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The i915 display power is requested both by controller (for init and link reset) as well as by codec driver (for codec control). There's an additional constraint that on some platforms frequent changes to display power state may cause visible flicker. To avoid this, the SOF hda controller requests display power whenever it is active and only releases it when runtime suspended. This patch utilizes the new hdac_bus link_power op to plug into HDA link state changes. By monitoring link state changes, we can keep the controller side display power wakeref until the codec driver has completed its work, and only release the wakeref when codec driver is suspended. Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Acked-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20210205184630.1938761-4-kai.vehmanen@linux.intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de> |
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| .. | ||
| apl.c | ||
| bdw.c | ||
| byt.c | ||
| cnl.c | ||
| ext_manifest.h | ||
| hda-bus.c | ||
| hda-codec.c | ||
| hda-compress.c | ||
| hda-ctrl.c | ||
| hda-dai.c | ||
| hda-dsp.c | ||
| hda-ipc.c | ||
| hda-ipc.h | ||
| hda-loader.c | ||
| hda-pcm.c | ||
| hda-stream.c | ||
| hda-trace.c | ||
| hda.c | ||
| hda.h | ||
| icl.c | ||
| intel-ipc.c | ||
| Kconfig | ||
| Makefile | ||
| shim.h | ||
| tgl.c | ||