Re: [PATCH v2 10/10] usb: chipidea: tegra: Add USB_TEGRA_PHY module to driver's dependencies

20.12.2019 06:56, Peter Chen пишет:

On 19-12-20 04:52:38, Dmitry Osipenko wrote:

quoted

Now, when ci_hdrc_tegra kernel module is loaded, the phy_tegra_usb module
is loaded too regardless of kernel's configuration. Previously this
problem was masked because Tegra's EHCI driver is usually enabled in
kernel's config and thus PHY driver was getting loaded because of it, but
now I was making some more thorough testing and noticed that PHY's module
isn't getting auto-loaded without the host driver.

Note that ChipIdea's driver doesn't use any of the exported functions of
phy_tegra_usb module and thus the module needs to be requested explicitly.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/usb/chipidea/Kconfig         | 1 +
 drivers/usb/chipidea/ci_hdrc_tegra.c | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
index ae850b3fddf2..d53db520e209 100644
--- a/drivers/usb/chipidea/Kconfig
+++ b/drivers/usb/chipidea/Kconfig

@@ -7,6 +7,7 @@ config USB_CHIPIDEA
 	select RESET_CONTROLLER
 	select USB_ULPI_BUS
 	select USB_ROLE_SWITCH
+	select USB_TEGRA_PHY if ARCH_TEGRA
 	help
 	  Say Y here if your system has a dual role high speed USB
 	  controller based on ChipIdea silicon IP. It supports:

diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
index 7455df0ede49..8bc11100245d 100644
--- a/drivers/usb/chipidea/ci_hdrc_tegra.c
+++ b/drivers/usb/chipidea/ci_hdrc_tegra.c

@@ -53,6 +53,12 @@ static int tegra_udc_probe(struct platform_device *pdev)
 	struct tegra_udc *udc;
 	int err;
 
+	if (IS_MODULE(CONFIG_USB_TEGRA_PHY)) {
+		err = request_module("phy_tegra_usb");
+		if (err)
+			return err;
+	}
+

Why you do this dependency, if this controller driver can't
get USB PHY, it should return error. What's the return value
after calling below:

	udc->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);

It returns -EPROBE_DEFER when phy_tegra_usb isn't loaded.

So if you'll do:

# rmmod ci_hdrc_tegra; rmmod ci_hdrc; rmmod phy_tegra_usb;
# modprobe ci_hdrc_tegra
# lsmod
Module                  Size  Used by
ci_hdrc_tegra          16384  0
ci_hdrc                45056  1 ci_hdrc_tegra

After this patch:

# rmmod ci_hdrc_tegra; rmmod ci_hdrc; rmmod phy_tegra_usb;
# modprobe ci_hdrc_tegra
# lsmod
Module                  Size  Used by
Module                  Size  Used by
phy_tegra_usb          20480  1
ci_hdrc_tegra          16384  0
ci_hdrc                45056  1 ci_hdrc_tegra