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linux/drivers/dma
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Andy Shevchenko 0b23a1ece9 dmaengine: idma64: improve residue estimation 
The residue calculation may provide a wrong estimation when the transfer is
started. There are possible scenarios we have to separate:

	1) the transfer is not started yet; residue is equal to the total
	   length;

	2) the transfer is just started (first chunk is ongoing); residue is
	   equal to the total length without already transfered bytes;

	3) the transfer is ongoing and we already sent few chunks of data;
	   residue is equal to the total length without fully transfered chunks
	   and already sent bytes.

Mistakenly the calculation in cases 2) and 3) was done in the similar way and
the result is equal to -bytes that have been transfered, i.e. quite big since
size_t type can't keep negative values.

Rewrite the calculation algorithm to be one pass and have a correct result.

Besides above in case user asks for a status of the active DMA descriptor
without pausing an ongoing transfer the residue will be estimated based on the
register value, though it's still racy. Since the transfer is active the value
is continuously being changed. Here we have to read two registers at a time. To
minimize an error make those reads close to each other.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2015-09-25 07:51:16 +05:30
..
bestcomm dmaengine: constify of_device_id array 2015-03-18 22:13:14 +05:30
dw dmaengine updates for 4.3-rc1 2015-09-04 11:10:18 -07:00
hsu dmaengine: hsu: remove excessive lock 2015-07-16 18:30:46 +05:30
ioat dmaengine: ioatdma: add Broadwell EP ioatdma PCI dev IDs 2015-08-28 10:06:06 +05:30
ipu dmaengine :ipu: change ipu_irq_handler() to remove compile warning 2015-08-28 10:02:59 +05:30
ppc4xx dmaengine: Remove FSF mailing addresses 2015-03-16 22:28:15 +05:30
sh dmaengine: sort the sh Makefile 2015-08-26 07:50:17 +05:30
xilinx dmaengine: xilinx-dma: move header file to common location 2015-03-17 16:23:21 +05:30
acpi-dma.c resources: Move struct resource_list_entry from ACPI into resource core 2015-02-05 15:09:25 +01:00
amba-pl08x.c dmaengine: pl08x: support dt channel assignment 2015-08-18 22:12:14 +05:30
at_hdmac_regs.h dmaengine updates for 4.3-rc1 2015-09-04 11:10:18 -07:00
at_hdmac.c dmaengine updates for 4.3-rc1 2015-09-04 11:10:18 -07:00
at_xdmac.c dmaengine updates for 4.3-rc1 2015-09-04 11:10:18 -07:00
bcm2835-dma.c dmaengine: bcm2835-dma: Fix memory leak when stopping a running transfer 2015-03-30 23:17:08 +05:30
coh901318_lli.c
coh901318.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
coh901318.h
cppi41.c dmaengine: cppi41: add missing bitfields 2015-04-11 21:12:58 +05:30
dma-axi-dmac.c dmaengine: Add support for the Analog Devices AXI-DMAC DMA controller 2015-08-23 18:55:10 +05:30
dma-jz4740.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
dma-jz4780.c dmaengine: jz4780: Kill tasklets before unregistering the device 2015-08-18 22:28:50 +05:30
dmaengine.c dmaengine: fix balance of privatecnt inc/dec operations 2015-08-17 22:47:43 +05:30
dmaengine.h
dmatest.c kernel/params: constify struct kernel_param_ops uses 2015-05-28 11:32:10 +09:30
edma.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
ep93xx_dma.c dmaengine: ep93xx: Constify platform_device_id 2015-05-04 16:38:55 +05:30
fsl_raid.c dmaengine: fsl_raid: statify fsl_re_chan_probe 2015-04-02 16:11:35 +05:30
fsl_raid.h dmaengine: Driver support for FSL RaidEngine device. 2015-04-02 16:10:27 +05:30
fsl-edma.c dmaengine: fsl-edma: clear pending interrupts on initialization 2015-06-25 09:22:32 +05:30
fsldma.c dmaengine: fsldma: remove the unused variable 2015-01-13 23:58:08 +05:30
fsldma.h dmaengine: fsldma: declare slave capabilities for the generic code 2015-01-13 23:58:08 +05:30
idma64.c dmaengine: idma64: improve residue estimation 2015-09-25 07:51:16 +05:30
idma64.h dmaengine: add a driver for Intel integrated DMA 64-bit 2015-07-28 09:56:17 +01:00
img-mdc-dma.c dmaengine: img-mdc: remove device_alloc_chan_resources handler 2015-03-18 22:44:58 +05:30
imx-dma.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
imx-sdma.c dmaengine: imx-sdma: Check for clk_enable() errors 2015-08-20 10:52:12 +05:30
iop-adma.c drivers/dma/iop-adma: Use dma_alloc_writecombine() kernel-style 2015-08-25 09:59:46 +02:00
k3dma.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
Kconfig dmaengine updates for 4.3-rc1 2015-09-04 11:10:18 -07:00
lpc18xx-dmamux.c dmaengine: add driver for lpc18xx dmamux 2015-08-18 22:12:14 +05:30
Makefile dmaengine updates for 4.3-rc1 2015-09-04 11:10:18 -07:00
mic_x100_dma.c x86/mm: Decouple <linux/vmalloc.h> from <asm/io.h> 2015-06-03 12:02:00 +02:00
mic_x100_dma.h dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
mmp_pdma.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
mmp_tdma.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
moxart-dma.c dmaengine: moxart-dma: Fix memory leak when stopping a running transfer 2015-03-30 23:17:08 +05:30
mpc512x_dma.c dmaengine: constify of_device_id array 2015-03-18 22:13:14 +05:30
mv_xor.c dmaengine updates for 4.3-rc1 2015-09-04 11:10:18 -07:00
mv_xor.h dmaengine: mv_xor: improve descriptors list handling and reduce locking 2015-06-10 22:18:31 +05:30
mxs-dma.c dmaengine: mxs: Constify platform_device_id 2015-05-04 16:38:55 +05:30
nbpfaxi.c dmaengine: nbpfaxi: Constify platform_device_id 2015-05-04 16:38:55 +05:30
of-dma.c dmaengine: of_dma: Support for DMA routers 2015-05-09 17:11:25 +05:30
omap-dma.c Merge branch 'topic/omap' into for-linus 2015-06-25 09:21:43 +05:30
pch_dma.c dmaengine: Remove remaining FSF mailing addresses 2015-07-06 19:18:53 +05:30
pl330.c dmaengine updates for 4.3-rc1 2015-09-04 11:10:18 -07:00
pxa_dma.c dmaengine: pxa_dma: fix initial list move 2015-09-25 07:21:01 +05:30
qcom_bam_dma.c Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma 2015-04-24 09:49:37 -07:00
s3c24xx-dma.c dmaengine: s3c24xx: Constify platform_device_id 2015-05-04 16:38:55 +05:30
sa11x0-dma.c dmaengine: sa11x0: report slave capabilities to upper layers 2015-04-17 23:24:35 +05:30
sirf-dma.c dmaengine: sirf: clear pending DMA interrupt when DMA terminates 2015-08-18 22:13:59 +05:30
ste_dma40_ll.c
ste_dma40_ll.h
ste_dma40.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
sun4i-dma.c dmaengine: sun4i: Add support for the DMA engine on sun[457]i SoCs 2015-08-20 10:45:19 +05:30
sun6i-dma.c dmaengine: Add an enum for the dmaengine alignment constraints 2015-08-05 10:53:52 +05:30
tegra20-apb-dma.c dmaengine: tegra-apb: Simplify locking for device using global pause 2015-08-20 12:10:25 +05:30
ti-dma-crossbar.c dmaengine: ti-dma-crossbar: Fix checking return value of devm_ioremap_resource 2015-08-05 10:40:06 +05:30
timb_dma.c dmaengine: Remove remaining FSF mailing addresses 2015-07-06 19:18:53 +05:30
TODO
txx9dmac.c dmaengine: txx9: Rename device_control 2014-12-22 12:33:22 +05:30
txx9dmac.h MIPS: Replace MIPS-specific 64BIT_PHYS_ADDR with generic PHYS_ADDR_T_64BIT 2014-11-24 22:46:44 +01:00
virt-dma.c Revert "dmaengine: virt-dma: don't always free descriptor upon completion" 2015-07-31 20:33:43 +05:30
virt-dma.h Revert "dmaengine: virt-dma: don't always free descriptor upon completion" 2015-07-31 20:33:43 +05:30
xgene-dma.c dmaengine: xgene-dma: fix handling xgene_dma_get_ring_size result 2015-09-25 07:38:10 +05:30
zx296702_dma.c dmaengine: zxdma: Fix force stop bug 2015-08-05 11:03:23 +05:30