[PATCH 03/14] drm/atmel-hlcdc: Convert to Linux IRQ interfaces

[Dan.Sneddon at microchip.com]

Hi Thomas,

On 7/29/21 12:18 PM, Thomas Zimmermann wrote:
> Hi
> 
> Am 28.07.21 um 22:11 schrieb Sam Ravnborg:
>> Hi Dan,
>>
>>>>
>>>> I think I got it - we need to set irq_enabled to true.
>>>> The documentation says so:
>>>> "
>>>>            * @irq_enabled:
>>>>            *
>>>>            * Indicates that interrupt handling is enabled, 
>>>> specifically vblank
>>>>            * handling. Drivers which don't use drm_irq_install() 
>>>> need to set this
>>>>            * to true manually.
>>>> "
>>>>
>>>> Can you try to add the following line:
>>>>
>>>>
>>>> +static int atmel_hlcdc_dc_irq_install(struct drm_device *dev, 
>>>> unsigned int irq)
>>>> +{
>>>> +       int ret;
>>>> +
>>>> +       if (irq == IRQ_NOTCONNECTED)
>>>> +               return -ENOTCONN;
>>>> +
>>>>
>>>>           dev->irq_enabled = true;                <= THIS LINE
>>>>
>>>>
>>>> +       atmel_hlcdc_dc_irq_disable(dev);
>>>> +
>>>> +       ret = request_irq(irq, atmel_hlcdc_dc_irq_handler, 0, 
>>>> dev->driver->name, dev);
>>>> +       if (ret)
>>>> +               return ret;
>>>>
>>>> I hope this fixes it.
>>>
>>> It does!  With the irq_enabled line added everything is looking good.
> 
> Are you sure, you're testing with the latest drm-misc-next or drm-tip? 
> Because using irq_enabled is deprecated and the flag was recently 
> replaced by commit 1e4cd78ed493 ("drm: Don't test for IRQ support in 
> VBLANK ioctls").
> 
> Best regards
> Thomas
> 

I was testing with 5.14-rc3.  I can test with drm-tip or drm-misc-next. 
There a preferred branch to test from?

Thanks and regards,
Dan

>>
>> Great, thanks for testing.
>>
>> Thomas - I assume you will do a re-spin and there is likely some fixes
>> for the applied IRQ conversions too.
>>
>> Note - irq_enabled must be cleared if request_irq fails. I did not
>> include this in the testing here.
>>
>>     Sam
>>
>