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cpufreq: sun50i: Fix CPU speed bin detection

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I have observed failures to boot on Orange Pi 3, because this driver
determined that my SoC is from the normal bin, but my SoC only works
reliably with the OPP values for the slowest bin.

By querying H6 owners, it was found that e-fuse values found in the wild
are in the range of 1-3, value of 7 was not reported, yet. From this and
from unused defines in BSP code, it can be assumed that meaning of efuse
values on H6 actually is:

- 1 = slowest bin
- 2 = normal bin
- 3 = fastest bin

Vendor code actually treats 0 and 2 as invalid efuse values, but later
treats all invalid values as a normal bin. This looks like a mistake in
bin detection code, that was plastered over by a hack in cpufreq code,
so let's not repeat it here. It probably only works because there are no
SoCs in the wild with efuse value of 0, and fast bin SoCs are made to
use normal bin OPP tables, which is also safe.

Let's play it safe and interpret 0 as the slowest bin, but fix detection
of other bins to match this research. More research will be done before
actual OPP tables are merged.

Fixes: f328584f7b ("cpufreq: Add sun50i nvmem based CPU scaling driver")
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Ondrej Jirman 2019-11-01 17:41:51 +01:00 committed by Viresh Kumar
parent e32beb0641
commit c23734487f
1 changed files with 10 additions and 15 deletions
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25
drivers/cpufreq/sun50i-cpufreq-nvmem.c
View File

@ -25,7 +25,7 @@
static struct platform_device *cpufreq_dt_pdev, *sun50i_cpufreq_pdev;
/**
* sun50i_cpufreq_get_efuse() - Parse and return efuse value present on SoC
* sun50i_cpufreq_get_efuse() - Determine speed grade from efuse value
* @versions: Set to the value parsed from efuse
*
* Returns 0 if success.
@ -69,21 +69,16 @@ static int sun50i_cpufreq_get_efuse(u32 *versions)
return PTR_ERR(speedbin);
efuse_value = (*speedbin >> NVMEM_SHIFT) & NVMEM_MASK;
switch (efuse_value) {
case 0b0001:
*versions = 1;
break;
case 0b0011:
*versions = 2;
break;
default:
/*
* For other situations, we treat it as bin0.
* This vf table can be run for any good cpu.
*/
/*
* We treat unexpected efuse values as if the SoC was from
* the slowest bin. Expected efuse values are 1-3, slowest
* to fastest.
*/
if (efuse_value >= 1 && efuse_value <= 3)
*versions = efuse_value - 1;
else
*versions = 0;
break;
}
kfree(speedbin);
return 0;