linux-kernel - [PATCH C 08/13] OMAP3 clock: put DPLL into bypass if bypass rate = clk->rate, not hardware rate

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Message-ID: <20090128190829.12092.86115.stgit@localhost.localdomain>
Date:	Wed, 28 Jan 2009 12:08:32 -0700
From:	Paul Walmsley <paul@...an.com>
To:	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org
Cc:	linux-omap@...r.kernel.org, Paul Walmsley <paul@...an.com>,
	Tony Lindgren <tony@...mide.com>,
	Tero Kristo <tero.kristo@...ia.com>
Subject: [PATCH C 08/13] OMAP3 clock: put DPLL into bypass if bypass rate =
	clk->rate, not hardware rate

When a non-CORE DPLL is enabled via omap3_noncore_dpll_enable(), use
the user's desired rate in clk->rate to determine whether to put the
DPLL into bypass or lock mode, rather than reading the DPLL's current
idle state from its hardware registers.

This fixes a bug observed when leaving retention. Non-CORE DPLLs were
not being relocked when downstream clocks re-enabled; rather, the DPLL
entered bypass mode.

Problem reported by Tero Kristo <tero.kristo@...ia.com>.

linux-omap source commit is 8b1f0bd44fe490ec631230c8c040753a2bda8caa.

Signed-off-by: Paul Walmsley <paul@...an.com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
Cc: Tero Kristo <tero.kristo@...ia.com>
---
 arch/arm/mach-omap2/clock34xx.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index 844fe82..424eed6 100644
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -280,9 +280,7 @@ static int omap3_noncore_dpll_enable(struct clk *clk)
 	if (!dd)
 		return -EINVAL;
 
-	rate = omap2_get_dpll_rate(clk);
-
-	if (dd->bypass_clk->rate == rate)
+	if (clk->rate == dd->bypass_clk->rate)
 		r = _omap3_noncore_dpll_bypass(clk);
 	else
 		r = _omap3_noncore_dpll_lock(clk);


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