Re: [PATCH 1/3] ASoC: simple-card-utils: Fix device module clock

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Hi Morimoto-san,


On 2/12/2021 5:14 AM, Kuninori Morimoto wrote:
diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index bc0b62e..0754d70 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -173,16 +173,15 @@ int asoc_simple_parse_clk(struct device *dev,
        *  or device's module clock.
        */
       clk = devm_get_clk_from_child(dev, node, NULL);
-     if (!IS_ERR(clk)) {
-             simple_dai->sysclk = clk_get_rate(clk);
+     if (IS_ERR(clk))
+             clk = devm_get_clk_from_child(dev, dlc->of_node, NULL);

+     if (!IS_ERR(clk)) {
               simple_dai->clk = clk;
-     } else if (!of_property_read_u32(node, "system-clock-frequency", &val)) {
+             simple_dai->sysclk = clk_get_rate(clk);
+     } else if (!of_property_read_u32(node, "system-clock-frequency",
+                                      &val)) {
               simple_dai->sysclk = val;
-     } else {
-             clk = devm_get_clk_from_child(dev, dlc->of_node, NULL);
-             if (!IS_ERR(clk))
-                     simple_dai->sysclk = clk_get_rate(clk);
       }
The comment is indicating that that the clock parsing order,
but this patch exchanges it.
This comment also should be updated, I think.

         /*
          * Parse dai->sysclk come from "clocks = <&xxx>"
          * (if system has common clock)
          *  or "system-clock-frequency = <xxx>"
          *  or device's module clock.
          */

Yes, this can be rephrased now.

asoc_simple_set_clk_rate() will be called if it has simple_dai->clk.
CPU or Codec component clock rate will be exchanged by this patch, I think.
I'm not sure the effect of this patch to existing boards.

If CPU or Codec node does not specifiy "mclk-fs" factor, asoc_simple_set_clk_rate() won't be called. So I don't think there would be any effect w.r.t clock rate. With this patch clocks would get enabled/disabled.


And also, this patch has too many unneeded exchange,
thus it was difficult to read for me.
I think it can be simply like this ?
It is understandable what it want to do.

I think the patch does exactly the same thing as what you are suggesting below. Am I missing anything?


diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 8c423afb9d2e..d441890de4dc 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -168,16 +168,14 @@ int asoc_simple_parse_clk(struct device *dev,
          *  or device's module clock.
          */
         clk = devm_get_clk_from_child(dev, node, NULL);
+       if (IS_ERR(clk))
+               clk = devm_get_clk_from_child(dev, dlc->of_node, NULL);
+
         if (!IS_ERR(clk)) {
                 simple_dai->sysclk = clk_get_rate(clk);
-
                 simple_dai->clk = clk;
         } else if (!of_property_read_u32(node, "system-clock-frequency", &val)) {
                 simple_dai->sysclk = val;
-       } else {
-               clk = devm_get_clk_from_child(dev, dlc->of_node, NULL);
-               if (!IS_ERR(clk))
-                       simple_dai->sysclk = clk_get_rate(clk);
         }

         if (of_property_read_bool(node, "system-clock-direction-out"))



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