linux-kernel - Re: [PATCH 2/4] gpu: host1x: Enable gather filter

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Message-ID: <64de3b3b-7c9e-54e9-49f4-d89b3d2c5f21@kapsi.fi>
Date:   Sat, 19 Aug 2017 13:46:42 +0300
From:   Mikko Perttunen <cyndis@...si.fi>
To:     Dmitry Osipenko <digetx@...il.com>,
        Mikko Perttunen <mperttunen@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com
Cc:     dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] gpu: host1x: Enable gather filter

On 08/19/2017 01:42 PM, Dmitry Osipenko wrote:
> On 18.08.2017 19:15, Mikko Perttunen wrote:
>> The gather filter is a feature present on Tegra124 and newer where the
>> hardware prevents GATHERed command buffers from executing commands
>> normally reserved for the CDMA pushbuffer which is maintained by the
>> kernel driver.
>>
>> This commit enables the gather filter on all supporting hardware.
>>
>> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
>> ---
> 
> TRM says that "Invalid Gbuffer cmd" interrupt would be raised when filtering
> happens. Is that interrupt disabled by default or it would cause 'unhandled
> interrupt'?
> 

It's disabled by default. Jobs that are stopped by the filter are then 
handled by the usual timeout mechanism.

Mikko