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authorPeter Chen <peter.chen@freescale.com>2015-01-16 13:29:00 +0300
committerFelipe Balbi <balbi@ti.com>2015-01-27 18:40:46 +0300
commitefdbd3a5d6e6108f1565ab4dc4c53e77aba6fe0a (patch)
tree070e45a15a5fd11e65fa7a577e0c55bb591aeb5f /drivers/usb/phy
parent7b09e67639d6857439bae0d6276d443a7c2c9c40 (diff)
downloadlinux-efdbd3a5d6e6108f1565ab4dc4c53e77aba6fe0a.tar.xz
usb: phy: mxs: do not set PWD.RXPWD1PT1 for low speed connection
At very rare cases, the SoF will not send out after resume with low speed connection. The workaround is do not power down PWD.RXPWD1PT1 bit during the suspend. Signed-off-by: Peter Chen <peter.chen@freescale.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'drivers/usb/phy')
-rw-r--r--drivers/usb/phy/phy-mxs-usb.c47
1 files changed, 46 insertions, 1 deletions
diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c
index eb746051eda4..c3177a1757ee 100644
--- a/drivers/usb/phy/phy-mxs-usb.c
+++ b/drivers/usb/phy/phy-mxs-usb.c
@@ -70,6 +70,9 @@
#define ANADIG_USB2_LOOPBACK_SET 0x244
#define ANADIG_USB2_LOOPBACK_CLR 0x248
+#define ANADIG_USB1_MISC 0x1f0
+#define ANADIG_USB2_MISC 0x250
+
#define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG BIT(12)
#define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL BIT(11)
@@ -81,6 +84,11 @@
#define BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1 BIT(2)
#define BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN BIT(5)
+#define BM_ANADIG_USB1_MISC_RX_VPIN_FS BIT(29)
+#define BM_ANADIG_USB1_MISC_RX_VMIN_FS BIT(28)
+#define BM_ANADIG_USB2_MISC_RX_VPIN_FS BIT(29)
+#define BM_ANADIG_USB2_MISC_RX_VMIN_FS BIT(28)
+
#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)
/* Do disconnection between PHY and controller without vbus */
@@ -323,13 +331,50 @@ static void mxs_phy_shutdown(struct usb_phy *phy)
clk_disable_unprepare(mxs_phy->clk);
}
+static bool mxs_phy_is_low_speed_connection(struct mxs_phy *mxs_phy)
+{
+ unsigned int line_state;
+ /* bit definition is the same for all controllers */
+ unsigned int dp_bit = BM_ANADIG_USB1_MISC_RX_VPIN_FS,
+ dm_bit = BM_ANADIG_USB1_MISC_RX_VMIN_FS;
+ unsigned int reg = ANADIG_USB1_MISC;
+
+ /* If the SoCs don't have anatop, quit */
+ if (!mxs_phy->regmap_anatop)
+ return false;
+
+ if (mxs_phy->port_id == 0)
+ reg = ANADIG_USB1_MISC;
+ else if (mxs_phy->port_id == 1)
+ reg = ANADIG_USB2_MISC;
+
+ regmap_read(mxs_phy->regmap_anatop, reg, &line_state);
+
+ if ((line_state & (dp_bit | dm_bit)) == dm_bit)
+ return true;
+ else
+ return false;
+}
+
static int mxs_phy_suspend(struct usb_phy *x, int suspend)
{
int ret;
struct mxs_phy *mxs_phy = to_mxs_phy(x);
+ bool low_speed_connection, vbus_is_on;
+
+ low_speed_connection = mxs_phy_is_low_speed_connection(mxs_phy);
+ vbus_is_on = mxs_phy_get_vbus_status(mxs_phy);
if (suspend) {
- writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
+ /*
+ * FIXME: Do not power down RXPWD1PT1 bit for low speed
+ * connect. The low speed connection will have problem at
+ * very rare cases during usb suspend and resume process.
+ */
+ if (low_speed_connection & vbus_is_on)
+ writel(0xfffbffff, x->io_priv + HW_USBPHY_PWD);
+ else
+ writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
writel(BM_USBPHY_CTRL_CLKGATE,
x->io_priv + HW_USBPHY_CTRL_SET);
clk_disable_unprepare(mxs_phy->clk);