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-rw-r--r--drivers/pmdomain/imx/gpcv2.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/pmdomain/imx/gpcv2.c b/drivers/pmdomain/imx/gpcv2.c
index 4b828d74a6..856eaac0ec 100644
--- a/drivers/pmdomain/imx/gpcv2.c
+++ b/drivers/pmdomain/imx/gpcv2.c
@@ -393,6 +393,17 @@ static int imx_pgc_power_up(struct generic_pm_domain *genpd)
* automatically there. Just add a delay and suppose the handshake finish
* after that.
*/
+
+ /*
+ * For some BLK-CTL module (eg. AudioMix on i.MX8MP) doesn't have BUS
+ * clk-en bit, it is better to add delay here, as the BLK-CTL module
+ * doesn't need to care about how it is powered up.
+ *
+ * regmap_read_bypassed() is to make sure the above write IO transaction
+ * already reaches target before udelay()
+ */
+ regmap_read_bypassed(domain->regmap, domain->regs->hsk, &reg_val);
+ udelay(5);
}
/* Disable reset clocks for all devices in the domain */