c939e5c821
The MPC5200 AC97 driver is disabling the slots when a stop trigger is received, but not reenabling them if the stream is started again without processing the hw_params again. This patch fixes the problem by caching the slot enable bit settings calculated at hw_params time so that they can be reapplied every time the start trigger is received. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Liam Girdwood <lrg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/*
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* Freescale MPC5200 Audio DMA driver
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*/
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#ifndef __SOUND_SOC_FSL_MPC5200_DMA_H__
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#define __SOUND_SOC_FSL_MPC5200_DMA_H__
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#define PSC_STREAM_NAME_LEN 32
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/**
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* psc_ac97_stream - Data specific to a single stream (playback or capture)
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* @active: flag indicating if the stream is active
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* @psc_dma: pointer back to parent psc_dma data structure
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* @bcom_task: bestcomm task structure
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* @irq: irq number for bestcomm task
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* @period_end: physical address of end of DMA region
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* @period_next_pt: physical address of next DMA buffer to enqueue
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* @period_bytes: size of DMA period in bytes
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* @ac97_slot_bits: Enable bits for turning on the correct AC97 slot
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*/
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struct psc_dma_stream {
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struct snd_pcm_runtime *runtime;
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int active;
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struct psc_dma *psc_dma;
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struct bcom_task *bcom_task;
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int irq;
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struct snd_pcm_substream *stream;
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int period_next;
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int period_current;
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int period_bytes;
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int period_count;
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/* AC97 state */
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u32 ac97_slot_bits;
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};
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/**
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* psc_dma - Private driver data
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* @name: short name for this device ("PSC0", "PSC1", etc)
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* @psc_regs: pointer to the PSC's registers
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* @fifo_regs: pointer to the PSC's FIFO registers
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* @irq: IRQ of this PSC
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* @dev: struct device pointer
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* @dai: the CPU DAI for this device
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* @sicr: Base value used in serial interface control register; mode is ORed
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* with this value.
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* @playback: Playback stream context data
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* @capture: Capture stream context data
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*/
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struct psc_dma {
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char name[32];
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struct mpc52xx_psc __iomem *psc_regs;
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struct mpc52xx_psc_fifo __iomem *fifo_regs;
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unsigned int irq;
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struct device *dev;
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spinlock_t lock;
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struct mutex mutex;
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u32 sicr;
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uint sysclk;
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int imr;
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int id;
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unsigned int slots;
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/* per-stream data */
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struct psc_dma_stream playback;
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struct psc_dma_stream capture;
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/* Statistics */
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struct {
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unsigned long overrun_count;
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unsigned long underrun_count;
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} stats;
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};
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/* Utility for retrieving psc_dma_stream structure from a substream */
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inline struct psc_dma_stream *
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to_psc_dma_stream(struct snd_pcm_substream *substream, struct psc_dma *psc_dma)
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{
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if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
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return &psc_dma->capture;
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return &psc_dma->playback;
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}
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int mpc5200_audio_dma_create(struct of_device *op);
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int mpc5200_audio_dma_destroy(struct of_device *op);
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extern struct snd_soc_platform mpc5200_audio_dma_platform;
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#endif /* __SOUND_SOC_FSL_MPC5200_DMA_H__ */
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