[PATCH v2 00/14] drm: Make DRM's IRQ helpers legacy

[Thomas Zimmermann]

Hi

Am 03.08.21 um 20:36 schrieb Chrisanthus, Anitha:
> Hi Thomas,
> Can you please hold off on applying the kmb patch, I am seeing some issues while testing. Modetest works, but video playback only plays once, and it fails the second time with this patch.

Sounds a bit like the testing issue at [1]. For testing, you need the 
latest drm-misc-next or drm-tip. Specifically, you need commit 
1e4cd78ed493 ("drm: Don't test for IRQ support in VBLANK ioctls").

Let me know whether this works for you.

Best regards
Thomas

[1] https://patchwork.freedesktop.org/patch/447057/?series=93078&rev=1

> 
> Thanks,
> Anitha
> 
> 
>> -----Original Message-----
>> From: Sam Ravnborg <sam at ravnborg.org>
>> Sent: Tuesday, August 3, 2021 8:05 AM
>> To: Thomas Zimmermann <tzimmermann at suse.de>
>> Cc: daniel at ffwll.ch; airlied at linux.ie; alexander.deucher at amd.com;
>> christian.koenig at amd.com; liviu.dudau at arm.com; brian.starkey at arm.com;
>> bbrezillon at kernel.org; nicolas.ferre at microchip.com;
>> maarten.lankhorst at linux.intel.com; mripard at kernel.org; stefan at agner.ch;
>> alison.wang at nxp.com; patrik.r.jakobsson at gmail.com; Chrisanthus, Anitha
>> <anitha.chrisanthus at intel.com>; robdclark at gmail.com; Dea, Edmund J
>> <edmund.j.dea at intel.com>; sean at poorly.run; shawnguo at kernel.org;
>> s.hauer at pengutronix.de; kernel at pengutronix.de; jyri.sarha at iki.fi;
>> tomba at kernel.org; Dan.Sneddon at microchip.com;
>> tomi.valkeinen at ideasonboard.com; amd-gfx at lists.freedesktop.org; dri-
>> devel at lists.freedesktop.org; linux-arm-kernel at lists.infradead.org; linux-arm-
>> msm at vger.kernel.org; freedreno at lists.freedesktop.org
>> Subject: Re: [PATCH v2 00/14] drm: Make DRM's IRQ helpers legacy
>>
>> Hi Thomas,
>>
>> On Tue, Aug 03, 2021 at 11:06:50AM +0200, Thomas Zimmermann wrote:
>>> DRM's IRQ helpers are only helpful for old, non-KMS drivers. Move
>>> the code behind CONFIG_DRM_LEGACY. Convert KMS drivers to Linux
>>> IRQ interfaces.
>>>
>>> DRM provides IRQ helpers for setting up, receiving and removing IRQ
>>> handlers. It's an abstraction over plain Linux functions. The code
>>> is mid-layerish with several callbacks to hook into the rsp drivers.
>>> Old UMS driver have their interrupts enabled via ioctl, so these
>>> abstractions makes some sense. Modern KMS manage all their interrupts
>>> internally. Using the DRM helpers adds indirection without benefits.
>>>
>>> Most KMS drivers already use Linux IRQ functions instead of DRM's
>>> abstraction layer. Patches 1 to 12 convert the remaining ones.
>>> The patches also resolve a bug for devices without assigned interrupt
>>> number. DRM helpers don't test for IRQ_NOTCONNECTED, so drivers do
>>> not detect if the device has no interrupt assigned.
>>>
>>> Patch 13 removes an unused function.
>>>
>>> Patch 14 moves the DRM IRQ helpers behind CONFIG_DRM_LEGACY. Only
>>> the old non-KMS drivers still use the functionality.
>>>
>>> v2:
>>> 	* drop IRQ_NOTCONNECTED test from atmel-hlcdc (Sam)
>>> 	* use devm_request_irq() in atmel-hlcdc (Sam)
>>> 	* unify variable names in arm/hlcdc (Sam)
>>>
>>> Thomas Zimmermann (14):
>>
>> The following patches are all:
>> Acked-by: Sam Ravnborg <sam at ravnborg.org>
>>
>>>    drm/fsl-dcu: Convert to Linux IRQ interfaces
>>>    drm/gma500: Convert to Linux IRQ interfaces
>>>    drm/kmb: Convert to Linux IRQ interfaces
>>>    drm/msm: Convert to Linux IRQ interfaces
>>>    drm/mxsfb: Convert to Linux IRQ interfaces
>>>    drm/tidss: Convert to Linux IRQ interfaces
>>>    drm/vc4: Convert to Linux IRQ interfaces
>>>    drm: Remove unused devm_drm_irq_install()
>>
>> The remaining patches I either skipped or already had a feedback from
>> me or I asked a question.
>>
>> 	Sam

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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