linux-kernel - [PATCH 3.19 078/175] MIPS: Alchemy: Fix cpu clock calculation

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Date:	Tue,  3 Mar 2015 22:14:16 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Manuel Lauss <manuel.lauss@...il.com>,
	John Crispin <blogic@...nwrt.org>,
	Bruno Randolf <br1@...fach.org>,
	Linux-MIPS <linux-mips@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: [PATCH 3.19 078/175] MIPS: Alchemy: Fix cpu clock calculation

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

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

From: Manuel Lauss <manuel.lauss@...il.com>

commit 69e4e63ec816a7e22cc3aa14bc7ef4ac734d370c upstream.

The current code uses bits 0-6 of the sys_cpupll register to calculate
core clock speed.  However this is only valid on Au1300, on all earlier
models the hardware only uses bits 0-5 to generate core clock.

This fixes clock calculation on the MTX1 (Au1500), where bit 6 of cpupll
is set as well, which ultimately lead the code to calculate a bogus cpu
core clock and also uart base clock down the line.

Signed-off-by: Manuel Lauss <manuel.lauss@...il.com>
Reported-by: John Crispin <blogic@...nwrt.org>
Tested-by: Bruno Randolf <br1@...fach.org>
Cc: Linux-MIPS <linux-mips@...ux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/9279/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/alchemy/common/clock.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/arch/mips/alchemy/common/clock.c
+++ b/arch/mips/alchemy/common/clock.c
@@ -127,6 +127,8 @@ static unsigned long alchemy_clk_cpu_rec
 		t = 396000000;
 	else {
 		t = alchemy_rdsys(AU1000_SYS_CPUPLL) & 0x7f;
+		if (alchemy_get_cputype() < ALCHEMY_CPU_AU1300)
+			t &= 0x3f;
 		t *= parent_rate;
 	}
 


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