linux-kernel - [PATCH 4.2 038/120] clk: pistachio: Fix override of clk-pll settings from boot loader

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Date:	Sat, 19 Sep 2015 10:27:58 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Andrew Bresitcker <abrestic@...omium.org>,
	Zdenko Pulitika <zdenko.pulitika@...tec.com>,
	Govindraj Raja <govindraj.raja@...tec.com>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: [PATCH 4.2 038/120] clk: pistachio: Fix override of clk-pll settings from boot loader

4.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zdenko Pulitika <zdenko.pulitika@...tec.com>

commit e53f21c761d141bbcbce06e9ddab3b4e0a828f2c upstream.

PLL enable callbacks are overriding PLL mode (int/frac) and
Noise reduction (on/off) settings set by the boot loader which
results in the incorrect clock rate.

PLL mode and noise reduction are defined by the DSMPD and DACPD bits
of the PLL control register. PLL .enable() callbacks enable PLL
by deasserting all power-down bits of the PLL control register,
including DSMPD and DACPD bits, which is not necessary since
these bits don't actually enable/disable PLL.

This commit fixes the problem by removing DSMPD and DACPD bits
from the "PLL enable" mask.

Fixes: 43049b0c83f17("CLK: Pistachio: Add PLL driver")
Reviewed-by: Andrew Bresitcker <abrestic@...omium.org>
Signed-off-by: Zdenko Pulitika <zdenko.pulitika@...tec.com>
Signed-off-by: Govindraj Raja <govindraj.raja@...tec.com>
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/clk/pistachio/clk-pll.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/clk/pistachio/clk-pll.c
+++ b/drivers/clk/pistachio/clk-pll.c
@@ -134,8 +134,7 @@ static int pll_gf40lp_frac_enable(struct
 	u32 val;
 
 	val = pll_readl(pll, PLL_CTRL3);
-	val &= ~(PLL_FRAC_CTRL3_PD | PLL_FRAC_CTRL3_DACPD |
-		 PLL_FRAC_CTRL3_DSMPD | PLL_FRAC_CTRL3_FOUTPOSTDIVPD |
+	val &= ~(PLL_FRAC_CTRL3_PD | PLL_FRAC_CTRL3_FOUTPOSTDIVPD |
 		 PLL_FRAC_CTRL3_FOUT4PHASEPD | PLL_FRAC_CTRL3_FOUTVCOPD);
 	pll_writel(pll, val, PLL_CTRL3);
 
@@ -277,7 +276,7 @@ static int pll_gf40lp_laint_enable(struc
 	u32 val;
 
 	val = pll_readl(pll, PLL_CTRL1);
-	val &= ~(PLL_INT_CTRL1_PD | PLL_INT_CTRL1_DSMPD |
+	val &= ~(PLL_INT_CTRL1_PD |
 		 PLL_INT_CTRL1_FOUTPOSTDIVPD | PLL_INT_CTRL1_FOUTVCOPD);
 	pll_writel(pll, val, PLL_CTRL1);
 


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