usb: chipidea: imx: Fix Battery Charger 1.2 CDP detection

i.MX8MM cannot detect certain CDP USB HUBs. usbmisc_imx.c driver is not
following CDP timing requirements defined by USB BC 1.2 specification
and section 3.2.4 Detection Timing CDP.

During Primary Detection the i.MX device should turn on VDP_SRC and
IDM_SINK for a minimum of 40ms (TVDPSRC_ON). After a time of TVDPSRC_ON,
the i.MX is allowed to check the status of the D- line. Current
implementation is waiting between 1ms and 2ms, and certain BC 1.2
complaint USB HUBs cannot be detected. Increase delay to 40ms allowing
enough time for primary detection.

During secondary detection the i.MX is required to disable VDP_SRC and
IDM_SNK, and enable VDM_SRC and IDP_SINK for at least 40ms (TVDMSRC_ON).

Current implementation is not disabling VDP_SRC and IDM_SNK, introduce
disable sequence in imx7d_charger_secondary_detection() function.

VDM_SRC and IDP_SINK should be enabled for at least 40ms (TVDMSRC_ON).
Increase delay allowing enough time for detection.

Cc: <[email protected]>
Fixes: 746f316b753a ("usb: chipidea: introduce imx7d USB charger detection")
Signed-off-by: Breno Lima <[email protected]>
Signed-off-by: Jun Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Peter Chen <[email protected]>

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 4545b23bda3f1c69df8158dae429580b40ced1d7..bac0f5458cab9902c3a4a0ae77d0163decbf0ce2 100644 (file)
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -686,6 +686,16 @@ static int imx7d_charger_secondary_detection(struct imx_usbmisc_data *data)
        int val;
        unsigned long flags;
 
+       /* Clear VDATSRCENB0 to disable VDP_SRC and IDM_SNK required by BC 1.2 spec */
+       spin_lock_irqsave(&usbmisc->lock, flags);
+       val = readl(usbmisc->base + MX7D_USB_OTG_PHY_CFG2);
+       val &= ~MX7D_USB_OTG_PHY_CFG2_CHRG_VDATSRCENB0;
+       writel(val, usbmisc->base + MX7D_USB_OTG_PHY_CFG2);
+       spin_unlock_irqrestore(&usbmisc->lock, flags);
+
+       /* TVDMSRC_DIS */
+       msleep(20);
+
        /* VDM_SRC is connected to D- and IDP_SINK is connected to D+ */
        spin_lock_irqsave(&usbmisc->lock, flags);
        val = readl(usbmisc->base + MX7D_USB_OTG_PHY_CFG2);
@@ -695,7 +705,8 @@ static int imx7d_charger_secondary_detection(struct imx_usbmisc_data *data)
                                usbmisc->base + MX7D_USB_OTG_PHY_CFG2);
        spin_unlock_irqrestore(&usbmisc->lock, flags);
 
-       usleep_range(1000, 2000);
+       /* TVDMSRC_ON */
+       msleep(40);
 
        /*
         * Per BC 1.2, check voltage of D+:
@@ -798,7 +809,8 @@ static int imx7d_charger_primary_detection(struct imx_usbmisc_data *data)
                                usbmisc->base + MX7D_USB_OTG_PHY_CFG2);
        spin_unlock_irqrestore(&usbmisc->lock, flags);
 
-       usleep_range(1000, 2000);
+       /* TVDPSRC_ON */
+       msleep(40);
 
        /* Check if D- is less than VDAT_REF to determine an SDP per BC 1.2 */
        val = readl(usbmisc->base + MX7D_USB_OTG_PHY_STATUS);