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authorBrian Norris <briannorris@chromium.org>2022-04-06 04:48:42 +0300
committerChanwoo Choi <cw00.choi@samsung.com>2022-05-08 21:38:07 +0300
commit2e691421a2c9e0462175fe98171afa632861b199 (patch)
treeb3a244ec01e25c91a720d4a33a70476fdac2ef8b /drivers/devfreq
parentdefec178df76e0caadd4e8ef68f3d655a2088198 (diff)
downloadlinux-2e691421a2c9e0462175fe98171afa632861b199.tar.xz
PM / devfreq: rk3399_dmc: Block PMU during transitions
See the previous patch ("soc: rockchip: power-domain: Manage resource conflicts with firmware") for a thorough explanation of the conflicts. While ARM Trusted Firmware may be modifying memory controller and power-domain states, we need to block the kernel's power-domain driver. If the power-domain driver is disabled, there is no resource conflict and this becomes a no-op. Signed-off-by: Brian Norris <briannorris@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Diffstat (limited to 'drivers/devfreq')
-rw-r--r--drivers/devfreq/rk3399_dmc.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index e494d1497d60..daff40702615 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -21,6 +21,7 @@
#include <linux/rwsem.h>
#include <linux/suspend.h>
+#include <soc/rockchip/pm_domains.h>
#include <soc/rockchip/rk3399_grf.h>
#include <soc/rockchip/rockchip_sip.h>
@@ -94,6 +95,16 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
mutex_lock(&dmcfreq->lock);
/*
+ * Ensure power-domain transitions don't interfere with ARM Trusted
+ * Firmware power-domain idling.
+ */
+ err = rockchip_pmu_block();
+ if (err) {
+ dev_err(dev, "Failed to block PMU: %d\n", err);
+ goto out_unlock;
+ }
+
+ /*
* Some idle parameters may be based on the DDR controller clock, which
* is half of the DDR frequency.
* pd_idle and standby_idle are based on the controller clock cycle.
@@ -198,6 +209,8 @@ static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
dmcfreq->volt = target_volt;
out:
+ rockchip_pmu_unblock();
+out_unlock:
mutex_unlock(&dmcfreq->lock);
return err;
}