We have more use cases need to consider for vbus/id handler, below are
current use cases we know now:
- The vbus/id value can be read from external connectors, eg, gpio
- The vbus/id value can be read from register OTGSC
- The vbus is always on
- There is no ID pin, but need to switch role through debugfs
So, in order to cover all cases, we improve the OTG handler like below:
- ci->is_otg flag means it is OTG controller, and the register OTGSC can
be accessed, but vbus/id value from OTG registers are not mandatory.
- ci_otg workqueue is used to get id/vbus value, no matter the values are
from extcon or register OTGSC.
- When we try to get id/vbus value, we try to get them from extcon first,
then from register OTGSC.
- Introduce two new APIs ci_write_otgsc and ci_read_otgsc to get vbus and
id value. The hw_read_otgsc and hw_read_otgsc are only used to access
OTGSC register at OTG FSM mode only.
Signed-off-by: Peter Chen <peter.chen@xxxxxxx>
cc: Sanchayan Maity <maitysanchayan@xxxxxxxxx>
cc: ivan.ivanov@xxxxxxxxxx
---
drivers/usb/chipidea/ci.h | 5 +-
drivers/usb/chipidea/core.c | 43 ++++++----------
drivers/usb/chipidea/debug.c | 6 +--
drivers/usb/chipidea/otg.c | 116 ++++++++++++++++++++++++++++---------------
drivers/usb/chipidea/otg.h | 2 +
drivers/usb/chipidea/udc.c | 10 ++--
6 files changed, 103 insertions(+), 79 deletions(-)
diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index f81dd3b..07141a6 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -162,7 +162,7 @@ struct hw_bank {
* @irq: IRQ number
* @roles: array of supported roles for this controller
* @role: current role
- * @is_otg: if the device is otg-capable
+ * @is_otg: if the device is otg-capable (the register OTGSC can be accessed)
* @fsm: otg finite state machine
* @otg_fsm_hrtimer: hrtimer for otg fsm timers
* @hr_timeouts: time out list for active otg fsm timers
@@ -200,6 +200,8 @@ struct hw_bank {
* @wakeup_int: if wakeup interrupt occur
* @rev: The revision number for controller
* @dp_always_pullup: keep dp always pullup at device mode
+ * @fake_otgsc: record id/vbus status when these two values are not from
+ * registers
*/
struct ci_hdrc {
struct device *dev;
@@ -250,6 +252,7 @@ struct ci_hdrc {
bool wakeup_int;
enum ci_revision rev;
bool dp_always_pullup;
+ u32 fake_otgsc;
};
static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 6f22c6c..b37bc52 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -562,23 +562,21 @@ static irqreturn_t ci_irq(int irq, void *data)
return IRQ_HANDLED;
}
- if (ci->is_otg) {
- otgsc = hw_read_otgsc(ci, ~0);
- if (ci_otg_is_fsm_mode(ci)) {
- ret = ci_otg_fsm_irq(ci);
- if (ret == IRQ_HANDLED)
- return ret;
- }
+ otgsc = ci_read_otgsc(ci, ~0);
+ if (ci_otg_is_fsm_mode(ci)) {
+ ret = ci_otg_fsm_irq(ci);
+ if (ret == IRQ_HANDLED)
+ return ret;
}
/*
* Handle id change interrupt, it indicates device/host function
* switch.
*/
- if (ci->is_otg && (otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
+ if ((otgsc & OTGSC_IDIE) && (otgsc & OTGSC_IDIS)) {
ci->id_event = true;
/* Clear ID change irq status */
- hw_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
+ ci_write_otgsc(ci, OTGSC_IDIS, OTGSC_IDIS);
ci_otg_queue_work(ci);
return IRQ_HANDLED;
}
@@ -587,10 +585,10 @@ static irqreturn_t ci_irq(int irq, void *data)
* Handle vbus change interrupt, it indicates device connection
* and disconnection events.
*/
- if (ci->is_otg && (otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
+ if ((otgsc & OTGSC_BSVIE) && (otgsc & OTGSC_BSVIS)) {
ci->b_sess_valid_event = true;
/* Clear BSV irq */
- hw_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
+ ci_write_otgsc(ci, OTGSC_BSVIS, OTGSC_BSVIS);
ci_otg_queue_work(ci);
return IRQ_HANDLED;
}
@@ -909,12 +907,12 @@ static void ci_get_otg_capable(struct ci_hdrc *ci)
ci->is_otg = (hw_read(ci, CAP_DCCPARAMS,
DCCPARAMS_DC | DCCPARAMS_HC)
== (DCCPARAMS_DC | DCCPARAMS_HC));
- if (ci->is_otg) {
- dev_dbg(ci->dev, "It is OTG capable controller\n");
- /* Disable and clear all OTG irq */
- hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
- OTGSC_INT_STATUS_BITS);
- }
+ /* Disable and clear all OTG irq */
+ ci_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
+ OTGSC_INT_STATUS_BITS);
+
+ dev_dbg(ci->dev, "It is %sOTG capable controller\n",
+ ci->is_otg ? "" : "non-");
}
static int ci_hdrc_probe(struct platform_device *pdev)
@@ -1023,18 +1021,9 @@ static int ci_hdrc_probe(struct platform_device *pdev)
}
if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
- if (ci->is_otg) {
ci->role = ci_otg_role(ci);
/* Enable ID change irq */
- hw_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
- } else {
- /*
- * If the controller is not OTG capable, but support
- * role switch, the defalt role is gadget, and the
- * user can switch it through debugfs.
- */
- ci->role = CI_ROLE_GADGET;
- }
+ ci_write_otgsc(ci, OTGSC_IDIE, OTGSC_IDIE);
} else {
ci->role = ci->roles[CI_ROLE_HOST]
? CI_ROLE_HOST
diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 6d23eed..91b8c26 100644
--- a/drivers/usb/chipidea/debug.c
+++ b/drivers/usb/chipidea/debug.c
@@ -367,10 +367,8 @@ static int ci_registers_show(struct seq_file *s, void *unused)
tmp_reg = hw_read(ci, OP_PORTSC, ~0);
seq_printf(s, "PORTSC reg: %08x\n", tmp_reg);
- if (ci->is_otg) {
- tmp_reg = hw_read_otgsc(ci, ~0);
- seq_printf(s, "OTGSC reg: %08x\n", tmp_reg);
- }
+ tmp_reg = ci_read_otgsc(ci, ~0);
+ seq_printf(s, "OTGSC(may be fake one) reg : %08x\n", tmp_reg);
return 0;
}
diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
index 58be59e..b02a80e 100644
--- a/drivers/usb/chipidea/otg.c
+++ b/drivers/usb/chipidea/otg.c
@@ -25,53 +25,76 @@
#include "otg_fsm.h"
/**
- * hw_read_otgsc returns otgsc register bits value.
+ * hw_read_otgsc returns otgsc register bits value, for OTG FSM only.
* @mask: bitfield mask
*/
u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask)
{
- struct ci_hdrc_cable *cable;
- u32 val = hw_read(ci, OP_OTGSC, mask);
-
- /*
- * If using extcon framework for VBUS and/or ID signal
- * detection overwrite OTGSC register value
- */
- cable = &ci->platdata->vbus_extcon;
- if (!IS_ERR(cable->edev)) {
- if (cable->changed)
- val |= OTGSC_BSVIS;
- else
- val &= ~OTGSC_BSVIS;
-
- cable->changed = false;
-
- if (cable->state)
- val |= OTGSC_BSV;
- else
- val &= ~OTGSC_BSV;
- }
-
- cable = &ci->platdata->id_extcon;
- if (!IS_ERR(cable->edev)) {
- if (cable->changed)
- val |= OTGSC_IDIS;
- else
- val &= ~OTGSC_IDIS;
-
- cable->changed = false;
+ return hw_read(ci, OP_OTGSC, mask);
+}
- if (cable->state)
- val |= OTGSC_ID;
- else
- val &= ~OTGSC_ID;
+/**
+ * ci_read_otgsc returns otgsc bits value.
+ * The value may from:
+ * - register OTGSC
+ * - extcon status
+ *
+ * @ci: the controller struct
+ * @mask: bitfield mask
+ */
+u32 ci_read_otgsc(struct ci_hdrc *ci, u32 mask)
+{
+ struct ci_hdrc_cable *cable_vbus;
+ struct ci_hdrc_cable *cable_id;
+ u32 val = ci->fake_otgsc;
+
+ cable_vbus = &ci->platdata->vbus_extcon;
+ cable_id = &ci->platdata->vbus_extcon;
+ if (!IS_ERR(cable_vbus->edev) || !IS_ERR(cable_id->edev)) {
+ if (!IS_ERR(cable_vbus->edev)) {
+ if (cable_vbus->changed)
+ val |= OTGSC_BSVIS;
+ else
+ val &= ~OTGSC_BSVIS;
+
+ cable_vbus->changed = false;
+
+ if (cable_vbus->state)
+ val |= OTGSC_BSV;
+ else
+ val &= ~OTGSC_BSV;
+ }
+
+ if (!IS_ERR(cable_id->edev)) {
+ if (cable_id->changed)
+ val |= OTGSC_IDIS;
+ else
+ val &= ~OTGSC_IDIS;
+
+ cable_id->changed = false;
+
+ if (cable_id->state)
+ val |= OTGSC_ID;
+ else
+ val &= ~OTGSC_ID;
+ }
+ return val;
+ } else if (ci->is_otg) { /* read otgsc from register */
+ return hw_read_otgsc(ci, mask);
+ } else if (mask == OTGSC_ID) {
+ /*
+ * Can't decide role from external pin, but the controller
+ * is dual role, we take the default role as gadget,
+ * and the user can switch it through debugfs.
+ */
+ return OTGSC_ID;
+ } else {
+ return 0;
}
-
- return val;
}
/**
- * hw_write_otgsc updates target bits of OTGSC register.
+ * hw_write_otgsc updates target bits of OTGSC register, for OTG FSM only
* @mask: bitfield mask
* @data: to be written
*/
@@ -81,12 +104,23 @@ void hw_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data)
}
/**
+ * ci_write_otgsc: only update register for OTG controller
+ * @mask: bitfield mask
+ * @data: to be written
+ */
+void ci_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data)
+{
+ if (ci->is_otg)
+ hw_write_otgsc(ci, mask, data);
+}
+
+/**
* ci_otg_role - pick role based on ID pin state
* @ci: the controller
*/
enum ci_role ci_otg_role(struct ci_hdrc *ci)
{
- enum ci_role role = hw_read_otgsc(ci, OTGSC_ID)
+ enum ci_role role = ci_read_otgsc(ci, OTGSC_ID)
? CI_ROLE_GADGET
: CI_ROLE_HOST;
@@ -100,7 +134,7 @@ void ci_handle_vbus_change(struct ci_hdrc *ci)
return;
}
- if (hw_read_otgsc(ci, OTGSC_BSV))
+ if (ci_read_otgsc(ci, OTGSC_BSV))
usb_gadget_vbus_connect(&ci->gadget);
else
usb_gadget_vbus_disconnect(&ci->gadget);
@@ -183,7 +217,7 @@ void ci_hdrc_otg_destroy(struct ci_hdrc *ci)
destroy_workqueue(ci->wq);
}
/* Disable all OTG irq and clear status */
- hw_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
+ ci_write_otgsc(ci, OTGSC_INT_EN_BITS | OTGSC_INT_STATUS_BITS,
OTGSC_INT_STATUS_BITS);
if (ci_otg_is_fsm_mode(ci))
ci_hdrc_otg_fsm_remove(ci);
diff --git a/drivers/usb/chipidea/otg.h b/drivers/usb/chipidea/otg.h
index 9ecb598..26b6548 100644
--- a/drivers/usb/chipidea/otg.h
+++ b/drivers/usb/chipidea/otg.h
@@ -12,7 +12,9 @@
#define __DRIVERS_USB_CHIPIDEA_OTG_H
u32 hw_read_otgsc(struct ci_hdrc *ci, u32 mask);
+u32 ci_read_otgsc(struct ci_hdrc *ci, u32 mask);
void hw_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data);
+void ci_write_otgsc(struct ci_hdrc *ci, u32 mask, u32 data);
int ci_hdrc_otg_init(struct ci_hdrc *ci);
void ci_hdrc_otg_destroy(struct ci_hdrc *ci);
enum ci_role ci_otg_role(struct ci_hdrc *ci);
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index 065f5d9..6986a50 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1956,10 +1956,9 @@ void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
static int udc_id_switch_for_device(struct ci_hdrc *ci)
{
- if (ci->is_otg)
- /* Clear and enable BSV irq */
- hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
- OTGSC_BSVIS | OTGSC_BSVIE);
+ /* Clear and enable BSV irq */
+ ci_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
+ OTGSC_BSVIS | OTGSC_BSVIE);
return 0;
}
@@ -1970,8 +1969,7 @@ static void udc_id_switch_for_host(struct ci_hdrc *ci)
* host doesn't care B_SESSION_VALID event
* so clear and disbale BSV irq
*/
- if (ci->is_otg)
- hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
+ ci_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
}
/**
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
