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Message-Id: <1699274786-73881-2-git-send-email-qianyu@qti.qualcomm.com>
Date: Mon, 6 Nov 2023 20:46:25 +0800
From: Qiang Yu <qianyu@....qualcomm.com>
To: mani@...nel.org, quic_jhugo@...cinc.com
Cc: mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
linux-kernel@...r.kernel.org, quic_cang@...cinc.com,
quic_mrana@...cinc.com, Qiang Yu <quic_qianyu@...cinc.com>
Subject: [PATCH v2 1/2] bus: mhi: host: Add a separate timeout parameter for waiting ready
From: Qiang Yu <quic_qianyu@...cinc.com>
Some devices(eg. SDX75) take longer than expected (default, 8 seconds) to
set ready after reboot. Hence add optional ready timeout parameter and pass
the appropriate timeout value to mhi_poll_reg_field() to wait enough for
device ready as part of power up sequence.
Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
drivers/bus/mhi/host/init.c | 1 +
drivers/bus/mhi/host/internal.h | 2 +-
drivers/bus/mhi/host/main.c | 5 +++--
drivers/bus/mhi/host/pm.c | 24 +++++++++++++++++-------
include/linux/mhi.h | 4 ++++
5 files changed, 26 insertions(+), 10 deletions(-)
diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
index f78aefd..65ceac1 100644
--- a/drivers/bus/mhi/host/init.c
+++ b/drivers/bus/mhi/host/init.c
@@ -881,6 +881,7 @@ static int parse_config(struct mhi_controller *mhi_cntrl,
if (!mhi_cntrl->timeout_ms)
mhi_cntrl->timeout_ms = MHI_TIMEOUT_MS;
+ mhi_cntrl->ready_timeout_ms = config->ready_timeout_ms;
mhi_cntrl->bounce_buf = config->use_bounce_buf;
mhi_cntrl->buffer_len = config->buf_len;
if (!mhi_cntrl->buffer_len)
diff --git a/drivers/bus/mhi/host/internal.h b/drivers/bus/mhi/host/internal.h
index 2e139e7..30ac415 100644
--- a/drivers/bus/mhi/host/internal.h
+++ b/drivers/bus/mhi/host/internal.h
@@ -321,7 +321,7 @@ int __must_check mhi_read_reg_field(struct mhi_controller *mhi_cntrl,
u32 *out);
int __must_check mhi_poll_reg_field(struct mhi_controller *mhi_cntrl,
void __iomem *base, u32 offset, u32 mask,
- u32 val, u32 delayus);
+ u32 val, u32 delayus, u32 timeout_ms);
void mhi_write_reg(struct mhi_controller *mhi_cntrl, void __iomem *base,
u32 offset, u32 val);
int __must_check mhi_write_reg_field(struct mhi_controller *mhi_cntrl,
diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c
index dcf627b..6cf1145 100644
--- a/drivers/bus/mhi/host/main.c
+++ b/drivers/bus/mhi/host/main.c
@@ -40,10 +40,11 @@ int __must_check mhi_read_reg_field(struct mhi_controller *mhi_cntrl,
int __must_check mhi_poll_reg_field(struct mhi_controller *mhi_cntrl,
void __iomem *base, u32 offset,
- u32 mask, u32 val, u32 delayus)
+ u32 mask, u32 val, u32 delayus,
+ u32 timeout_ms)
{
int ret;
- u32 out, retry = (mhi_cntrl->timeout_ms * 1000) / delayus;
+ u32 out, retry = (timeout_ms * 1000) / delayus;
while (retry--) {
ret = mhi_read_reg_field(mhi_cntrl, base, offset, mask, &out);
diff --git a/drivers/bus/mhi/host/pm.c b/drivers/bus/mhi/host/pm.c
index 8a4362d..a2f2fee 100644
--- a/drivers/bus/mhi/host/pm.c
+++ b/drivers/bus/mhi/host/pm.c
@@ -163,6 +163,7 @@ int mhi_ready_state_transition(struct mhi_controller *mhi_cntrl)
enum mhi_pm_state cur_state;
struct device *dev = &mhi_cntrl->mhi_dev->dev;
u32 interval_us = 25000; /* poll register field every 25 milliseconds */
+ u32 timeout_ms;
int ret, i;
/* Check if device entered error state */
@@ -173,14 +174,18 @@ int mhi_ready_state_transition(struct mhi_controller *mhi_cntrl)
/* Wait for RESET to be cleared and READY bit to be set by the device */
ret = mhi_poll_reg_field(mhi_cntrl, mhi_cntrl->regs, MHICTRL,
- MHICTRL_RESET_MASK, 0, interval_us);
+ MHICTRL_RESET_MASK, 0, interval_us,
+ mhi_cntrl->timeout_ms);
if (ret) {
dev_err(dev, "Device failed to clear MHI Reset\n");
return ret;
}
+ timeout_ms = mhi_cntrl->ready_timeout_ms ?
+ mhi_cntrl->ready_timeout_ms : mhi_cntrl->timeout_ms;
ret = mhi_poll_reg_field(mhi_cntrl, mhi_cntrl->regs, MHISTATUS,
- MHISTATUS_READY_MASK, 1, interval_us);
+ MHISTATUS_READY_MASK, 1, interval_us,
+ timeout_ms);
if (ret) {
dev_err(dev, "Device failed to enter MHI Ready\n");
return ret;
@@ -479,7 +484,7 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl)
/* Wait for the reset bit to be cleared by the device */
ret = mhi_poll_reg_field(mhi_cntrl, mhi_cntrl->regs, MHICTRL,
- MHICTRL_RESET_MASK, 0, 25000);
+ MHICTRL_RESET_MASK, 0, 25000, mhi_cntrl->timeout_ms);
if (ret)
dev_err(dev, "Device failed to clear MHI Reset\n");
@@ -492,8 +497,8 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl)
if (!MHI_IN_PBL(mhi_get_exec_env(mhi_cntrl))) {
/* wait for ready to be set */
ret = mhi_poll_reg_field(mhi_cntrl, mhi_cntrl->regs,
- MHISTATUS,
- MHISTATUS_READY_MASK, 1, 25000);
+ MHISTATUS, MHISTATUS_READY_MASK,
+ 1, 25000, mhi_cntrl->timeout_ms);
if (ret)
dev_err(dev, "Device failed to enter READY state\n");
}
@@ -1111,7 +1116,8 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl)
if (state == MHI_STATE_SYS_ERR) {
mhi_set_mhi_state(mhi_cntrl, MHI_STATE_RESET);
ret = mhi_poll_reg_field(mhi_cntrl, mhi_cntrl->regs, MHICTRL,
- MHICTRL_RESET_MASK, 0, interval_us);
+ MHICTRL_RESET_MASK, 0, interval_us,
+ mhi_cntrl->timeout_ms);
if (ret) {
dev_info(dev, "Failed to reset MHI due to syserr state\n");
goto error_exit;
@@ -1202,14 +1208,18 @@ EXPORT_SYMBOL_GPL(mhi_power_down);
int mhi_sync_power_up(struct mhi_controller *mhi_cntrl)
{
int ret = mhi_async_power_up(mhi_cntrl);
+ u32 timeout_ms;
if (ret)
return ret;
+ /* Some devices need more time to set ready during power up */
+ timeout_ms = mhi_cntrl->ready_timeout_ms ?
+ mhi_cntrl->ready_timeout_ms : mhi_cntrl->timeout_ms;
wait_event_timeout(mhi_cntrl->state_event,
MHI_IN_MISSION_MODE(mhi_cntrl->ee) ||
MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state),
- msecs_to_jiffies(mhi_cntrl->timeout_ms));
+ msecs_to_jiffies(timeout_ms));
ret = (MHI_IN_MISSION_MODE(mhi_cntrl->ee)) ? 0 : -ETIMEDOUT;
if (ret)
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index 039943e..d0f9b522 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -266,6 +266,7 @@ struct mhi_event_config {
* struct mhi_controller_config - Root MHI controller configuration
* @max_channels: Maximum number of channels supported
* @timeout_ms: Timeout value for operations. 0 means use default
+ * @ready_timeout_ms: Timeout value for waiting device to be ready (optional)
* @buf_len: Size of automatically allocated buffers. 0 means use default
* @num_channels: Number of channels defined in @ch_cfg
* @ch_cfg: Array of defined channels
@@ -277,6 +278,7 @@ struct mhi_event_config {
struct mhi_controller_config {
u32 max_channels;
u32 timeout_ms;
+ u32 ready_timeout_ms;
u32 buf_len;
u32 num_channels;
const struct mhi_channel_config *ch_cfg;
@@ -330,6 +332,7 @@ struct mhi_controller_config {
* @pm_mutex: Mutex for suspend/resume operation
* @pm_lock: Lock for protecting MHI power management state
* @timeout_ms: Timeout in ms for state transitions
+ * @ready_timeout_ms: Timeout in ms for waiting device to be ready (optional)
* @pm_state: MHI power management state
* @db_access: DB access states
* @ee: MHI device execution environment
@@ -419,6 +422,7 @@ struct mhi_controller {
struct mutex pm_mutex;
rwlock_t pm_lock;
u32 timeout_ms;
+ u32 ready_timeout_ms;
u32 pm_state;
u32 db_access;
enum mhi_ee_type ee;
--
2.7.4
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