From: Sean Paul <seanpaul@chromium.org>
Date: Wed, 10 Sep 2014 14:52:03 +0000 (-0400)
Subject: gpu: host1x: mipi: Preserve the contents of MIPI_CAL_CTRL
X-Git-Tag: omap-for-v3.19/fixes-rc1~80^2~61^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=26f7a92a3a275cad7b0f39063e8cd92e002aff1a;p=pandora-kernel.git

gpu: host1x: mipi: Preserve the contents of MIPI_CAL_CTRL

By paving the CTRL reg value, the current code changes MIPI_CAL_PRESCALE
("Auto-cal calibration step prescale") from 1us to 0.1us (val=0). In the
description for PHY's noise filter (MIPI_CAL_NOISE_FLT), the TRM states
that if the value of the prescale is 0 (or 0.1us), the filter should be
set between 2-5. However, the current code sets it to 0.

For now, let's keep the prescale and filter values as-is, which is most
likely the power-on-reset values of 0x2 and 0xa, respectively.

Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
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