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Message-Id: <20200917173926.24266-5-elder@linaro.org>
Date: Thu, 17 Sep 2020 12:39:23 -0500
From: Alex Elder <elder@...aro.org>
To: davem@...emloft.net, kuba@...nel.org
Cc: evgreen@...omium.org, subashab@...eaurora.org,
cpratapa@...eaurora.org, bjorn.andersson@...aro.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next v3 4/7] net: ipa: use device_init_wakeup()
The call to wakeup_source_register() in ipa_probe() does not do what
it was intended to do. Call device_init_wakeup() in ipa_setup()
instead, to set the IPA device as wakeup-capable and to initially
enable wakeup capability.
When we receive a SUSPEND interrupt, call pm_wakeup_dev_event()
with a zero processing time, to simply call for a resume without
any other processing. The ipa_resume() call will take care of
waking things up again, and will handle receiving the packet.
Note that this gets rid of a clock reference counting bug that
occurred when handling an IPA SUSPEND interrupt. Specifically,
ipa_suspend_handler() took an IPA clock reference *in addition*
to the one taken by ipa_resume(). There is no need to back-port
this fix however, because it only affects code that was not
previously working (this patch is part of fixing that).
Signed-off-by: Alex Elder <elder@...aro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
v3: Added Bjorn's reviewed-by tag.
drivers/net/ipa/ipa.h | 2 --
drivers/net/ipa/ipa_main.c | 42 ++++++++++++++++----------------------
2 files changed, 18 insertions(+), 26 deletions(-)
diff --git a/drivers/net/ipa/ipa.h b/drivers/net/ipa/ipa.h
index e02fe979b645b..c688155ccf375 100644
--- a/drivers/net/ipa/ipa.h
+++ b/drivers/net/ipa/ipa.h
@@ -114,8 +114,6 @@ struct ipa {
void *zero_virt;
size_t zero_size;
- struct wakeup_source *wakeup_source;
-
/* Bit masks indicating endpoint state */
u32 available; /* supported by hardware */
u32 filter_map;
diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index 4d5394bcfe47e..4e2508bb1bf80 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -75,17 +75,19 @@
* @ipa: IPA pointer
* @irq_id: IPA interrupt type (unused)
*
- * When in suspended state, the IPA can trigger a resume by sending a SUSPEND
- * IPA interrupt.
+ * If an RX endpoint is in suspend state, and the IPA has a packet
+ * destined for that endpoint, the IPA generates a SUSPEND interrupt
+ * to inform the AP that it should resume the endpoint. If we get
+ * one of these interrupts we just resume everything.
*/
static void ipa_suspend_handler(struct ipa *ipa, enum ipa_irq_id irq_id)
{
- /* Take a a single clock reference to prevent suspend. All
- * endpoints will be resumed as a result. This reference will
- * be dropped when we get a power management suspend request.
+ /* Just report the event, and let system resume handle the rest.
+ * More than one endpoint could signal this; if so, ignore
+ * all but the first.
*/
if (!test_and_set_bit(IPA_FLAG_CLOCK_HELD, ipa->flags))
- ipa_clock_get(ipa);
+ pm_wakeup_dev_event(&ipa->pdev->dev, 0, true);
/* Acknowledge/clear the suspend interrupt on all endpoints */
ipa_interrupt_suspend_clear_all(ipa->interrupt);
@@ -106,6 +108,7 @@ int ipa_setup(struct ipa *ipa)
{
struct ipa_endpoint *exception_endpoint;
struct ipa_endpoint *command_endpoint;
+ struct device *dev = &ipa->pdev->dev;
int ret;
/* Setup for IPA v3.5.1 has some slight differences */
@@ -123,6 +126,10 @@ int ipa_setup(struct ipa *ipa)
ipa_uc_setup(ipa);
+ ret = device_init_wakeup(dev, true);
+ if (ret)
+ goto err_uc_teardown;
+
ipa_endpoint_setup(ipa);
/* We need to use the AP command TX endpoint to perform other
@@ -158,7 +165,7 @@ int ipa_setup(struct ipa *ipa)
ipa->setup_complete = true;
- dev_info(&ipa->pdev->dev, "IPA driver setup completed successfully\n");
+ dev_info(dev, "IPA driver setup completed successfully\n");
return 0;
@@ -173,6 +180,8 @@ int ipa_setup(struct ipa *ipa)
ipa_endpoint_disable_one(command_endpoint);
err_endpoint_teardown:
ipa_endpoint_teardown(ipa);
+ (void)device_init_wakeup(dev, false);
+err_uc_teardown:
ipa_uc_teardown(ipa);
ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_TX_SUSPEND);
ipa_interrupt_teardown(ipa->interrupt);
@@ -200,6 +209,7 @@ static void ipa_teardown(struct ipa *ipa)
command_endpoint = ipa->name_map[IPA_ENDPOINT_AP_COMMAND_TX];
ipa_endpoint_disable_one(command_endpoint);
ipa_endpoint_teardown(ipa);
+ (void)device_init_wakeup(&ipa->pdev->dev, false);
ipa_uc_teardown(ipa);
ipa_interrupt_remove(ipa->interrupt, IPA_IRQ_TX_SUSPEND);
ipa_interrupt_teardown(ipa->interrupt);
@@ -709,7 +719,6 @@ static void ipa_validate_build(void)
*/
static int ipa_probe(struct platform_device *pdev)
{
- struct wakeup_source *wakeup_source;
struct device *dev = &pdev->dev;
const struct ipa_data *data;
struct ipa_clock *clock;
@@ -758,19 +767,11 @@ static int ipa_probe(struct platform_device *pdev)
goto err_clock_exit;
}
- /* Create a wakeup source. */
- wakeup_source = wakeup_source_register(dev, "ipa");
- if (!wakeup_source) {
- /* The most likely reason for failure is memory exhaustion */
- ret = -ENOMEM;
- goto err_clock_exit;
- }
-
/* Allocate and initialize the IPA structure */
ipa = kzalloc(sizeof(*ipa), GFP_KERNEL);
if (!ipa) {
ret = -ENOMEM;
- goto err_wakeup_source_unregister;
+ goto err_clock_exit;
}
ipa->pdev = pdev;
@@ -778,7 +779,6 @@ static int ipa_probe(struct platform_device *pdev)
ipa->modem_rproc = rproc;
ipa->clock = clock;
__clear_bit(IPA_FLAG_CLOCK_HELD, ipa->flags);
- ipa->wakeup_source = wakeup_source;
ipa->version = data->version;
ret = ipa_reg_init(ipa);
@@ -857,8 +857,6 @@ static int ipa_probe(struct platform_device *pdev)
ipa_reg_exit(ipa);
err_kfree_ipa:
kfree(ipa);
-err_wakeup_source_unregister:
- wakeup_source_unregister(wakeup_source);
err_clock_exit:
ipa_clock_exit(clock);
err_rproc_put:
@@ -872,11 +870,8 @@ static int ipa_remove(struct platform_device *pdev)
struct ipa *ipa = dev_get_drvdata(&pdev->dev);
struct rproc *rproc = ipa->modem_rproc;
struct ipa_clock *clock = ipa->clock;
- struct wakeup_source *wakeup_source;
int ret;
- wakeup_source = ipa->wakeup_source;
-
if (ipa->setup_complete) {
ret = ipa_modem_stop(ipa);
if (ret)
@@ -893,7 +888,6 @@ static int ipa_remove(struct platform_device *pdev)
ipa_mem_exit(ipa);
ipa_reg_exit(ipa);
kfree(ipa);
- wakeup_source_unregister(wakeup_source);
ipa_clock_exit(clock);
rproc_put(rproc);
--
2.20.1
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