evie/android_kernel_oneplus_msm8998
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msm: sps: support using cached write pointer for BAM-to-Sys mode

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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: Yan He <yanhe@codeaurora.org>
This commit is contained in:
Yan He 2015-12-11 18:47:59 -08:00 • committed by David Keitel
parent b12c7d2cd1
commit fedf20a070
2 changed files with 12 additions and 1 deletions
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11
drivers/platform/msm/sps/sps_bam.c
View file

@ -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;

2
include/linux/msm-sps.h
View file

@ -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 */