Hello Marc,
On 5/19/23 2:16 AM, Marc Kleine-Budde wrote:
On 18.05.2023 14:36:13, Judith Mendez wrote:
Add an hrtimer to MCAN class device. Each MCAN will have its own
hrtimer instantiated if there is no hardware interrupt found and
poll-interval property is defined in device tree M_CAN node.
The hrtimer will generate a software interrupt every 1 ms. In
hrtimer callback, we check if there is a transaction pending by
reading a register, then process by calling the isr if there is.
Signed-off-by: Judith Mendez <jm@xxxxxx>
[...]
Missed this poll-interval, thanks.
diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c
index 94dc82644113..3e60cebd9d12 100644
--- a/drivers/net/can/m_can/m_can_platform.c
+++ b/drivers/net/can/m_can/m_can_platform.c
@@ -5,6 +5,7 @@
//
// Copyright (C) 2018-19 Texas Instruments Incorporated - http://www.ti.com/
+#include <linux/hrtimer.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
@@ -96,12 +97,40 @@ static int m_can_plat_probe(struct platform_device *pdev)
goto probe_fail;
addr = devm_platform_ioremap_resource_byname(pdev, "m_can");
- irq = platform_get_irq_byname(pdev, "int0");
- if (IS_ERR(addr) || irq < 0) {
- ret = -EINVAL;
+ if (IS_ERR(addr)) {
+ ret = PTR_ERR(addr);
goto probe_fail;
}
As we don't use an explicit "poll-interval" anymore, this needs some
cleanup. The flow should be (pseudo code, error handling omitted):
if (device_property_present("interrupts") {
platform_get_irq_byname();
polling = false;
} else {
hrtimer_init();
polling = true;
}
Ok.
+ irq = platform_get_irq_byname_optional(pdev, "int0");
Remove the "_optional" and....
On V2, you asked to add the _optional?.....
> irq = platform_get_irq_byname(pdev, "int0");
use platform_get_irq_byname_optional(), it doesn't print an error
message.
+ if (irq == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ goto probe_fail;
+ }
+
+ if (device_property_present(mcan_class->dev, "interrupts") ||
+ device_property_present(mcan_class->dev, "interrupt-names"))
+ mcan_class->polling = false;
...move the platform_get_irq_byname() here
ok,
+ else
+ mcan_class->polling = true;
+
+ if (!mcan_class->polling && irq < 0) {
+ ret = -ENXIO;
+ dev_err_probe(mcan_class->dev, ret, "IRQ int0 not found, polling not activated\n");
+ goto probe_fail;
+ }
Remove this check.
Should we not go to 'probe fail' if polling is not activated and irq is
not found?
+
+ if (mcan_class->polling) {
+ if (irq > 0) {
+ mcan_class->polling = false;
+ dev_info(mcan_class->dev, "Polling enabled, using hardware IRQ\n");
Remove this.
Remove the dev_info?
+ } else {
+ dev_dbg(mcan_class->dev, "Polling enabled, initialize hrtimer");
+ hrtimer_init(&mcan_class->hrtimer, CLOCK_MONOTONIC,
+ HRTIMER_MODE_REL_PINNED);
move this backwards, where you set "polling = true"
ok,
+ }
+ }
+
/* message ram could be shared */
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "message_ram");
if (!res) {
--
2.17.1
- judith
