From: Jay Cornwall <jay.cornwall@amd.com>
Date: Mon, 19 Jan 2015 17:47:34 +0000 (-0600)
Subject: drm/amdkfd: Preserve CP_MQD_IQ_RPTR internal state
X-Git-Tag: omap-for-v4.1/prcm-dts-mfd-syscon-fix~75^2~7^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d752f95e55ed36648fc2bcbca348f5113920c357;p=pandora-kernel.git

drm/amdkfd: Preserve CP_MQD_IQ_RPTR internal state

CP microcode uses undocumented bits in this register to record queue
state information. The KFD zeroes these bits in update_mqd, when invoked
through the UPDATE_QUEUE ioctl, causing incoherent state when the ioctl
is used to successively unmap and map a queue.

Since the queue type cannot be changed in this path, move the MQD write
to init_mqd.

Signed-off-by: Jay Cornwall <jay.cornwall@amd.com>
Reviewed-by: Ben Goz <ben.goz@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
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