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ASoC: davinci-mcasp: Simplify and clean up the AFIFO configuration code 

We can have more linear code flow by using variables in
mcasp_common_hw_param() related to the AFIFO configuration.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Peter Ujfalusi 2014-04-01 15:55:09 +03:00 committed by Mark Brown
parent f5b02b4a2c
commit 0bf0e8aece
2 changed files with 25 additions and 24 deletions
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48
sound/soc/davinci/davinci-mcasp.c
View File

@ -37,6 +37,8 @@
#include "davinci-pcm.h"
#include "davinci-mcasp.h"
#define MCASP_MAX_AFIFO_DEPTH 64
struct davinci_mcasp_context {
u32 txfmtctl;
u32 rxfmtctl;
@ -469,9 +471,9 @@ static int mcasp_common_hw_param(struct davinci_mcasp *mcasp, int stream,
int i;
u8 tx_ser = 0;
u8 rx_ser = 0;
u8 ser;
u8 slots = mcasp->tdm_slots;
u8 max_active_serializers = (channels + slots - 1) / slots;
u8 active_serializers, numevt;
u32 reg;
/* Default configuration */
if (mcasp->version != MCASP_VERSION_4)
@ -505,36 +507,34 @@ static int mcasp_common_hw_param(struct davinci_mcasp *mcasp, int stream,
}
}
if (stream == SNDRV_PCM_STREAM_PLAYBACK)
ser = tx_ser;
else
ser = rx_ser;
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
active_serializers = tx_ser;
numevt = mcasp->txnumevt;
reg = mcasp->fifo_base + MCASP_WFIFOCTL_OFFSET;
} else {
active_serializers = rx_ser;
numevt = mcasp->rxnumevt;
reg = mcasp->fifo_base + MCASP_RFIFOCTL_OFFSET;
}
if (ser < max_active_serializers) {
if (active_serializers < max_active_serializers) {
dev_warn(mcasp->dev, "stream has more channels (%d) than are "
"enabled in mcasp (%d)\n", channels, ser * slots);
"enabled in mcasp (%d)\n", channels,
active_serializers * slots);
return -EINVAL;
}
if (mcasp->txnumevt && stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (mcasp->txnumevt * tx_ser > 64)
mcasp->txnumevt = 1;
/* AFIFO is not in use */
if (!numevt)
return 0;
reg = mcasp->fifo_base + MCASP_WFIFOCTL_OFFSET;
mcasp_mod_bits(mcasp, reg, tx_ser, NUMDMA_MASK);
mcasp_mod_bits(mcasp, reg, ((mcasp->txnumevt * tx_ser) << 8),
NUMEVT_MASK);
}
if (numevt * active_serializers > MCASP_MAX_AFIFO_DEPTH)
numevt = active_serializers;
if (mcasp->rxnumevt && stream == SNDRV_PCM_STREAM_CAPTURE) {
if (mcasp->rxnumevt * rx_ser > 64)
mcasp->rxnumevt = 1;
reg = mcasp->fifo_base + MCASP_RFIFOCTL_OFFSET;
mcasp_mod_bits(mcasp, reg, rx_ser, NUMDMA_MASK);
mcasp_mod_bits(mcasp, reg, ((mcasp->rxnumevt * rx_ser) << 8),
NUMEVT_MASK);
}
/* Configure the AFIFO */
numevt *= active_serializers;
mcasp_mod_bits(mcasp, reg, active_serializers, NUMDMA_MASK);
mcasp_mod_bits(mcasp, reg, NUMEVT(numevt), NUMEVT_MASK);
return 0;
}

1
sound/soc/davinci/davinci-mcasp.h
View File

@ -283,6 +283,7 @@
*/
#define FIFO_ENABLE BIT(16)
#define NUMEVT_MASK (0xFF << 8)
#define NUMEVT(x) (((x) & 0xFF) << 8)
#define NUMDMA_MASK (0xFF)
#endif /* DAVINCI_MCASP_H */