On Sat, Nov 15, 2025 at 10:14 PM Jernej Skrabec <[email protected]> wrote: > > This driver serves just as planes sharing manager, needed for Display > Engine 3.3 and newer. > > Signed-off-by: Jernej Skrabec <[email protected]> > --- > 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 <[email protected]> */ > + > +#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 */ > +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 <[email protected]>"); > +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 <[email protected]> */ > + > +#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 > >
