linux-kernel - [PATCH AUTOSEL 6.1 05/38] ASoC: Intel: sof_cs42l42: always set dpcm

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Date:   Thu,  9 Feb 2023 06:14:24 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>, cezary.rojewski@...el.com,
        liam.r.girdwood@...ux.intel.com, perex@...ex.cz, tiwai@...e.com,
        brent.lu@...el.com, akihiko.odaki@...il.com,
        ye.xingchen@....com.cn, alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 6.1 05/38] ASoC: Intel: sof_cs42l42: always set dpcm_capture for amplifiers

From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

[ Upstream commit e0a52220344ab7defe25b9cdd58fe1dc1122e67c ]

The amplifier may provide hardware support for I/V feedback, or
alternatively the firmware may generate an echo reference attached to
the SSP and dailink used for the amplifier.

To avoid any issues with invalid/NULL substreams in the latter case,
always unconditionally set dpcm_capture.

Link: https://github.com/thesofproject/linux/issues/4083
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@...ux.intel.com>
Link: https://lore.kernel.org/r/20230119163459.2235843-3-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/intel/boards/sof_cs42l42.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/intel/boards/sof_cs42l42.c b/sound/soc/intel/boards/sof_cs42l42.c
index e38bd2831e6ac..e9d190cb13b0a 100644
--- a/sound/soc/intel/boards/sof_cs42l42.c
+++ b/sound/soc/intel/boards/sof_cs42l42.c
@@ -336,6 +336,9 @@ static int create_spk_amp_dai_links(struct device *dev,
 	links[*id].platforms = platform_component;
 	links[*id].num_platforms = ARRAY_SIZE(platform_component);
 	links[*id].dpcm_playback = 1;
+	/* firmware-generated echo reference */
+	links[*id].dpcm_capture = 1;
+
 	links[*id].no_pcm = 1;
 	links[*id].cpus = &cpus[*id];
 	links[*id].num_cpus = 1;
-- 
2.39.0