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sunxi: dram: Use divisor P=1 for PLL5

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This configures the PLL5P clock frequency to something in the ballpark
of 1GHz and allows more choices for MBUS and G2D clock frequency
selection (using their own divisors). In particular, it enables the use
of 2/3 clock speed ratio between MBUS and DRAM.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Siarhei Siamashka 2014-08-03 05:32:48 +03:00 • committed by Hans de Goede
parent 1a9717cbb3
commit 013f2d7469
1 changed files with 11 additions and 17 deletions
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28
arch/arm/cpu/armv7/sunxi/dram.c
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@ -243,7 +243,7 @@ static void mctl_setup_dram_clock(u32 clk, u32 mbus_clk)
/* PLL5P and PLL6 are the potential clock sources for MBUS */
u32 pll6x_div, pll5p_div;
u32 pll6x_clk = clock_get_pll6() / 1000000;
u32 pll5p_clk = clk / 24 * 24;
u32 pll5p_clk = clk / 24 * 48;
u32 pll5p_rate, pll6x_rate;
#ifdef CONFIG_SUN7I
pll6x_clk *= 2; /* sun7i uses PLL6*2, sun5i uses just PLL6 */
@ -256,46 +256,40 @@ static void mctl_setup_dram_clock(u32 clk, u32 mbus_clk)
reg_val &= ~CCM_PLL5_CTRL_N_MASK; /* set N to 0 (x0) */
reg_val &= ~CCM_PLL5_CTRL_P_MASK; /* set P to 0 (x1) */
if (clk >= 540 && clk < 552) {
/* dram = 540MHz, pll5p = 540MHz */
pll5p_clk = 540;
/* dram = 540MHz, pll5p = 1080MHz */
pll5p_clk = 1080;
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(2));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(3));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(15));
reg_val |= CCM_PLL5_CTRL_P(1);
} else if (clk >= 512 && clk < 528) {
/* dram = 512MHz, pll5p = 384MHz */
pll5p_clk = 384;
/* dram = 512MHz, pll5p = 1536MHz */
pll5p_clk = 1536;
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(3));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(4));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(16));
reg_val |= CCM_PLL5_CTRL_P(2);
} else if (clk >= 496 && clk < 504) {
/* dram = 496MHz, pll5p = 372MHz */
pll5p_clk = 372;
/* dram = 496MHz, pll5p = 1488MHz */
pll5p_clk = 1488;
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(3));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(2));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(31));
reg_val |= CCM_PLL5_CTRL_P(2);
} else if (clk >= 468 && clk < 480) {
/* dram = 468MHz, pll5p = 468MHz */
pll5p_clk = 468;
/* dram = 468MHz, pll5p = 936MHz */
pll5p_clk = 936;
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(2));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(3));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(13));
reg_val |= CCM_PLL5_CTRL_P(1);
} else if (clk >= 396 && clk < 408) {
/* dram = 396MHz, pll5p = 396MHz */
pll5p_clk = 396;
/* dram = 396MHz, pll5p = 792MHz */
pll5p_clk = 792;
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(2));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(3));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(11));
reg_val |= CCM_PLL5_CTRL_P(1);
} else {
/* any other frequency that is a multiple of 24 */
reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(2));
reg_val |= CCM_PLL5_CTRL_K(CCM_PLL5_CTRL_K_X(2));
reg_val |= CCM_PLL5_CTRL_N(CCM_PLL5_CTRL_N_X(clk / 24));
reg_val |= CCM_PLL5_CTRL_P(CCM_PLL5_CTRL_P_X(2));
}
reg_val &= ~CCM_PLL5_CTRL_VCO_GAIN; /* PLL VCO Gain off */
reg_val |= CCM_PLL5_CTRL_EN; /* PLL On */