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Code Issues Releases Wiki Activity

usb: phy: tegra: Clean up ulpi_phy_power_off

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Firstly, the PHY's clock needs to unprepared to keep prepare count
balanced. Secondly, downstream code suggests that reset is synchronous
and thus it should be asserted before disabling clock.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20200106013416.9604-4-digetx@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Osipenko 2020-01-06 04:33:59 +03:00 committed by Greg Kroah-Hartman
parent 62a7f62891
commit 28d190ac43
1 changed files with 13 additions and 2 deletions
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15
drivers/usb/phy/phy-tegra-usb.c
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@ -757,8 +757,19 @@ static int ulpi_phy_power_on(struct tegra_usb_phy *phy)
static int ulpi_phy_power_off(struct tegra_usb_phy *phy)
{
clk_disable(phy->clk);
return gpio_direction_output(phy->reset_gpio, 0);
int err;
err = gpio_direction_output(phy->reset_gpio, 0);
if (err) {
dev_err(phy->u_phy.dev, "reset GPIO not asserted: %d\n", err);
return err;
}
usleep_range(5000, 6000);
clk_disable_unprepare(phy->clk);
return 0;
}
static void tegra_usb_phy_close(struct tegra_usb_phy *phy)