ASoC: q6routing: add dummy register read/write function

BugLink: https://bugs.launchpad.net/bugs/1893115
[ Upstream commit 796a58fe2b8c9b6668db00d92512ec84be663027 ]

Most of the DAPM widgets for DSP ASoC components reuse reg field
of the widgets for its internal calculations, however these are not
real registers. So read/writes to these numbers are not really
valid. However ASoC core will read these registers to get default
state during startup.

With recent changes to ASoC core, every register read/write
failures are reported very verbosely. Prior to this fails to reads
are totally ignored, so we never saw any error messages.

To fix this add dummy read/write function to return default value.

Fixes: e3a33673e845 ("ASoC: qdsp6: q6routing: Add q6routing driver")
Reported-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200811120205.21805-2-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/sound/soc/qcom/qdsp6/q6routing.c b/sound/soc/qcom/qdsp6/q6routing.c
index ddcd9978cf57b8c6310b9c114f1f58c75efd51db..745cc9dd14f381336f633c6b228b206ac7a889f0 100644 (file)
--- a/sound/soc/qcom/qdsp6/q6routing.c
+++ b/sound/soc/qcom/qdsp6/q6routing.c
@@ -996,6 +996,20 @@ static int msm_routing_probe(struct snd_soc_component *c)
        return 0;
 }
 
+static unsigned int q6routing_reg_read(struct snd_soc_component *component,
+                                      unsigned int reg)
+{
+       /* default value */
+       return 0;
+}
+
+static int q6routing_reg_write(struct snd_soc_component *component,
+                              unsigned int reg, unsigned int val)
+{
+       /* dummy */
+       return 0;
+}
+
 static const struct snd_soc_component_driver msm_soc_routing_component = {
        .ops = &q6pcm_routing_ops,
        .probe = msm_routing_probe,
@@ -1004,6 +1018,8 @@ static const struct snd_soc_component_driver msm_soc_routing_component = {
        .num_dapm_widgets = ARRAY_SIZE(msm_qdsp6_widgets),
        .dapm_routes = intercon,
        .num_dapm_routes = ARRAY_SIZE(intercon),
+       .read = q6routing_reg_read,
+       .write = q6routing_reg_write,
 };
 
 static int q6pcm_routing_probe(struct platform_device *pdev)