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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
View file

@ -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,

4
drivers/usb/musb-new/musb_core.h
View file

@ -200,6 +200,8 @@ enum musb_g_ep0_state {
* @vbus_status: returns vbus status if possible
* @set_vbus: forces vbus status
* @adjust_channel_params: pre check for standard dma channel_program func
* @pre_root_reset_end: called before the root usb port reset flag gets cleared
* @post_root_reset_end: called after the root usb port reset flag gets cleared
*/
struct musb_platform_ops {
int (*init)(struct musb *musb);
@ -221,6 +223,8 @@ struct musb_platform_ops {
int (*adjust_channel_params)(struct dma_channel *channel,
u16 packet_sz, u8 *mode,
dma_addr_t *dma_addr, u32 *len);
void (*pre_root_reset_end)(struct musb *musb);
void (*post_root_reset_end)(struct musb *musb);
};
/*

19
drivers/usb/musb-new/musb_uboot.c
View file

@ -193,19 +193,16 @@ static int _musb_reset_root_port(struct musb_host_data *host,
power &= 0xf0;
musb_writeb(mbase, MUSB_POWER, MUSB_POWER_RESET | power);
mdelay(50);
#ifdef CONFIG_ARCH_SUNXI
/*
* sunxi phy has a bug and it will wrongly detect high speed squelch
* when clearing reset on low-speed devices, temporary disable
* squelch detection to work around this.
*/
sunxi_usb_phy_enable_squelch_detect(0, 0);
#endif
if (host->host->ops->pre_root_reset_end)
host->host->ops->pre_root_reset_end(host->host);
power = musb_readb(mbase, MUSB_POWER);
musb_writeb(mbase, MUSB_POWER, ~MUSB_POWER_RESET & power);
#ifdef CONFIG_ARCH_SUNXI
sunxi_usb_phy_enable_squelch_detect(0, 1);
#endif
if (host->host->ops->post_root_reset_end)
host->host->ops->post_root_reset_end(host->host);
host->host->isr(0, host->host);
host->host_speed = (musb_readb(mbase, MUSB_POWER) & MUSB_POWER_HSMODE) ?
USB_SPEED_HIGH :

16
drivers/usb/musb-new/sunxi.c
View file

@ -304,10 +304,26 @@ static int sunxi_musb_init(struct musb *musb)
return 0;
}
static void sunxi_musb_pre_root_reset_end(struct musb *musb)
{
struct sunxi_glue *glue = to_sunxi_glue(musb->controller);
sun4i_usb_phy_set_squelch_detect(glue->phy, false);
}
static void sunxi_musb_post_root_reset_end(struct musb *musb)
{
struct sunxi_glue *glue = to_sunxi_glue(musb->controller);
sun4i_usb_phy_set_squelch_detect(glue->phy, true);
}
static const struct musb_platform_ops sunxi_musb_ops = {
.init = sunxi_musb_init,
.enable = sunxi_musb_enable,
.disable = sunxi_musb_disable,
.pre_root_reset_end = sunxi_musb_pre_root_reset_end,
.post_root_reset_end = sunxi_musb_post_root_reset_end,
};
/* Allwinner OTG supports up to 5 endpoints */

8
include/phy-sun4i-usb.h
View file

@ -23,4 +23,12 @@ int sun4i_usb_phy_id_detect(struct phy *phy);
*/
int sun4i_usb_phy_vbus_detect(struct phy *phy);
/**
* sun4i_usb_phy_set_squelch_detect() - Enable/disable squelch detect
*
* @phy: reference to a sun4i usb phy
* @enabled: wether to enable or disable squelch detect
*/
void sun4i_usb_phy_set_squelch_detect(struct phy *phy, bool enabled);
#endif /*__GENERIC_PHY_SUN4I_USB_H */