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From: Jernej =?utf-8?B?xaBrcmFiZWM=?= <jernej.skrabec@siol.net>
To: Icenowy Zheng <icenowy@aosc.xyz>
Cc: Rob Herring <robh+dt@kernel.org>,
        Maxime Ripard <maxime.ripard@free-electrons.com>,
        Chen-Yu Tsai <wens@csie.org>, David Airlie <airlied@linux.ie>,
        Jean-Francois Moine <moinejf@free.fr>, linux-clk@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-sunxi@googlegroups.com
Subject: Re: [PATCH 4/8] drm/sun4i: add support for sun8i DE2 mixers and display engines
Date: Wed, 22 Feb 2017 23:01:03 +0100
Message-ID: <7293775.U3DfjPVPeZ@jernej-laptop>
In-Reply-To: <20170222151854.3280-5-icenowy@aosc.xyz>
References: <20170222151854.3280-1-icenowy@aosc.xyz> <20170222151854.3280-5-icenowy@aosc.xyz>
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Hi,

Dne sreda, 22. februar 2017 ob 16:18:50 CET je Icenowy Zheng napisal(a):
> 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@aosc.xyz>
> ---
>  drivers/gpu/drm/sun4i/Kconfig       |   8 +
>  drivers/gpu/drm/sun4i/Makefile      |   1 +
>  drivers/gpu/drm/sun4i/sun4i_crtc.c  |   6 +-
>  drivers/gpu/drm/sun4i/sun4i_drv.c   |  38 +++-
>  drivers/gpu/drm/sun4i/sun4i_drv.h   |   1 +
>  drivers/gpu/drm/sun4i/sun4i_layer.c |  92 ++++++--
>  drivers/gpu/drm/sun4i/sun4i_layer.h |   1 +
>  drivers/gpu/drm/sun4i/sun8i_mixer.c | 417
> ++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/sun4i/sun8i_mixer.h |
> 133 ++++++++++++
>  9 files changed, 674 insertions(+), 23 deletions(-)
>  create mode 100644 drivers/gpu/drm/sun4i/sun8i_mixer.c
>  create mode 100644 drivers/gpu/drm/sun4i/sun8i_mixer.h
> 
> diff --git a/drivers/gpu/drm/sun4i/Kconfig b/drivers/gpu/drm/sun4i/Kconfig
> index a4b357db8856..8df401fff145 100644
> --- a/drivers/gpu/drm/sun4i/Kconfig
> +++ b/drivers/gpu/drm/sun4i/Kconfig
> @@ -12,3 +12,11 @@ config DRM_SUN4I
>  	  Choose this option if you have an Allwinner SoC with a
>  	  Display Engine. If M is selected the module will be called
>  	  sun4i-drm.
> +
> +config DRM_SUN4I_DE2
> +	bool "Support Display Engine 2.0"
> +	depends on DRM_SUN4I
> +	default MACH_SUN8I
> +	help
> +	  Choose this option if you have an Allwinner SoC with a
> +	  "Display Engine 2.0".
> diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
> index d625a82a6e5f..890e6e50dfee 100644
> --- a/drivers/gpu/drm/sun4i/Makefile
> +++ b/drivers/gpu/drm/sun4i/Makefile
> @@ -9,5 +9,6 @@ sun4i-tcon-y += sun4i_dotclock.o
> 
>  obj-$(CONFIG_DRM_SUN4I)		+= sun4i-drm.o sun4i-tcon.o
>  obj-$(CONFIG_DRM_SUN4I)		+= sun4i_backend.o
> +obj-$(CONFIG_DRM_SUN4I)		+= sun8i_mixer.o
>  obj-$(CONFIG_DRM_SUN4I)		+= sun6i_drc.o
>  obj-$(CONFIG_DRM_SUN4I)		+= sun4i_tv.o
> diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.c
> b/drivers/gpu/drm/sun4i/sun4i_crtc.c index 4a192210574f..4d2228454726
> 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
> @@ -25,6 +25,7 @@
>  #include <video/videomode.h>
> 
>  #include "sun4i_backend.h"
> +#include "sun8i_mixer.h"
>  #include "sun4i_crtc.h"
>  #include "sun4i_drv.h"
>  #include "sun4i_tcon.h"
> @@ -55,7 +56,10 @@ static void sun4i_crtc_atomic_flush(struct drm_crtc
> *crtc,
> 
>  	DRM_DEBUG_DRIVER("Committing plane changes\n");
> 
> -	sun4i_backend_commit(drv->backend);
> +	if (drv->backend)
> +		sun4i_backend_commit(drv->backend);
> +	else if (drv->mixer)
> +		sun8i_mixer_commit(drv->mixer);

Does it make sense to have everything in sun4i_{crtc,drv} files? Looking 
further it seems that there is a lot of differentiation based on DE1 vs DE2. I 
guess having separate sun8i_{crtc,drv} files would be more clean approach. It 
would enable easier extensions later as well.

Regards,
Jernej Skrabec

> 
>  	if (event) {
>  		crtc->state->event = NULL;
> diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c
> b/drivers/gpu/drm/sun4i/sun4i_drv.c index 4ce665349f6b..58af38f5e833 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_drv.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
> @@ -20,12 +20,17 @@
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_of.h>
> 
> +#include <linux/of_device.h>
> +
>  #include "sun4i_crtc.h"
>  #include "sun4i_drv.h"
>  #include "sun4i_framebuffer.h"
>  #include "sun4i_layer.h"
>  #include "sun4i_tcon.h"
> 
> +#define DE_VER_DE	0
> +#define DE_VER_DE2	1
> +
>  static int sun4i_drv_enable_vblank(struct drm_device *drm, unsigned int
> pipe) {
>  	struct sun4i_drv *drv = drm->dev_private;
> @@ -117,7 +122,9 @@ static int sun4i_drv_bind(struct device *dev)
>  {
>  	struct drm_device *drm;
>  	struct sun4i_drv *drv;
> -	int ret;
> +	int ret, de_ver;
> +
> +	de_ver = (int)of_device_get_match_data(dev);
> 
>  	drm = drm_dev_alloc(&sun4i_drv_driver, dev);
>  	if (IS_ERR(drm))
> @@ -140,7 +147,10 @@ static int sun4i_drv_bind(struct device *dev)
>  	}
> 
>  	/* Create our layers */
> -	drv->layers = sun4i_layers_init(drm);
> +	if (de_ver == DE_VER_DE2)
> +		drv->layers = sun8i_layers_init(drm);
> +	else
> +		drv->layers = sun4i_layers_init(drm);
>  	if (IS_ERR(drv->layers)) {
>  		dev_err(drm->dev, "Couldn't create the planes\n");
>  		ret = PTR_ERR(drv->layers);
> @@ -323,10 +333,26 @@ static int sun4i_drv_remove(struct platform_device
> *pdev) }
> 
>  static const struct of_device_id sun4i_drv_of_table[] = {
> -	{ .compatible = "allwinner,sun5i-a13-display-engine" },
> -	{ .compatible = "allwinner,sun6i-a31-display-engine" },
> -	{ .compatible = "allwinner,sun6i-a31s-display-engine" },
> -	{ .compatible = "allwinner,sun8i-a33-display-engine" },
> +	{
> +		.compatible = "allwinner,sun5i-a13-display-engine",
> +		.data = (void *)DE_VER_DE,
> +	},
> +	{
> +		.compatible = "allwinner,sun6i-a31-display-engine",
> +		.data = (void *)DE_VER_DE,
> +	},
> +	{
> +		.compatible = "allwinner,sun6i-a31s-display-engine",
> +		.data = (void *)DE_VER_DE,
> +	},
> +	{
> +		.compatible = "allwinner,sun8i-a33-display-engine",
> +		.data = (void *)DE_VER_DE,
> +	},
> +	{
> +		.compatible = "allwinner,sun8i-v3s-display-engine",
> +		.data = (void *)DE_VER_DE2,
> +	},
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
> diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.h
> b/drivers/gpu/drm/sun4i/sun4i_drv.h index 597353eab728..cf1da95b85bd 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_drv.h
> +++ b/drivers/gpu/drm/sun4i/sun4i_drv.h
> @@ -18,6 +18,7 @@
> 
>  struct sun4i_drv {
>  	struct sun4i_backend	*backend;
> +	struct sun8i_mixer	*mixer;
>  	struct sun4i_crtc	*crtc;
>  	struct sun4i_tcon	*tcon;
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c
> b/drivers/gpu/drm/sun4i/sun4i_layer.c index 5d53c977bca5..6dcdac38ab69
> 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_layer.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
> @@ -16,52 +16,66 @@
>  #include <drm/drmP.h>
> 
>  #include "sun4i_backend.h"
> +#include "sun8i_mixer.h"
>  #include "sun4i_drv.h"
>  #include "sun4i_layer.h"
> 
>  struct sun4i_plane_desc {
>  	       enum drm_plane_type     type;
> +	       /* Pipe is not used in sun8i-mixer */
>  	       u8                      pipe;
>  	       const uint32_t          *formats;
>  	       uint32_t                nformats;
>  };
> 
> -static int sun4i_backend_layer_atomic_check(struct drm_plane *plane,
> +static int sun4i_layer_atomic_check(struct drm_plane *plane,
>  					    struct drm_plane_state *state)
>  {
>  	return 0;
>  }
> 
> -static void sun4i_backend_layer_atomic_disable(struct drm_plane *plane,
> +static void sun4i_layer_atomic_disable(struct drm_plane *plane,
>  					       struct drm_plane_state *old_state)
>  {
>  	struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
>  	struct sun4i_drv *drv = layer->drv;
>  	struct sun4i_backend *backend = drv->backend;
> +	struct sun8i_mixer *mixer = drv->mixer;
> 
> -	sun4i_backend_layer_enable(backend, layer->id, false);
> +	if (backend)
> +		sun4i_backend_layer_enable(backend, layer->id, false);
> +	else if (mixer)
> +		sun8i_mixer_layer_enable(mixer, layer->id, false);
>  }
> 
> -static void sun4i_backend_layer_atomic_update(struct drm_plane *plane,
> +static void sun4i_layer_atomic_update(struct drm_plane *plane,
>  					      struct drm_plane_state *old_state)
>  {
>  	struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
>  	struct sun4i_drv *drv = layer->drv;
>  	struct sun4i_backend *backend = drv->backend;
> -
> -	sun4i_backend_update_layer_coord(backend, layer->id, plane);
> -	sun4i_backend_update_layer_formats(backend, layer->id, plane);
> -	sun4i_backend_update_layer_buffer(backend, layer->id, plane);
> -	sun4i_backend_layer_enable(backend, layer->id, true);
> +	struct sun8i_mixer *mixer = drv->mixer;
> +
> +	if (backend) {
> +		sun4i_backend_update_layer_coord(backend, layer->id, plane);
> +		sun4i_backend_update_layer_formats(backend, layer->id, plane);
> +		sun4i_backend_update_layer_buffer(backend, layer->id, plane);
> +		sun4i_backend_layer_enable(backend, layer->id, true);
> +	} else if (mixer) {
> +		sun8i_mixer_update_layer_coord(mixer, layer->id, plane);
> +		sun8i_mixer_update_layer_formats(mixer, layer->id, plane);
> +		sun8i_mixer_update_layer_buffer(mixer, layer->id, plane);
> +		sun8i_mixer_layer_enable(mixer, layer->id, true);
> +	}
>  }
> 
> -static struct drm_plane_helper_funcs sun4i_backend_layer_helper_funcs = {
> -	.atomic_check	= sun4i_backend_layer_atomic_check,
> -	.atomic_disable	= sun4i_backend_layer_atomic_disable,
> -	.atomic_update	= sun4i_backend_layer_atomic_update,
> +static struct drm_plane_helper_funcs sun4i_layer_helper_funcs = {
> +	.atomic_check	= sun4i_layer_atomic_check,
> +	.atomic_disable	= sun4i_layer_atomic_disable,
> +	.atomic_update	= sun4i_layer_atomic_update,
>  };
> 
> -static const struct drm_plane_funcs sun4i_backend_layer_funcs = {
> +static const struct drm_plane_funcs sun4i_layer_funcs = {
>  	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
>  	.atomic_duplicate_state	= drm_atomic_helper_plane_duplicate_state,
>  	.destroy		= drm_plane_cleanup,
> @@ -88,6 +102,12 @@ static const uint32_t
> sun4i_backend_layer_formats_overlay[] = { DRM_FORMAT_XRGB8888,
>  };
> 
> +static const uint32_t sun8i_mixer_layer_formats[] = {
> +	DRM_FORMAT_ARGB8888,
> +	DRM_FORMAT_RGB888,
> +	DRM_FORMAT_XRGB8888,
> +};
> +
>  static const struct sun4i_plane_desc sun4i_backend_planes[] = {
>  	{
>  		.type = DRM_PLANE_TYPE_PRIMARY,
> @@ -103,6 +123,19 @@ static const struct sun4i_plane_desc
> sun4i_backend_planes[] = { },
>  };
> 
> +static const struct sun4i_plane_desc sun8i_mixer_planes[] = {
> +	{
> +		.type = DRM_PLANE_TYPE_PRIMARY,
> +		.formats = sun8i_mixer_layer_formats,
> +		.nformats = ARRAY_SIZE(sun8i_mixer_layer_formats),
> +	},
> +	{
> +		.type = DRM_PLANE_TYPE_OVERLAY,
> +		.formats = sun8i_mixer_layer_formats,
> +		.nformats = ARRAY_SIZE(sun8i_mixer_layer_formats),
> +	},
> +};
> +
>  static struct sun4i_layer *sun4i_layer_init_one(struct drm_device *drm,
>  						const struct sun4i_plane_desc *plane)
>  {
> @@ -115,7 +148,7 @@ static struct sun4i_layer *sun4i_layer_init_one(struct
> drm_device *drm, return ERR_PTR(-ENOMEM);
> 
>  	ret = drm_universal_plane_init(drm, &layer->plane, BIT(0),
> -				       &sun4i_backend_layer_funcs,
> +				       &sun4i_layer_funcs,
>  				       plane->formats, plane->nformats,
>  				       plane->type, NULL);
>  	if (ret) {
> @@ -124,7 +157,7 @@ static struct sun4i_layer *sun4i_layer_init_one(struct
> drm_device *drm, }
> 
>  	drm_plane_helper_add(&layer->plane,
> -			     &sun4i_backend_layer_helper_funcs);
> +			     &sun4i_layer_helper_funcs);
>  	layer->drv = drv;
> 
>  	if (plane->type == DRM_PLANE_TYPE_PRIMARY)
> @@ -187,3 +220,30 @@ struct sun4i_layer **sun4i_layers_init(struct
> drm_device *drm)
> 
>  	return layers;
>  }
> +
> +struct sun4i_layer **sun8i_layers_init(struct drm_device *drm)
> +{
> +	struct sun4i_layer **layers;
> +	int i;
> +
> +	layers = devm_kcalloc(drm->dev, ARRAY_SIZE(sun8i_mixer_planes),
> +			      sizeof(**layers), GFP_KERNEL);
> +	if (!layers)
> +		return ERR_PTR(-ENOMEM);
> +
> +	for (i = 0; i < ARRAY_SIZE(sun8i_mixer_planes); i++) {
> +		const struct sun4i_plane_desc *plane = &sun8i_mixer_planes[i];
> +		struct sun4i_layer *layer = layers[i];
> +
> +		layer = sun4i_layer_init_one(drm, plane);
> +		if (IS_ERR(layer)) {
> +			dev_err(drm->dev, "Couldn't initialize %s plane\n",
> +				i ? "overlay" : "primary");
> +			return ERR_CAST(layer);
> +		};
> +
> +		layer->id = i;
> +	};
> +
> +	return layers;
> +}
> diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.h
> b/drivers/gpu/drm/sun4i/sun4i_layer.h index a2f65d7a3f4e..f7b9e5daea50
> 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_layer.h
> +++ b/drivers/gpu/drm/sun4i/sun4i_layer.h
> @@ -26,5 +26,6 @@ plane_to_sun4i_layer(struct drm_plane *plane)
>  }
> 
>  struct sun4i_layer **sun4i_layers_init(struct drm_device *drm);
> +struct sun4i_layer **sun8i_layers_init(struct drm_device *drm);
> 
>  #endif /* _SUN4I_LAYER_H_ */
> 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@aosc.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
> +
> +#if defined CONFIG_DRM_SUN4I_DE2
> +void sun8i_mixer_commit(struct sun8i_mixer *mixer)
> +{
> +	DRM_DEBUG_DRIVER("Committing changes\n");
> +
> +	regmap_write(mixer->regs, SUN8I_MIXER_GLOBAL_DBUFF,
> +		     SUN8I_MIXER_GLOBAL_DBUFF_ENABLE);
> +}
> +EXPORT_SYMBOL(sun8i_mixer_commit);
> +
> +void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
> +				int layer, bool enable)
> +{
> +	u32 val;
> +	/* Currently the first UI channel is used */
> +	int chan = mixer->cfg->vi_num;
> +
> +	DRM_DEBUG_DRIVER("Enabling layer %d in channel %d\n", layer, chan);
> +
> +	if (enable)
> +		val = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN;
> +	else
> +		val = 0;
> +
> +	regmap_update_bits(mixer->regs,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN, val);
> +
> +	/* Set the alpha configuration */
> +	regmap_update_bits(mixer->regs,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_MASK,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_DEF);
> +	regmap_update_bits(mixer->regs,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MASK,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_DEF);
> +}
> +EXPORT_SYMBOL(sun8i_mixer_layer_enable);
> +
> +static int sun8i_mixer_drm_format_to_layer(struct drm_plane *plane,
> +					     u32 format, u32 *mode)
> +{
> +	if ((plane->type == DRM_PLANE_TYPE_PRIMARY) &&
> +	    (format == DRM_FORMAT_ARGB8888))
> +		format = DRM_FORMAT_XRGB8888;
> +
> +	switch (format) {
> +	case DRM_FORMAT_ARGB8888:
> +		*mode = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_ARGB8888;
> +		break;
> +
> +	case DRM_FORMAT_XRGB8888:
> +		*mode = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_XRGB8888;
> +		break;
> +
> +	case DRM_FORMAT_RGB888:
> +		*mode = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_RGB888;
> +		break;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +int sun8i_mixer_update_layer_coord(struct sun8i_mixer *mixer,
> +				     int layer, struct drm_plane *plane)
> +{
> +	struct drm_plane_state *state = plane->state;
> +	struct drm_framebuffer *fb = state->fb;
> +	/* Currently the first UI channel is used */
> +	int chan = mixer->cfg->vi_num;
> +	int i;
> +
> +	DRM_DEBUG_DRIVER("Updating layer %d\n", layer);
> +
> +	if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
> +		DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H: %u\n",
> +				 state->crtc_w, state->crtc_h);
> +		regmap_write(mixer->regs, SUN8I_MIXER_GLOBAL_SIZE,
> +			     SUN8I_MIXER_SIZE(state->crtc_w,
> +					      state->crtc_h));
> +		DRM_DEBUG_DRIVER("Updating blender size\n");
> +		for (i = 0; i < SUN8I_MIXER_MAX_CHAN_COUNT; i++)
> +			regmap_write(mixer->regs,
> +				     SUN8I_MIXER_BLEND_ATTR_INSIZE(i),
> +				     SUN8I_MIXER_SIZE(state->crtc_w,
> +						      state->crtc_h));
> +		regmap_write(mixer->regs, SUN8I_MIXER_BLEND_OUTSIZE,
> +			     SUN8I_MIXER_SIZE(state->crtc_w,
> +					      state->crtc_h));
> +		DRM_DEBUG_DRIVER("Updating channel size\n");
> +		regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_OVL_SIZE(chan),
> +			     SUN8I_MIXER_SIZE(state->crtc_w,
> +					      state->crtc_h));
> +	}
> +
> +	/* Set the line width */
> +	DRM_DEBUG_DRIVER("Layer line width: %d bytes\n", fb->pitches[0]);
> +	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_PITCH(chan, layer),
> +		     fb->pitches[0]);
> +
> +	/* Set height and width */
> +	DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n",
> +			 state->crtc_w, state->crtc_h);
> +	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_SIZE(chan, layer),
> +		     SUN8I_MIXER_SIZE(state->crtc_w, state->crtc_h));
> +
> +	/* Set base coordinates */
> +	DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
> +			 state->crtc_x, state->crtc_y);
> +	regmap_write(mixer->regs, SUN8I_MIXER_CHAN_UI_LAYER_COORD(chan, layer),
> +		     SUN8I_MIXER_COORD(state->crtc_x, state->crtc_y));
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(sun8i_mixer_update_layer_coord);
> +
> +int sun8i_mixer_update_layer_formats(struct sun8i_mixer *mixer,
> +				       int layer, struct drm_plane *plane)
> +{
> +	struct drm_plane_state *state = plane->state;
> +	struct drm_framebuffer *fb = state->fb;
> +	bool interlaced = false;
> +	u32 val;
> +	/* Currently the first UI channel is used */
> +	int chan = mixer->cfg->vi_num;
> +	int ret;
> +
> +	if (plane->state->crtc)
> +		interlaced = plane->state->crtc->state->adjusted_mode.flags
> +			& DRM_MODE_FLAG_INTERLACE;
> +
> +	regmap_update_bits(mixer->regs, SUN8I_MIXER_BLEND_OUTCTL,
> +			   SUN8I_MIXER_BLEND_OUTCTL_INTERLACED,
> +			   interlaced ?
> +			   SUN8I_MIXER_BLEND_OUTCTL_INTERLACED : 0);
> +
> +	DRM_DEBUG_DRIVER("Switching display mixer interlaced mode %s\n",
> +			 interlaced ? "on" : "off");
> +
> +	ret = sun8i_mixer_drm_format_to_layer(plane, fb->format->format,
> +						&val);
> +	if (ret) {
> +		DRM_DEBUG_DRIVER("Invalid format\n");
> +		return ret;
> +	}
> +
> +	regmap_update_bits(mixer->regs,
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
> +			   SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_MASK, val);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(sun8i_mixer_update_layer_formats);
> +
> +int sun8i_mixer_update_layer_buffer(struct sun8i_mixer *mixer,
> +				      int layer, struct drm_plane *plane)
> +{
> +	struct drm_plane_state *state = plane->state;
> +	struct drm_framebuffer *fb = state->fb;
> +	struct drm_gem_cma_object *gem;
> +	dma_addr_t paddr;
> +	uint32_t paddr_u32;
> +	/* Currently the first UI channel is used */
> +	int chan = mixer->cfg->vi_num;
> +	int bpp;
> +
> +	/* Get the physical address of the buffer in memory */
> +	gem = drm_fb_cma_get_gem_obj(fb, 0);
> +
> +	DRM_DEBUG_DRIVER("Using GEM @ %pad\n", &gem->paddr);
> +
> +	/* Compute the start of the displayed memory */
> +	bpp = fb->format->cpp[0];
> +	paddr = gem->paddr + fb->offsets[0];
> +	paddr += (state->src_x >> 16) * bpp;
> +	paddr += (state->src_y >> 16) * fb->pitches[0];
> +	paddr -= SUN8I_DRAM_OFFSET;
> +
> +	DRM_DEBUG_DRIVER("Setting buffer address to %pad\n", &paddr);
> +
> +	paddr_u32 = (uint32_t) paddr;
> +
> +	regmap_write(mixer->regs,
> +		     SUN8I_MIXER_CHAN_UI_LAYER_TOP_LADDR(chan, layer),
> +		     paddr_u32);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(sun8i_mixer_update_layer_buffer);
> +
> +static struct regmap_config sun8i_mixer_regmap_config = {
> +	.reg_bits	= 32,
> +	.val_bits	= 32,
> +	.reg_stride	= 4,
> +	.max_register	= 0xbffc, /* guessed */
> +};
> +
> +static int sun8i_mixer_bind(struct device *dev, struct device *master,
> +			      void *data)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct drm_device *drm = data;
> +	struct sun4i_drv *drv = drm->dev_private;
> +	struct sun8i_mixer *mixer;
> +	struct resource *res;
> +	void __iomem *regs;
> +	int i, ret;
> +
> +	mixer = devm_kzalloc(dev, sizeof(*mixer), GFP_KERNEL);
> +	if (!mixer)
> +		return -ENOMEM;
> +	dev_set_drvdata(dev, mixer);
> +	drv->mixer = mixer;
> +
> +	mixer->cfg = of_device_get_match_data(dev);
> +	if (!mixer->cfg)
> +		return -EINVAL;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	regs = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(regs))
> +		return PTR_ERR(regs);
> +
> +	mixer->regs = devm_regmap_init_mmio(dev, regs,
> +					      &sun8i_mixer_regmap_config);
> +	if (IS_ERR(mixer->regs)) {
> +		dev_err(dev, "Couldn't create the mixer regmap\n");
> +		return PTR_ERR(mixer->regs);
> +	}
> +
> +	mixer->reset = devm_reset_control_get(dev, NULL);
> +	if (IS_ERR(mixer->reset)) {
> +		dev_err(dev, "Couldn't get our reset line\n");
> +		return PTR_ERR(mixer->reset);
> +	}
> +
> +	ret = reset_control_deassert(mixer->reset);
> +	if (ret) {
> +		dev_err(dev, "Couldn't deassert our reset line\n");
> +		return ret;
> +	}
> +
> +	mixer->bus_clk = devm_clk_get(dev, "bus");
> +	if (IS_ERR(mixer->bus_clk)) {
> +		dev_err(dev, "Couldn't get the mixer bus clock\n");
> +		ret = PTR_ERR(mixer->bus_clk);
> +		goto err_assert_reset;
> +	}
> +	clk_prepare_enable(mixer->bus_clk);
> +
> +	mixer->mod_clk = devm_clk_get(dev, "mod");
> +	if (IS_ERR(mixer->mod_clk)) {
> +		dev_err(dev, "Couldn't get the mixer module clock\n");
> +		ret = PTR_ERR(mixer->mod_clk);
> +		goto err_disable_bus_clk;
> +	}
> +	clk_prepare_enable(mixer->mod_clk);
> +
> +	/* Reset the registers */
> +	for (i = 0x0; i < 0x20000; i += 4)
> +		regmap_write(mixer->regs, i, 0);
> +
> +	/* Enable the mixer */
> +	regmap_write(mixer->regs, SUN8I_MIXER_GLOBAL_CTL,
> +		     SUN8I_MIXER_GLOBAL_CTL_RT_EN);
> +
> +	/* Initialize blender */
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_FCOLOR_CTL,
> +		     SUN8I_MIXER_BLEND_FCOLOR_CTL_DEF);
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_PREMULTIPLY,
> +		     SUN8I_MIXER_BLEND_PREMULTIPLY_DEF);
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_BKCOLOR,
> +		     SUN8I_MIXER_BLEND_BKCOLOR_DEF);
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_MODE(0),
> +		     SUN8I_MIXER_BLEND_MODE_DEF);
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_MODE(1),
> +		     SUN8I_MIXER_BLEND_MODE_DEF);
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_CK_CTL,
> +		     SUN8I_MIXER_BLEND_CK_CTL_DEF);
> +
> +	for (i = 0; i < SUN8I_MIXER_MAX_CHAN_COUNT; i++)
> +		regmap_write(mixer->regs,
> +			     SUN8I_MIXER_BLEND_ATTR_FCOLOR(i),
> +			     SUN8I_MIXER_BLEND_ATTR_FCOLOR_DEF);
> +
> +	/* Select the first UI channel */
> +	DRM_DEBUG_DRIVER("Selecting channel %d (first UI channel)\n",
> +			 mixer->cfg->vi_num);
> +	regmap_write(mixer->regs, SUN8I_MIXER_BLEND_ROUTE,
> +		     mixer->cfg->vi_num);
> +
> +	return 0;
> +
> +	clk_disable_unprepare(mixer->mod_clk);
> +err_disable_bus_clk:
> +	clk_disable_unprepare(mixer->bus_clk);
> +err_assert_reset:
> +	reset_control_assert(mixer->reset);
> +	return ret;
> +}
> +
> +static void sun8i_mixer_unbind(struct device *dev, struct device *master,
> +				 void *data)
> +{
> +	struct sun8i_mixer *mixer = dev_get_drvdata(dev);
> +
> +	clk_disable_unprepare(mixer->mod_clk);
> +	clk_disable_unprepare(mixer->bus_clk);
> +	reset_control_assert(mixer->reset);
> +}
> +
> +static const struct component_ops sun8i_mixer_ops = {
> +	.bind	= sun8i_mixer_bind,
> +	.unbind	= sun8i_mixer_unbind,
> +};
> +
> +static int sun8i_mixer_probe(struct platform_device *pdev)
> +{
> +	return component_add(&pdev->dev, &sun8i_mixer_ops);
> +}
> +
> +static int sun8i_mixer_remove(struct platform_device *pdev)
> +{
> +	component_del(&pdev->dev, &sun8i_mixer_ops);
> +
> +	return 0;
> +}
> +
> +static const struct sun8i_mixer_cfg sun8i_v3s_mixer_cfg = {
> +	.vi_num = 2,
> +	.ui_num = 1,
> +};
> +
> +static const struct of_device_id sun8i_mixer_of_table[] = {
> +	{
> +		.compatible = "allwinner,sun8i-v3s-de2-mixer",
> +		.data = &sun8i_v3s_mixer_cfg
> +	},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, sun8i_mixer_of_table);
> +
> +static struct platform_driver sun8i_mixer_platform_driver = {
> +	.probe		= sun8i_mixer_probe,
> +	.remove		= sun8i_mixer_remove,
> +	.driver		= {
> +		.name		= "sun8i-mixer",
> +		.of_match_table	= sun8i_mixer_of_table,
> +	},
> +};
> +module_platform_driver(sun8i_mixer_platform_driver);
> +
> +MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.xyz>");
> +MODULE_DESCRIPTION("Allwinner DE2 Mixer driver");
> +MODULE_LICENSE("GPL");
> +#else /* DRM_SUN4I_DE2 */
> +void sun8i_mixer_commit(struct sun8i_mixer *mixer)
> +{
> +}
> +
> +void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
> +				int layer, bool enable)
> +{
> +}
> +
> +int sun8i_mixer_update_layer_coord(struct sun8i_mixer *mixer,
> +				     int layer, struct drm_plane *plane)
> +{
> +	return -ENOENT;
> +}
> +
> +int sun8i_mixer_update_layer_formats(struct sun8i_mixer *mixer,
> +				       int layer, struct drm_plane *plane)
> +{
> +	return -ENOENT;
> +}
> +
> +int sun8i_mixer_update_layer_buffer(struct sun8i_mixer *mixer,
> +				      int layer, struct drm_plane *plane)
> +{
> +	return -ENOENT;
> +}
> +#endif /* CONFIG_DRM_SUN4I_DE2 */
> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h
> b/drivers/gpu/drm/sun4i/sun8i_mixer.h new file mode 100644
> index 000000000000..0bc134b3bc98
> --- /dev/null
> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
> @@ -0,0 +1,133 @@
> +/*
> + * Copyright (C) 2017 Icenowy Zheng <icenowy@aosc.xyz>
> + *
> + * 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.
> + */
> +
> +#ifndef _SUN8I_MIXER_H_
> +#define _SUN8I_MIXER_H_
> +
> +#include <linux/clk.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +
> +#include "sun4i_layer.h"
> +
> +#define SUN8I_MIXER_MAX_CHAN_COUNT		4
> +
> +#define SUN8I_MIXER_SIZE(w, h)			(((h) - 1) << 16 | ((w) - 1))
> +#define SUN8I_MIXER_COORD(x, y)			((y) << 16 | (x))
> +
> +#define SUN8I_MIXER_GLOBAL_CTL			0x0
> +#define SUN8I_MIXER_GLOBAL_STATUS		0x4
> +#define SUN8I_MIXER_GLOBAL_DBUFF		0x8
> +#define SUN8I_MIXER_GLOBAL_SIZE			0xc
> +
> +#define SUN8I_MIXER_GLOBAL_CTL_RT_EN		0x1
> +
> +#define SUN8I_MIXER_GLOBAL_DBUFF_ENABLE		0x1
> +
> +#define SUN8I_MIXER_BLEND_FCOLOR_CTL		0x1000
> +#define SUN8I_MIXER_BLEND_ATTR_FCOLOR(x)	(0x1004 + 0x10 * (x) + 0x0)
> +#define SUN8I_MIXER_BLEND_ATTR_INSIZE(x)	(0x1004 + 0x10 * (x) + 0x4)
> +#define SUN8I_MIXER_BLEND_ATTR_OFFSET(x)	(0x1004 + 0x10 * (x) + 0x8)
> +#define SUN8I_MIXER_BLEND_ROUTE			0x1080
> +#define SUN8I_MIXER_BLEND_PREMULTIPLY		0x1084
> +#define SUN8I_MIXER_BLEND_BKCOLOR		0x1088
> +#define SUN8I_MIXER_BLEND_OUTSIZE		0x108c
> +#define SUN8I_MIXER_BLEND_MODE(x)		(0x1090 + 0x04 * (x))
> +#define SUN8I_MIXER_BLEND_CK_CTL		0x10b0
> +#define SUN8I_MIXER_BLEND_CK_CFG		0x10b4
> +#define SUN8I_MIXER_BLEND_CK_MAX(x)		(0x10c0 + 0x04 * (x))
> +#define SUN8I_MIXER_BLEND_CK_MIN(x)		(0x10e0 + 0x04 * (x))
> +#define SUN8I_MIXER_BLEND_OUTCTL		0x10fc
> +
> +/* The following numbers are some still unknown magic numbers */
> +#define SUN8I_MIXER_BLEND_ATTR_FCOLOR_DEF	0xff000000
> +#define SUN8I_MIXER_BLEND_FCOLOR_CTL_DEF	0x00000101
> +#define SUN8I_MIXER_BLEND_PREMULTIPLY_DEF	0x0
> +#define SUN8I_MIXER_BLEND_BKCOLOR_DEF		0xff000000
> +#define SUN8I_MIXER_BLEND_MODE_DEF		0x03010301
> +#define SUN8I_MIXER_BLEND_CK_CTL_DEF		0x0
> +
> +#define SUN8I_MIXER_BLEND_OUTCTL_INTERLACED	BIT(1)
> +
> +/*
> + * VI channels are not used now, but the support of them may be introduced
> in + * the future.
> + */
> +
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x0)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_SIZE(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x4)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_COORD(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x8)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_PITCH(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0xc)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_TOP_LADDR(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x10)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_BOT_LADDR(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x14)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_FCOLOR(ch, layer) \
> +			(0x2000 + 0x1000 * (ch) + 0x20 * (layer) + 0x18)
> +#define SUN8I_MIXER_CHAN_UI_TOP_HADDR(ch)	(0x2000 + 0x1000 * (ch) + 0x80)
> +#define SUN8I_MIXER_CHAN_UI_BOT_HADDR(ch)	(0x2000 + 0x1000 * (ch) + 0x84)
> +#define SUN8I_MIXER_CHAN_UI_OVL_SIZE(ch)	(0x2000 + 0x1000 * (ch) + 0x88)
> +
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN		BIT(0)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_MASK	GENMASK(2, 1)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_MASK	GENMASK(11, 8)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MASK	GENMASK(31, 24)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_DEF	(1 << 1)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_ARGB8888	(0 << 8)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_XRGB8888	(4 << 8)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_FBFMT_RGB888	(8 << 8)
> +#define SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_DEF	(0xff << 24)
> +
> +/*
> + * These sun-engines are still unknown now, the EN registers are here only
> to + * be used to disable these sub-engines.
> + */
> +#define SUN8I_MIXER_VSU_EN			0x20000
> +#define SUN8I_MIXER_GSU1_EN			0x30000
> +#define SUN8I_MIXER_GSU2_EN			0x40000
> +#define SUN8I_MIXER_GSU3_EN			0x50000
> +#define SUN8I_MIXER_FCE_EN			0xa0000
> +#define SUN8I_MIXER_BWS_EN			0xa2000
> +#define SUN8I_MIXER_LTI_EN			0xa4000
> +#define SUN8I_MIXER_PEAK_EN			0xa6000
> +#define SUN8I_MIXER_ASE_EN			0xa8000
> +#define SUN8I_MIXER_FCC_EN			0xaa000
> +#define SUN8I_MIXER_DCSC_EN			0xb0000
> +
> +struct sun8i_mixer_cfg {
> +	int		vi_num;
> +	int		ui_num;
> +};
> +
> +struct sun8i_mixer {
> +	struct regmap			*regs;
> +
> +	const struct sun8i_mixer_cfg	*cfg;
> +
> +	struct reset_control		*reset;
> +
> +	struct clk			*bus_clk;
> +	struct clk			*mod_clk;
> +};
> +
> +void sun8i_mixer_commit(struct sun8i_mixer *mixer);
> +
> +void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
> +				int layer, bool enable);
> +int sun8i_mixer_update_layer_coord(struct sun8i_mixer *mixer,
> +				     int layer, struct drm_plane *plane);
> +int sun8i_mixer_update_layer_formats(struct sun8i_mixer *mixer,
> +				       int layer, struct drm_plane *plane);
> +int sun8i_mixer_update_layer_buffer(struct sun8i_mixer *mixer,
> +				      int layer, struct drm_plane *plane);
> +#endif /* _SUN8I_MIXER_H_ */
> --
> 2.11.1