/*
* Texas Instruments System Control Interface Protocol Driver
*
- * Copyright (C) 2015-2016 Texas Instruments Incorporated - https://www.ti.com/
+ * Copyright (C) 2015-2022 Texas Instruments Incorporated - https://www.ti.com/
* Nishanth Menon
*/
#include <linux/debugfs.h>
#include <linux/export.h>
#include <linux/io.h>
+#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
* @node: list head
* @host_id: Host ID
* @users: Number of users of this instance
+ * @is_suspending: Flag set to indicate in suspend path.
*/
struct ti_sci_info {
struct device *dev;
u8 host_id;
/* protected by ti_sci_list_mutex */
int users;
-
+ bool is_suspending;
};
#define cl_to_ti_sci_info(c) container_of(c, struct ti_sci_info, cl)
hdr = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
xfer->tx_message.len = tx_message_size;
+ xfer->tx_message.chan_rx = info->chan_rx;
+ xfer->tx_message.timeout_rx_ms = info->desc->max_rx_timeout_ms;
xfer->rx_len = (u8)rx_message_size;
reinit_completion(&xfer->done);
int ret;
int timeout;
struct device *dev = info->dev;
+ bool done_state = true;
ret = mbox_send_message(info->chan_tx, &xfer->tx_message);
if (ret < 0)
ret = 0;
- /* And we wait for the response. */
- timeout = msecs_to_jiffies(info->desc->max_rx_timeout_ms);
- if (!wait_for_completion_timeout(&xfer->done, timeout)) {
+ if (!info->is_suspending) {
+ /* And we wait for the response. */
+ timeout = msecs_to_jiffies(info->desc->max_rx_timeout_ms);
+ if (!wait_for_completion_timeout(&xfer->done, timeout))
+ ret = -ETIMEDOUT;
+ } else {
+ /*
+ * If we are suspending, we cannot use wait_for_completion_timeout
+ * during noirq phase, so we must manually poll the completion.
+ */
+ ret = read_poll_timeout_atomic(try_wait_for_completion, done_state,
+ true, 1,
+ info->desc->max_rx_timeout_ms * 1000,
+ false, &xfer->done);
+ }
+
+ if (ret == -ETIMEDOUT || !done_state) {
dev_err(dev, "Mbox timedout in resp(caller: %pS)\n",
(void *)_RET_IP_);
- ret = -ETIMEDOUT;
}
+
/*
* NOTE: we might prefer not to need the mailbox ticker to manage the
* transfer queueing since the protocol layer queues things by itself.
return NOTIFY_BAD;
}
+static void ti_sci_set_is_suspending(struct ti_sci_info *info, bool is_suspending)
+{
+ info->is_suspending = is_suspending;
+}
+
+static int ti_sci_suspend(struct device *dev)
+{
+ struct ti_sci_info *info = dev_get_drvdata(dev);
+ /*
+ * We must switch operation to polled mode now as drivers and the genpd
+ * layer may make late TI SCI calls to change clock and device states
+ * from the noirq phase of suspend.
+ */
+ ti_sci_set_is_suspending(info, true);
+
+ return 0;
+}
+
+static int ti_sci_resume(struct device *dev)
+{
+ struct ti_sci_info *info = dev_get_drvdata(dev);
+
+ ti_sci_set_is_suspending(info, false);
+
+ return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(ti_sci_pm_ops, ti_sci_suspend, ti_sci_resume);
+
/* Description for K2G */
static const struct ti_sci_desc ti_sci_pmmc_k2g_desc = {
.default_host_id = 2,
.driver = {
.name = "ti-sci",
.of_match_table = of_match_ptr(ti_sci_of_match),
+ .pm = &ti_sci_pm_ops,
},
};
module_platform_driver(ti_sci_driver);