ASoC: rsnd: ignore DIRQ when DMA transfer

SSI interrupt handler of R-Car sound driver will be called
when DIRQ (= Data read/write timing for PIO) or
UIRQ / OIRQ (= under/over run error).
DIRQ "interrupt" doesn't occur when DMA transfer, but then,
DIRQ "status bit" might occur. we need to ignore this DIRQ
operation when DMA. Otherwise, driver will push/pop as PIO.

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

sound/soc/sh/rcar/ssi.c

@@ -384,13 +384,14 @@ static irqreturn_t rsnd_ssi_interrupt(int irq, void *data)
 	struct rsnd_mod *mod = &ssi->mod;
 	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
 	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
+	int is_dma = rsnd_ssi_is_dma_mode(mod);
 	u32 status = rsnd_mod_read(mod, SSISR);
 
 	if (!io)
 		return IRQ_NONE;
 
 	/* PIO only */
-	if (status & DIRQ) {
+	if (!is_dma && (status & DIRQ)) {
 		struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
 		u32 *buf = (u32 *)(runtime->dma_area +
 				   rsnd_dai_pointer_offset(io, 0));