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phy: fsl-imx8mq-usb: keep PHY power domain runtime always-on for i.MX8MP

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On i.MX8MP, the USB PHY has a dedicated power domain that was previously
never powered off at runtime. With the introduction of runtime PM support,
the power domain will be powered off if the device is runtime suspended,
which breaks USB wakeup functionality.

To preserve wakeup functionality, mark the PHY power domain as runtime
always-on for i.MX8MP platform. To limit the behavior to i.MX8MP, add a
need_genpd_rpm_on to imx8mq_usb_phy_drvdata and set it as true for i.MX8MP.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260731-imx8mp-usb-phy-improvement-v8-6-2ec8d6b3854d@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Xu Yang 2026-07-31 16:11:24 +08:00 committed by Vinod Koul
parent 2d9dcffd5d
commit ee9e2b39ea
1 changed files with 9 additions and 0 deletions
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9
drivers/phy/freescale/phy-fsl-imx8mq-usb.c
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@ -9,6 +9,7 @@
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/regmap.h>
@ -134,6 +135,7 @@ struct imx8mq_usb_phy {
struct imx8mq_usb_phy_drvdata {
const struct phy_ops *ops;
bool need_genpd_rpm_on;
};
static void tca_blk_orientation_set(struct tca_blk *tca,
@ -669,6 +671,7 @@ static const struct imx8mq_usb_phy_drvdata imx8mq_usb_phy_data = {
static const struct imx8mq_usb_phy_drvdata imx8mp_usb_phy_data = {
.ops = &imx8mp_usb_phy_ops,
.need_genpd_rpm_on = true,
};
static const struct imx8mq_usb_phy_drvdata imx95_usb_phy_data = {
@ -738,6 +741,12 @@ static int imx8mq_usb_phy_probe(struct platform_device *pdev)
if (!phy_data)
return -EINVAL;
if (phy_data->need_genpd_rpm_on) {
ret = dev_pm_genpd_rpm_always_on(dev, true);
if (ret && ret != -EOPNOTSUPP)
dev_warn(dev, "failed to set genpd rpm always on\n");
}
pm_runtime_set_active(dev);
pm_runtime_enable(dev);