linux-kernel - Re: [PATCH v2 3/3] drm/panfrost: Add initial panfrost driver

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Message-ID: <20190402003326.GB12934@rosenzweig.io>
Date:   Mon, 1 Apr 2019 17:33:26 -0700
From:   Alyssa Rosenzweig <alyssa@...enzweig.io>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Rob Herring <robh@...nel.org>, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Will Deacon <will.deacon@....com>,
        Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Lyude Paul <lyude@...hat.com>,
        Eric Anholt <eric@...olt.net>,
        Neil Armstrong <narmstrong@...libre.com>,
        "Marty E . Plummer" <hanetzer@...rtmail.com>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>
Subject: Re: [PATCH v2 3/3] drm/panfrost: Add initial panfrost driver

> the userspace definitely doesn't support T624

This is true, yes. Shouldn't be too hard to backport; if there's still
interest in Midgard 1st/2nd gen, I suppose I can grab hardware and sort
it out...

> You probably want a dma_set_mask_and_coherent() call for your 'real' output
> address size somewhere - the default 32-bit mask works out OK for RK3399,
> but on systems with RAM above 4GB io-pgtable will get very unhappy about DMA
> bounce-buffering.

Out of curiosity, are there Mali systems with >4GB RAM? That sounds
awesome :)

> Any chance of resurrecting the generic "arm,mali-midgard" compatible? :P

...Would that require editing everybody's DT file?

-----

Thank you for the review!