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Add linux patch to use frequency config in pre-bootloader
Signed-off-by: Lada Trimasova <ltrimas@synopsys.com>
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Lada Trimasova
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Apr 28, 2016
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| From a2afd96610c0b0ae5b50cb2761fbba87a7a3765c Mon Sep 17 00:00:00 2001 | ||
| From: Lada Trimasova <ltrimas@synopsys.com> | ||
| Date: Thu, 28 Apr 2016 18:09:55 +0300 | ||
| Subject: [PATCH] Use frequency config in pre-bootloader | ||
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| In this release we get rid of hack when frequency depends on cores number. | ||
| Now use frequency config in pre-bootloader. | ||
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| Signed-off-by: Lada Trimasova <ltrimas@synopsys.com> | ||
| --- | ||
| arch/arc/plat-axs10x/axs10x.c | 44 ++----------------------------------------- | ||
| 1 file changed, 2 insertions(+), 42 deletions(-) | ||
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| diff --git a/arch/arc/plat-axs10x/axs10x.c b/arch/arc/plat-axs10x/axs10x.c | ||
| index 1b0f0f4..3fb3de1 100644 | ||
| --- a/arch/arc/plat-axs10x/axs10x.c | ||
| +++ b/arch/arc/plat-axs10x/axs10x.c | ||
| @@ -390,50 +390,10 @@ axs103_set_freq(unsigned int id, unsigned int fd, unsigned int od) | ||
| static void __init axs103_early_init(void) | ||
| { | ||
| /* | ||
| - * AXS103 configurations for SMP/QUAD configurations share device tree | ||
| - * which defaults to 90 MHz. However recent failures of Quad config | ||
| - * revealed P&R timing violations so clamp it down to safe 50 MHz | ||
| - * Instead of duplicating defconfig/DT for SMP/QUAD, add a small hack | ||
| - * | ||
| - * This hack is really hacky as of now. Fix it properly by getting the | ||
| - * number of cores as return value of platform's early SMP callback | ||
| + * In this release we use frequency config in pre-bootloader. | ||
| */ | ||
| -#ifdef CONFIG_ARC_MCIP | ||
| - unsigned int num_cores = (read_aux_reg(ARC_REG_MCIP_BCR) >> 16) & 0x3F; | ||
| - if (num_cores > 2) | ||
| - arc_set_core_freq(50 * 1000000); | ||
| - else if (num_cores == 2) | ||
| - arc_set_core_freq(75 * 1000000); | ||
| -#endif | ||
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||
| - switch (arc_get_core_freq()/1000000) { | ||
| - case 33: | ||
| - axs103_set_freq(1, 1, 1); | ||
| - break; | ||
| - case 50: | ||
| - axs103_set_freq(1, 30, 20); | ||
| - break; | ||
| - case 75: | ||
| - axs103_set_freq(2, 45, 10); | ||
| - break; | ||
| - case 90: | ||
| - axs103_set_freq(2, 54, 10); | ||
| - break; | ||
| - case 100: | ||
| - axs103_set_freq(1, 30, 10); | ||
| - break; | ||
| - case 125: | ||
| - axs103_set_freq(2, 45, 6); | ||
| - break; | ||
| - default: | ||
| - /* | ||
| - * In this case, core_frequency derived from | ||
| - * DT "clock-frequency" might not match with board value. | ||
| - * Hence update it to match the board value. | ||
| - */ | ||
| - arc_set_core_freq(axs103_get_freq() * 1000000); | ||
| - break; | ||
| - } | ||
| + arc_set_core_freq(axs103_get_freq() * 1000000); | ||
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| pr_info("Freq is %dMHz\n", axs103_get_freq()); | ||
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| -- | ||
| 2.5.0 | ||
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