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Commit 999a633c authored by Yan He's avatar Yan He
Browse files

msm: sps: support using cached write pointer for BAM-to-Sys mode 



Support using the cached write pointer for a BAM-to-Sys mode BAM
pipe when check if the desc FIFO of that pipe is full.

Change-Id: Ie480ecca9eff76388c504665b496e01bbf3e009f
Signed-off-by: default avatarYan He <yanhe@codeaurora.org>
parent 22772af9

drivers/platform/msm/sps/sps_bam.c

+10 −1
Original line number Diff line number Diff line
@@ -2402,7 +2402,16 @@ int sps_bam_pipe_get_unused_desc_num(struct sps_bam *dev, u32 pipe_index, 
	fifo_size = pipe->desc_size;



	sw_offset = bam_pipe_get_desc_read_offset(&dev->base, pipe_index);

	peer_offset = bam_pipe_get_desc_write_offset(&dev->base, pipe_index);

	if ((dev->props.options & SPS_BAM_CACHED_WP) &&

		!(pipe->state & BAM_STATE_BAM2BAM)) {

		peer_offset = pipe->sys.desc_offset;

		SPS_DBG(dev,

			"sps:BAM %pa pipe %d: peer offset in cache:0x%x\n",

			BAM_ID(dev), pipe_index, peer_offset);

	} else {

		peer_offset = bam_pipe_get_desc_write_offset(&dev->base,

				pipe_index);

	}



	if (sw_offset <= peer_offset)

		*desc_num = (peer_offset - sw_offset) / desc_size;

include/linux/msm-sps.h

+2 −0
Original line number Diff line number Diff line
@@ -115,6 +115,8 @@ 
#define SPS_BAM_RES_CONFIRM         (1UL << 7)

/* Hold memory for BAM DMUX */

#define SPS_BAM_HOLD_MEM            (1UL << 8)

/* Use cached write pointer */

#define SPS_BAM_CACHED_WP           (1UL << 10)



/* BAM device management flags */