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Message-ID: <CAGb2v65e2a_f+UEDu-Wk3bWvgHt24erjk+iLWgMAQwB-mzcnaA@mail.gmail.com>
Date: Thu, 25 Dec 2025 17:37:06 +0800
From: Chen-Yu Tsai <wens@...nel.org>
To: Jernej Skrabec <jernej.skrabec@...il.com>
Cc: samuel@...lland.org, mripard@...nel.org, maarten.lankhorst@...ux.intel.com,
tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch, robh@...nel.org,
krzk+dt@...nel.org, conor+dt@...nel.org, mturquette@...libre.com,
sboyd@...nel.org, dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH 5/7] drm/sun4i: Add planes driver
On Thu, Dec 25, 2025 at 5:29 PM Chen-Yu Tsai <wens@...nel.org> wrote:
>
> On Sat, Nov 15, 2025 at 10:14 PM Jernej Skrabec
> <jernej.skrabec@...il.com> wrote:
> >
> > This driver serves just as planes sharing manager, needed for Display
> > Engine 3.3 and newer.
> >
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
> > ---
> > drivers/gpu/drm/sun4i/Kconfig | 8 +
> > drivers/gpu/drm/sun4i/Makefile | 1 +
> > drivers/gpu/drm/sun4i/sun50i_planes.c | 205 ++++++++++++++++++++++++++
> > drivers/gpu/drm/sun4i/sun50i_planes.h | 43 ++++++
> > 4 files changed, 257 insertions(+)
> > create mode 100644 drivers/gpu/drm/sun4i/sun50i_planes.c
> > create mode 100644 drivers/gpu/drm/sun4i/sun50i_planes.h
> >
> > diff --git a/drivers/gpu/drm/sun4i/Kconfig b/drivers/gpu/drm/sun4i/Kconfig
> > index b56ba00aabca..946dd7606094 100644
> > --- a/drivers/gpu/drm/sun4i/Kconfig
> > +++ b/drivers/gpu/drm/sun4i/Kconfig
> > @@ -85,4 +85,12 @@ config DRM_SUN8I_TCON_TOP
> > TCON TOP is responsible for configuring display pipeline for
> > HDMI, TVE and LCD.
> >
> > +config DRM_SUN50I_PLANES
> > + tristate
> > + default DRM_SUN4I if DRM_SUN8I_MIXER!=n
> > + help
> > + Chose this option if you have an Allwinner Soc with the
> > + Display Engine 3.3 or newer. Planes are shared resource
> > + between multiple mixers.
> > +
> > endif
> > diff --git a/drivers/gpu/drm/sun4i/Makefile b/drivers/gpu/drm/sun4i/Makefile
> > index bad7497a0d11..03f002abef15 100644
> > --- a/drivers/gpu/drm/sun4i/Makefile
> > +++ b/drivers/gpu/drm/sun4i/Makefile
> > @@ -38,3 +38,4 @@ obj-$(CONFIG_DRM_SUN6I_DSI) += sun6i_mipi_dsi.o
> > obj-$(CONFIG_DRM_SUN8I_DW_HDMI) += sun8i-drm-hdmi.o
> > obj-$(CONFIG_DRM_SUN8I_MIXER) += sun8i-mixer.o
> > obj-$(CONFIG_DRM_SUN8I_TCON_TOP) += sun8i_tcon_top.o
> > +obj-$(CONFIG_DRM_SUN50I_PLANES) += sun50i_planes.o
>
> I don't think you can have this as a separate module:
>
> a. You are using sun8i_vi_layer_init_one() and sun8i_ui_layer_init_one()
> from the sun8i-mixer module, and neither of them are exported symbols.
>
> b. You export sun50i_planes_setup() for sun8i-mixer to call, which ends
> up becoming a circular dependency.
>
> The easiest solution would be to just fold this into the sun8i-mixer module.
>
>
> > diff --git a/drivers/gpu/drm/sun4i/sun50i_planes.c b/drivers/gpu/drm/sun4i/sun50i_planes.c
> > new file mode 100644
> > index 000000000000..a99c01122990
> > --- /dev/null
> > +++ b/drivers/gpu/drm/sun4i/sun50i_planes.c
> > @@ -0,0 +1,205 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/* Copyright (c) 2025 Jernej Skrabec <jernej.skrabec@...il.com> */
> > +
> > +#include <linux/device.h>
> > +#include <linux/io.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/of_graph.h>
> > +#include <linux/platform_device.h>
> > +
> > +#include "sun50i_planes.h"
> > +#include "sun8i_ui_layer.h"
> > +#include "sun8i_vi_layer.h"
> > +
> > +static bool sun50i_planes_node_is_planes(struct device_node *node)
> > +{
> > + return !!of_match_node(sun50i_planes_of_table, node);
> > +}
> > +
> > +struct drm_plane **
> > +sun50i_planes_setup(struct device *dev, struct drm_device *drm,
> > + unsigned int mixer)
> > +{
> > + struct sun50i_planes *planes = dev_get_drvdata(dev);
> > + const struct sun50i_planes_quirks *quirks;
> > + struct drm_plane **drm_planes;
> > + const struct default_map *map;
> > + unsigned int i;
> > +
> > + if (!sun50i_planes_node_is_planes(dev->of_node)) {
> > + dev_err(dev, "Device is not planes driver!\n");
> > + return NULL;
> > + }
> > +
> > + if (!planes) {
> > + dev_err(dev, "Planes driver is not loaded yet!\n");
> > + return NULL;
> > + }
> > +
> > + if (mixer > 1) {
> > + dev_err(dev, "Mixer index is too high!\n");
> > + return NULL;
> > + }
> > +
> > + quirks = planes->quirks;
> > + map = &quirks->def_map[mixer];
> > +
> > + drm_planes = devm_kcalloc(drm->dev, map->num_ch + 1,
>
> Just a note: it seems we are missing the sentinel in sun8i_layers_init().
>
> > + sizeof(*drm_planes), GFP_KERNEL);
> > + if (!drm_planes)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + for (i = 0; i < map->num_ch; i++) {
> > + unsigned int phy_ch = map->map[i];
> > + struct sun8i_layer *layer;
> > + enum drm_plane_type type;
> > +
> > + if ((i == 0 && map->num_ch == 1) || i == 1)
> > + type = DRM_PLANE_TYPE_PRIMARY;
> > + else
> > + type = DRM_PLANE_TYPE_OVERLAY;
> > +
> > + if (phy_ch < UI_PLANE_OFFSET)
> > + layer = sun8i_vi_layer_init_one(drm, type, planes->regs,
> > + i, phy_ch, map->num_ch,
> > + &quirks->cfg);
> > + else
> > + layer = sun8i_ui_layer_init_one(drm, type, planes->regs,
> > + i, phy_ch, map->num_ch,
> > + &quirks->cfg);
> > +
> > + if (IS_ERR(layer)) {
> > + dev_err(drm->dev,
> > + "Couldn't initialize DRM plane\n");
> > + return ERR_CAST(layer);
> > + }
> > +
> > + drm_planes[i] = &layer->plane;
> > + }
> > +
> > + return drm_planes;
> > +}
> > +EXPORT_SYMBOL(sun50i_planes_setup);
> > +
> > +static void sun50i_planes_init_mapping(struct sun50i_planes *planes)
> > +{
> > + const struct sun50i_planes_quirks *quirks = planes->quirks;
> > + unsigned int i, j;
> > + u32 mapping;
> > +
> > + mapping = 0;
> > + for (j = 0; j < MAX_DISP; j++)
> > + for (i = 0; i < quirks->def_map[j].num_ch; i++) {
> > + unsigned int ch = quirks->def_map[j].map[i];
> > +
> > + if (ch < UI_PLANE_OFFSET)
> > + mapping |= j << (ch * 2);
> > + else
> > + mapping |= j << ((ch - UI_PLANE_OFFSET) * 2 + 16);
> > + }
> > + regmap_write(planes->mapping, SUNXI_DE33_DE_CHN2CORE_MUX_REG, mapping);
> > +
> > + for (j = 0; j < MAX_DISP; j++) {
> > + mapping = 0;
> > + for (i = 0; i < quirks->def_map[j].num_ch; i++) {
> > + unsigned int ch = quirks->def_map[j].map[i];
> > +
> > + if (ch >= UI_PLANE_OFFSET)
> > + ch += 2;
> > +
> > + mapping |= ch << (i * 4);
> > + }
> > + regmap_write(planes->mapping, SUNXI_DE33_DE_PORT02CHN_MUX_REG + j * 4, mapping);
> > + }
> > +}
> > +
> > +static const struct regmap_config sun50i_planes_regmap_config = {
> > + .name = "planes",
> > + .reg_bits = 32,
> > + .val_bits = 32,
> > + .reg_stride = 4,
> > + .max_register = 0x17fffc,
> > +};
> > +
> > +static int sun50i_planes_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct sun50i_planes *planes;
> > + void __iomem *regs;
> > +
> > + planes = devm_kzalloc(dev, sizeof(*planes), GFP_KERNEL);
> > + if (!planes)
> > + return -ENOMEM;
> > +
> > + planes->quirks = of_device_get_match_data(&pdev->dev);
> > + if (!planes->quirks)
> > + return dev_err_probe(dev, -EINVAL, "Unable to get quirks\n");
> > +
> > + planes->mapping = syscon_regmap_lookup_by_phandle(dev->of_node,
> > + "allwinner,plane-mapping");
> > + if (IS_ERR(planes->mapping))
> > + return dev_err_probe(dev, PTR_ERR(planes->mapping),
> > + "Unable to get mapping\n");
> > +
> > + regs = devm_platform_ioremap_resource(pdev, 0);
> > + if (IS_ERR(regs))
> > + return PTR_ERR(regs);
> > +
> > + planes->regs = devm_regmap_init_mmio(dev, regs, &sun50i_planes_regmap_config);
> > + if (IS_ERR(planes->regs))
> > + return PTR_ERR(planes->regs);
> > +
> > + dev_set_drvdata(dev, planes);
> > +
> > + sun50i_planes_init_mapping(planes);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct sun50i_planes_quirks sun50i_h616_planes_quirks = {
> > + .def_map = {
> > + {
> > + .map = {0, 6, 7},
> > + .num_ch = 3,
> > + },
> > + {
> > + .map = {1, 2, 8},
> > + .num_ch = 3,
> > + },
> > + },
> > + .cfg = {
> > + .de_type = SUN8I_MIXER_DE33,
> > + /*
> > + * TODO: All planes support scaling, but driver needs
> > + * improvements to properly support it.
> > + */
> > + .scaler_mask = 0,
> > + .scanline_yuv = 4096,
> > + },
> > +};
> > +
> > +/* sun4i_drv uses this list to check if a device node is a plane */
I didn't see any usage of this in patch 7. Is this part of another
series?
Maybe just export sun50i_planes_node_is_planes() instead?
> > +const struct of_device_id sun50i_planes_of_table[] = {
> > + {
> > + .compatible = "allwinner,sun50i-h616-de33-planes",
> > + .data = &sun50i_h616_planes_quirks
> > + },
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(of, sun50i_planes_of_table);
> > +EXPORT_SYMBOL(sun50i_planes_of_table);
> > +
> > +static struct platform_driver sun50i_planes_platform_driver = {
> > + .probe = sun50i_planes_probe,
> > + .driver = {
> > + .name = "sun50i-planes",
> > + .of_match_table = sun50i_planes_of_table,
> > + },
> > +};
> > +module_platform_driver(sun50i_planes_platform_driver);
> > +
> > +MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@...il.com>");
> > +MODULE_DESCRIPTION("Allwinner DE33 planes driver");
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/gpu/drm/sun4i/sun50i_planes.h b/drivers/gpu/drm/sun4i/sun50i_planes.h
> > new file mode 100644
> > index 000000000000..446feaeb03fc
> > --- /dev/null
> > +++ b/drivers/gpu/drm/sun4i/sun50i_planes.h
> > @@ -0,0 +1,43 @@
> > +/* SPDX-License-Identifier: GPL-2.0+ */
> > +/* Copyright (c) 2025 Jernej Skrabec <jernej.skrabec@...il.com> */
> > +
> > +#ifndef _SUN50I_PLANES_H_
> > +#define _SUN50I_PLANES_H_
> > +
> > +#include <drm/drm_device.h>
> > +#include <linux/regmap.h>
>
> I think you could move these two to the .c file, and just use forward
> declarations here.
>
> The rest looks OK.
>
>
> > +
> > +#include "sun8i_mixer.h"
> > +
> > +/* mapping registers, located in clock register space */
> > +#define SUNXI_DE33_DE_CHN2CORE_MUX_REG 0x24
> > +#define SUNXI_DE33_DE_PORT02CHN_MUX_REG 0x28
> > +#define SUNXI_DE33_DE_PORT12CHN_MUX_REG 0x2c
> > +
> > +#define MAX_DISP 2
> > +#define MAX_CHANNELS 8
> > +#define UI_PLANE_OFFSET 6
> > +
> > +struct default_map {
> > + unsigned int map[MAX_CHANNELS];
> > + unsigned int num_ch;
> > +};
> > +
> > +struct sun50i_planes_quirks {
> > + struct default_map def_map[MAX_DISP];
> > + struct sun8i_layer_cfg cfg;
> > +};
> > +
> > +struct sun50i_planes {
> > + struct regmap *regs;
> > + struct regmap *mapping;
> > + const struct sun50i_planes_quirks *quirks;
> > +};
> > +
> > +extern const struct of_device_id sun50i_planes_of_table[];
> > +
> > +struct drm_plane **
> > +sun50i_planes_setup(struct device *dev, struct drm_device *drm,
> > + unsigned int mixer);
> > +
> > +#endif /* _SUN50I_PLANES_H_ */
> > --
> > 2.51.2
> >
> >
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