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From: "Teresa Gámez" <t.gamez@phytec.de>
To: barebox@lists.infradead.org
Subject: [PATCHv2 1/2] ARM pcm043: Use PDR0 to change cpu freq
Date: Mon, 22 Aug 2011 15:51:04 +0200	[thread overview]
Message-ID: <1314021065-10784-1-git-send-email-t.gamez@phytec.de> (raw)

Instead of changing the MPCTL to set an other cpu frequency,
use the post divider.

This prevents freezing when changing the clock from 399MHz to 532MHz.

Signed-off-by: Teresa Gámez <t.gamez@phytec.de>
---
 arch/arm/boards/pcm043/pcm043.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boards/pcm043/pcm043.c b/arch/arm/boards/pcm043/pcm043.c
index 966899a..5cd6432 100644
--- a/arch/arm/boards/pcm043/pcm043.c
+++ b/arch/arm/boards/pcm043/pcm043.c
@@ -301,8 +301,8 @@ static int pcm043_core_setup(void)
 
 core_initcall(pcm043_core_setup);
 
-#define MPCTL_PARAM_399     (IMX_PLL_PD(0) | IMX_PLL_MFD(15) | IMX_PLL_MFI(8) | IMX_PLL_MFN(5))
-#define MPCTL_PARAM_532     ((1 << 31) | IMX_PLL_PD(0) | IMX_PLL_MFD(11) | IMX_PLL_MFI(11) | IMX_PLL_MFN(1))
+#define CCM_PDR0_PARAM_399	((1 << 12) | (1 << 16))
+#define CCM_PDR0_PARAM_532	(1 << 12)
 
 static int do_cpufreq(struct command *cmdtp, int argc, char *argv[])
 {
@@ -315,10 +315,10 @@ static int do_cpufreq(struct command *cmdtp, int argc, char *argv[])
 
 	switch (freq) {
 	case 399:
-		writel(MPCTL_PARAM_399, IMX_CCM_BASE + CCM_MPCTL);
+		writel(CCM_PDR0_PARAM_399, IMX_CCM_BASE + CCM_PDR0);
 		break;
 	case 532:
-		writel(MPCTL_PARAM_532, IMX_CCM_BASE + CCM_MPCTL);
+		writel(CCM_PDR0_PARAM_532, IMX_CCM_BASE + CCM_PDR0);
 		break;
 	default:
 		return COMMAND_ERROR_USAGE;
-- 
1.7.0.4


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             reply	other threads:[~2011-08-22 13:51 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-22 13:51 Teresa Gámez [this message]
2011-08-22 13:51 ` [PATCHv2 2/2] ARM pcm043: change RAM timings Teresa Gámez
2011-08-22 17:27 ` [PATCHv2 1/2] ARM pcm043: Use PDR0 to change cpu freq Sascha Hauer
2011-08-23  9:31   ` Teresa Gamez
2011-08-23 10:43     ` Sascha Hauer

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