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

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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.

Thanks,
Anitha


> -----Original Message-----
> From: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Sent: Tuesday, August 3, 2021 8:05 AM
> To: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Cc: daniel@xxxxxxxx; airlied@xxxxxxxx; alexander.deucher@xxxxxxx;
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> alison.wang@xxxxxxx; patrik.r.jakobsson@xxxxxxxxx; Chrisanthus, Anitha
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> 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@xxxxxxxxxxxx>
> 
> >   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




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