ASoC: mediatek: common: Constify struct mtk_sof_priv

Apart from a dai_link_list variable, the mtk_sof_priv currently holds
data that never gets modified during runtime.

Constify the mtk_sof_priv structure and move the SOF dai_link_list as
sof_dai_link_list in struct mtk_soc_card_data, which is a structure
that already holds the card's machine specific, runtime modified data.

This allows to safely pass the mtk_sof_priv structure as platform data
for the commonized card probe mechanism.

Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240416071410.75620-3-angelogioacchino.delregno@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: mediatek: sof-common: Add NULL check for normal_link string

It's not granted that all entries of struct sof_conn_stream declare
a `normal_link` (a non-SOF, direct link) string, and this is the case
for SoCs that support only SOF paths (hence do not support both direct
and SOF usecases).

For example, in the case of MT8188 there is no normal_link string in
any of the sof_conn_stream entries and there will be more drivers
doing that in the future.

To avoid possible NULL pointer KPs, add a NULL check for `normal_link`.

Fixes: 0caf1120c583 ("ASoC: mediatek: mt8195: extract SOF common code")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://msgid.link/r/20240111105226.117603-1-angelogioacchino.delregno@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: mediatek: common: revise SOF common code

Originally, normal dai link fixup callback is overwritten by sof fixup
callback on mtk_sof_card_late_probe and it relies on the mapping defined
on struct sof_conn_stream.

It's not flexible. When a new hardware connection is adopted, user needs
to update struct sof_conn_stream defined in machine driver which is used
to specify the mapping relationship of normal BE and SOF BE.

In the patch, mtk_sof_check_tplg_be_dai_link_fixup() is introduced for
all normal BEs. In mtk_sof_late_probe, back up normal BE fixup if it
exists and then overwrite be_hw_params_fixup by the new callback.

There are two cases for FE and BE connection.

case 1:
SOF FE -> normal BE
-> SOF_BE

case 2:
normal FE -> normal BE

In the new fixup callback, it tries to find SOF_BE which connects to the
same FE, and then reuses the fixup of SOF_BE. If no SOF_BE exists,
it must be case 2, so rollback to the original fixup if it exists.

As a result, the predefined relation is not needed anymore. Hardware
connection can be controlled by the mixer control for AFE interconn.
Then, DPCM finds the BE mapping at runtime.

Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230825024935.10878-3-trevor.wu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: mediatek: use helper function

Current ASoC has many helper function.
This patch use it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/87sffrea3z.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>

ASoC: mediatek: mt8195: extract SOF common code

The functions related to SOF can be reused in different machine drivers,
such as mt8195 or mt8186, so extract the common code to avoid duplication.

Set mtk_soc_card_data which include machine private data and SOF private
data as card drvdata, then the difference between machine private can be
ignored such as mt8195_mt6359_priv or mt8186_mt6366_priv, at the same
time the SOF related code can be reused in different machine drivers.

Signed-off-by: Chunxu Li <chunxu.li@mediatek.com>
Link: https://lore.kernel.org/r/20220715085903.7796-1-chunxu.li@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>