From: Doug Anderson <dianders@chromium.org>
Date: Tue, 11 Jun 2013 15:24:05 +0000 (-0700)
Subject: clk: samsung: Fix pll36xx_recalc_rate to handle kdiv properly
X-Git-Tag: v3.10-rc7~30^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=071ff9a36cb08b5a2b099fcdb45b63a61618f928;p=pandora-kernel.git

clk: samsung: Fix pll36xx_recalc_rate to handle kdiv properly

The KDIV value is often listed as unsigned but it needs to be treated
as a 16-bit signed value when using it in calculations.  Fix our rate
recalculation to do this correctly.

Before doing this, I tried setting EPLL on exynos5250 to:
  rate, m, p, s, k = 80000000, 107, 2, 4, 43691

This rate is exactly from the table in the exynos5250 user manual.

I read this back as 80750003 with:
  cat /sys/kernel/debug/clk/fin_pll/fout_epll/clk_rate

After this patch, it reads back as 80000003

Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Reviewed-by: Vikas Sajjan <vikas.sajjan@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
---

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