From: 21cnbao@gmail.com (Barry Song)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 7/7] clk: atlas7: fix pll missed divide NR in fraction mode
Date: Tue, 28 Jul 2015 06:27:25 +0000 [thread overview]
Message-ID: <1438064845-17894-8-git-send-email-21cnbao@gmail.com> (raw)
In-Reply-To: <1438064845-17894-1-git-send-email-21cnbao@gmail.com>
From: Guo Zeng <guo.zeng@csr.com>
PLL VCO frequency is given by Fvco = Fref * 2 * NF / NR
in integer-N mode, or by Fvco = Fref * SSN / NR in Spread
Spectrum (fractional-N) mode. Thus fix the missing part
of NR
Signed-off-by: Guo Zeng <guo.zeng@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
---
drivers/clk/sirf/clk-atlas7.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/clk/sirf/clk-atlas7.c b/drivers/clk/sirf/clk-atlas7.c
index 4fc33da..19f417c 100644
--- a/drivers/clk/sirf/clk-atlas7.c
+++ b/drivers/clk/sirf/clk-atlas7.c
@@ -358,6 +358,7 @@ static unsigned long pll_clk_recalc_rate(struct clk_hw *hw,
if (regctrl0 & SIRFSOC_ABPLL_CTRL0_SSEN) {
rate = fin;
rate *= 1 << 24;
+ do_div(rate, nr);
do_div(rate, (256 * ((ssdiv >> ssdepth) << ssdepth)
+ (ssmod << ssdepth)));
} else {
--
1.9.1
next prev parent reply other threads:[~2015-07-28 6:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-28 6:27 [PATCH 0/7] clk: atlas7: a bind of fixes Barry Song
2015-07-28 6:27 ` [PATCH 1/7] clk: atlas7: add lost pwm unit clks Barry Song
2015-07-28 6:27 ` [PATCH 2/7] clk: atlas7: export mux clks so that driver can use it Barry Song
2015-07-28 21:56 ` Stephen Boyd
2015-07-29 12:24 ` Barry Song
2015-07-28 6:27 ` [PATCH 3/7] clk: sirf: fix integer overflow in dto rate calculation Barry Song
2015-07-28 6:27 ` [PATCH 4/7] clk: atlas7: replace dto resolution magic number by macro Barry Song
2015-07-28 6:27 ` [PATCH 5/7] clk: atlas7: fix the clock tree for bluetooth stuff Barry Song
2015-07-28 22:07 ` Stephen Boyd
2015-07-29 14:52 ` Barry Song
2015-08-06 1:44 ` Stephen Boyd
2015-08-06 9:53 ` Barry Song
2015-08-10 2:35 ` Barry Song
2015-08-12 0:02 ` Stephen Boyd
2015-08-12 2:39 ` Barry Song
2015-07-28 6:27 ` [PATCH 6/7] clk: sirf: fix bit field and its root clk for coresight_tpiu Barry Song
2015-07-28 6:27 ` Barry Song [this message]
2015-08-04 14:45 [PATCH 0/7 v2] clk: atlas7: a bind of fixes Barry Song
2015-08-04 14:45 ` [PATCH 7/7] clk: atlas7: fix pll missed divide NR in fraction mode Barry Song
2015-08-12 0:30 ` Stephen Boyd
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