linux-kernel - Re: [PATCH v2 5/6] drm/etnaviv: Add PPU flop reset

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Message-ID: <7c8b78f040d872f7f119f849e7969a7f2a4e9c86.camel@collabora.com>
Date: Mon, 23 Jun 2025 14:05:07 +0200
From: Gert Wollny <gert.wollny@...labora.com>
To: Lucas Stach <l.stach@...gutronix.de>, Russell King
 <linux+etnaviv@...linux.org.uk>, Christian Gmeiner
 <christian.gmeiner@...il.com>
Cc: etnaviv@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 5/6] drm/etnaviv: Add PPU flop reset

On Fri, 2025-06-20 at 22:22 +0200, Lucas Stach wrote:
> 
> > @@ -1807,6 +1808,11 @@ static int etnaviv_gpu_bind(struct device
> > *dev, struct device *master,
> >  		ret = -ENXIO;
> >  		goto out_sched;
> >  	}
> > +
> > +	if (etnaviv_flop_reset_ppu_require(&gpu->identity) &&
> > +	    !priv->flop_reset_data_ppu)
> > +		etnaviv_flop_reset_ppu_init(priv);
> > +
> I don't see why you would need to do this in the bind callback. You
> should be able to move this to etnaviv_gpu_init(), so you have the
> needed identification data. gpu_init is also executed serially over
> all GPUs in the device, so there is no problem with potential races
> there.

I moved this here because you wrote before: 

> But then you should allocate this buffer
> in etnaviv_gpu_bind to avoid races between GPUs starting up and 
> trying to allocate this global memory.

If etnaviv_gpu_init() is fine, I'll move it there. 

Regards,
Gert