[PATCH v5 4/7] clk: tegra: Halve SCLK rate on Tegra20
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2021-03-17 19:32:16
Also in:
linux-clk, linux-tegra, lkml
Subsystem:
common clk framework, tegra clock driver, the rest · Maintainers:
Michael Turquette, Stephen Boyd, Peter De Schrijver, Prashant Gaikwad, Linus Torvalds
Higher SCLK rates on Tegra20 require high core voltage. The higher clock rate may have a positive performance effect only for AHB DMA transfers and AVP CPU, but both aren't used by upstream kernel at all. Halve SCLK rate on Tegra20 in order to remove the high core voltage requirement. Acked-by: Thierry Reding <redacted> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/clk/tegra/clk-tegra20.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/clk/tegra/clk-tegra20.c b/drivers/clk/tegra/clk-tegra20.c
index 3efc651b42e3..3664593a5ba4 100644
--- a/drivers/clk/tegra/clk-tegra20.c
+++ b/drivers/clk/tegra/clk-tegra20.c@@ -1021,9 +1021,9 @@ static struct tegra_clk_init_table init_table[] __initdata = { { TEGRA20_CLK_PLL_P_OUT3, TEGRA20_CLK_CLK_MAX, 72000000, 1 }, { TEGRA20_CLK_PLL_P_OUT4, TEGRA20_CLK_CLK_MAX, 24000000, 1 }, { TEGRA20_CLK_PLL_C, TEGRA20_CLK_CLK_MAX, 600000000, 0 }, - { TEGRA20_CLK_PLL_C_OUT1, TEGRA20_CLK_CLK_MAX, 240000000, 0 }, - { TEGRA20_CLK_SCLK, TEGRA20_CLK_PLL_C_OUT1, 240000000, 0 }, - { TEGRA20_CLK_HCLK, TEGRA20_CLK_CLK_MAX, 240000000, 0 }, + { TEGRA20_CLK_PLL_C_OUT1, TEGRA20_CLK_CLK_MAX, 120000000, 0 }, + { TEGRA20_CLK_SCLK, TEGRA20_CLK_PLL_C_OUT1, 120000000, 0 }, + { TEGRA20_CLK_HCLK, TEGRA20_CLK_CLK_MAX, 120000000, 0 }, { TEGRA20_CLK_PCLK, TEGRA20_CLK_CLK_MAX, 60000000, 0 }, { TEGRA20_CLK_CSITE, TEGRA20_CLK_CLK_MAX, 0, 1 }, { TEGRA20_CLK_CCLK, TEGRA20_CLK_CLK_MAX, 0, 1 },
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2.30.2