ASoC: omap-mcpdm: API to configure offset cancellation
The offset cancellation values can be different from board to board, even
on the same HW platform.
Provide a way for the machine drivers to configure the McPDM offset
cancellation.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/sound/soc/omap/omap-mcpdm.c b/sound/soc/omap/omap-mcpdm.c
index 2c9fa51..41d1706 100644
--- a/sound/soc/omap/omap-mcpdm.c
+++ b/sound/soc/omap/omap-mcpdm.c
@@ -59,6 +59,9 @@
/* McPDM FIFO thresholds */
u32 dn_threshold;
u32 up_threshold;
+
+ /* McPDM dn offsets for rx1, and 2 channels */
+ u32 dn_rx_offset;
};
/*
@@ -183,6 +186,15 @@
MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL |
MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
+ /* Enable DN RX1/2 offset cancellation feature, if configured */
+ if (mcpdm->dn_rx_offset) {
+ u32 dn_offset = mcpdm->dn_rx_offset;
+
+ omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
+ dn_offset |= (MCPDM_DN_OFST_RX1_EN | MCPDM_DN_OFST_RX2_EN);
+ omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
+ }
+
omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_DN, mcpdm->dn_threshold);
omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_UP, mcpdm->up_threshold);
@@ -209,6 +221,10 @@
/* Disable DMA request generation for uplink */
omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_UP_ENABLE);
+
+ /* Disable RX1/2 offset cancellation */
+ if (mcpdm->dn_rx_offset)
+ omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, 0);
}
static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
@@ -418,6 +434,15 @@
.ops = &omap_mcpdm_dai_ops,
};
+void omap_mcpdm_configure_dn_offsets(struct snd_soc_pcm_runtime *rtd,
+ u8 rx1, u8 rx2)
+{
+ struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
+
+ mcpdm->dn_rx_offset = MCPDM_DNOFST_RX1(rx1) | MCPDM_DNOFST_RX2(rx2);
+}
+EXPORT_SYMBOL_GPL(omap_mcpdm_configure_dn_offsets);
+
static __devinit int asoc_mcpdm_probe(struct platform_device *pdev)
{
struct omap_mcpdm *mcpdm;
diff --git a/sound/soc/omap/omap-mcpdm.h b/sound/soc/omap/omap-mcpdm.h
index d23122a..de8cf26 100644
--- a/sound/soc/omap/omap-mcpdm.h
+++ b/sound/soc/omap/omap-mcpdm.h
@@ -92,4 +92,16 @@
#define MCPDM_UP_THRES_MAX 0xF
#define MCPDM_DN_THRES_MAX 0xF
+/*
+ * MCPDM_DN_OFFSET bit fields
+ */
+
+#define MCPDM_DN_OFST_RX1_EN (1 << 0)
+#define MCPDM_DNOFST_RX1(x) ((x & 0x1f) << 1)
+#define MCPDM_DN_OFST_RX2_EN (1 << 8)
+#define MCPDM_DNOFST_RX2(x) ((x & 0x1f) << 9)
+
+void omap_mcpdm_configure_dn_offsets(struct snd_soc_pcm_runtime *rtd,
+ u8 rx1, u8 rx2);
+
#endif /* End of __OMAP_MCPDM_H__ */