-    if (!pp.is_preferred_profile_active) {
-        if (try_to_switch_profile(port) < 0) {
-            if (pp.is_possible_profile_active)
-                return false;
-        }
-        else
-            /* Now that profile has changed, our sink and source pointers must be updated */
-            pp = find_port_pointers(port);
-    }
+    card = port->card;
 
-    if (pp.source)
-        pa_source_set_port(pp.source, port->name, false);
-    if (pp.sink)
-        pa_sink_set_port(pp.sink, port->name, false);
-    return true;
-}
+    if (!card) {
+        pa_log_warn("Port %s does not have a card", port->name);
+        return PA_HOOK_OK;
+    }
 
-/* Switches away from a port, switching profiles if necessary or preferred */
-static bool switch_from_port(pa_device_port *port) {
-    struct port_pointers pp = find_port_pointers(port);
-    pa_device_port *p, *best_port = NULL;
-    void *state;
+    if (pa_idxset_size(card->sinks) == 0 && pa_idxset_size(card->sources) == 0)
+        /* This card is not initialized yet. We'll handle it in
+           sink_new / source_new callbacks later. */
+        return PA_HOOK_OK;
 
-    if (!pp.is_port_active)
-        return true; /* Already deselected */
+    find_sink_and_source(card, port, &sink, &source);
 
-    /* Try to find a good enough port to switch to */
-    PA_HASHMAP_FOREACH(p, port->card->ports, state)
-        if (p->direction == port->direction && p != port && p->available != PA_AVAILABLE_NO &&
-           (!best_port || best_port->priority < p->priority))
-           best_port = p;
+    is_active_profile = card->active_profile == pa_hashmap_get(port->profiles, card->active_profile->name);
+    is_active_port = (sink && sink->active_port == port) || (source && source->active_port == port);
 
-    pa_log_debug("Trying to switch away from port %s, found %s", port->name, best_port ? best_port->name : "no better option");
+    if (port->available == PA_AVAILABLE_NO && !is_active_port)
+        return PA_HOOK_OK;
 
-    if (best_port)
-        return switch_to_port(best_port);
+    if (port->available == PA_AVAILABLE_YES) {
+        if (is_active_port)
+            return PA_HOOK_OK;
 
-    return false;
-}
+        if (!is_active_profile) {
+            if (try_to_switch_profile(port) < 0)
+                return PA_HOOK_OK;
 
+            pa_assert(card->active_profile == pa_hashmap_get(port->profiles, card->active_profile->name));
 
-static pa_hook_result_t port_available_hook_callback(pa_core *c, pa_device_port *port, void* userdata) {
-    pa_assert(port);
+            /* Now that profile has changed, our sink and source pointers must be updated */
+            find_sink_and_source(card, port, &sink, &source);
+        }
 
-    if (!port->card) {
-        pa_log_warn("Port %s does not have a card", port->name);
-        return PA_HOOK_OK;
+        if (source)
+            pa_source_set_port(source, port->name, false);
+        if (sink)
+            pa_sink_set_port(sink, port->name, false);
     }
 
-    if (pa_idxset_size(port->card->sinks) == 0 && pa_idxset_size(port->card->sources) == 0)
-        /* This card is not initialized yet. We'll handle it in
-           sink_new / source_new callbacks later. */
-        return PA_HOOK_OK;
+    if (port->available == PA_AVAILABLE_NO) {
+        if (sink) {
+            pa_device_port *p2 = pa_device_port_find_best(sink->ports);
+
+            if (p2 && p2->available != PA_AVAILABLE_NO)
+                pa_sink_set_port(sink, p2->name, false);
+            else {
+                /* Maybe try to switch to another profile? */
+            }
+        }
 
-    switch (port->available) {
-    case PA_AVAILABLE_YES:
-        switch_to_port(port);
-        break;
-    case PA_AVAILABLE_NO:
-        switch_from_port(port);
-        break;
-    default:
-        break;
+        if (source) {
+            pa_device_port *p2 = pa_device_port_find_best(source->ports);
+
+            if (p2 && p2->available != PA_AVAILABLE_NO)
+                pa_source_set_port(source, p2->name, false);
+            else {
+                /* Maybe try to switch to another profile? */
+            }
+        }
     }
 
     return PA_HOOK_OK;
-- 
2.7.0