diff options
| author | Jon Medhurst <tixy@linaro.org> | 2017-04-20 11:48:19 +0100 |
|---|---|---|
| committer | Ryan Harkin <ryan.harkin@linaro.org> | 2017-07-13 21:00:19 +0100 |
| commit | 7a7765ba87aa6025416f131b923c5f635d2691cb (patch) | |
| tree | 9020008ad3bfb06bd9b066632dbd4e2ffc96ddff | |
| parent | b394776b7f698680019c65129f0111d60d949266 (diff) | |
HACK: juno: Limit CPU frequency when running AArch32 kernelslatest-armlt-juno
The silicon doesn't seem to be able to cope with max frequency on the big core.
Signed-off-by: Jon Medhurst <tixy@linaro.org>
| -rw-r--r-- | drivers/firmware/arm_scpi.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/firmware/arm_scpi.c b/drivers/firmware/arm_scpi.c index acf277d0a6eb..8d39da71d6b9 100644 --- a/drivers/firmware/arm_scpi.c +++ b/drivers/firmware/arm_scpi.c @@ -659,6 +659,8 @@ static int opp_cmp_func(const void *opp1, const void *opp2) return t1->freq - t2->freq; } +static bool juno_cpufreq_limit_hack = 0; + static struct scpi_dvfs_info *scpi_dvfs_get_info(u8 domain) { struct scpi_dvfs_info *info; @@ -697,6 +699,14 @@ static struct scpi_dvfs_info *scpi_dvfs_get_info(u8 domain) sort(info->opps, info->count, sizeof(*opp), opp_cmp_func, NULL); + /* + * Juno silicon doesn't seem to be able to run the big cluster + * (domain == 0) at max frequency in AArch32 mode (it produces + * random and weird crashes) so drop the highest OPP in that case... + */ + if (juno_cpufreq_limit_hack && domain == 0) + --info->count; + scpi_info->dvfs[domain] = info; return info; } @@ -910,6 +920,10 @@ static int scpi_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; + if (IS_ENABLED(CONFIG_ARM) && of_find_compatible_node(NULL,NULL,"arm,juno")) { + juno_cpufreq_limit_hack = true; + } + scpi_info = devm_kzalloc(dev, sizeof(*scpi_info), GFP_KERNEL); if (!scpi_info) return -ENOMEM; |