{"id":2223389,"url":"http://patchwork.ozlabs.org/api/patches/2223389/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260415081942.4183108-3-chancel.liu@nxp.com/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/projects/2/?format=json","name":"Linux PPC 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","To":"lgirdwood@gmail.com,\n\tbroonie@kernel.org,\n\tperex@perex.cz,\n\ttiwai@suse.com,\n\tshengjiu.wang@gmail.com,\n\tXiubo.Lee@gmail.com,\n\tfestevam@gmail.com,\n\tnicoleotsuka@gmail.com,\n\tFrank.Li@nxp.com,\n\ts.hauer@pengutronix.de,\n\tkernel@pengutronix.de,\n\tshumingf@realtek.com,\n\trander.wang@linux.intel.com,\n\tpierre-louis.bossart@linux.dev,\n\tlinux-sound@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tlinuxppc-dev@lists.ozlabs.org,\n\timx@lists.linux.dev,\n\tlinux-arm-kernel@lists.infradead.org","Subject":"[PATCH v2 2/3] ASoC: soc-core: Add core support for ignoring suspend\n on selected DAPM widgets","Date":"Wed, 15 Apr 2026 17:19:41 +0900","Message-ID":"<20260415081942.4183108-3-chancel.liu@nxp.com>","X-Mailer":"git-send-email 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DAPM widgets to remain powered\nduring system suspend. Introduce a generic and reusable mechanism in\nthe ASoC core to mark selected DAPM widgets as ignore_suspend.\n\nThe unified mechanism consists of two parts:\n1. Parse and store the name list of widgets to ignore suspend in\nstruct snd_soc_card\n\nThe list of widgets can be provided either by the machine driver or\nparsed from Device Tree. Different machines have different routing and\npower requirements. Each machine can specify its own widgets to ignore\nsuspend through DT property. It enables flexible policy without hard\ncode. A new helper, snd_soc_of_parse_ignore_suspend_widgets() is added\nfor this purpose.\n\n2. Apply ignore_suspend flags during snd_soc_bind_card()\n\nAfter all components have been probed and all DAPM widgets have been\nregistered, snd_soc_bind_card() performs a unified lookup of the\nconfigured widget names across all DAPM contexts of the card and marks\nthe matching widgets with ignore_suspend = 1.\n\nSigned-off-by: Chancel Liu \n---\n include/sound/soc-dapm.h | 1 +\n include/sound/soc.h | 5 +++++\n sound/soc/soc-core.c | 43 ++++++++++++++++++++++++++++++++++++++++\n sound/soc/soc-dapm.c | 30 ++++++++++++++++++++++++++++\n 4 files changed, 79 insertions(+)","diff":"diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h\nindex 4f8fb7622a13..39c290e0eb7f 100644\n--- a/include/sound/soc-dapm.h\n+++ b/include/sound/soc-dapm.h\n@@ -636,6 +636,7 @@ int snd_soc_dapm_new_dai_widgets(struct snd_soc_dapm_context *dapm, struct snd_s\n void snd_soc_dapm_free_widget(struct snd_soc_dapm_widget *w);\n int snd_soc_dapm_link_dai_widgets(struct snd_soc_card *card);\n void snd_soc_dapm_connect_dai_link_widgets(struct snd_soc_card *card);\n+int snd_soc_dapm_ignore_suspend_widgets(struct snd_soc_card *card);\n \n int snd_soc_dapm_update_dai(struct snd_pcm_substream *substream,\n \t\t\t struct snd_pcm_hw_params *params, struct snd_soc_dai *dai);\ndiff --git a/include/sound/soc.h b/include/sound/soc.h\nindex 5e3eb617d832..7d6fa79f48e3 100644\n--- a/include/sound/soc.h\n+++ b/include/sound/soc.h\n@@ -1057,10 +1057,14 @@ struct snd_soc_card {\n \tint num_dapm_widgets;\n \tconst struct snd_soc_dapm_route *dapm_routes;\n \tint num_dapm_routes;\n+\tconst char **ignore_suspend_widgets;\n+\tint num_ignore_suspend_widgets;\n \tconst struct snd_soc_dapm_widget *of_dapm_widgets;\n \tint num_of_dapm_widgets;\n \tconst struct snd_soc_dapm_route *of_dapm_routes;\n \tint num_of_dapm_routes;\n+\tconst char **of_ignore_suspend_widgets;\n+\tint num_of_ignore_suspend_widgets;\n \n \t/* lists of probed devices belonging to this card */\n \tstruct list_head component_dev_list;\n@@ -1339,6 +1343,7 @@ void snd_soc_of_parse_node_prefix(struct device_node *np,\n int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,\n \t\t\t\t const char *propname);\n int snd_soc_of_parse_aux_devs(struct snd_soc_card *card, const char *propname);\n+int snd_soc_of_parse_ignore_suspend_widgets(struct snd_soc_card *card, const char *propname);\n \n unsigned int snd_soc_daifmt_clock_provider_flipped(unsigned int dai_fmt);\n unsigned int snd_soc_daifmt_clock_provider_from_bitmap(unsigned int bit_frame);\ndiff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c\nindex 3fecf9fc903c..705181dae472 100644\n--- a/sound/soc/soc-core.c\n+++ b/sound/soc/soc-core.c\n@@ -2289,6 +2289,10 @@ static int snd_soc_bind_card(struct snd_soc_card *card)\n \tif (ret < 0)\n \t\tgoto probe_end;\n \n+\tret = snd_soc_dapm_ignore_suspend_widgets(card);\n+\tif (ret < 0)\n+\t\tgoto probe_end;\n+\n \tsnd_soc_dapm_new_widgets(card);\n \tsnd_soc_card_fixup_controls(card);\n \n@@ -3294,6 +3298,45 @@ int snd_soc_of_parse_aux_devs(struct snd_soc_card *card, const char *propname)\n }\n EXPORT_SYMBOL_GPL(snd_soc_of_parse_aux_devs);\n \n+int snd_soc_of_parse_ignore_suspend_widgets(struct snd_soc_card *card,\n+\t\t\t\t\t const char *propname)\n+{\n+\tstruct device_node *np = card->dev->of_node;\n+\tint num_widgets;\n+\tconst char **widgets;\n+\tint i;\n+\n+\tnum_widgets = of_property_count_strings(np, propname);\n+\tif (num_widgets < 0) {\n+\t\tdev_err(card->dev,\n+\t\t\t\"ASoC: Property '%s' does not exist\\n\", propname);\n+\t\treturn -EINVAL;\n+\t}\n+\n+\twidgets = devm_kcalloc(card->dev, num_widgets, sizeof(char *), GFP_KERNEL);\n+\tif (!widgets)\n+\t\treturn -ENOMEM;\n+\n+\tfor (i = 0; i < num_widgets; i++) {\n+\t\tconst char *name;\n+\t\tint ret = of_property_read_string_index(np, propname, i, &name);\n+\n+\t\tif (ret) {\n+\t\t\tdev_err(card->dev,\n+\t\t\t\t\"ASoC: Property '%s' could not be read: %d\\n\",\n+\t\t\t\tpropname, ret);\n+\t\t\treturn -EINVAL;\n+\t\t}\n+\t\twidgets[i] = name;\n+\t}\n+\n+\tcard->num_of_ignore_suspend_widgets = num_widgets;\n+\tcard->of_ignore_suspend_widgets = widgets;\n+\n+\treturn 0;\n+}\n+EXPORT_SYMBOL_GPL(snd_soc_of_parse_ignore_suspend_widgets);\n+\n unsigned int snd_soc_daifmt_clock_provider_flipped(unsigned int dai_fmt)\n {\n \tunsigned int inv_dai_fmt = dai_fmt & ~SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;\ndiff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c\nindex c5b80d9ed64b..209f86b9add6 100644\n--- a/sound/soc/soc-dapm.c\n+++ b/sound/soc/soc-dapm.c\n@@ -4595,6 +4595,36 @@ void snd_soc_dapm_connect_dai_link_widgets(struct snd_soc_card *card)\n \t}\n }\n \n+int snd_soc_dapm_ignore_suspend_widgets(struct snd_soc_card *card)\n+{\n+\tstruct snd_soc_dapm_widget *w;\n+\tint i;\n+\n+\tfor (i = 0; i < card->num_ignore_suspend_widgets; i++) {\n+\t\tw = dapm_find_widget(snd_soc_card_to_dapm(card),\n+\t\t\t\t card->ignore_suspend_widgets[i], true);\n+\t\tif (!w) {\n+\t\t\tdev_err(card->dev, \"ASoC: DAPM unknown ignore suspend widget %s\\n\",\n+\t\t\t\tcard->ignore_suspend_widgets[i]);\n+\t\t\treturn -EINVAL;\n+\t\t}\n+\t\tw->ignore_suspend = 1;\n+\t}\n+\n+\tfor (i = 0; i < card->num_of_ignore_suspend_widgets; i++) {\n+\t\tw = dapm_find_widget(snd_soc_card_to_dapm(card),\n+\t\t\t\t card->of_ignore_suspend_widgets[i], true);\n+\t\tif (!w) {\n+\t\t\tdev_err(card->dev, \"ASoC: DAPM unknown ignore suspend widget %s\\n\",\n+\t\t\t\tcard->of_ignore_suspend_widgets[i]);\n+\t\t\treturn -EINVAL;\n+\t\t}\n+\t\tw->ignore_suspend = 1;\n+\t}\n+\n+\treturn 0;\n+}\n+\n static void dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream, int event)\n {\n \tstruct snd_soc_dai *dai;\n","prefixes":["v2","2/3"]}