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linux/drivers/dma
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Sugar Zhang 6a0cd6ef6d dmaengine: pl330: Improve dma cyclic transfers efficiency 
Currently, the driver implements cyclic transfers by desc list.
Each desc describes one period and started by CPU after last
one done(tasklet), which maybe delayed due to schedule or
heavy system load, which will cause device FIFO xrun.

Now, We introduced infinitely cyclic without CPU intervention
to fix this case: each period buffer elapsed, just throwing one
irq to CPU, and keep going transfer without CPU.

e.g. aplay with period-size: 1024, buffer-size: 4096

/# aplay -D hw:0,0 --period-size=1024 --buffer-size=4096 -r 48000
-c 2 -f s16_le /dev/zero

Dump MCGEN:

+ #define PL330_DEBUG_MCGEN

Before:

 916000:  DMAMOV CCR 0x9d0275
 916006:  DMAMOV SAR 0xa34000
 91600c:  DMAMOV DAR 0xffae8030
 916012:  DMALP_1 127
 916014:  DMAFLUSHP 22
 916016:  DMAWFPB 22
 916018:  DMALDB
 916019:  DMASTPB 22
 91601b:  DMALPENDA_1 bjmpto_7
 91601d:  DMASEV 0
 91601f:  DMAEND

 916100:  DMAMOV CCR 0x9d0275
 916106:  DMAMOV SAR 0xa35000
 91610c:  DMAMOV DAR 0xffae8030
 916112:  DMALP_1 127
 916114:  DMAFLUSHP 22
 916116:  DMAWFPB 22
 916118:  DMALDB
 916119:  DMASTPB 22
 91611b:  DMALPENDA_1 bjmpto_7
 91611d:  DMASEV 0
 91611f:  DMAEND

 916000:  DMAMOV CCR 0x9d0275
 916006:  DMAMOV SAR 0xa36000
 91600c:  DMAMOV DAR 0xffae8030
 916012:  DMALP_1 127
 916014:  DMAFLUSHP 22
 916016:  DMAWFPB 22
 916018:  DMALDB
 916019:  DMASTPB 22
 91601b:  DMALPENDA_1 bjmpto_7
 91601d:  DMASEV 0
 91601f:  DMAEND

 916100:  DMAMOV CCR 0x9d0275
 916106:  DMAMOV SAR 0xa37000
 91610c:  DMAMOV DAR 0xffae8030
 916112:  DMALP_1 127
 916114:  DMAFLUSHP 22
 916116:  DMAWFPB 22
 916118:  DMALDB
 916119:  DMASTPB 22
 91611b:  DMALPENDA_1 bjmpto_7
 91611d:  DMASEV 0
 91611f:  DMAEND

 916000:  DMAMOV CCR 0x9d0275
 916006:  DMAMOV SAR 0xa34000
 91600c:  DMAMOV DAR 0xffae8030
 916012:  DMALP_1 127
 916014:  DMAFLUSHP 22
 916016:  DMAWFPB 22
 916018:  DMALDB
 916019:  DMASTPB 22
 91601b:  DMALPENDA_1 bjmpto_7
 91601d:  DMASEV 0
 91601f:  DMAEND

 ...

After:

 916000:  DMAMOV CCR 0x9d0275
 916006:  DMAMOV SAR 0xa34000
 91600c:  DMAMOV DAR 0xffae8030
 916012:  DMALP_0 3
 916014:  DMALP_1 127
 916016:  DMAFLUSHP 22
 916018:  DMAWFPB 22
 91601a:  DMALDB
 91601b:  DMASTPB 22
 91601d:  DMALPENDA_1 bjmpto_7
 91601f:  DMASEV 0
 916021:  DMALPENDA_0 bjmpto_d
 916023:  DMALPFEA_1 bjmpto_1d

Change-Id: Ibbc92c416d0a9dd58633e7991176c86300c3da98
Signed-off-by: Huibin Hong <huibin.hong@rock-chips.com>
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
2022-04-27 16:37:01 +08:00
..
bestcomm treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
dw dmaengine: dw: Make it dependent to HAS_IOMEM 2021-04-21 13:00:50 +02:00
dw-axi-dmac dmaengine: virt-dma: Add missing locking 2019-12-26 10:04:18 +05:30
dw-edma dmaengine: dw-edma: Fix crash on loading/unloading driver 2021-05-22 11:40:52 +02:00
fsl-dpaa2-qdma dmaengine: fsl-dpaa2-qdma: Fix error return code in two functions 2021-06-23 14:42:40 +02:00
hsu dmaengine: hsu: disable spurious interrupt 2021-03-04 11:37:55 +01:00
idxd dmaengine: idxd: add missing dsa driver unregister 2021-06-23 14:42:40 +02:00
ioat dmaengine: ioatdma: remove unused function missed during dma_v2 removal 2020-11-16 22:42:28 +05:30
ipu dmaengine: ipu: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
mediatek dmaengine: mediatek: use GFP_NOWAIT instead of GFP_ATOMIC in prep_dma 2021-06-30 08:47:20 -04:00
ppc4xx dmaengine: ppc4xx: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
qcom dmaengine: QCOM_HIDMA_MGMT depends on HAS_IOMEM 2021-06-23 14:42:40 +02:00
sf-pdma dmaengine: SF_PDMA depends on HAS_IOMEM 2021-06-23 14:42:40 +02:00
sh dmaengine: usb-dmac: Fix PM reference leak in usb_dmac_probe() 2021-08-26 08:35:35 -04:00
ti dmaengine: ti: k3-udma: Correct normal channel offset when uchan_cnt is not 0 2020-12-30 11:53:51 +01:00
xilinx dmaengine: xilinx_dma: Fix read-after-free bug when terminating transfers 2021-08-26 08:35:35 -04:00
acpi-dma.c dmaengine: acpi: Put the CSRT table after using it 2020-08-17 10:21:37 +05:30
altera-msgdma.c dmaengine: altera-msgdma: fix kernel-doc style for tasklet 2020-10-08 15:18:37 +05:30
amba-pl08x.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
at_hdmac_regs.h dmaengine: at_hdmac: Replace zero-length array with flexible-array 2020-05-13 20:25:16 +05:30
at_hdmac.c dmaengine: at_hdmac: convert tasklets to use new tasklet_setup() API 2020-09-18 12:18:11 +05:30
at_xdmac.c dmaengine: at_xdmac: convert tasklets to use new tasklet_setup() API 2020-09-18 12:18:11 +05:30
bcm-sba-raid.c dmaengine: bcm-sba-raid: Replace zero-length array with flexible-array member 2020-02-13 20:15:35 +05:30
bcm2835-dma.c dmaengine: bcm2835: Drop local dma_parms 2020-09-11 17:42:12 +05:30
coh901318_lli.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
coh901318.c dmaengine: coh901318: convert tasklets to use new tasklet_setup() API 2020-09-18 12:18:11 +05:30
coh901318.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
dma-axi-dmac.c dmaengine: axi-dmac: Drop local dma_parms 2020-09-11 17:42:12 +05:30
dma-jz4780.c dmaengine: dma-jz4780: Fix race in jz4780_dma_tx_status 2020-10-05 09:58:48 +05:30
dmaengine.c dmaengine: Fix a double free in dma_async_device_register 2021-04-21 13:00:50 +02:00
dmaengine.h dmaengine: Create debug directories for DMA devices 2020-03-11 14:56:14 +05:30
dmatest.c dmaengine: dmatest: Return boolean result directly in filter() 2020-09-22 20:18:41 +05:30
ep93xx_dma.c dmaengine: ep93xx: convert tasklets to use new tasklet_setup() API 2020-09-18 12:18:11 +05:30
fsl_raid.c dmaengine: fsl: remove bad channel update 2020-10-05 09:59:17 +05:30
fsl_raid.h dmaengine: Driver support for FSL RaidEngine device. 2015-04-02 16:10:27 +05:30
fsl-edma-common.c dmaengine: fsl-edma: fix wrong tcd endianness for big-endian cpu 2020-07-06 14:49:22 +05:30
fsl-edma-common.h dmaengine: fsl-edma-common: correct DSIZE_32BYTE 2020-07-06 10:24:49 +05:30
fsl-edma.c dmaengine: fsl-edma: Fix NULL pointer exception in fsl_edma_tx_handler 2020-06-24 13:05:01 +05:30
fsl-qdma.c dmaengine: fsl-qdma: check dma_set_mask return value 2021-07-20 16:05:38 +02:00
fsldma.c dmaengine: fsldma: Fix a resource leak in an error handling path of the probe function 2021-03-04 11:37:55 +01:00
fsldma.h fsldma: fix very broken 32-bit ppc ioread64 functionality 2020-08-29 13:50:56 -07:00
hisi_dma.c dmaengine: hisilicon: Use struct_size() in devm_kzalloc() 2020-06-24 11:26:23 +05:30
idma64.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
idma64.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
img-mdc-dma.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 422 2019-06-05 17:37:15 +02:00
imx-dma.c dmaengine: imx-dma: configure the generic DMA type to make it work 2021-08-12 13:22:05 +02:00
imx-sdma.c dmaengine: imx-sdma: Drop local dma_parms 2020-09-11 17:42:13 +05:30
iop-adma.c Merge branch 'topic/tasklet' into next 2020-10-01 10:18:59 +05:30
iop-adma.h treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
k3dma.c dmaengine: k3dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
Kconfig dmaengine: xilinx: dpdma: Add missing dependencies to Kconfig 2021-06-30 08:47:18 -04:00
lpc18xx-dmamux.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
Makefile misc: mic: remove the MIC drivers 2020-10-28 19:12:03 +01:00
mcf-edma.c dmaengine: mcf-edma: Fix NULL pointer exception in mcf_edma_tx_handler 2020-06-24 13:06:15 +05:30
milbeaut-hdmac.c dmaengine: Replace zero-length array with flexible-array 2020-06-15 23:08:30 -05:00
milbeaut-xdmac.c dmaengine: milbeaut-xdmac: Fix a resource leak in the error handling path of the probe function 2021-01-17 14:17:02 +01:00
mmp_pdma.c dmaengine: mmp: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
mmp_tdma.c dmaengine: mmp: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
moxart-dma.c dmaengine: Replace zero-length array with flexible-array 2020-06-15 23:08:30 -05:00
mpc512x_dma.c dmaengine: mpc512x: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
mv_xor_v2.c dmaengine: mv_xor_v2: Fix error return code in mv_xor_v2_probe() 2020-12-30 11:53:21 +01:00
mv_xor.c dmaengine: mv_xor: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
mv_xor.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288 2019-06-05 17:36:37 +02:00
mxs-dma.c dmaengine: mxs-dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
nbpfaxi.c dmaengine: nbpfaxi: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
of-dma.c dmaengine: of-dma: router_xlate to return -EPROBE_DEFER if controller is not yet available 2021-08-26 08:35:36 -04:00
owl-dma.c dmaengine: owl-dma: Fix a resource leak in the remove function 2021-03-04 11:37:55 +01:00
pch_dma.c dmaengine: pch_dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:06 +05:30
pl330.c dmaengine: pl330: Improve dma cyclic transfers efficiency 2022-04-27 16:37:01 +08:00
plx_dma.c dmaengine: plx_dma: add a missing put_device() on error path 2021-04-21 13:00:51 +02:00
pxa_dma.c dmaengine updates for v5.3-rc1 2019-07-17 09:55:43 -07:00
s3c24xx-dma.c dmaengine: s3c24xx-dma: fix spelling mistake "to" -> "too" 2020-01-23 17:03:25 +05:30
sa11x0-dma.c dmaengine: sa11x0: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
sirf-dma.c dmaengine: sirf-dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
sprd-dma.c dmaengine: sprd: Set request pending flag when DMA controller is active 2020-03-23 11:38:24 +05:30
st_fdma.c iov_iter: Move unnecessary inclusion of crypto/hash.h 2020-06-30 09:34:23 -04:00
st_fdma.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ste_dma40_ll.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
ste_dma40_ll.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194 2019-05-30 11:29:22 -07:00
ste_dma40.c dmaengine: stedma40: add missing iounmap() on error in d40_probe() 2021-06-23 14:42:40 +02:00
stm32-dma.c dmaengine: stm32-dma: Fix PM usage counter imbalance in stm32 dma ops 2021-08-12 13:22:04 +02:00
stm32-dmamux.c dmaengine: stm32-dmamux: Fix PM usage counter unbalance in stm32 dmamux ops 2021-08-12 13:22:04 +02:00
stm32-mdma.c dmaengine: stm32-mdma: fix PM reference leak in stm32_mdma_alloc_chan_resourc() 2021-06-30 08:47:18 -04:00
sun4i-dma.c dmaengine: sun4i-dma: Demote obvious misuse of kerneldoc to standard comment blocks 2020-07-15 17:50:47 +05:30
sun6i-dma.c dmaengine: sun6i: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
tegra20-apb-dma.c dmaengine: tegra20: Fix runtime PM imbalance on error 2021-04-28 13:40:01 +02:00
tegra210-adma.c dmaengine: tegra210-adma: Fix runtime PM imbalance on error 2020-06-24 15:11:39 +05:30
timb_dma.c dmaengine: timb_dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
TODO dmaengine: dw: don't perform DMA when dmaengine_submit is called 2014-07-15 22:14:30 +05:30
txx9dmac.c dmaengine: txx9dmac: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
txx9dmac.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
uniphier-mdmac.c dmaengine: uniphier-mdmac: replace zero-length array with flexible-array member 2020-02-13 20:15:57 +05:30
uniphier-xdmac.c dmaengine: uniphier-xdmac: Use readl_poll_timeout_atomic() in atomic state 2021-08-12 13:22:03 +02:00
virt-dma.c dmaengine: virt-dma: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
virt-dma.h dmaengine: virt-dma: Add missing locking around list operations 2019-12-26 10:04:18 +05:30
xgene-dma.c dmaengine: xgene: convert tasklets to use new tasklet_setup() API 2020-09-18 12:19:07 +05:30
zx_dma.c dmaengine: zx: remove redundant irqsave in hardIRQ 2020-09-18 12:30:50 +05:30