diff mbox series

[v9,2/8] opp: Allow dev_pm_opp_set_clkname() to replace released clock

Message ID 20210827013415.24027-3-digetx@gmail.com (mailing list archive)
State Not Applicable, archived
Headers show
Series NVIDIA Tegra power management patches for 5.16 | expand

Commit Message

Dmitry Osipenko Aug. 27, 2021, 1:34 a.m. UTC 
The opp_table->clk is set to error once clock is released by
dev_pm_opp_put_clkname(). This doesn't allow to set clock again,
until OPP table is re-created from scratch. Check opp_table->clk for
both NULL and ERR_PTR to allow clock replacement. This is needed now
by NVIDIA Tegra 3d driver for initializing performance state of multiple
power domains, where PD driver sets and unsets OPP table clock while OPP
table reference is held outside of PD.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/opp/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index fae5267f5218..e26da1d4d6be 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -2136,7 +2136,7 @@  struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name)
 	}
 
 	/* clk shouldn't be initialized at this point */
-	if (WARN_ON(opp_table->clk)) {
+	if (WARN_ON(!IS_ERR_OR_NULL(opp_table->clk))) {
 		ret = -EBUSY;
 		goto err;
 	}