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usb: phy: qusb: Determine linestate for QUSB2 PHY

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Controller driver passes current speed to QUSB2 PHY driver in
the flags parameter. Determine linestate using speed,
mode and cable connection status. This deprecates the older
mechanism where linestate was determined by reading the now
obsoleted QUSB2PHY_PORT_UTMI_STATUS register.

Change-Id: I682eb250964f32f93d7b31dae0291aca7fa44362
Signed-off-by: Devdutt Patnaik <dpatnaik@codeaurora.org>
This commit is contained in:
Devdutt Patnaik 2016-06-28 16:31:45 -07:00 • committed by Hemant Kumar
parent 4d0a155ed7
commit e00fec135a
1 changed files with 23 additions and 4 deletions
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27
drivers/usb/phy/phy-msm-qusb-v2.c
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@ -66,6 +66,9 @@
#define QUSB2PHY_3P3_VOL_MAX 3200000 /* uV */
#define QUSB2PHY_3P3_HPM_LOAD 30000 /* uA */
#define LINESTATE_DP BIT(0)
#define LINESTATE_DM BIT(1)
unsigned int phy_tune2;
module_param(phy_tune2, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(phy_tune2, "QUSB PHY v2 TUNE2");
@ -520,6 +523,20 @@ static void qusb_phy_shutdown(struct usb_phy *phy)
qusb_phy_enable_clocks(qphy, false);
}
static u32 qusb_phy_get_linestate(struct qusb_phy *qphy)
{
u32 linestate = 0;
if (qphy->cable_connected) {
if (qphy->phy.flags & PHY_HSFS_MODE)
linestate |= LINESTATE_DP;
else if (qphy->phy.flags & PHY_LS_MODE)
linestate |= LINESTATE_DM;
}
return linestate;
}
/**
* Performs QUSB2 PHY suspend/resume functionality.
*
@ -546,8 +563,7 @@ static int qusb_phy_set_suspend(struct usb_phy *phy, int suspend)
writel_relaxed(0x00,
qphy->base + QUSB2PHY_INTR_CTRL);
linestate = readl_relaxed(qphy->base +
QUSB2PHY_INTR_STAT);
linestate = qusb_phy_get_linestate(qphy);
/*
* D+/D- interrupts are level-triggered, but we are
* only interested if the line state changes, so enable
@ -558,14 +574,17 @@ static int qusb_phy_set_suspend(struct usb_phy *phy, int suspend)
* configure the mask to trigger on D+ low OR D- high
*/
intr_mask = DMSE_INTERRUPT | DPSE_INTERRUPT;
if (!(linestate & DPSE_INTR_EN)) /* D+ low */
if (!(linestate & LINESTATE_DP)) /* D+ low */
intr_mask |= DPSE_INTR_HIGH_SEL;
if (!(linestate & DMSE_INTR_EN)) /* D- low */
if (!(linestate & LINESTATE_DM)) /* D- low */
intr_mask |= DMSE_INTR_HIGH_SEL;
writel_relaxed(intr_mask,
qphy->base + QUSB2PHY_INTR_CTRL);
dev_dbg(phy->dev, "%s: intr_mask = %x\n",
__func__, intr_mask);
/* Makes sure that above write goes through */
wmb();
qusb_phy_enable_clocks(qphy, false);