linux-kernel - Re: [PATCH 4/8] drm/sun4i: add support for sun8i DE2 mixers and display engines

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Message-ID: <CAL_JsqKY1sXT9g9wHhQEt9-x32PaY0yQi8++bTajcEVk1x8E_w@mail.gmail.com>
Date:   Fri, 24 Feb 2017 07:30:36 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Icenowy Zheng <icenowy@...c.xyz>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        David Airlie <airlied@...ux.ie>,
        Jean-Francois Moine <moinejf@...e.fr>,
        linux-clk <linux-clk@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 4/8] drm/sun4i: add support for sun8i DE2 mixers and
 display engines

On Wed, Feb 22, 2017 at 2:09 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> Hi,
>
> On Wed, Feb 22, 2017 at 11:23:06PM +0800, Icenowy Zheng wrote:
>> Allwinner have a new "Display Engine 2.0" in there new SoCs, which comes
>> in a new "Display Engine" (mixers instead of old backends and
>> frontends).
>>
>> Add support for the mixer on Allwinner V3s SoC; it's the simplest one.
>>
>> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
>> ---

[...]

>> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
>> new file mode 100644
>> index 000000000000..9427b57240d3
>> --- /dev/null
>> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
>> @@ -0,0 +1,417 @@
>> +/*
>> + * Copyright (C) 2017 Icenowy Zheng <icenowy@...c.xyz>
>> + *
>> + * Based on sun4i_backend.c, which is:
>> + *   Copyright (C) 2015 Free Electrons
>> + *   Copyright (C) 2015 NextThing Co
>> + *
>> + * This program is free software; you can redistribute it and/or
>> + * modify it under the terms of the GNU General Public License as
>> + * published by the Free Software Foundation; either version 2 of
>> + * the License, or (at your option) any later version.
>> + */
>> +
>> +#include <drm/drmP.h>
>> +#include <drm/drm_atomic_helper.h>
>> +#include <drm/drm_crtc.h>
>> +#include <drm/drm_crtc_helper.h>
>> +#include <drm/drm_fb_cma_helper.h>
>> +#include <drm/drm_gem_cma_helper.h>
>> +#include <drm/drm_plane_helper.h>
>> +
>> +#include <linux/component.h>
>> +#include <linux/reset.h>
>> +#include <linux/of_device.h>
>> +
>> +#include "sun8i_mixer.h"
>> +#include "sun4i_drv.h"
>> +
>> +#define SUN8I_DRAM_OFFSET 0x40000000
>
> PHYS_OFFSET?

PHYS_OFFSET is not portable. __pa(PAGE_OFFSET) instead.

If your DMA addresses are different from CPU addresses (i.e. have some
offset), then use "dma-ranges" in DT.

Rob