| Message ID | 20210112122724.1712-5-digetx@gmail.com |
|---|---|
| State | Rejected |
| Headers | show |
| Series | Couple improvements for Tegra clk driver | expand |
On Tue, Jan 12, 2021 at 03:27:23PM +0300, Dmitry Osipenko wrote: > 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. > > Signed-off-by: Dmitry Osipenko <digetx@gmail.com> > --- > drivers/clk/tegra/clk-tegra20.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) Acked-by: Thierry Reding <treding@nvidia.com>
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 },
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. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/clk/tegra/clk-tegra20.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)