From: Thomas Gleixner <tglx@linutronix.de>
Date: Mon, 28 Apr 2014 10:49:43 +0000 (+0000)
Subject: dmaengine: edma: Make reading the position of active channels work
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~69^2~45
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cdae05a0f0f7d15837dfd6f4200e8caea03c9cbf;p=pandora-kernel.git

dmaengine: edma: Make reading the position of active channels work

As Joel pointed out, edma_read_position() uses memcpy_fromio() to read
the parameter ram. That's not synchronized with the internal update as
it does a byte by byte copy. We need to do a 32bit read to get a
consistent value.

Further reading destination and source is pointless. In DEV_TO_MEM
transfers we are only interested in the destination, in MEM_TO_DEV we
care about the source. In MEM_TO_MEM it really does not matter which
one you read.

Simple solution: Remove the pointers, select dest/source via a bool
and return the read value.

Remove the export of this function while at it. The only potential
user is the dmaengine and that's always builtin.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
---

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