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 --- sound/soc/omap/omap-mcpdm.c | 25 +++++++++++++++++++++++++ sound/soc/omap/omap-mcpdm.h | 12 ++++++++++++ 2 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/sound/soc/omap/omap-mcpdm.c b/sound/soc/omap/omap-mcpdm.c index 159a5e9..23eaacb 100644 --- a/sound/soc/omap/omap-mcpdm.c +++ b/sound/soc/omap/omap-mcpdm.c @@ -59,6 +59,9 @@ struct omap_mcpdm { /* 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 @@ static void omap_mcpdm_open_streams(struct omap_mcpdm *mcpdm) 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 @@ static void omap_mcpdm_close_streams(struct omap_mcpdm *mcpdm)
/* 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) @@ -416,6 +432,15 @@ static struct snd_soc_dai_driver omap_mcpdm_dai = { .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__ */