[PATCH v2 0/3] ASoC: soc-core: Add core support for ignoring suspend on selected DAPM widgets

[Chancel Liu]

Some audio systems require specific DAPM widgets to remain powered
during system suspend. Introduce a generic and reusable mechanism in
the ASoC core to mark selected DAPM widgets as ignore_suspend.

The unified mechanism consists of two parts:
1. Parse and store the name list of widgets to ignore suspend in
struct snd_soc_card

The list of widgets can be provided either by the machine driver or
parsed from Device Tree. Different machines have different routing and
power requirements. Each machine can specify its own widgets to ignore
suspend through DT property. It enables flexible policy without hard
code. A new helper, snd_soc_of_parse_ignore_suspend_widgets() is added
for this purpose.

2. Apply ignore_suspend flags during snd_soc_bind_card()

After all components have been probed and all DAPM widgets have been
registered, snd_soc_bind_card() performs a unified lookup of the
configured widget names across all DAPM contexts of the card and marks
the matching widgets with ignore_suspend = 1.

Switch to use core ignore-suspend-widgets support for imx-rpmsg driver.

This v2 series is a rework of the previous "[PATCH] ASoC: imx-rpmsg:
Fix ignore-suspend-widgets only applied to codec DAPM".
Changes in v2:
- Rework to use a unified core mechanism instead of machine driver
specific code

Chancel Liu (3):
  ASoC: dapm: Fix widget lookup with prefixed names across DAPM contexts
  ASoC: soc-core: Add core support for ignoring suspend on selected DAPM
    widgets
  ASoC: fsl: imx-rpmsg: Switch to core ignore-suspend-widgets support

 include/sound/soc-dapm.h  |  1 +
 include/sound/soc.h       |  5 +++++
 sound/soc/fsl/imx-rpmsg.c | 26 ++++++++---------------
 sound/soc/soc-core.c      | 43 +++++++++++++++++++++++++++++++++++++++
 sound/soc/soc-dapm.c      | 43 ++++++++++++++++++++++++++++-----------
 5 files changed, 89 insertions(+), 29 deletions(-)

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2.50.1