Re: [PATCH 2/2 v16] drm/bridge: Add I2C based driver for ps8640 bridge

[Daniel Kurtz]

Hi Emil,

One answer inline below.  The rest I leave to Jitao...

[snip...]

On Fri, Jun 17, 2016 at 3:14 AM, Emil Velikov <emil.l.velikov@xxxxxxxxx> wrote:

>> +static ssize_t ps8640_update_fw_store(struct device *dev,
>> +                                     struct device_attribute *attr,
>> +                                     const char *buf, size_t count)
>> +{
>> +       struct i2c_client *client = to_i2c_client(dev);
>> +       struct ps8640 *ps_bridge = i2c_get_clientdata(client);
>> +       const struct firmware *fw;
>> +       int error;
>> +
>> +       error = request_firmware(&fw, PS_FW_NAME, dev);
> Can the device operate without a firmware ? If not, why is the
> firmware loaded so later/after user interaction (via sysfs) ? I don't
> recall any other driver in DRM to use such an approach.

The PS8640 has internal flash, so it should always already have a
working firmware.
This sysfs interface is useful for user space initiated field firmware updates.

Regards,
-Daniel

> Regards,
> Emil
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