ASoC: core: Allow topology to override machine driver FE DAI link config.

Machine drivers statically define a number of DAI links that currently
cannot be changed or removed by topology. This means PCMs and platform
components cannot be changed by topology at runtime AND machine drivers
are tightly coupled to topology.

This patch allows topology to override the machine driver DAI link config
in order to reuse machine drivers with different topologies and platform
components. The patch supports :-

1) create new FE PCMs with a topology defined PCM ID.
2) destroy existing static FE PCMs
3) change the platform component driver.
4) assign any new HW params fixups.

The patch requires no changes to the machine drivers, but does add some
platform component flags that the platform component driver can assign
before loading topologies.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

2 files changed, 88 insertions, 3 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index bf7ca32ab31f..8f01fe8296ff 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1050,6 +1050,9 @@ static int soc_bind_dai_link(struct snd_soc_card *card,
         const char *platform_name;
         int i;
 
+        if (dai_link->ignore)
+                return 0;
+
         dev_dbg(card->dev, "ASoC: binding %s\n", dai_link->name);
 
         if (soc_is_dai_link_bound(card, dai_link)) {
@@ -1672,7 +1675,7 @@ static int soc_probe_link_dais(struct snd_soc_card *card,
 {
         struct snd_soc_dai_link *dai_link = rtd->dai_link;
         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
-        int i, ret;
+        int i, ret, num;
 
         dev_dbg(card->dev, "ASoC: probe %s dai link %d late %d\n",
                         card->name, rtd->num, order);
@@ -1718,9 +1721,23 @@ static int soc_probe_link_dais(struct snd_soc_card *card,
                 soc_dpcm_debugfs_add(rtd);
 #endif
 
+        /*
+         * most drivers will register their PCMs using DAI link ordering but
+         * topology based drivers can use the DAI link id field to set PCM
+         * device number and then use rtd + a base offset of the BEs.
+         */
+        if (rtd->platform->driver->use_dai_pcm_id) {
+                if (rtd->dai_link->no_pcm)
+                        num = rtd->platform->driver->be_pcm_base + rtd->num;
+                else
+                        num = rtd->dai_link->id;
+        } else {
+                num = rtd->num;
+        }
+
         if (cpu_dai->driver->compress_new) {
                 /*create compress_device"*/
-                ret = cpu_dai->driver->compress_new(rtd, rtd->num);
+                ret = cpu_dai->driver->compress_new(rtd, num);
                 if (ret < 0) {
                         dev_err(card->dev, "ASoC: can't create compress %s\n",
                                          dai_link->stream_name);
@@ -1730,7 +1747,7 @@ static int soc_probe_link_dais(struct snd_soc_card *card,
 
                 if (!dai_link->params) {
                         /* create the pcm */
-                        ret = soc_new_pcm(rtd, rtd->num);
+                        ret = soc_new_pcm(rtd, num);
                         if (ret < 0) {
                                 dev_err(card->dev, "ASoC: can't create pcm %s :%d\n",
                                        dai_link->stream_name, ret);
@@ -2076,6 +2093,59 @@ int snd_soc_set_dmi_name(struct snd_soc_card *card, const char *flavour)
 EXPORT_SYMBOL_GPL(snd_soc_set_dmi_name);
 #endif /* CONFIG_DMI */
 
+static void soc_check_tplg_fes(struct snd_soc_card *card)
+{
+        struct snd_soc_platform *platform;
+        struct snd_soc_dai_link *dai_link;
+        int i;
+
+        list_for_each_entry(platform, &platform_list, list) {
+
+                /* does this platform override FEs ? */
+                if (!platform->driver->ignore_machine)
+                        continue;
+
+                /* for this machine ? */
+                if (strcmp(platform->driver->ignore_machine,
+                           card->dev->driver->name))
+                        continue;
+
+                /* machine matches, so override the rtd data */
+                for (i = 0; i < card->num_links; i++) {
+
+                        dai_link = &card->dai_link[i];
+
+                        /* ignore this FE */
+                        if (dai_link->dynamic) {
+                                dai_link->ignore = true;
+                                continue;
+                        }
+
+                        dev_info(card->dev, "info: override FE DAI link %s\n",
+                                 card->dai_link[i].name);
+
+                        /* override platform */
+                        dai_link->platform_name = platform->component.name;
+                        dai_link->cpu_dai_name = platform->component.name;
+
+                        /* convert non BE into BE */
+                        dai_link->no_pcm = 1;
+                        dai_link->dpcm_playback = 1;
+                        dai_link->dpcm_capture = 1;
+
+                        /* override any BE fixups */
+                        dai_link->be_hw_params_fixup =
+                                platform->driver->be_hw_params_fixup;
+
+                        /* most BE links dont set stream name, so set it to
+                         * dai link name if it's NULL to help bind widgets.
+                         */
+                        if (!dai_link->stream_name)
+                                dai_link->stream_name = dai_link->name;
+                }
+        }
+}
+
 static int snd_soc_instantiate_card(struct snd_soc_card *card)
 {
         struct snd_soc_codec *codec;
@@ -2086,6 +2156,9 @@ static int snd_soc_instantiate_card(struct snd_soc_card *card)
         mutex_lock(&client_mutex);
         mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_INIT);
 
+        /* check whether any platform is ignore machine FE and using topology */
+        soc_check_tplg_fes(card);
+
         /* bind DAIs */
         for (i = 0; i < card->num_links; i++) {
                 ret = soc_bind_dai_link(card, &card->dai_link[i]);
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 68d9dc930096..4ce489165a6d 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -909,8 +909,20 @@ int soc_dai_hw_params(struct snd_pcm_substream *substream,
                       struct snd_pcm_hw_params *params,
                       struct snd_soc_dai *dai)
 {
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
         int ret;
 
+        /* perform any topology hw_params fixups before DAI  */
+        if (rtd->dai_link->be_hw_params_fixup) {
+                ret = rtd->dai_link->be_hw_params_fixup(rtd, params);
+                if (ret < 0) {
+                        dev_err(rtd->dev,
+                                "ASoC: hw_params topology fixup failed %d\n",
+                                ret);
+                        return ret;
+                }
+        }
+
         if (dai->driver->ops->hw_params) {
                 ret = dai->driver->ops->hw_params(substream, params, dai);
                 if (ret < 0) {