@@ -5765,6 +5765,13 @@ S: Orphan / Obsolete
F: drivers/gpu/drm/savage/
F: include/uapi/drm/savage_drm.h
+DRM DRIVER FOR SIMPLE FRAMEBUFFERS
+M: Thomas Zimmermann <tzimmermann@suse.de>
+L: dri-devel@lists.freedesktop.org
+S: Maintained
+T: git git://anongit.freedesktop.org/drm/drm-misc
+F: drivers/gpu/drm/tiny/simplekms.c
+
DRM DRIVER FOR SIS VIDEO CARDS
S: Orphan / Obsolete
F: drivers/gpu/drm/sis/
@@ -38,6 +38,22 @@ config DRM_GM12U320
This is a KMS driver for projectors which use the GM12U320 chipset
for video transfer over USB2/3, such as the Acer C120 mini projector.
+config DRM_SIMPLEDRM
+ tristate "Simple framebuffer driver"
+ depends on DRM
+ select DRM_GEM_SHMEM_HELPER
+ select DRM_KMS_HELPER
+ help
+ DRM driver for simple platform-provided framebuffers.
+
+ This driver assumes that the display hardware has been initialized
+ by the firmware or bootloader before the kernel boots. Scanout
+ buffer, size, and display format must be provided via device tree,
+ UEFI, VESA, etc.
+
+ On x86 and compatible, you should also select CONFIG_X86_SYSFB to
+ use UEFI and VESA framebuffers.
+
config TINYDRM_HX8357D
tristate "DRM support for HX8357D display panels"
depends on DRM && SPI
@@ -3,6 +3,7 @@
obj-$(CONFIG_DRM_ARCPGU) += arcpgu.o
obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus.o
obj-$(CONFIG_DRM_GM12U320) += gm12u320.o
+obj-$(CONFIG_DRM_SIMPLEDRM) += simpledrm.o
obj-$(CONFIG_TINYDRM_HX8357D) += hx8357d.o
obj-$(CONFIG_TINYDRM_ILI9225) += ili9225.o
obj-$(CONFIG_TINYDRM_ILI9341) += ili9341.o
new file mode 100644
@@ -0,0 +1,545 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/platform_data/simplefb.h>
+#include <linux/platform_device.h>
+
+#include <drm/drm_atomic_state_helper.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_damage_helper.h>
+#include <drm/drm_device.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_shmem_helper.h>
+#include <drm/drm_managed.h>
+#include <drm/drm_modeset_helper_vtables.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+
+#define DRIVER_NAME "simpledrm"
+#define DRIVER_DESC "DRM driver for simple-framebuffer platform devices"
+#define DRIVER_DATE "20200625"
+#define DRIVER_MAJOR 1
+#define DRIVER_MINOR 0
+
+/*
+ * Assume a monitor resolution of 96 dpi to
+ * get a somewhat reasonable screen size.
+ */
+#define RES_MM(d) \
+ (((d) * 254ul) / (96ul * 10ul))
+
+#define SIMPLEDRM_MODE(hd, vd) \
+ DRM_SIMPLE_MODE(hd, vd, RES_MM(hd), RES_MM(vd))
+
+/*
+ * Helpers for simplefb
+ */
+
+static int
+simplefb_get_validated_int(struct drm_device *dev, const char *name,
+ uint32_t value)
+{
+ if (value > INT_MAX) {
+ drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
+ name, value);
+ return -EINVAL;
+ }
+ return (int)value;
+}
+
+static int
+simplefb_get_validated_int0(struct drm_device *dev, const char *name,
+ uint32_t value)
+{
+ if (!value) {
+ drm_err(dev, "simplefb: invalid framebuffer %s of %u\n",
+ name, value);
+ return -EINVAL;
+ }
+ return simplefb_get_validated_int(dev, name, value);
+}
+
+static const struct drm_format_info *
+simplefb_get_validated_format(struct drm_device *dev, const char *format_name)
+{
+ static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
+ const struct simplefb_format *fmt = formats;
+ const struct simplefb_format *end = fmt + ARRAY_SIZE(formats);
+
+ if (!format_name) {
+ drm_err(dev, "simplefb: missing framebuffer format\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ while (fmt < end) {
+ if (!strcmp(format_name, fmt->name))
+ return drm_format_info(fmt->fourcc);
+ ++fmt;
+ }
+
+ drm_err(dev, "simplefb: unknown framebuffer format %s\n",
+ format_name);
+
+ return ERR_PTR(-EINVAL);
+}
+
+static int
+simplefb_get_width_pd(struct drm_device *dev,
+ const struct simplefb_platform_data *pd)
+{
+ return simplefb_get_validated_int0(dev, "width", pd->width);
+}
+
+static int
+simplefb_get_height_pd(struct drm_device *dev,
+ const struct simplefb_platform_data *pd)
+{
+ return simplefb_get_validated_int0(dev, "height", pd->height);
+}
+
+static int
+simplefb_get_stride_pd(struct drm_device *dev,
+ const struct simplefb_platform_data *pd)
+{
+ return simplefb_get_validated_int(dev, "stride", pd->stride);
+}
+
+static const struct drm_format_info *
+simplefb_get_format_pd(struct drm_device *dev,
+ const struct simplefb_platform_data *pd)
+{
+ return simplefb_get_validated_format(dev, pd->format);
+}
+
+/*
+ * Simple Framebuffer device
+ */
+
+struct simpledrm_device {
+ struct drm_device dev;
+ struct platform_device *pdev;
+
+ /* simplefb settings */
+ struct drm_display_mode mode;
+ const struct drm_format_info *format;
+ unsigned int pitch;
+
+ /* memory management */
+ struct resource *mem;
+ void __iomem *screen_base;
+
+ /* modesetting */
+ uint32_t formats[8];
+ size_t nformats;
+ struct drm_connector connector;
+ struct drm_simple_display_pipe pipe;
+};
+
+static struct simpledrm_device *simpledrm_device_of_dev(struct drm_device *dev)
+{
+ return container_of(dev, struct simpledrm_device, dev);
+}
+
+/*
+ * Simplefb settings
+ */
+
+static struct drm_display_mode simpledrm_mode(unsigned int width,
+ unsigned int height)
+{
+ struct drm_display_mode mode = { SIMPLEDRM_MODE(width, height) };
+
+ mode.clock = 60 /* Hz */ * mode.hdisplay * mode.vdisplay;
+ drm_mode_set_name(&mode);
+
+ return mode;
+}
+
+static int simpledrm_device_init_fb(struct simpledrm_device *sdev)
+{
+ int width, height, stride;
+ const struct drm_format_info *format;
+ struct drm_format_name_buf buf;
+ struct drm_device *dev = &sdev->dev;
+ struct platform_device *pdev = sdev->pdev;
+ const struct simplefb_platform_data *pd = dev_get_platdata(&pdev->dev);
+
+ if (pd) {
+ width = simplefb_get_width_pd(dev, pd);
+ if (width < 0)
+ return width;
+ height = simplefb_get_height_pd(dev, pd);
+ if (height < 0)
+ return height;
+ stride = simplefb_get_stride_pd(dev, pd);
+ if (stride < 0)
+ return stride;
+ format = simplefb_get_format_pd(dev, pd);
+ if (IS_ERR(format))
+ return PTR_ERR(format);
+ } else {
+ drm_err(dev, "no simplefb configuration found\n");
+ return -ENODEV;
+ }
+
+ sdev->mode = simpledrm_mode(width, height);
+ sdev->format = format;
+ sdev->pitch = stride;
+
+ drm_dbg_kms(dev, "display mode={" DRM_MODE_FMT "}\n",
+ DRM_MODE_ARG(&sdev->mode));
+ drm_dbg_kms(dev,
+ "framebuffer format=\"%s\", size=%dx%d, stride=%d byte\n",
+ drm_get_format_name(format->format, &buf), width,
+ height, stride);
+
+ return 0;
+}
+
+/*
+ * Memory management
+ */
+
+static int simpledrm_device_init_mm(struct simpledrm_device *sdev)
+{
+ struct platform_device *pdev = sdev->pdev;
+ struct resource *mem;
+ void __iomem *screen_base;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem)
+ return -EINVAL;
+
+ screen_base = devm_ioremap_wc(&pdev->dev, mem->start,
+ resource_size(mem));
+ if (!screen_base)
+ return -ENOMEM;
+
+ sdev->mem = mem;
+ sdev->screen_base = screen_base;
+
+ return 0;
+}
+
+/*
+ * Modesetting
+ */
+
+/*
+ * Support all formats of simplefb and maybe more; in order
+ * of preference. The display's update function will do any
+ * conversion necessary.
+ *
+ * TODO: Add blit helpers for remaining formats and uncomment
+ * constants.
+ */
+static const uint32_t simpledrm_default_formats[] = {
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_ARGB8888,
+ DRM_FORMAT_RGB565,
+ //DRM_FORMAT_XRGB1555,
+ //DRM_FORMAT_ARGB1555,
+ DRM_FORMAT_RGB888,
+ //DRM_FORMAT_XRGB2101010,
+ //DRM_FORMAT_ARGB2101010,
+};
+
+static const uint64_t simpledrm_format_modifiers[] = {
+ DRM_FORMAT_MOD_LINEAR,
+ DRM_FORMAT_MOD_INVALID
+};
+
+static int simpledrm_connector_helper_get_modes(struct drm_connector *connector)
+{
+ struct simpledrm_device *sdev = simpledrm_device_of_dev(connector->dev);
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(connector->dev, &sdev->mode);
+ if (!mode)
+ return 0;
+
+ if (mode->name[0] == '\0')
+ drm_mode_set_name(mode);
+
+ mode->type |= DRM_MODE_TYPE_PREFERRED;
+ drm_mode_probed_add(connector, mode);
+
+ if (mode->width_mm)
+ connector->display_info.width_mm = mode->width_mm;
+ if (mode->height_mm)
+ connector->display_info.height_mm = mode->height_mm;
+
+ return 1;
+}
+
+static const struct drm_connector_helper_funcs simpledrm_connector_helper_funcs = {
+ .get_modes = simpledrm_connector_helper_get_modes,
+};
+
+static const struct drm_connector_funcs simpledrm_connector_funcs = {
+ .reset = drm_atomic_helper_connector_reset,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = drm_connector_cleanup,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int
+simpledrm_simple_display_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
+ const struct drm_display_mode *mode)
+{
+ struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
+
+ if (mode->hdisplay != sdev->mode.hdisplay &&
+ mode->vdisplay != sdev->mode.vdisplay)
+ return MODE_ONE_SIZE;
+ else if (mode->hdisplay != sdev->mode.hdisplay)
+ return MODE_ONE_WIDTH;
+ else if (mode->vdisplay != sdev->mode.vdisplay)
+ return MODE_ONE_HEIGHT;
+
+ return MODE_OK;
+}
+
+static void
+simpledrm_simple_display_pipe_enable(struct drm_simple_display_pipe *pipe,
+ struct drm_crtc_state *crtc_state,
+ struct drm_plane_state *plane_state)
+{
+ struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
+ struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+ struct drm_framebuffer *fb = plane_state->fb;
+ void *vmap = shadow_plane_state->map[0].vaddr; /* TODO: Use mapping abstraction properly */
+
+ if (!fb)
+ return;
+
+ drm_fb_blit_dstclip(sdev->screen_base, sdev->pitch,
+ sdev->format->format, vmap, fb);
+}
+
+static void
+simpledrm_simple_display_pipe_disable(struct drm_simple_display_pipe *pipe)
+{
+ struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
+ struct drm_device *dev = &sdev->dev;
+ int idx;
+
+ if (!drm_dev_enter(dev, &idx))
+ return;
+
+ /* Clear screen to black if disabled */
+ memset_io(sdev->screen_base, 0, sdev->pitch * sdev->mode.vdisplay);
+
+ drm_dev_exit(idx);
+}
+
+static void
+simpledrm_simple_display_pipe_update(struct drm_simple_display_pipe *pipe,
+ struct drm_plane_state *old_plane_state)
+{
+ struct simpledrm_device *sdev = simpledrm_device_of_dev(pipe->crtc.dev);
+ struct drm_plane_state *plane_state = pipe->plane.state;
+ struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+ void *vmap = shadow_plane_state->map[0].vaddr; /* TODO: Use mapping abstraction properly */
+ struct drm_framebuffer *fb = plane_state->fb;
+ struct drm_rect clip;
+
+ if (!fb)
+ return;
+
+ if (!drm_atomic_helper_damage_merged(old_plane_state, plane_state, &clip))
+ return;
+
+ drm_fb_blit_rect_dstclip(sdev->screen_base, sdev->pitch,
+ sdev->format->format, vmap, fb, &clip);
+}
+
+static const struct drm_simple_display_pipe_funcs
+simpledrm_simple_display_pipe_funcs = {
+ .mode_valid = simpledrm_simple_display_pipe_mode_valid,
+ .enable = simpledrm_simple_display_pipe_enable,
+ .disable = simpledrm_simple_display_pipe_disable,
+ .update = simpledrm_simple_display_pipe_update,
+ DRM_GEM_SIMPLE_DISPLAY_PIPE_SHADOW_PLANE_FUNCS,
+};
+
+static const struct drm_mode_config_funcs simpledrm_mode_config_funcs = {
+ .fb_create = drm_gem_fb_create_with_dirty,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+static const uint32_t *simpledrm_device_formats(struct simpledrm_device *sdev,
+ size_t *nformats_out)
+{
+ struct drm_device *dev = &sdev->dev;
+ size_t i;
+
+ if (sdev->nformats)
+ goto out; /* don't rebuild list on recurring calls */
+
+ /* native format goes first */
+ sdev->formats[0] = sdev->format->format;
+ sdev->nformats = 1;
+
+ /* default formats go second */
+ for (i = 0; i < ARRAY_SIZE(simpledrm_default_formats); ++i) {
+ if (simpledrm_default_formats[i] == sdev->format->format)
+ continue; /* native format already went first */
+ sdev->formats[sdev->nformats] = simpledrm_default_formats[i];
+ sdev->nformats++;
+ }
+
+ /*
+ * TODO: The simpledrm driver converts framebuffers to the native
+ * format when copying them to device memory. If there are more
+ * formats listed than supported by the driver, the native format
+ * is not supported by the conversion helpers. Therefore *only*
+ * support the native format and add a conversion helper ASAP.
+ */
+ if (drm_WARN_ONCE(dev, i != sdev->nformats,
+ "format conversion helpers required for %p4cc",
+ &sdev->format->format)) {
+ sdev->nformats = 1;
+ }
+
+out:
+ *nformats_out = sdev->nformats;
+ return sdev->formats;
+}
+
+static int simpledrm_device_init_modeset(struct simpledrm_device *sdev)
+{
+ struct drm_device *dev = &sdev->dev;
+ struct drm_display_mode *mode = &sdev->mode;
+ struct drm_connector *connector = &sdev->connector;
+ struct drm_simple_display_pipe *pipe = &sdev->pipe;
+ const uint32_t *formats;
+ size_t nformats;
+ int ret;
+
+ ret = drmm_mode_config_init(dev);
+ if (ret)
+ return ret;
+
+ dev->mode_config.min_width = mode->hdisplay;
+ dev->mode_config.max_width = mode->hdisplay;
+ dev->mode_config.min_height = mode->vdisplay;
+ dev->mode_config.max_height = mode->vdisplay;
+ dev->mode_config.prefer_shadow_fbdev = true;
+ dev->mode_config.preferred_depth = sdev->format->cpp[0] * 8;
+ dev->mode_config.funcs = &simpledrm_mode_config_funcs;
+
+ ret = drm_connector_init(dev, connector, &simpledrm_connector_funcs,
+ DRM_MODE_CONNECTOR_Unknown);
+ if (ret)
+ return ret;
+ drm_connector_helper_add(connector, &simpledrm_connector_helper_funcs);
+
+ formats = simpledrm_device_formats(sdev, &nformats);
+
+ ret = drm_simple_display_pipe_init(dev, pipe, &simpledrm_simple_display_pipe_funcs,
+ formats, nformats, simpledrm_format_modifiers,
+ connector);
+ if (ret)
+ return ret;
+
+ drm_mode_config_reset(dev);
+
+ return 0;
+}
+
+/*
+ * Init / Cleanup
+ */
+
+static struct simpledrm_device *
+simpledrm_device_create(struct drm_driver *drv, struct platform_device *pdev)
+{
+ struct simpledrm_device *sdev;
+ int ret;
+
+ sdev = devm_drm_dev_alloc(&pdev->dev, drv, struct simpledrm_device,
+ dev);
+ if (IS_ERR(sdev))
+ return ERR_CAST(sdev);
+ sdev->pdev = pdev;
+ platform_set_drvdata(pdev, sdev);
+
+ ret = simpledrm_device_init_fb(sdev);
+ if (ret)
+ return ERR_PTR(ret);
+ ret = simpledrm_device_init_mm(sdev);
+ if (ret)
+ return ERR_PTR(ret);
+ ret = simpledrm_device_init_modeset(sdev);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return sdev;
+}
+
+/*
+ * DRM driver
+ */
+
+DEFINE_DRM_GEM_FOPS(simpledrm_fops);
+
+static struct drm_driver simpledrm_driver = {
+ DRM_GEM_SHMEM_DRIVER_OPS,
+ .name = DRIVER_NAME,
+ .desc = DRIVER_DESC,
+ .date = DRIVER_DATE,
+ .major = DRIVER_MAJOR,
+ .minor = DRIVER_MINOR,
+ .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
+ .fops = &simpledrm_fops,
+};
+
+/*
+ * Platform driver
+ */
+
+static int simpledrm_probe(struct platform_device *pdev)
+{
+ struct simpledrm_device *sdev;
+ struct drm_device *dev;
+ int ret;
+
+ sdev = simpledrm_device_create(&simpledrm_driver, pdev);
+ if (IS_ERR(sdev))
+ return PTR_ERR(sdev);
+ dev = &sdev->dev;
+
+ ret = drm_dev_register(dev, 0);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int simpledrm_remove(struct platform_device *pdev)
+{
+ struct simpledrm_device *sdev = platform_get_drvdata(pdev);
+ struct drm_device *dev = &sdev->dev;
+
+ drm_dev_unregister(dev);
+
+ return 0;
+}
+
+static struct platform_driver simpledrm_platform_driver = {
+ .driver = {
+ .name = "simple-framebuffer", /* connect to sysfb */
+ },
+ .probe = simpledrm_probe,
+ .remove = simpledrm_remove,
+};
+
+module_platform_driver(simpledrm_platform_driver);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL v2");