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SubjectRe: [PATCH v2 1/2] bus: mhi: host: Add sysfs entry to force device to enter EDL
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On 4/10/2024 9:15 PM, Qiang Yu wrote:
> Add sysfs entry to allow users of MHI bus force device to enter EDL.
> Considering that the way to enter EDL mode varies from device to device and
> some devices even do not support EDL. Hence, add a callback edl_trigger in
> mhi controller as part of the sysfs entry to be invoked and MHI core will
> only create EDL sysfs entry for mhi controller that provides edl_trigger
> callback. All of the process a specific device required to enter EDL mode
> can be placed in this callback.
>
> Signed-off-by: Qiang Yu <quic_qianyu@quicinc.com>
> ---
> drivers/bus/mhi/host/init.c | 35 +++++++++++++++++++++++++++++++++++
> include/linux/mhi.h | 1 +

No update to Documentation/ABI/stable/sysfs-bus-mhi ?

> 2 files changed, 36 insertions(+)
>
> diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c
> index 44f9349..333ac94 100644
> --- a/drivers/bus/mhi/host/init.c
> +++ b/drivers/bus/mhi/host/init.c
> @@ -127,6 +127,32 @@ static ssize_t soc_reset_store(struct device *dev,
> }
> static DEVICE_ATTR_WO(soc_reset);
>
> +static ssize_t force_edl_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct mhi_device *mhi_dev = to_mhi_device(dev);
> + struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl;
> + unsigned long val;
> + int ret;
> +
> + ret = kstrtoul(buf, 10, &val);
> + if (ret < 0) {
> + dev_err(dev, "Could not parse string: %d\n", ret);
> + return ret;
> + }
> +
> + if (!val)
> + return count;
> +
> + ret = mhi_cntrl->edl_trigger(mhi_cntrl);
> + if (ret)
> + return ret;
> +
> + return count;
> +}
> +static DEVICE_ATTR_WO(force_edl);
> +
> static struct attribute *mhi_dev_attrs[] = {
> &dev_attr_serial_number.attr,
> &dev_attr_oem_pk_hash.attr,
> @@ -1018,6 +1044,12 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl,
> if (ret)
> goto err_release_dev;
>
> + if (mhi_cntrl->edl_trigger) {
> + ret = sysfs_create_file(&mhi_dev->dev.kobj, &dev_attr_force_edl.attr);
> + if (ret)
> + goto err_release_dev;
> + }
> +
> mhi_cntrl->mhi_dev = mhi_dev;
>
> mhi_create_debugfs(mhi_cntrl);
> @@ -1051,6 +1083,9 @@ void mhi_unregister_controller(struct mhi_controller *mhi_cntrl)
> mhi_deinit_free_irq(mhi_cntrl);
> mhi_destroy_debugfs(mhi_cntrl);
>
> + if (mhi_cntrl->edl_trigger)
> + sysfs_remove_file(&mhi_dev->dev.kobj, &dev_attr_force_edl.attr);
> +
> destroy_workqueue(mhi_cntrl->hiprio_wq);
> kfree(mhi_cntrl->mhi_cmd);
> kfree(mhi_cntrl->mhi_event);
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index cde01e1..8db56d7 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -435,6 +435,7 @@ struct mhi_controller {
> void (*write_reg)(struct mhi_controller *mhi_cntrl, void __iomem *addr,
> u32 val);
> void (*reset)(struct mhi_controller *mhi_cntrl);
> + int (*edl_trigger)(struct mhi_controller *mhi_cntrl);

No update to the documentation for this struct?



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