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platform/surface: aggregator: Defer probing when serdev is not ready by phreer · Pull Request #152 · linux-surface/kernel · GitHub

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platform/surface: aggregator: Defer probing when serdev is not ready #152

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Merged
qzed merged 2 commits into from
Apr 30, 2024
Conversation 20 Commits 2 Checks 0 Files changed
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platform/surface: aggregator: Defer probing when serdev is not ready #152

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16a9b2d
platform/surface: aggregator: Defer probing when serdev is not ready
phreer Apr 22, 2024
2e98a15
platform/surface: aggregator: Log critical errors during SAM probing
phreer Apr 24, 2024
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39 changes: 32 additions & 7 deletions drivers/platform/surface/aggregator/core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -623,8 +623,10 @@ static int ssam_serial_hub_probe(struct serdev_device *serdev)
acpi_status astatus;
int status;

if (gpiod_count(&serdev->dev, NULL) < 0)
if (gpiod_count(&serdev->dev, NULL) < 0) {
dev_err(&serdev->dev, "no GPIO found\n");
return -ENODEV;
}

status = devm_acpi_dev_add_driver_gpios(&serdev->dev, ssam_acpi_gpios);
if (status)
Expand All @@ -637,21 +639,36 @@ static int ssam_serial_hub_probe(struct serdev_device *serdev)

/* Initialize controller. */
status = ssam_controller_init(ctrl, serdev);
if (status)
if (status) {
dev_err_probe(&serdev->dev, status,
"failed to initialize ssam controller\n");
goto err_ctrl_init;
}

ssam_controller_lock(ctrl);

/* Set up serdev device. */
serdev_device_set_drvdata(serdev, ctrl);
serdev_device_set_client_ops(serdev, &ssam_serdev_ops);

/* The following step can fail when it's called too early before the
* underlying uart device is ready (in this case -ENXIO is returned).
* Instead of simply giving up and losing everything, we can defer
* the probing by returning -EPROBE_DEFER so that the kernel would be
* able to retry later. */
status = serdev_device_open(serdev);
if (status)
if (status == -ENXIO)
status = -EPROBE_DEFER;
if (status) {
dev_err_probe(&serdev->dev, status,
"failed to open serdev device\n");
goto err_devopen;
}

astatus = ssam_serdev_setup_via_acpi(ssh->handle, serdev);
if (ACPI_FAILURE(astatus)) {
status = -ENXIO;
dev_err(&serdev->dev, "failed to setup serdev\n");
goto err_devinit;
}

Expand All @@ -667,25 +684,33 @@ static int ssam_serial_hub_probe(struct serdev_device *serdev)
* states.
*/
status = ssam_log_firmware_version(ctrl);
if (status)
if (status) {
dev_err(&serdev->dev, "failed to get firmware version\n");
goto err_initrq;
}

status = ssam_ctrl_notif_d0_entry(ctrl);
if (status)
if (status) {
dev_err(&serdev->dev, "failed to notify EC of entry of D0\n");
goto err_initrq;
}

status = ssam_ctrl_notif_display_on(ctrl);
if (status)
if (status) {
dev_err(&serdev->dev, "failed to notify EC of display on\n");
goto err_initrq;
}

status = sysfs_create_group(&serdev->dev.kobj, &ssam_sam_group);
if (status)
goto err_initrq;

/* Set up IRQ. */
status = ssam_irq_setup(ctrl);
if (status)
if (status) {
dev_err_probe(&serdev->dev, status, "failed to setup IRQ\n");
goto err_irq;
}

/* Finally, set main controller reference. */
status = ssam_try_set_controller(ctrl);
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