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ASoC: omap-mcpdm: API to configure offset cancellation

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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>
This commit is contained in:
Peter Ujfalusi 2011-09-26 16:05:58 +03:00 committed by Mark Brown
parent db4aabcc1f
commit 89b0d550a6
2 changed files with 37 additions and 0 deletions
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25
sound/soc/omap/omap-mcpdm.c
View File

@ -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)
@ -418,6 +434,15 @@ 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;

12
sound/soc/omap/omap-mcpdm.h
View File

@ -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__ */