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Subject[PATCH] venus: pm_helpers: Control core power domain manually
Date
Presently we use device_link to control core power domain. But this
leads to issues because the genpd doesn't guarantee synchronous on/off
for supplier devices. Switch to manually control by pmruntime calls.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
---
drivers/media/platform/qcom/venus/core.h | 1 -
.../media/platform/qcom/venus/pm_helpers.c | 36 ++++++++++---------
2 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
index dfc13b2f371f..74d9fd3d51cc 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -128,7 +128,6 @@ struct venus_core {
struct icc_path *cpucfg_path;
struct opp_table *opp_table;
bool has_opp_table;
- struct device_link *pd_dl_venus;
struct device *pmdomains[VIDC_PMDOMAINS_NUM_MAX];
struct device_link *opp_dl_venus;
struct device *opp_pmdomain;
diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
index 94219a3093cb..e0338932a720 100644
--- a/drivers/media/platform/qcom/venus/pm_helpers.c
+++ b/drivers/media/platform/qcom/venus/pm_helpers.c
@@ -774,13 +774,6 @@ static int vcodec_domains_get(struct device *dev)
core->pmdomains[i] = pd;
}

- core->pd_dl_venus = device_link_add(dev, core->pmdomains[0],
- DL_FLAG_PM_RUNTIME |
- DL_FLAG_STATELESS |
- DL_FLAG_RPM_ACTIVE);
- if (!core->pd_dl_venus)
- return -ENODEV;
-
skip_pmdomains:
if (!core->has_opp_table)
return 0;
@@ -807,14 +800,12 @@ static int vcodec_domains_get(struct device *dev)
opp_dl_add_err:
dev_pm_opp_detach_genpd(core->opp_table);
opp_attach_err:
- if (core->pd_dl_venus) {
- device_link_del(core->pd_dl_venus);
- for (i = 0; i < res->vcodec_pmdomains_num; i++) {
- if (IS_ERR_OR_NULL(core->pmdomains[i]))
- continue;
- dev_pm_domain_detach(core->pmdomains[i], true);
- }
+ for (i = 0; i < res->vcodec_pmdomains_num; i++) {
+ if (IS_ERR_OR_NULL(core->pmdomains[i]))
+ continue;
+ dev_pm_domain_detach(core->pmdomains[i], true);
}
+
return ret;
}

@@ -827,9 +818,6 @@ static void vcodec_domains_put(struct device *dev)
if (!res->vcodec_pmdomains_num)
goto skip_pmdomains;

- if (core->pd_dl_venus)
- device_link_del(core->pd_dl_venus);
-
for (i = 0; i < res->vcodec_pmdomains_num; i++) {
if (IS_ERR_OR_NULL(core->pmdomains[i]))
continue;
@@ -917,16 +905,30 @@ static void core_put_v4(struct device *dev)
static int core_power_v4(struct device *dev, int on)
{
struct venus_core *core = dev_get_drvdata(dev);
+ struct device *pmctrl = core->pmdomains[0];
int ret = 0;

if (on == POWER_ON) {
+ if (pmctrl) {
+ ret = pm_runtime_get_sync(pmctrl);
+ if (ret < 0) {
+ pm_runtime_put_noidle(pmctrl);
+ return ret;
+ }
+ }
+
ret = core_clks_enable(core);
+ if (ret < 0 && pmctrl)
+ pm_runtime_put_sync(pmctrl);
} else {
/* Drop the performance state vote */
if (core->opp_pmdomain)
dev_pm_opp_set_rate(dev, 0);

core_clks_disable(core);
+
+ if (pmctrl)
+ pm_runtime_put_sync(pmctrl);
}

return ret;
--
2.17.1
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