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sunxi: Add CONFIG_OLD_SUNXI_KERNEL_COMPAT Kconfig option
Add a Kconfig option which users can select when they want to boot older kernels, e.g. the linux-sunxi 3.4 kernels. For now this just forces the pll5 "p" value to 1 (divide by 2) as that is what those kernels are hardcoded too, in the future this may enable further workarounds. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Tom Rini <trini@ti.com> -- Changes in v2: -s/CONFIG_OLD_KERNEL_COMPAT/CONFIG_OLD_SUNXI_KERNEL_COMPAT. -Move the code block setting P(1) for old kernels to where P gets cleared
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2 changed files with 11 additions and 0 deletions
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@ -262,6 +262,10 @@ static void mctl_setup_dram_clock(u32 clk, u32 mbus_clk)
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reg_val &= ~CCM_PLL5_CTRL_K_MASK; /* set K to 0 (x1) */
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reg_val &= ~CCM_PLL5_CTRL_K_MASK; /* set K to 0 (x1) */
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reg_val &= ~CCM_PLL5_CTRL_N_MASK; /* set N to 0 (x0) */
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reg_val &= ~CCM_PLL5_CTRL_N_MASK; /* set N to 0 (x0) */
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reg_val &= ~CCM_PLL5_CTRL_P_MASK; /* set P to 0 (x1) */
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reg_val &= ~CCM_PLL5_CTRL_P_MASK; /* set P to 0 (x1) */
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#ifdef CONFIG_OLD_SUNXI_KERNEL_COMPAT
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/* Old kernels are hardcoded to P=1 (divide by 2) */
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reg_val |= CCM_PLL5_CTRL_P(1);
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#endif
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if (clk >= 540 && clk < 552) {
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if (clk >= 540 && clk < 552) {
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/* dram = 540MHz */
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/* dram = 540MHz */
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reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(2));
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reg_val |= CCM_PLL5_CTRL_M(CCM_PLL5_CTRL_M_X(2));
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@ -20,6 +20,13 @@ config SYS_SOC
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config FDTFILE
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config FDTFILE
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string "Default fdtfile env setting for this board"
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string "Default fdtfile env setting for this board"
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config OLD_SUNXI_KERNEL_COMPAT
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boolean "Enable workarounds for booting old kernels"
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default n
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---help---
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Set this to enable various workarounds for old kernels, this results in
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sub-optimal settings for newer kernels, only enable if needed.
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config MMC0_CD_PIN
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config MMC0_CD_PIN
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string "Card detect pin for mmc0"
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string "Card detect pin for mmc0"
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default ""
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default ""
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