Sekhar Nori 5fc68a6cad dma: edma: fix incorrect SG list handling ...

The code to handle any length SG lists calls edma_resume()
even before edma_start() is called. This is incorrect
because edma_resume() enables edma events on the channel
after which CPU (in edma_start) cannot clear posted
events by writing to ECR (per the EDMA user's guide).

Because of this EDMA transfers fail to start if due
to some reason there is a pending EDMA event registered
even before EDMA transfers are started. This can happen if
an EDMA event is a byproduct of device initialization.

Fix this by calling edma_resume() only if it is not the
first batch of MAX_NR_SG elements.

Without this patch, MMC/SD fails to function on DA850 EVM
with DMA. The behaviour is triggered by specific IP and
this can explain why the issue was not reported before
(example with MMC/SD on AM335x).

Tested on DA850 EVM and AM335x EVM-SK using MMC/SD card.

Cc: stable@vger.kernel.org # v3.12.x+
Cc: Joel Fernandes <joelf@ti.com>
Acked-by: Joel Fernandes <joelf@ti.com>
Tested-by: Jon Ringle <jringle@gridpoint.com>
Tested-by: Alexander Holler <holler@ahsoftware.de>
Reported-by: Jon Ringle <jringle@gridpoint.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

2014-04-14 09:29:55 +05:30

..

bestcomm

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dw

dma: dw: Add suspend and resume handling for PCI mode DW_DMAC.

2014-03-26 11:52:03 +05:30

ioat

ioat: fix tasklet tear down

2014-02-25 09:44:20 -08:00

ipu

dmaengine: ipu: fix warnings from 64-bit dma_addr_t printouts

2013-11-13 14:10:48 +05:30

ppc4xx

Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma

2014-01-29 20:27:23 -08:00

sh

shdma: add R-Car Audio DMAC peri peri driver

2014-03-29 19:38:09 +05:30

acpi-dma.c

acpi-dma: convert to return error code when asked for channel

2014-02-11 23:30:50 +05:30

amba-pl08x.c

dma: pl08x: Export pl08x_filter_id

2014-01-28 08:45:54 +05:30

at_hdmac_regs.h

dmaengine: at_hdmac: remove unused function

2013-12-12 22:43:41 -08:00

at_hdmac.c

dmaengine: at_hdmac: use tasklet_kill in teardown

2014-03-17 18:33:43 +05:30

bcm2835-dma.c

dmaengine: Add DMA_PRIVATE to BCM2835 driver

2014-01-20 12:31:50 +05:30

coh901318_lli.c

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coh901318.c

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coh901318.h

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cppi41.c

dma: cppi41: start tear down only if channel is busy

2014-03-11 16:22:43 +05:30

dma-jz4740.c

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dmaengine.c

acpi-dma: convert to return error code when asked for channel

2014-02-11 23:30:50 +05:30

dmaengine.h

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dmatest.c

Add new line to test result strings produced in verbose mode

2014-03-26 11:41:45 +05:30

edma.c

dma: edma: fix incorrect SG list handling

2014-04-14 09:29:55 +05:30

ep93xx_dma.c

dmaengine: remove DMA unmap from drivers

2013-11-14 11:04:38 -08:00

fsl-edma.c

dma: fsl-edma: fix static checker warning of NULL dereference

2014-03-06 20:43:57 +05:30

fsldma.c

dma: fix fsldma build warnings

2013-12-12 22:43:41 -08:00

fsldma.h

DMA: Freescale: change BWC from 256 bytes to 1024 bytes

2014-01-20 13:13:22 +05:30

imx-dma.c

dma: imx-dma: Add missing module owner field

2014-03-06 20:51:09 +05:30

imx-sdma.c

dma: sdma: Add imx25 compatible

2014-02-18 17:10:49 +05:30

intel_mid_dma_regs.h

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intel_mid_dma.c

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iop-adma.c

Merge commit 'dmaengine-3.13-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/dmaengine

2013-11-16 12:02:36 +05:30

iovlock.c

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k3dma.c

dmaengine: k3dma: fix sparse warnings

2014-01-20 13:53:20 +05:30

Kconfig

Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma

2014-04-10 08:55:08 -07:00

Makefile

dmaengine: add Qualcomm BAM dma driver

2014-04-05 20:44:26 +05:30

mmp_pdma.c

dma: mmp_pdma: add IRQF_SHARED when request irq

2014-03-06 14:47:47 +05:30

mmp_tdma.c

dma: mmp_tdma: move to generic device tree binding

2014-03-06 14:49:54 +05:30

moxart-dma.c

dmaengine: Add MOXA ART DMA engine driver

2014-01-20 12:32:46 +05:30

mpc512x_dma.c

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mv_xor.c

dma: mv_xor: Silence a bunch of LPAE-related warnings

2014-02-12 16:21:17 -08:00

mv_xor.h

dma: mv_xor: Fix mis-usage of mmio 'base' and 'high_base' registers

2013-11-14 11:04:42 -08:00

mxs-dma.c

dma: mxs-dma: Use semaphores for cyclic DMA

2013-11-13 15:38:31 +05:30

of-dma.c

dma: add channel request API that supports deferred probe

2013-12-10 17:46:48 +05:30

omap-dma.c

Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma

2014-04-10 08:55:08 -07:00

pch_dma.c

dmaengine: pch_dma: use tasklet_kill in teardown

2014-03-17 18:34:11 +05:30

pl330.c

Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma

2014-01-29 20:27:23 -08:00

qcom_bam_dma.c

dmaengine: add Qualcomm BAM dma driver

2014-04-05 20:44:26 +05:30

s3c24xx-dma.c

dmaengine: s3c24xx-dma: make phy->irq signed for error handling

2014-03-11 14:23:18 +05:30

sa11x0-dma.c

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sirf-dma.c

dmaengine: sirf: enable generic dt binding for dma channels

2014-03-29 19:20:13 +05:30

ste_dma40_ll.c

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ste_dma40_ll.h

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ste_dma40.c

dma: ste_dma40: don't dereference free:d descriptor

2014-02-17 14:06:58 +05:30

tegra20-apb-dma.c

Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma

2014-01-29 20:27:23 -08:00

timb_dma.c

dmaengine: remove DMA unmap from drivers

2013-11-14 11:04:38 -08:00

TODO

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txx9dmac.c

dma: fix build warnings in txx9

2013-12-12 22:43:41 -08:00

txx9dmac.h

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virt-dma.c

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virt-dma.h

dma: fix vchan_cookie_complete() debug print

2014-01-26 17:33:45 +05:30