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phy: sun4i-usb: Add a sunxi specific function for setting squelch-detect

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The sunxi otg phy has a bug where it wrongly detects a high speed squelch
when reset on the root port gets de-asserted with a lo-speed device.

The workaround for this is to disable squelch detect before de-asserting
reset, and re-enabling it after the reset de-assert is done. Add a sunxi
specific phy function to allow the sunxi-musb glue to do this.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Jun Nie <jun.nie@linaro.org>
This commit is contained in:
Jagan Teki
2018-05-07 13:03:37 +05:30
parent 237050fc62
commit aa29b11b3f
5 changed files with 42 additions and 11 deletions
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6
drivers/phy/allwinner/phy-sun4i-usb.c
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@@ -36,6 +36,7 @@
#define PHY_TX_AMPLITUDE_TUNE 0x20
#define PHY_TX_SLEWRATE_TUNE 0x22
#define PHY_DISCON_TH_SEL 0x2a
#define PHY_SQUELCH_DETECT 0x3c
#define PHYCTL_DATA BIT(7)
#define OTGCTL_ROUTE_MUSB BIT(0)
@@ -383,6 +384,11 @@ int sun4i_usb_phy_id_detect(struct phy *phy)
return gpio_get_value(usb_phy->gpio_id_det);
}
void sun4i_usb_phy_set_squelch_detect(struct phy *phy, bool enabled)
{
sun4i_usb_phy_write(phy, PHY_SQUELCH_DETECT, enabled ? 0 : 2, 2);
}
static struct phy_ops sun4i_usb_phy_ops = {
.of_xlate = sun4i_usb_phy_xlate,
.init = sun4i_usb_phy_init,