ASoC: rsnd: call request_irq/free_irq once in MIX case

Each module's dai callback function availability is controlled
by mod->status. For example "always called", "call once".
In .probe/.remove case, it needs to be called always, because
.probe will call xxx_attach() function on .probe, especially
if platform is using MIXer.
For example, below case, MIX0/DVC0/SSI0 needs to be called twice.

        playback = <&src0 &ctu02 &mix0 &dvc0 &ssi0>;
        playback = <&src2 &ctu03 &mix0 &dvc0 &ssi0>;

But in this case, SSI0 will call request_irq() twice.
This patch add new RSND_SSI_PROBED flag and control it

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sh/rcar/ssi.c b/sound/soc/sh/rcar/ssi.c
index ca9355b86bd9be4523ef5299f2fff1a58677044d..8bb47144660b0bde92b33c0ea436f56d1cc20ea9 100644 (file)
--- a/sound/soc/sh/rcar/ssi.c
+++ b/sound/soc/sh/rcar/ssi.c
@@ -90,6 +90,7 @@ struct rsnd_ssi {
 #define RSND_SSI_NO_BUSIF              (1 << 1) /* SSI+DMA without BUSIF */
 #define RSND_SSI_HDMI0                 (1 << 2) /* for HDMI0 */
 #define RSND_SSI_HDMI1                 (1 << 3) /* for HDMI1 */
+#define RSND_SSI_PROBED                        (1 << 4)
 
 #define for_each_rsnd_ssi(pos, priv, i)                                        \
        for (i = 0;                                                     \
@@ -103,6 +104,7 @@ struct rsnd_ssi {
 #define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod)
 #define rsnd_ssi_flags_has(p, f) ((p)->flags & f)
 #define rsnd_ssi_flags_set(p, f) ((p)->flags |= f)
+#define rsnd_ssi_flags_del(p, f) ((p)->flags = ((p)->flags & ~f))
 #define rsnd_ssi_is_parent(ssi, io) ((ssi) == rsnd_io_to_mod_ssip(io))
 #define rsnd_ssi_is_multi_slave(mod, io) \
        (rsnd_ssi_multi_slaves(io) & (1 << rsnd_mod_id(mod)))
@@ -784,11 +786,22 @@ static int rsnd_ssi_common_probe(struct rsnd_mod *mod,
        /*
         * SSI might be called again as PIO fallback
         * It is easy to manual handling for IRQ request/free
+        *
+        * OTOH, this function might be called many times if platform is
+        * using MIX. It needs xxx_attach() many times on xxx_probe().
+        * Because of it, we can't control .probe/.remove calling count by
+        * mod->status.
+        * But it don't need to call request_irq() many times.
+        * Let's control it by RSND_SSI_PROBED flag.
         */
-       ret = request_irq(ssi->irq,
-                         rsnd_ssi_interrupt,
-                         IRQF_SHARED,
-                         dev_name(dev), mod);
+       if (!rsnd_ssi_flags_has(ssi, RSND_SSI_PROBED)) {
+               ret = request_irq(ssi->irq,
+                                 rsnd_ssi_interrupt,
+                                 IRQF_SHARED,
+                                 dev_name(dev), mod);
+
+               rsnd_ssi_flags_set(ssi, RSND_SSI_PROBED);
+       }
 
        return ret;
 }
@@ -805,7 +818,11 @@ static int rsnd_ssi_common_remove(struct rsnd_mod *mod,
                return 0;
 
        /* PIO will request IRQ again */
-       free_irq(ssi->irq, mod);
+       if (rsnd_ssi_flags_has(ssi, RSND_SSI_PROBED)) {
+               free_irq(ssi->irq, mod);
+
+               rsnd_ssi_flags_del(ssi, RSND_SSI_PROBED);
+       }
 
        return 0;
 }