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authorDavid Hendricks <dhendrix@chromium.org>2013-08-22 16:52:38 -0700
committerIsaac Christensen <isaac.christensen@se-eng.com>2014-08-07 23:54:54 +0200
commit0ffa11bdbba48defc55cd38fb2aa2492ca2b5492 (patch)
tree1623c55ad49d4f34cd5d3edaa409a535e69120c7 /src/cpu/samsung
parentee4bfbf3e142b17bf263f5ddb3840ed683a04635 (diff)
exynos5420: Set the CLK_DIV_CPERI1 value as per manual
Set the CLK_DIV_CPERI1 value as recommended by the 0.02 UM section 7.9.1.25. This suggests to use 0x3F3F0000 as the value to be set to save power. This is ported from https://gerrit.chromium.org/gerrit/#/c/64905 Signed-off-by: David Hendricks <dhendrix@chromium.org> Change-Id: I89a6a72d20374a513019a272628a05e139b31773 Reviewed-on: https://gerrit.chromium.org/gerrit/66787 Commit-Queue: David Hendricks <dhendrix@chromium.org> Tested-by: David Hendricks <dhendrix@chromium.org> Reviewed-by: Ronald G. Minnich <rminnich@chromium.org> (cherry picked from commit 34be13b008e262c641268b7c1c6a08e49f18fc37) Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com> Reviewed-on: http://review.coreboot.org/6512 Tested-by: build bot (Jenkins) Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/cpu/samsung')
-rw-r--r--src/cpu/samsung/exynos5420/clock_init.c2
-rw-r--r--src/cpu/samsung/exynos5420/setup.h2
2 files changed, 4 insertions, 0 deletions
diff --git a/src/cpu/samsung/exynos5420/clock_init.c b/src/cpu/samsung/exynos5420/clock_init.c
index eeeda90bf2..15cd0c0368 100644
--- a/src/cpu/samsung/exynos5420/clock_init.c
+++ b/src/cpu/samsung/exynos5420/clock_init.c
@@ -209,6 +209,8 @@ void system_clock_init(void)
writel(CLK_DIV_PERIC3_VAL, &clk->clk_div_peric3);
writel(CLK_DIV_PERIC4_VAL, &clk->clk_div_peric4);
+ writel(CLK_DIV_CPERI1_VAL, &clk->clk_div_cperi1);
+
writel(CLK_DIV2_RATIO, &clk->clkdiv2_ratio);
writel(CLK_DIV4_RATIO, &clk->clkdiv4_ratio);
writel(CLK_DIV_G2D, &clk->clk_div_g2d);
diff --git a/src/cpu/samsung/exynos5420/setup.h b/src/cpu/samsung/exynos5420/setup.h
index 8f14a91602..ca7281dd82 100644
--- a/src/cpu/samsung/exynos5420/setup.h
+++ b/src/cpu/samsung/exynos5420/setup.h
@@ -48,6 +48,8 @@ struct exynos5_phy_control;
#define APLL_FOUT (1 << 0)
#define KPLL_FOUT (1 << 0)
+#define CLK_DIV_CPERI1_VAL 0x3f3f0000
+
/* APLL_CON1 */
#define APLL_CON1_VAL (0x0020f300)