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| author | Rajendra Nayak <rnayak@codeaurora.org> | 2019-03-20 15:19:09 +0530 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2019-06-17 09:51:31 +0530 |
| commit | cd7ea582866f43324f3d60f0d4daac05e08f0f41 (patch) | |
| tree | 94e61b00cd519eb374ddc84c62daef7fbdef6738 /drivers/opp | |
| parent | b3e3759ee4abd72bedbf4b109ff1749d3aea6f21 (diff) | |
| download | linux-riscv-cd7ea582866f43324f3d60f0d4daac05e08f0f41.tar.gz linux-riscv-cd7ea582866f43324f3d60f0d4daac05e08f0f41.tar.bz2 linux-riscv-cd7ea582866f43324f3d60f0d4daac05e08f0f41.zip | |
opp: Make dev_pm_opp_set_rate() handle freq = 0 to drop performance votes
For devices with performance state, we use dev_pm_opp_set_rate() to set
the appropriate clk rate and the performance state.
We do need a way to remove the performance state vote when we idle the
device and turn the clocks off. Use dev_pm_opp_set_rate() with freq = 0
to achieve this.
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
[ Viresh: Updated _set_required_opps() to handle the !opp case ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/opp')
| -rw-r--r-- | drivers/opp/core.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c index bae94bfa1e96..9fda9a0ec016 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -711,7 +711,7 @@ static int _set_required_opps(struct device *dev, /* Single genpd case */ if (!genpd_virt_devs) { - pstate = opp->required_opps[0]->pstate; + pstate = likely(opp) ? opp->required_opps[0]->pstate : 0; ret = dev_pm_genpd_set_performance_state(dev, pstate); if (ret) { dev_err(dev, "Failed to set performance state of %s: %d (%d)\n", @@ -729,7 +729,7 @@ static int _set_required_opps(struct device *dev, mutex_lock(&opp_table->genpd_virt_dev_lock); for (i = 0; i < opp_table->required_opp_count; i++) { - pstate = opp->required_opps[i]->pstate; + pstate = likely(opp) ? opp->required_opps[i]->pstate : 0; if (!genpd_virt_devs[i]) continue; @@ -765,18 +765,23 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) struct clk *clk; int ret; - if (unlikely(!target_freq)) { - dev_err(dev, "%s: Invalid target frequency %lu\n", __func__, - target_freq); - return -EINVAL; - } - opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) { dev_err(dev, "%s: device opp doesn't exist\n", __func__); return PTR_ERR(opp_table); } + if (unlikely(!target_freq)) { + if (opp_table->required_opp_tables) { + ret = _set_required_opps(dev, opp_table, NULL); + } else { + dev_err(dev, "target frequency can't be 0\n"); + ret = -EINVAL; + } + + goto put_opp_table; + } + clk = opp_table->clk; if (IS_ERR(clk)) { dev_err(dev, "%s: No clock available for the device\n", |