linux-kernel - Re: [PATCH] drm/msm: handle for EPROBE_DEFER for of_icc

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Date:   Wed, 1 Jul 2020 10:31:37 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Jonathan Marek <jonathan@...ek.ca>
Cc:     freedreno@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Brian Masney <masneyb@...tation.org>,
        Fabio Estevam <festevam@...il.com>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm: handle for EPROBE_DEFER for of_icc_get

On Wed, Jul 01, 2020 at 01:13:34PM -0400, Jonathan Marek wrote:
> On 7/1/20 1:12 PM, Matthias Kaehlcke wrote:
> > Hi Jonathan,
> > 
> > On Tue, Jun 30, 2020 at 11:08:41PM -0400, Jonathan Marek wrote:
> > > Check for EPROBE_DEFER instead of silently not using icc if the msm driver
> > > probes before the interconnect driver.
> > 
> > Agreed with supporting deferred ICC probing.
> > 
> > > Only check for EPROBE_DEFER because of_icc_get can return other errors that
> > > we want to ignore (ENODATA).
> > 
> > What would be the -ENODATA case?
> > 
> 
> The of_icc_get for the ocmem_icc_path can return -ENODATA when the ocmem
> path is not specified (it is optional and only relevant for a3xx/a4xx).

Thanks for the clarification!

In this case it seems reasonable to me to return any error for the
'gfx-mem' path and all errors except -ENODATA for 'ocmem'.