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PM / devfreq: rockchip_dmc: Add lock for rockchip_dmcfreq_get_dev_status

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RK3588 platform may crash if the CPU and MCU access the DFI/DMC
registers at same time.

Signed-off-by: YouMin Chen <cym@rock-chips.com>
Change-Id: I6912f72aff09f7db6d696f4a5b15ccc06f68ba04
This commit is contained in:
YouMin Chen
2023-04-17 11:30:52 +08:00
committed by Tao Huang
parent 6dd877865e
commit c92deced0b
1 changed files with 10 additions and 2 deletions
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12
drivers/devfreq/rockchip_dmc.c
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@@ -594,12 +594,17 @@ static int rockchip_dmcfreq_get_dev_status(struct device *dev,
if (!dmcfreq->info.auto_freq_en)
return -EINVAL;
/*
* RK3588 platform may crash if the CPU and MCU access the DFI/DMC
* registers at same time.
*/
rockchip_monitor_volt_adjust_lock(dmcfreq->mdev_info);
for (i = 0; i < dmcfreq->edev_count; i++) {
ret = devfreq_event_get_event(dmcfreq->edev[i], &edata);
if (ret < 0) {
dev_err(dev, "failed to get event %s\n",
dmcfreq->edev[i]->desc->name);
return ret;
goto out;
}
if (i == dmcfreq->dfi_id) {
stat->busy_time = edata.load_count;
@@ -609,7 +614,10 @@ static int rockchip_dmcfreq_get_dev_status(struct device *dev,
}
}
return 0;
out:
rockchip_monitor_volt_adjust_unlock(dmcfreq->mdev_info);
return ret;
}
static int rockchip_dmcfreq_get_cur_freq(struct device *dev,