ASoC: meson: axg-tdm-interface: add frame rate constraint

According to Amlogic datasheets for the SoCs supported by this driver, the
maximum bit clock rate is 100MHz.

The tdm interface allows the rates listed by the DAI driver, regardless of
the number slots or their width. However, these will impact the bit clock
rate.

Hitting the 100MHz limit is very unlikely for most use cases but it is
possible.

For example with 32 slots / 32 bits wide, the maximum rate is no longer
384kHz but ~96kHz.

Add the constraint accordingly if the component is not already active.
If it is active, the rate is already constrained by the first stream rate.

Fixes: d60e4f1e4be5 ("ASoC: meson: add tdm interface driver")
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://msgid.link/r/20240223175116.2005407-3-jbrunet@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/meson/axg-tdm-interface.c b/sound/soc/meson/axg-tdm-interface.c
index cd5168e826df4f2abbc605874013883d43646e28..2cedbce738373b43b97e1cc03599b878d786729c 100644 (file)
--- a/sound/soc/meson/axg-tdm-interface.c
+++ b/sound/soc/meson/axg-tdm-interface.c
@@ -12,6 +12,9 @@
 
 #include "axg-tdm.h"
 
+/* Maximum bit clock frequency according the datasheets */
+#define MAX_SCLK 100000000 /* Hz */
+
 enum {
        TDM_IFACE_PAD,
        TDM_IFACE_LOOPBACK,
@@ -153,19 +156,27 @@ static int axg_tdm_iface_startup(struct snd_pcm_substream *substream,
                return -EINVAL;
        }
 
-       /* Apply component wide rate symmetry */
        if (snd_soc_component_active(dai->component)) {
+               /* Apply component wide rate symmetry */
                ret = snd_pcm_hw_constraint_single(substream->runtime,
                                                   SNDRV_PCM_HW_PARAM_RATE,
                                                   iface->rate);
-               if (ret < 0) {
-                       dev_err(dai->dev,
-                               "can't set iface rate constraint\n");
-                       return ret;
-               }
+
+       } else {
+               /* Limit rate according to the slot number and width */
+               unsigned int max_rate =
+                       MAX_SCLK / (iface->slots * iface->slot_width);
+               ret = snd_pcm_hw_constraint_minmax(substream->runtime,
+                                                  SNDRV_PCM_HW_PARAM_RATE,
+                                                  0, max_rate);
        }
 
-       return 0;
+       if (ret < 0)
+               dev_err(dai->dev, "can't set iface rate constraint\n");
+       else
+               ret = 0;
+
+       return ret;
 }
 
 static int axg_tdm_iface_set_stream(struct snd_pcm_substream *substream,