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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.

Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Hans de Goede
2015-03-29 12:50:46 +02:00
committed by Felipe Balbi
parent 7a64c7283e
commit 24fe86a617
2 changed files with 35 additions and 0 deletions
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9
drivers/phy/phy-sun4i-usb.c
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@@ -30,6 +30,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/phy/phy-sun4i-usb.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
@@ -58,6 +59,7 @@
#define PHY_OTG_FUNC_EN 0x28
#define PHY_VBUS_DET_EN 0x29
#define PHY_DISCON_TH_SEL 0x2a
#define PHY_SQUELCH_DETECT 0x3c
#define MAX_PHYS 3
@@ -204,6 +206,13 @@ static int sun4i_usb_phy_power_off(struct phy *_phy)
return 0;
}
void sun4i_usb_phy_set_squelch_detect(struct phy *_phy, bool enabled)
{
struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
sun4i_usb_phy_write(phy, PHY_SQUELCH_DETECT, enabled ? 0 : 2, 2);
}
static struct phy_ops sun4i_usb_phy_ops = {
.init = sun4i_usb_phy_init,
.exit = sun4i_usb_phy_exit,