linux-kernel - [PATCH 5.16 0992/1017] ASoC: topology: Allow TLV control to be either read or write

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Message-Id: <20220405070423.647026987@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:31:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Amadeusz Sławiński 
        <amadeuszx.slawinski@...ux.intel.com>,
        Cezary Rojewski <cezary.rojewski@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.16 0992/1017] ASoC: topology: Allow TLV control to be either read or write

From: Amadeusz Sławiński <amadeuszx.slawinski@...ux.intel.com>

commit feb00b736af64875560f371fe7f58b0b7f239046 upstream.

There is no reason to force readwrite access on TLV controls. It can be
either read, write or both. This is further evidenced in code where it
performs following checks:
                if ((k->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ) && !sbe->get)
                        return -EINVAL;
                if ((k->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE) && !sbe->put)
                        return -EINVAL;

Fixes: 1a3232d2f61d ("ASoC: topology: Add support for TLV bytes controls")
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@...ux.intel.com>
Reviewed-by: Cezary Rojewski <cezary.rojewski@...el.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Link: https://lore.kernel.org/r/20220112170030.569712-3-amadeuszx.slawinski@linux.intel.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 sound/soc/soc-topology.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -512,7 +512,8 @@ static int soc_tplg_kcontrol_bind_io(str
 
 	if (le32_to_cpu(hdr->ops.info) == SND_SOC_TPLG_CTL_BYTES
 		&& k->iface & SNDRV_CTL_ELEM_IFACE_MIXER
-		&& k->access & SNDRV_CTL_ELEM_ACCESS_TLV_READWRITE
+		&& (k->access & SNDRV_CTL_ELEM_ACCESS_TLV_READ
+		    || k->access & SNDRV_CTL_ELEM_ACCESS_TLV_WRITE)
 		&& k->access & SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK) {
 		struct soc_bytes_ext *sbe;
 		struct snd_soc_tplg_bytes_control *be;