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can: m_can: allow keeping the transceiver running in suspend

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Add a flag to the device class structure that leaves the chip in a
running state with rx interrupt enabled, so that an m_can device driver
can configure and use the interrupt as a wakeup source.

Signed-off-by: Martin Hundebøll <martin@geanix.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Martin Hundebøll 2023-11-13 14:14:50 +01:00 • committed by Marc Kleine-Budde
parent b00cf4f629
commit 4a94d7e31c
5 changed files with 21 additions and 5 deletions
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14
drivers/net/can/m_can/m_can.c
View file

@ -2382,7 +2382,15 @@ int m_can_class_suspend(struct device *dev)
if (netif_running(ndev)) {
netif_stop_queue(ndev);
netif_device_detach(ndev);
/* leave the chip running with rx interrupt enabled if it is
* used as a wake-up source.
*/
if (cdev->pm_wake_source)
m_can_write(cdev, M_CAN_IE, IR_RF0N);
else
m_can_stop(ndev);
m_can_clk_stop(cdev);
}
@ -2409,12 +2417,16 @@ int m_can_class_resume(struct device *dev)
ret = m_can_clk_start(cdev);
if (ret)
return ret;
if (cdev->pm_wake_source) {
m_can_write(cdev, M_CAN_IE, cdev->active_interrupts);
} else {
ret = m_can_start(ndev);
if (ret) {
m_can_clk_stop(cdev);
return ret;
}
}
netif_device_attach(ndev);
netif_start_queue(ndev);

1
drivers/net/can/m_can/m_can.h
View file

@ -97,6 +97,7 @@ struct m_can_classdev {
u32 irqstatus;
int pm_clock_support;
int pm_wake_source;
int is_peripheral;
// Cached M_CAN_IE register content

1
drivers/net/can/m_can/m_can_pci.c
View file

@ -125,6 +125,7 @@ static int m_can_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
mcan_class->dev = &pci->dev;
mcan_class->net->irq = pci_irq_vector(pci, 0);
mcan_class->pm_clock_support = 1;
mcan_class->pm_wake_source = 0;
mcan_class->can.clock.freq = id->driver_data;
mcan_class->ops = &m_can_pci_ops;

1
drivers/net/can/m_can/m_can_platform.c
View file

@ -139,6 +139,7 @@ static int m_can_plat_probe(struct platform_device *pdev)
mcan_class->net->irq = irq;
mcan_class->pm_clock_support = 1;
mcan_class->pm_wake_source = 0;
mcan_class->can.clock.freq = clk_get_rate(mcan_class->cclk);
mcan_class->dev = &pdev->dev;
mcan_class->transceiver = transceiver;

1
drivers/net/can/m_can/tcan4x5x-core.c
View file

@ -411,6 +411,7 @@ static int tcan4x5x_can_probe(struct spi_device *spi)
priv->spi = spi;
mcan_class->pm_clock_support = 0;
mcan_class->pm_wake_source = 0;
mcan_class->can.clock.freq = freq;
mcan_class->dev = &spi->dev;
mcan_class->ops = &tcan4x5x_ops;