* [PATCH v3 1/4] drm/ofdrm: Add ofdrm for Open Firmware framebuffers
2022-09-22 11:33 [PATCH v3 0/4] drm: Add driver for PowerPC OF displays Thomas Zimmermann
@ 2022-09-22 11:33 ` Thomas Zimmermann
2022-09-23 7:14 ` Geert Uytterhoeven
2022-09-22 11:33 ` [PATCH v3 2/4] drm/ofdrm: Add CRTC state Thomas Zimmermann
` (2 subsequent siblings)
3 siblings, 1 reply; 9+ messages in thread
From: Thomas Zimmermann @ 2022-09-22 11:33 UTC (permalink / raw)
To: javierm, airlied, daniel, deller, maxime, sam, msuchanek, mpe,
benh, paulus, geert, mark.cave-ayland
Cc: linux-fbdev, linuxppc-dev, Thomas Zimmermann, dri-devel
Open Firmware provides basic display output via the 'display' node.
DT platform code already provides a device that represents the node's
framebuffer. Add a DRM driver for the device. The display mode and
color format is pre-initialized by the system's firmware. Runtime
modesetting via DRM is not possible. The display is useful during
early boot stages or as error fallback.
Similar functionality is already provided by fbdev's offb driver,
which is insufficient for modern userspace. The old driver includes
support for BootX device tree, which can be found on old 32-bit
PowerPC Macintosh systems. If these are still in use, the
functionality can be added to ofdrm or implemented in a new
driver. As with simpledrm, the fbdev driver cannot be selected if
ofdrm is already enabled.
Two notable points about the driver:
* Reading the framebuffer aperture from the device tree is not
reliable on all systems. Ofdrm takes the heuristics and a comment
from offb to pick the correct range.
* No resource management may be tied to the underlying PCI device.
Otherwise the handover to the native driver will fail with a resource
conflict. PCI management is therefore done as part of the platform
device's cleanup.
The driver has been tested on qemu's ppc64le emulation. The device
hand-over has been tested with bochs.
v3:
* reintegrate FWFB helpers into ofdrm
* use damage iterator
* sync GEM BOs with drm_gem_fb_{begin,end}_cpu_access()
* fix various atomic_check helpers
* remove CRTC atomic_{enable,disable} (Javier)
* compute stride with drm_format_info_min_pitch() (Daniel)
v2:
* removed simple-pipe helpers
* built driver on top of FWFB helpers
* merged all init code into single function
* make PCI support optional (Michal)
* support COMPILE_TEST (Javier)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
---
MAINTAINERS | 1 +
drivers/gpu/drm/tiny/Kconfig | 13 +
drivers/gpu/drm/tiny/Makefile | 1 +
drivers/gpu/drm/tiny/ofdrm.c | 741 ++++++++++++++++++++++++++++++++++
drivers/video/fbdev/Kconfig | 1 +
5 files changed, 757 insertions(+)
create mode 100644 drivers/gpu/drm/tiny/ofdrm.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 5dea02ce7b24..55f3a9def47f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6655,6 +6655,7 @@ L: dri-devel@lists.freedesktop.org
S: Maintained
T: git git://anongit.freedesktop.org/drm/drm-misc
F: drivers/gpu/drm/drm_aperture.c
+F: drivers/gpu/drm/tiny/ofdrm.c
F: drivers/gpu/drm/tiny/simpledrm.c
F: drivers/video/aperture.c
F: include/drm/drm_aperture.h
diff --git a/drivers/gpu/drm/tiny/Kconfig b/drivers/gpu/drm/tiny/Kconfig
index 565957264875..a300b03a3c7a 100644
--- a/drivers/gpu/drm/tiny/Kconfig
+++ b/drivers/gpu/drm/tiny/Kconfig
@@ -51,6 +51,19 @@ 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_OFDRM
+ tristate "Open Firmware display driver"
+ depends on DRM && OF && (PPC || COMPILE_TEST)
+ select APERTURE_HELPERS
+ select DRM_GEM_SHMEM_HELPER
+ select DRM_KMS_HELPER
+ help
+ DRM driver for Open Firmware framebuffers.
+
+ This driver assumes that the display hardware has been initialized
+ by the Open Firmware before the kernel boots. Scanout buffer, size,
+ and display format must be provided via device tree.
+
config DRM_PANEL_MIPI_DBI
tristate "DRM support for MIPI DBI compatible panels"
depends on DRM && SPI
diff --git a/drivers/gpu/drm/tiny/Makefile b/drivers/gpu/drm/tiny/Makefile
index 1d9d6227e7ab..76dde89a044b 100644
--- a/drivers/gpu/drm/tiny/Makefile
+++ b/drivers/gpu/drm/tiny/Makefile
@@ -4,6 +4,7 @@ obj-$(CONFIG_DRM_ARCPGU) += arcpgu.o
obj-$(CONFIG_DRM_BOCHS) += bochs.o
obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus.o
obj-$(CONFIG_DRM_GM12U320) += gm12u320.o
+obj-$(CONFIG_DRM_OFDRM) += ofdrm.o
obj-$(CONFIG_DRM_PANEL_MIPI_DBI) += panel-mipi-dbi.o
obj-$(CONFIG_DRM_SIMPLEDRM) += simpledrm.o
obj-$(CONFIG_TINYDRM_HX8357D) += hx8357d.o
diff --git a/drivers/gpu/drm/tiny/ofdrm.c b/drivers/gpu/drm/tiny/ofdrm.c
new file mode 100644
index 000000000000..5ac9aa769513
--- /dev/null
+++ b/drivers/gpu/drm/tiny/ofdrm.c
@@ -0,0 +1,741 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/of_address.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+
+#include <drm/drm_aperture.h>
+#include <drm/drm_atomic.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_fb_helper.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_plane_helper.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+
+#define DRIVER_NAME "ofdrm"
+#define DRIVER_DESC "DRM driver for OF platform devices"
+#define DRIVER_DATE "20220501"
+#define DRIVER_MAJOR 1
+#define DRIVER_MINOR 0
+
+/*
+ * Helpers for display nodes
+ */
+
+static int display_get_validated_int(struct drm_device *dev, const char *name, uint32_t value)
+{
+ if (value > INT_MAX) {
+ drm_err(dev, "invalid framebuffer %s of %u\n", name, value);
+ return -EINVAL;
+ }
+ return (int)value;
+}
+
+static int display_get_validated_int0(struct drm_device *dev, const char *name, uint32_t value)
+{
+ if (!value) {
+ drm_err(dev, "invalid framebuffer %s of %u\n", name, value);
+ return -EINVAL;
+ }
+ return display_get_validated_int(dev, name, value);
+}
+
+static const struct drm_format_info *display_get_validated_format(struct drm_device *dev,
+ u32 depth)
+{
+ const struct drm_format_info *info;
+ u32 format;
+
+ switch (depth) {
+ case 8:
+ format = drm_mode_legacy_fb_format(8, 8);
+ break;
+ case 15:
+ case 16:
+ format = drm_mode_legacy_fb_format(16, depth);
+ break;
+ case 32:
+ format = drm_mode_legacy_fb_format(32, 24);
+ break;
+ default:
+ drm_err(dev, "unsupported framebuffer depth %u\n", depth);
+ return ERR_PTR(-EINVAL);
+ }
+
+ info = drm_format_info(format);
+ if (!info) {
+ drm_err(dev, "cannot find framebuffer format for depth %u\n", depth);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return info;
+}
+
+static int display_read_u32_of(struct drm_device *dev, struct device_node *of_node,
+ const char *name, u32 *value)
+{
+ int ret = of_property_read_u32(of_node, name, value);
+
+ if (ret)
+ drm_err(dev, "cannot parse framebuffer %s: error %d\n", name, ret);
+ return ret;
+}
+
+static int display_get_width_of(struct drm_device *dev, struct device_node *of_node)
+{
+ u32 width;
+ int ret = display_read_u32_of(dev, of_node, "width", &width);
+
+ if (ret)
+ return ret;
+ return display_get_validated_int0(dev, "width", width);
+}
+
+static int display_get_height_of(struct drm_device *dev, struct device_node *of_node)
+{
+ u32 height;
+ int ret = display_read_u32_of(dev, of_node, "height", &height);
+
+ if (ret)
+ return ret;
+ return display_get_validated_int0(dev, "height", height);
+}
+
+static const struct drm_format_info *display_get_format_of(struct drm_device *dev,
+ struct device_node *of_node)
+{
+ u32 depth;
+ int ret = display_read_u32_of(dev, of_node, "depth", &depth);
+
+ if (ret)
+ return ERR_PTR(ret);
+ return display_get_validated_format(dev, depth);
+}
+
+static int display_get_linebytes_of(struct drm_device *dev, struct device_node *of_node)
+{
+ u32 linebytes;
+ int ret = display_read_u32_of(dev, of_node, "linebytes", &linebytes);
+
+ if (ret)
+ return ret;
+ return display_get_validated_int(dev, "linebytes", linebytes);
+}
+
+static u64 display_get_address_of(struct drm_device *dev, struct device_node *of_node)
+{
+ u32 address;
+ int ret;
+
+ /*
+ * Not all devices provide an address property, it's not
+ * a bug if this fails. The driver will try to find the
+ * framebuffer base address from the device's memory regions.
+ */
+ ret = of_property_read_u32(of_node, "address", &address);
+ if (ret)
+ return OF_BAD_ADDR;
+
+ return address;
+}
+
+/*
+ * Open Firmware display device
+ */
+
+struct ofdrm_device {
+ struct drm_device dev;
+ struct platform_device *pdev;
+
+ /* simplefb settings */
+ struct iosys_map screen_base;
+ struct drm_display_mode mode;
+ const struct drm_format_info *format;
+ unsigned int pitch;
+
+ /* modesetting */
+ uint32_t formats[8];
+ struct drm_plane primary_plane;
+ struct drm_crtc crtc;
+ struct drm_encoder encoder;
+ struct drm_connector connector;
+};
+
+static struct ofdrm_device *ofdrm_device_of_dev(struct drm_device *dev)
+{
+ return container_of(dev, struct ofdrm_device, dev);
+}
+
+/*
+ * Hardware
+ */
+
+#if defined(CONFIG_PCI)
+static struct pci_dev *display_get_pci_dev_of(struct drm_device *dev, struct device_node *of_node)
+{
+ const __be32 *vendor_p, *device_p;
+ u32 vendor, device;
+ struct pci_dev *pcidev;
+
+ vendor_p = of_get_property(of_node, "vendor-id", NULL);
+ if (!vendor_p)
+ return ERR_PTR(-ENODEV);
+ vendor = be32_to_cpup(vendor_p);
+
+ device_p = of_get_property(of_node, "device-id", NULL);
+ if (!device_p)
+ return ERR_PTR(-ENODEV);
+ device = be32_to_cpup(device_p);
+
+ pcidev = pci_get_device(vendor, device, NULL);
+ if (!pcidev)
+ return ERR_PTR(-ENODEV);
+
+ return pcidev;
+}
+
+static void ofdrm_pci_release(void *data)
+{
+ struct pci_dev *pcidev = data;
+
+ pci_disable_device(pcidev);
+}
+
+static int ofdrm_device_init_pci(struct ofdrm_device *odev)
+{
+ struct drm_device *dev = &odev->dev;
+ struct platform_device *pdev = to_platform_device(dev->dev);
+ struct device_node *of_node = pdev->dev.of_node;
+ struct pci_dev *pcidev;
+ int ret;
+
+ /*
+ * Never use pcim_ or other managed helpers on the returned PCI
+ * device. Otherwise, probing the native driver will fail for
+ * resource conflicts. PCI-device management has to be tied to
+ * the lifetime of the platform device until the native driver
+ * takes over.
+ */
+ pcidev = display_get_pci_dev_of(dev, of_node);
+ if (IS_ERR(pcidev))
+ return 0; /* no PCI device found; ignore the error */
+
+ ret = pci_enable_device(pcidev);
+ if (ret) {
+ drm_err(dev, "pci_enable_device(%s) failed: %d\n",
+ dev_name(&pcidev->dev), ret);
+ return ret;
+ }
+ ret = devm_add_action_or_reset(&pdev->dev, ofdrm_pci_release, pcidev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+#else
+static int ofdrm_device_init_pci(struct ofdrm_device *odev)
+{
+ return 0;
+}
+#endif
+
+/*
+ * OF display settings
+ */
+
+static struct resource *ofdrm_find_fb_resource(struct ofdrm_device *odev,
+ struct resource *fb_res)
+{
+ struct platform_device *pdev = to_platform_device(odev->dev.dev);
+ struct resource *res, *max_res = NULL;
+ u32 i;
+
+ for (i = 0; pdev->num_resources; ++i) {
+ res = platform_get_resource(pdev, IORESOURCE_MEM, i);
+ if (!res)
+ break; /* all resources processed */
+ if (resource_size(res) < resource_size(fb_res))
+ continue; /* resource too small */
+ if (fb_res->start && resource_contains(res, fb_res))
+ return res; /* resource contains framebuffer */
+ if (!max_res || resource_size(res) > resource_size(max_res))
+ max_res = res; /* store largest resource as fallback */
+ }
+
+ return max_res;
+}
+
+/*
+ * Modesetting
+ */
+
+/*
+ * Support all formats of OF display 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 ofdrm_primary_plane_formats[] = {
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_RGB565,
+ //DRM_FORMAT_XRGB1555,
+ //DRM_FORMAT_C8,
+};
+
+static const uint64_t ofdrm_primary_plane_format_modifiers[] = {
+ DRM_FORMAT_MOD_LINEAR,
+ DRM_FORMAT_MOD_INVALID
+};
+
+static int ofdrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
+ struct drm_atomic_state *new_state)
+{
+ struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(new_state, plane);
+ struct drm_crtc *new_crtc = new_plane_state->crtc;
+ struct drm_crtc_state *new_crtc_state = NULL;
+
+ if (new_crtc)
+ new_crtc_state = drm_atomic_get_new_crtc_state(new_state, new_plane_state->crtc);
+
+ return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
+ DRM_PLANE_NO_SCALING,
+ DRM_PLANE_NO_SCALING,
+ false, false);
+}
+
+static void ofdrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
+ struct drm_atomic_state *state)
+{
+ struct drm_device *dev = plane->dev;
+ struct ofdrm_device *odev = ofdrm_device_of_dev(dev);
+ struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
+ struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+ struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
+ struct drm_framebuffer *fb = plane_state->fb;
+ unsigned int dst_pitch = odev->pitch;
+ const struct drm_format_info *dst_format = odev->format;
+ struct drm_atomic_helper_damage_iter iter;
+ struct drm_rect damage;
+ int ret, idx;
+
+ ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
+ if (ret)
+ return;
+
+ if (!drm_dev_enter(dev, &idx))
+ goto out_drm_gem_fb_end_cpu_access;
+
+ drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
+ drm_atomic_for_each_plane_damage(&iter, &damage) {
+ struct iosys_map dst = odev->screen_base;
+ struct drm_rect dst_clip = plane_state->dst;
+
+ if (!drm_rect_intersect(&dst_clip, &damage))
+ continue;
+
+ iosys_map_incr(&dst, drm_fb_clip_offset(dst_pitch, dst_format, &dst_clip));
+ drm_fb_blit(&dst, &dst_pitch, dst_format->format, shadow_plane_state->data, fb,
+ &damage);
+ }
+
+ drm_dev_exit(idx);
+out_drm_gem_fb_end_cpu_access:
+ drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
+}
+
+static void ofdrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,
+ struct drm_atomic_state *state)
+{
+ struct drm_device *dev = plane->dev;
+ struct ofdrm_device *odev = ofdrm_device_of_dev(dev);
+ struct iosys_map dst = odev->screen_base;
+ struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
+ void __iomem *dst_vmap = dst.vaddr_iomem; /* TODO: Use mapping abstraction */
+ unsigned int dst_pitch = odev->pitch;
+ const struct drm_format_info *dst_format = odev->format;
+ struct drm_rect dst_clip;
+ unsigned long lines, linepixels, i;
+ int idx;
+
+ drm_rect_init(&dst_clip,
+ plane_state->src_x >> 16, plane_state->src_y >> 16,
+ plane_state->src_w >> 16, plane_state->src_h >> 16);
+
+ lines = drm_rect_height(&dst_clip);
+ linepixels = drm_rect_width(&dst_clip);
+
+ if (!drm_dev_enter(dev, &idx))
+ return;
+
+ /* Clear buffer to black if disabled */
+ dst_vmap += drm_fb_clip_offset(dst_pitch, dst_format, &dst_clip);
+ for (i = 0; i < lines; ++i) {
+ memset_io(dst_vmap, 0, linepixels * dst_format->cpp[0]);
+ dst_vmap += dst_pitch;
+ }
+
+ drm_dev_exit(idx);
+}
+
+static const struct drm_plane_helper_funcs ofdrm_primary_plane_helper_funcs = {
+ DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
+ .atomic_check = ofdrm_primary_plane_helper_atomic_check,
+ .atomic_update = ofdrm_primary_plane_helper_atomic_update,
+ .atomic_disable = ofdrm_primary_plane_helper_atomic_disable,
+};
+
+static const struct drm_plane_funcs ofdrm_primary_plane_funcs = {
+ .update_plane = drm_atomic_helper_update_plane,
+ .disable_plane = drm_atomic_helper_disable_plane,
+ .destroy = drm_plane_cleanup,
+ DRM_GEM_SHADOW_PLANE_FUNCS,
+};
+
+static enum drm_mode_status ofdrm_crtc_helper_mode_valid(struct drm_crtc *crtc,
+ const struct drm_display_mode *mode)
+{
+ struct ofdrm_device *odev = ofdrm_device_of_dev(crtc->dev);
+
+ return drm_crtc_helper_mode_valid_fixed(crtc, mode, &odev->mode);
+}
+
+static int ofdrm_crtc_helper_atomic_check(struct drm_crtc *crtc,
+ struct drm_atomic_state *new_state)
+{
+ struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(new_state, crtc);
+
+ return drm_atomic_helper_check_crtc_state(new_crtc_state, false);
+}
+
+/*
+ * The CRTC is always enabled. Screen updates are performed by
+ * the primary plane's atomic_update function. Disabling clears
+ * the screen in the primary plane's atomic_disable function.
+ */
+static const struct drm_crtc_helper_funcs ofdrm_crtc_helper_funcs = {
+ .mode_valid = ofdrm_crtc_helper_mode_valid,
+ .atomic_check = ofdrm_crtc_helper_atomic_check,
+};
+
+static const struct drm_crtc_funcs ofdrm_crtc_funcs = {
+ .reset = drm_atomic_helper_crtc_reset,
+ .destroy = drm_crtc_cleanup,
+ .set_config = drm_atomic_helper_set_config,
+ .page_flip = drm_atomic_helper_page_flip,
+ .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static int ofdrm_connector_helper_get_modes(struct drm_connector *connector)
+{
+ struct ofdrm_device *odev = ofdrm_device_of_dev(connector->dev);
+
+ return drm_connector_helper_get_modes_fixed(connector, &odev->mode);
+}
+
+static const struct drm_connector_helper_funcs ofdrm_connector_helper_funcs = {
+ .get_modes = ofdrm_connector_helper_get_modes,
+};
+
+static const struct drm_connector_funcs ofdrm_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 const struct drm_mode_config_funcs ofdrm_mode_config_funcs = {
+ .fb_create = drm_gem_fb_create_with_dirty,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+/*
+ * Init / Cleanup
+ */
+
+static struct drm_display_mode ofdrm_mode(unsigned int width, unsigned int height)
+{
+ /*
+ * Assume a monitor resolution of 96 dpi to
+ * get a somewhat reasonable screen size.
+ */
+ const struct drm_display_mode mode = {
+ DRM_MODE_INIT(60, width, height,
+ DRM_MODE_RES_MM(width, 96ul),
+ DRM_MODE_RES_MM(height, 96ul))
+ };
+
+ return mode;
+}
+
+static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
+ struct platform_device *pdev)
+{
+ struct device_node *of_node = pdev->dev.of_node;
+ struct ofdrm_device *odev;
+ struct drm_device *dev;
+ int width, height, linebytes;
+ const struct drm_format_info *format;
+ u64 address;
+ resource_size_t fb_size, fb_base, fb_pgbase, fb_pgsize;
+ struct resource *res, *mem;
+ void __iomem *screen_base;
+ struct drm_plane *primary_plane;
+ struct drm_crtc *crtc;
+ struct drm_encoder *encoder;
+ struct drm_connector *connector;
+ unsigned long max_width, max_height;
+ size_t nformats;
+ int ret;
+
+ odev = devm_drm_dev_alloc(&pdev->dev, drv, struct ofdrm_device, dev);
+ if (IS_ERR(odev))
+ return ERR_CAST(odev);
+ dev = &odev->dev;
+ platform_set_drvdata(pdev, dev);
+
+ ret = ofdrm_device_init_pci(odev);
+ if (ret)
+ return ERR_PTR(ret);
+
+ /*
+ * OF display-node settings
+ */
+
+ width = display_get_width_of(dev, of_node);
+ if (width < 0)
+ return ERR_PTR(width);
+ height = display_get_height_of(dev, of_node);
+ if (height < 0)
+ return ERR_PTR(height);
+ format = display_get_format_of(dev, of_node);
+ if (IS_ERR(format))
+ return ERR_CAST(format);
+ linebytes = display_get_linebytes_of(dev, of_node);
+ if (linebytes < 0) {
+ return ERR_PTR(linebytes);
+ } else if (!linebytes) {
+ linebytes = drm_format_info_min_pitch(format, 0, width);
+ if (drm_WARN_ON(dev, !linebytes))
+ return ERR_PTR(-EINVAL);
+ }
+ fb_size = linebytes * height;
+
+ /*
+ * Try to figure out the address of the framebuffer. Unfortunately, Open
+ * Firmware doesn't provide a standard way to do so. All we can do is a
+ * dodgy heuristic that happens to work in practice.
+ *
+ * On most machines, the "address" property contains what we need, though
+ * not on Matrox cards found in IBM machines. What appears to give good
+ * results is to go through the PCI ranges and pick one that encloses the
+ * "address" property. If none match, we pick the largest.
+ */
+ address = display_get_address_of(dev, of_node);
+ if (address != OF_BAD_ADDR) {
+ struct resource fb_res = DEFINE_RES_MEM(address, fb_size);
+
+ res = ofdrm_find_fb_resource(odev, &fb_res);
+ if (!res)
+ return ERR_PTR(-EINVAL);
+ if (resource_contains(res, &fb_res))
+ fb_base = address;
+ else
+ fb_base = res->start;
+ } else {
+ struct resource fb_res = DEFINE_RES_MEM(0u, fb_size);
+
+ res = ofdrm_find_fb_resource(odev, &fb_res);
+ if (!res)
+ return ERR_PTR(-EINVAL);
+ fb_base = res->start;
+ }
+
+ /*
+ * I/O resources
+ */
+
+ fb_pgbase = round_down(fb_base, PAGE_SIZE);
+ fb_pgsize = fb_base - fb_pgbase + round_up(fb_size, PAGE_SIZE);
+
+ ret = devm_aperture_acquire_from_firmware(dev, fb_pgbase, fb_pgsize);
+ if (ret) {
+ drm_err(dev, "could not acquire memory range %pr: error %d\n", &res, ret);
+ return ERR_PTR(ret);
+ }
+
+ mem = devm_request_mem_region(&pdev->dev, fb_pgbase, fb_pgsize, drv->name);
+ if (!mem) {
+ drm_warn(dev, "could not acquire memory region %pr\n", &res);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ screen_base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
+ if (!screen_base)
+ return ERR_PTR(-ENOMEM);
+ iosys_map_set_vaddr_iomem(&odev->screen_base, screen_base);
+
+ /*
+ * Firmware framebuffer
+ */
+
+ odev->mode = ofdrm_mode(width, height);
+ odev->format = format;
+ odev->pitch = linebytes;
+
+ /*
+ * Mode-setting pipeline
+ */
+
+ ret = drmm_mode_config_init(dev);
+ if (ret)
+ return ERR_PTR(ret);
+
+ max_width = max_t(unsigned long, width, DRM_SHADOW_PLANE_MAX_WIDTH);
+ max_height = max_t(unsigned long, height, DRM_SHADOW_PLANE_MAX_HEIGHT);
+
+ dev->mode_config.min_width = width;
+ dev->mode_config.max_width = max_width;
+ dev->mode_config.min_height = height;
+ dev->mode_config.max_height = max_height;
+ dev->mode_config.preferred_depth = format->cpp[0] * 8;
+ dev->mode_config.funcs = &ofdrm_mode_config_funcs;
+
+ /* Primary plane */
+
+ nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
+ ofdrm_primary_plane_formats,
+ ARRAY_SIZE(ofdrm_primary_plane_formats),
+ odev->formats, ARRAY_SIZE(odev->formats));
+
+ primary_plane = &odev->primary_plane;
+ ret = drm_universal_plane_init(dev, primary_plane, 0, &ofdrm_primary_plane_funcs,
+ odev->formats, nformats,
+ ofdrm_primary_plane_format_modifiers,
+ DRM_PLANE_TYPE_PRIMARY, NULL);
+ if (ret)
+ return ERR_PTR(ret);
+ drm_plane_helper_add(primary_plane, &ofdrm_primary_plane_helper_funcs);
+ drm_plane_enable_fb_damage_clips(primary_plane);
+
+ /* CRTC */
+
+ crtc = &odev->crtc;
+ ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
+ &ofdrm_crtc_funcs, NULL);
+ if (ret)
+ return ERR_PTR(ret);
+ drm_crtc_helper_add(crtc, &ofdrm_crtc_helper_funcs);
+
+ /* Encoder */
+
+ encoder = &odev->encoder;
+ ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_NONE);
+ if (ret)
+ return ERR_PTR(ret);
+ encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+ /* Connector */
+
+ connector = &odev->connector;
+ ret = drm_connector_init(dev, connector, &ofdrm_connector_funcs,
+ DRM_MODE_CONNECTOR_Unknown);
+ if (ret)
+ return ERR_PTR(ret);
+ drm_connector_helper_add(connector, &ofdrm_connector_helper_funcs);
+ drm_connector_set_panel_orientation_with_quirk(connector,
+ DRM_MODE_PANEL_ORIENTATION_UNKNOWN,
+ width, height);
+
+ ret = drm_connector_attach_encoder(connector, encoder);
+ if (ret)
+ return ERR_PTR(ret);
+
+ drm_mode_config_reset(dev);
+
+ return odev;
+}
+
+/*
+ * DRM driver
+ */
+
+DEFINE_DRM_GEM_FOPS(ofdrm_fops);
+
+static struct drm_driver ofdrm_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 = &ofdrm_fops,
+};
+
+/*
+ * Platform driver
+ */
+
+static int ofdrm_probe(struct platform_device *pdev)
+{
+ struct ofdrm_device *odev;
+ struct drm_device *dev;
+ int ret;
+
+ odev = ofdrm_device_create(&ofdrm_driver, pdev);
+ if (IS_ERR(odev))
+ return PTR_ERR(odev);
+ dev = &odev->dev;
+
+ ret = drm_dev_register(dev, 0);
+ if (ret)
+ return ret;
+
+ drm_fbdev_generic_setup(dev, 0);
+
+ return 0;
+}
+
+static int ofdrm_remove(struct platform_device *pdev)
+{
+ struct drm_device *dev = platform_get_drvdata(pdev);
+
+ drm_dev_unplug(dev);
+
+ return 0;
+}
+
+static const struct of_device_id ofdrm_of_match_display[] = {
+ { .compatible = "display", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, ofdrm_of_match_display);
+
+static struct platform_driver ofdrm_platform_driver = {
+ .driver = {
+ .name = "of-display",
+ .of_match_table = ofdrm_of_match_display,
+ },
+ .probe = ofdrm_probe,
+ .remove = ofdrm_remove,
+};
+
+module_platform_driver(ofdrm_platform_driver);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index cfc55273dc5d..a98987aa2784 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -455,6 +455,7 @@ config FB_ATARI
config FB_OF
bool "Open Firmware frame buffer device support"
depends on (FB = y) && PPC && (!PPC_PSERIES || PCI)
+ depends on !DRM_OFDRM
select APERTURE_HELPERS
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
--
2.37.3
^ permalink raw reply related [flat|nested] 9+ messages in thread* Re: [PATCH v3 1/4] drm/ofdrm: Add ofdrm for Open Firmware framebuffers
2022-09-22 11:33 ` [PATCH v3 1/4] drm/ofdrm: Add ofdrm for Open Firmware framebuffers Thomas Zimmermann
@ 2022-09-23 7:14 ` Geert Uytterhoeven
2022-09-23 7:41 ` Thomas Zimmermann
2022-09-27 15:33 ` Thomas Zimmermann
0 siblings, 2 replies; 9+ messages in thread
From: Geert Uytterhoeven @ 2022-09-23 7:14 UTC (permalink / raw)
To: Thomas Zimmermann
Cc: linux-fbdev, airlied, deller, linuxppc-dev, mark.cave-ayland,
javierm, dri-devel, paulus, maxime, daniel, msuchanek, sam
Hi Thomas,
On Thu, Sep 22, 2022 at 1:33 PM Thomas Zimmermann <tzimmermann@suse.de> wrote:
> Open Firmware provides basic display output via the 'display' node.
> DT platform code already provides a device that represents the node's
> framebuffer. Add a DRM driver for the device. The display mode and
> color format is pre-initialized by the system's firmware. Runtime
> modesetting via DRM is not possible. The display is useful during
> early boot stages or as error fallback.
>
> Similar functionality is already provided by fbdev's offb driver,
> which is insufficient for modern userspace. The old driver includes
> support for BootX device tree, which can be found on old 32-bit
> PowerPC Macintosh systems. If these are still in use, the
> functionality can be added to ofdrm or implemented in a new
> driver. As with simpledrm, the fbdev driver cannot be selected if
> ofdrm is already enabled.
Thanks for your patch!
> The driver has been tested on qemu's ppc64le emulation. The device
> hand-over has been tested with bochs.
Oh, tested on little-endian only ;-)
> --- /dev/null
> +++ b/drivers/gpu/drm/tiny/ofdrm.c
> +static const struct drm_format_info *display_get_validated_format(struct drm_device *dev,
> + u32 depth)
> +{
> + const struct drm_format_info *info;
> + u32 format;
> +
> + switch (depth) {
> + case 8:
> + format = drm_mode_legacy_fb_format(8, 8);
> + break;
> + case 15:
> + case 16:
> + format = drm_mode_legacy_fb_format(16, depth);
> + break;
> + case 32:
> + format = drm_mode_legacy_fb_format(32, 24);
Shouldn't all of these use drm_driver_legacy_fb_format() (and the
driver set drm_mode_config.quirk_addfb_prefer_host_byte_order) to have
a chance of working on traditional big-endian PPC?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: [PATCH v3 1/4] drm/ofdrm: Add ofdrm for Open Firmware framebuffers
2022-09-23 7:14 ` Geert Uytterhoeven
@ 2022-09-23 7:41 ` Thomas Zimmermann
2022-09-27 15:33 ` Thomas Zimmermann
1 sibling, 0 replies; 9+ messages in thread
From: Thomas Zimmermann @ 2022-09-23 7:41 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: linux-fbdev, airlied, deller, linuxppc-dev, mark.cave-ayland,
javierm, dri-devel, paulus, maxime, daniel, msuchanek, sam
[-- Attachment #1.1: Type: text/plain, Size: 3227 bytes --]
Hi Geert
Am 23.09.22 um 09:14 schrieb Geert Uytterhoeven:
> Hi Thomas,
>
> On Thu, Sep 22, 2022 at 1:33 PM Thomas Zimmermann <tzimmermann@suse.de> wrote:
>> Open Firmware provides basic display output via the 'display' node.
>> DT platform code already provides a device that represents the node's
>> framebuffer. Add a DRM driver for the device. The display mode and
>> color format is pre-initialized by the system's firmware. Runtime
>> modesetting via DRM is not possible. The display is useful during
>> early boot stages or as error fallback.
>>
>> Similar functionality is already provided by fbdev's offb driver,
>> which is insufficient for modern userspace. The old driver includes
>> support for BootX device tree, which can be found on old 32-bit
>> PowerPC Macintosh systems. If these are still in use, the
>> functionality can be added to ofdrm or implemented in a new
>> driver. As with simpledrm, the fbdev driver cannot be selected if
>> ofdrm is already enabled.
>
> Thanks for your patch!
>
>> The driver has been tested on qemu's ppc64le emulation. The device
>> hand-over has been tested with bochs.
>
> Oh, tested on little-endian only ;-)
I wish it was easier to test. But it's hard to find hardware and a Linux
for PowerPC these days, so I have limited options for testing. It's just
qemu + a compatible distribution for me. My assumption has been that
people who what to use it on anything else would send me a patch.
>
>> --- /dev/null
>> +++ b/drivers/gpu/drm/tiny/ofdrm.c
>> +static const struct drm_format_info *display_get_validated_format(struct drm_device *dev,
>> + u32 depth)
>> +{
>> + const struct drm_format_info *info;
>> + u32 format;
>> +
>> + switch (depth) {
>> + case 8:
>> + format = drm_mode_legacy_fb_format(8, 8);
>> + break;
>> + case 15:
>> + case 16:
>> + format = drm_mode_legacy_fb_format(16, depth);
>> + break;
>> + case 32:
>> + format = drm_mode_legacy_fb_format(32, 24);
>
> Shouldn't all of these use drm_driver_legacy_fb_format() (and the
> driver set drm_mode_config.quirk_addfb_prefer_host_byte_order) to have
> a chance of working on traditional big-endian PPC?
That's a good point. The offb driver reads the endianess property. Ofdrm
could do this and set the quirk bit accordingly. I won't have the option
to test it, but the code seems easy enough to add it. I'll make an extra
patch for this in the next iteration.
Best regards
Thomas
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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^ permalink raw reply [flat|nested] 9+ messages in thread* Re: [PATCH v3 1/4] drm/ofdrm: Add ofdrm for Open Firmware framebuffers
2022-09-23 7:14 ` Geert Uytterhoeven
2022-09-23 7:41 ` Thomas Zimmermann
@ 2022-09-27 15:33 ` Thomas Zimmermann
1 sibling, 0 replies; 9+ messages in thread
From: Thomas Zimmermann @ 2022-09-27 15:33 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: linux-fbdev, sam, airlied, deller, mark.cave-ayland, javierm,
dri-devel, paulus, maxime, msuchanek, linuxppc-dev
[-- Attachment #1.1: Type: text/plain, Size: 2978 bytes --]
Hi
Am 23.09.22 um 09:14 schrieb Geert Uytterhoeven:
> Hi Thomas,
>
> On Thu, Sep 22, 2022 at 1:33 PM Thomas Zimmermann <tzimmermann@suse.de> wrote:
>> Open Firmware provides basic display output via the 'display' node.
>> DT platform code already provides a device that represents the node's
>> framebuffer. Add a DRM driver for the device. The display mode and
>> color format is pre-initialized by the system's firmware. Runtime
>> modesetting via DRM is not possible. The display is useful during
>> early boot stages or as error fallback.
>>
>> Similar functionality is already provided by fbdev's offb driver,
>> which is insufficient for modern userspace. The old driver includes
>> support for BootX device tree, which can be found on old 32-bit
>> PowerPC Macintosh systems. If these are still in use, the
>> functionality can be added to ofdrm or implemented in a new
>> driver. As with simpledrm, the fbdev driver cannot be selected if
>> ofdrm is already enabled.
>
> Thanks for your patch!
>
>> The driver has been tested on qemu's ppc64le emulation. The device
>> hand-over has been tested with bochs.
>
> Oh, tested on little-endian only ;-)
>
>> --- /dev/null
>> +++ b/drivers/gpu/drm/tiny/ofdrm.c
>> +static const struct drm_format_info *display_get_validated_format(struct drm_device *dev,
>> + u32 depth)
>> +{
>> + const struct drm_format_info *info;
>> + u32 format;
>> +
>> + switch (depth) {
>> + case 8:
>> + format = drm_mode_legacy_fb_format(8, 8);
>> + break;
>> + case 15:
>> + case 16:
>> + format = drm_mode_legacy_fb_format(16, depth);
>> + break;
>> + case 32:
>> + format = drm_mode_legacy_fb_format(32, 24);
>
> Shouldn't all of these use drm_driver_legacy_fb_format() (and the
> driver set drm_mode_config.quirk_addfb_prefer_host_byte_order) to have
> a chance of working on traditional big-endian PPC?
Big thanks to Michal Suchanek, who pointed me to a Tumbleweed installer
for big-endian PPC64. I've added code to support BE scanout buffers.
I'll add the patch to the next iteration. But Userspace isn't really
ready yet. Pixman mostly works on my test system, but GL rendering
displays incorrect colors.
Best regards
Thomas
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 840 bytes --]
^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v3 2/4] drm/ofdrm: Add CRTC state
2022-09-22 11:33 [PATCH v3 0/4] drm: Add driver for PowerPC OF displays Thomas Zimmermann
2022-09-22 11:33 ` [PATCH v3 1/4] drm/ofdrm: Add ofdrm for Open Firmware framebuffers Thomas Zimmermann
@ 2022-09-22 11:33 ` Thomas Zimmermann
2022-09-22 11:33 ` [PATCH v3 3/4] drm/ofdrm: Add per-model device function Thomas Zimmermann
2022-09-22 11:33 ` [PATCH v3 4/4] drm/ofdrm: Support color management Thomas Zimmermann
3 siblings, 0 replies; 9+ messages in thread
From: Thomas Zimmermann @ 2022-09-22 11:33 UTC (permalink / raw)
To: javierm, airlied, daniel, deller, maxime, sam, msuchanek, mpe,
benh, paulus, geert, mark.cave-ayland
Cc: linux-fbdev, linuxppc-dev, Thomas Zimmermann, dri-devel
Add a dedicated CRTC state to ofdrm to later store information for
palette updates.
v3:
* rework CRTC state helpers (Javier)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
---
drivers/gpu/drm/tiny/ofdrm.c | 59 ++++++++++++++++++++++++++++++++++--
1 file changed, 56 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/tiny/ofdrm.c b/drivers/gpu/drm/tiny/ofdrm.c
index 5ac9aa769513..a78aee800956 100644
--- a/drivers/gpu/drm/tiny/ofdrm.c
+++ b/drivers/gpu/drm/tiny/ofdrm.c
@@ -279,6 +279,21 @@ static struct resource *ofdrm_find_fb_resource(struct ofdrm_device *odev,
* Modesetting
*/
+struct ofdrm_crtc_state {
+ struct drm_crtc_state base;
+};
+
+static struct ofdrm_crtc_state *to_ofdrm_crtc_state(struct drm_crtc_state *base)
+{
+ return container_of(base, struct ofdrm_crtc_state, base);
+}
+
+static void ofdrm_crtc_state_destroy(struct ofdrm_crtc_state *ofdrm_crtc_state)
+{
+ __drm_atomic_helper_crtc_destroy_state(&ofdrm_crtc_state->base);
+ kfree(ofdrm_crtc_state);
+}
+
/*
* Support all formats of OF display and maybe more; in order
* of preference. The display's update function will do any
@@ -429,13 +444,51 @@ static const struct drm_crtc_helper_funcs ofdrm_crtc_helper_funcs = {
.atomic_check = ofdrm_crtc_helper_atomic_check,
};
+static void ofdrm_crtc_reset(struct drm_crtc *crtc)
+{
+ struct ofdrm_crtc_state *ofdrm_crtc_state =
+ kzalloc(sizeof(*ofdrm_crtc_state), GFP_KERNEL);
+
+ if (crtc->state)
+ ofdrm_crtc_state_destroy(to_ofdrm_crtc_state(crtc->state));
+
+ if (ofdrm_crtc_state)
+ __drm_atomic_helper_crtc_reset(crtc, &ofdrm_crtc_state->base);
+ else
+ __drm_atomic_helper_crtc_reset(crtc, NULL);
+}
+
+static struct drm_crtc_state *ofdrm_crtc_atomic_duplicate_state(struct drm_crtc *crtc)
+{
+ struct drm_device *dev = crtc->dev;
+ struct drm_crtc_state *crtc_state = crtc->state;
+ struct ofdrm_crtc_state *new_ofdrm_crtc_state;
+
+ if (drm_WARN_ON(dev, !crtc_state))
+ return NULL;
+
+ new_ofdrm_crtc_state = kzalloc(sizeof(*new_ofdrm_crtc_state), GFP_KERNEL);
+ if (!new_ofdrm_crtc_state)
+ return NULL;
+
+ __drm_atomic_helper_crtc_duplicate_state(crtc, &new_ofdrm_crtc_state->base);
+
+ return &new_ofdrm_crtc_state->base;
+}
+
+static void ofdrm_crtc_atomic_destroy_state(struct drm_crtc *crtc,
+ struct drm_crtc_state *crtc_state)
+{
+ ofdrm_crtc_state_destroy(to_ofdrm_crtc_state(crtc_state));
+}
+
static const struct drm_crtc_funcs ofdrm_crtc_funcs = {
- .reset = drm_atomic_helper_crtc_reset,
+ .reset = ofdrm_crtc_reset,
.destroy = drm_crtc_cleanup,
.set_config = drm_atomic_helper_set_config,
.page_flip = drm_atomic_helper_page_flip,
- .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
- .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+ .atomic_duplicate_state = ofdrm_crtc_atomic_duplicate_state,
+ .atomic_destroy_state = ofdrm_crtc_atomic_destroy_state,
};
static int ofdrm_connector_helper_get_modes(struct drm_connector *connector)
--
2.37.3
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH v3 3/4] drm/ofdrm: Add per-model device function
2022-09-22 11:33 [PATCH v3 0/4] drm: Add driver for PowerPC OF displays Thomas Zimmermann
2022-09-22 11:33 ` [PATCH v3 1/4] drm/ofdrm: Add ofdrm for Open Firmware framebuffers Thomas Zimmermann
2022-09-22 11:33 ` [PATCH v3 2/4] drm/ofdrm: Add CRTC state Thomas Zimmermann
@ 2022-09-22 11:33 ` Thomas Zimmermann
2022-09-22 11:33 ` [PATCH v3 4/4] drm/ofdrm: Support color management Thomas Zimmermann
3 siblings, 0 replies; 9+ messages in thread
From: Thomas Zimmermann @ 2022-09-22 11:33 UTC (permalink / raw)
To: javierm, airlied, daniel, deller, maxime, sam, msuchanek, mpe,
benh, paulus, geert, mark.cave-ayland
Cc: linux-fbdev, linuxppc-dev, Thomas Zimmermann, dri-devel
Add a per-model device-function structure in preparation of adding
color-management support. Detection of the individual models has been
taken from fbdev's offb.
v3:
* define constants for PCI ids (Javier)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
---
drivers/gpu/drm/tiny/ofdrm.c | 125 +++++++++++++++++++++++++++++++++++
1 file changed, 125 insertions(+)
diff --git a/drivers/gpu/drm/tiny/ofdrm.c b/drivers/gpu/drm/tiny/ofdrm.c
index a78aee800956..9a8e5696999c 100644
--- a/drivers/gpu/drm/tiny/ofdrm.c
+++ b/drivers/gpu/drm/tiny/ofdrm.c
@@ -28,6 +28,21 @@
#define DRIVER_MAJOR 1
#define DRIVER_MINOR 0
+#define PCI_VENDOR_ID_ATI_R520 0x7100
+#define PCI_VENDOR_ID_ATI_R600 0x9400
+
+enum ofdrm_model {
+ OFDRM_MODEL_UNKNOWN,
+ OFDRM_MODEL_MACH64, /* ATI Mach64 */
+ OFDRM_MODEL_RAGE128, /* ATI Rage128 */
+ OFDRM_MODEL_RAGE_M3A, /* ATI Rage Mobility M3 Head A */
+ OFDRM_MODEL_RAGE_M3B, /* ATI Rage Mobility M3 Head B */
+ OFDRM_MODEL_RADEON, /* ATI Radeon */
+ OFDRM_MODEL_GXT2000, /* IBM GXT2000 */
+ OFDRM_MODEL_AVIVO, /* ATI R5xx */
+ OFDRM_MODEL_QEMU, /* QEMU VGA */
+};
+
/*
* Helpers for display nodes
*/
@@ -149,14 +164,63 @@ static u64 display_get_address_of(struct drm_device *dev, struct device_node *of
return address;
}
+static bool is_avivo(__be32 vendor, __be32 device)
+{
+ /* This will match most R5xx */
+ return (vendor == PCI_VENDOR_ID_ATI) &&
+ ((device >= PCI_VENDOR_ID_ATI_R520 && device < 0x7800) ||
+ (PCI_VENDOR_ID_ATI_R600 >= 0x9400));
+}
+
+static enum ofdrm_model display_get_model_of(struct drm_device *dev, struct device_node *of_node)
+{
+ enum ofdrm_model model = OFDRM_MODEL_UNKNOWN;
+
+ if (of_node_name_prefix(of_node, "ATY,Rage128")) {
+ model = OFDRM_MODEL_RAGE128;
+ } else if (of_node_name_prefix(of_node, "ATY,RageM3pA") ||
+ of_node_name_prefix(of_node, "ATY,RageM3p12A")) {
+ model = OFDRM_MODEL_RAGE_M3A;
+ } else if (of_node_name_prefix(of_node, "ATY,RageM3pB")) {
+ model = OFDRM_MODEL_RAGE_M3B;
+ } else if (of_node_name_prefix(of_node, "ATY,Rage6")) {
+ model = OFDRM_MODEL_RADEON;
+ } else if (of_node_name_prefix(of_node, "ATY,")) {
+ return OFDRM_MODEL_MACH64;
+ } else if (of_device_is_compatible(of_node, "pci1014,b7") ||
+ of_device_is_compatible(of_node, "pci1014,21c")) {
+ model = OFDRM_MODEL_GXT2000;
+ } else if (of_node_name_prefix(of_node, "vga,Display-")) {
+ struct device_node *of_parent;
+ const __be32 *vendor_p, *device_p;
+
+ /* Look for AVIVO initialized by SLOF */
+ of_parent = of_get_parent(of_node);
+ vendor_p = of_get_property(of_parent, "vendor-id", NULL);
+ device_p = of_get_property(of_parent, "device-id", NULL);
+ if (vendor_p && device_p && is_avivo(*vendor_p, *device_p))
+ model = OFDRM_MODEL_AVIVO;
+ of_node_put(of_parent);
+ } else if (of_device_is_compatible(of_node, "qemu,std-vga")) {
+ model = OFDRM_MODEL_QEMU;
+ }
+
+ return model;
+}
+
/*
* Open Firmware display device
*/
+struct ofdrm_device_funcs {
+};
+
struct ofdrm_device {
struct drm_device dev;
struct platform_device *pdev;
+ const struct ofdrm_device_funcs *funcs;
+
/* simplefb settings */
struct iosys_map screen_base;
struct drm_display_mode mode;
@@ -520,6 +584,33 @@ static const struct drm_mode_config_funcs ofdrm_mode_config_funcs = {
* Init / Cleanup
*/
+static const struct ofdrm_device_funcs ofdrm_unknown_device_funcs = {
+};
+
+static const struct ofdrm_device_funcs ofdrm_mach64_device_funcs = {
+};
+
+static const struct ofdrm_device_funcs ofdrm_rage128_device_funcs = {
+};
+
+static const struct ofdrm_device_funcs ofdrm_rage_m3a_device_funcs = {
+};
+
+static const struct ofdrm_device_funcs ofdrm_rage_m3b_device_funcs = {
+};
+
+static const struct ofdrm_device_funcs ofdrm_radeon_device_funcs = {
+};
+
+static const struct ofdrm_device_funcs ofdrm_gxt2000_device_funcs = {
+};
+
+static const struct ofdrm_device_funcs ofdrm_avivo_device_funcs = {
+};
+
+static const struct ofdrm_device_funcs ofdrm_qemu_device_funcs = {
+};
+
static struct drm_display_mode ofdrm_mode(unsigned int width, unsigned int height)
{
/*
@@ -541,6 +632,7 @@ static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
struct device_node *of_node = pdev->dev.of_node;
struct ofdrm_device *odev;
struct drm_device *dev;
+ enum ofdrm_model model;
int width, height, linebytes;
const struct drm_format_info *format;
u64 address;
@@ -569,6 +661,39 @@ static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
* OF display-node settings
*/
+ model = display_get_model_of(dev, of_node);
+ drm_dbg(dev, "detected model %d\n", model);
+
+ switch (model) {
+ case OFDRM_MODEL_UNKNOWN:
+ odev->funcs = &ofdrm_unknown_device_funcs;
+ break;
+ case OFDRM_MODEL_MACH64:
+ odev->funcs = &ofdrm_mach64_device_funcs;
+ break;
+ case OFDRM_MODEL_RAGE128:
+ odev->funcs = &ofdrm_rage128_device_funcs;
+ break;
+ case OFDRM_MODEL_RAGE_M3A:
+ odev->funcs = &ofdrm_rage_m3a_device_funcs;
+ break;
+ case OFDRM_MODEL_RAGE_M3B:
+ odev->funcs = &ofdrm_rage_m3b_device_funcs;
+ break;
+ case OFDRM_MODEL_RADEON:
+ odev->funcs = &ofdrm_radeon_device_funcs;
+ break;
+ case OFDRM_MODEL_GXT2000:
+ odev->funcs = &ofdrm_gxt2000_device_funcs;
+ break;
+ case OFDRM_MODEL_AVIVO:
+ odev->funcs = &ofdrm_avivo_device_funcs;
+ break;
+ case OFDRM_MODEL_QEMU:
+ odev->funcs = &ofdrm_qemu_device_funcs;
+ break;
+ }
+
width = display_get_width_of(dev, of_node);
if (width < 0)
return ERR_PTR(width);
--
2.37.3
^ permalink raw reply related [flat|nested] 9+ messages in thread* [PATCH v3 4/4] drm/ofdrm: Support color management
2022-09-22 11:33 [PATCH v3 0/4] drm: Add driver for PowerPC OF displays Thomas Zimmermann
` (2 preceding siblings ...)
2022-09-22 11:33 ` [PATCH v3 3/4] drm/ofdrm: Add per-model device function Thomas Zimmermann
@ 2022-09-22 11:33 ` Thomas Zimmermann
2022-09-23 7:18 ` Geert Uytterhoeven
3 siblings, 1 reply; 9+ messages in thread
From: Thomas Zimmermann @ 2022-09-22 11:33 UTC (permalink / raw)
To: javierm, airlied, daniel, deller, maxime, sam, msuchanek, mpe,
benh, paulus, geert, mark.cave-ayland
Cc: linux-fbdev, linuxppc-dev, Thomas Zimmermann, dri-devel
Support the CRTC's color-management property and implement each model's
palette support.
The OF hardware has different methods of setting the palette. The
respective code has been taken from fbdev's offb and refactored into
per-model device functions. The device functions integrate this
functionality into the overall modesetting.
As palette handling is a CRTC property that depends on the primary
plane's color format, the plane's atomic_check helper now updates the
format field in ofdrm's custom CRTC state. The CRTC's atomic_flush
helper updates the palette for the format as needed.
v3:
* lookup CRTC state with drm_atomic_get_new_crtc_state()
* access HW palette with writeb(), writel(), and readl() (Ben)
* declare register values as u32
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
---
drivers/gpu/drm/tiny/ofdrm.c | 442 ++++++++++++++++++++++++++++++++++-
1 file changed, 437 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/tiny/ofdrm.c b/drivers/gpu/drm/tiny/ofdrm.c
index 9a8e5696999c..f891588375e7 100644
--- a/drivers/gpu/drm/tiny/ofdrm.c
+++ b/drivers/gpu/drm/tiny/ofdrm.c
@@ -13,6 +13,7 @@
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_format_helper.h>
+#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_gem_shmem_helper.h>
@@ -31,6 +32,33 @@
#define PCI_VENDOR_ID_ATI_R520 0x7100
#define PCI_VENDOR_ID_ATI_R600 0x9400
+#define OFDRM_GAMMA_LUT_SIZE 256
+
+/* Definitions used by the Avivo palette */
+#define AVIVO_DC_LUT_RW_SELECT 0x6480
+#define AVIVO_DC_LUT_RW_MODE 0x6484
+#define AVIVO_DC_LUT_RW_INDEX 0x6488
+#define AVIVO_DC_LUT_SEQ_COLOR 0x648c
+#define AVIVO_DC_LUT_PWL_DATA 0x6490
+#define AVIVO_DC_LUT_30_COLOR 0x6494
+#define AVIVO_DC_LUT_READ_PIPE_SELECT 0x6498
+#define AVIVO_DC_LUT_WRITE_EN_MASK 0x649c
+#define AVIVO_DC_LUT_AUTOFILL 0x64a0
+#define AVIVO_DC_LUTA_CONTROL 0x64c0
+#define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE 0x64c4
+#define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN 0x64c8
+#define AVIVO_DC_LUTA_BLACK_OFFSET_RED 0x64cc
+#define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE 0x64d0
+#define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN 0x64d4
+#define AVIVO_DC_LUTA_WHITE_OFFSET_RED 0x64d8
+#define AVIVO_DC_LUTB_CONTROL 0x6cc0
+#define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE 0x6cc4
+#define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN 0x6cc8
+#define AVIVO_DC_LUTB_BLACK_OFFSET_RED 0x6ccc
+#define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE 0x6cd0
+#define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN 0x6cd4
+#define AVIVO_DC_LUTB_WHITE_OFFSET_RED 0x6cd8
+
enum ofdrm_model {
OFDRM_MODEL_UNKNOWN,
OFDRM_MODEL_MACH64, /* ATI Mach64 */
@@ -212,7 +240,14 @@ static enum ofdrm_model display_get_model_of(struct drm_device *dev, struct devi
* Open Firmware display device
*/
+struct ofdrm_device;
+
struct ofdrm_device_funcs {
+ void __iomem *(*cmap_ioremap)(struct ofdrm_device *odev,
+ struct device_node *of_node,
+ u64 fb_bas);
+ void (*cmap_write)(struct ofdrm_device *odev, unsigned char index,
+ unsigned char r, unsigned char g, unsigned char b);
};
struct ofdrm_device {
@@ -227,6 +262,9 @@ struct ofdrm_device {
const struct drm_format_info *format;
unsigned int pitch;
+ /* colormap */
+ void __iomem *cmap_base;
+
/* modesetting */
uint32_t formats[8];
struct drm_plane primary_plane;
@@ -339,12 +377,322 @@ static struct resource *ofdrm_find_fb_resource(struct ofdrm_device *odev,
return max_res;
}
+/*
+ * Colormap / Palette
+ */
+
+static void __iomem *get_cmap_address_of(struct ofdrm_device *odev, struct device_node *of_node,
+ int bar_no, unsigned long offset, unsigned long size)
+{
+ struct drm_device *dev = &odev->dev;
+ const __be32 *addr_p;
+ u64 max_size, address;
+ unsigned int flags;
+ void __iomem *mem;
+
+ addr_p = of_get_pci_address(of_node, bar_no, &max_size, &flags);
+ if (!addr_p)
+ addr_p = of_get_address(of_node, bar_no, &max_size, &flags);
+ if (!addr_p)
+ return ERR_PTR(-ENODEV);
+
+ if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
+ return ERR_PTR(-ENODEV);
+
+ if ((offset + size) >= max_size)
+ return ERR_PTR(-ENODEV);
+
+ address = of_translate_address(of_node, addr_p);
+ if (address == OF_BAD_ADDR)
+ return ERR_PTR(-ENODEV);
+
+ mem = devm_ioremap(dev->dev, address + offset, size);
+ if (!mem)
+ return ERR_PTR(-ENOMEM);
+
+ return mem;
+}
+
+static void __iomem *ofdrm_mach64_cmap_ioremap(struct ofdrm_device *odev,
+ struct device_node *of_node,
+ u64 fb_base)
+{
+ struct drm_device *dev = &odev->dev;
+ u64 address;
+ void __iomem *cmap_base;
+
+ address = fb_base & 0xff000000ul;
+ address += 0x7ff000;
+
+ cmap_base = devm_ioremap(dev->dev, address, 0x1000);
+ if (!cmap_base)
+ return ERR_PTR(-ENOMEM);
+
+ return cmap_base;
+}
+
+static void ofdrm_mach64_cmap_write(struct ofdrm_device *odev, unsigned char index,
+ unsigned char r, unsigned char g, unsigned char b)
+{
+ void __iomem *addr = odev->cmap_base + 0xcc0;
+ void __iomem *data = odev->cmap_base + 0xcc0 + 1;
+
+ writeb(index, addr);
+ writeb(r, data);
+ writeb(g, data);
+ writeb(b, data);
+}
+
+static void __iomem *ofdrm_rage128_cmap_ioremap(struct ofdrm_device *odev,
+ struct device_node *of_node,
+ u64 fb_base)
+{
+ return get_cmap_address_of(odev, of_node, 2, 0, 0x1fff);
+}
+
+static void ofdrm_rage128_cmap_write(struct ofdrm_device *odev, unsigned char index,
+ unsigned char r, unsigned char g, unsigned char b)
+{
+ void __iomem *addr = odev->cmap_base + 0xb0;
+ void __iomem *data = odev->cmap_base + 0xb4;
+ u32 color = (r << 16) | (g << 8) | b;
+
+ writeb(index, addr);
+ writel(color, data);
+}
+
+static void __iomem *ofdrm_rage_m3a_cmap_ioremap(struct ofdrm_device *odev,
+ struct device_node *of_node,
+ u64 fb_base)
+{
+ return get_cmap_address_of(odev, of_node, 2, 0, 0x1fff);
+}
+
+static void ofdrm_rage_m3a_cmap_write(struct ofdrm_device *odev, unsigned char index,
+ unsigned char r, unsigned char g, unsigned char b)
+{
+ void __iomem *dac_ctl = odev->cmap_base + 0x58;
+ void __iomem *addr = odev->cmap_base + 0xb0;
+ void __iomem *data = odev->cmap_base + 0xb4;
+ u32 color = (r << 16) | (g << 8) | b;
+ u32 val;
+
+ /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
+ val = readl(dac_ctl);
+ val &= ~0x20;
+ writel(val, dac_ctl);
+
+ /* Set color at palette index */
+ writeb(index, addr);
+ writel(color, data);
+}
+
+static void __iomem *ofdrm_rage_m3b_cmap_ioremap(struct ofdrm_device *odev,
+ struct device_node *of_node,
+ u64 fb_base)
+{
+ return get_cmap_address_of(odev, of_node, 2, 0, 0x1fff);
+}
+
+static void ofdrm_rage_m3b_cmap_write(struct ofdrm_device *odev, unsigned char index,
+ unsigned char r, unsigned char g, unsigned char b)
+{
+ void __iomem *dac_ctl = odev->cmap_base + 0x58;
+ void __iomem *addr = odev->cmap_base + 0xb0;
+ void __iomem *data = odev->cmap_base + 0xb4;
+ u32 color = (r << 16) | (g << 8) | b;
+ u32 val;
+
+ /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
+ val = readl(dac_ctl);
+ val |= 0x20;
+ writel(val, dac_ctl);
+
+ /* Set color at palette index */
+ writeb(index, addr);
+ writel(color, data);
+}
+
+static void __iomem *ofdrm_radeon_cmap_ioremap(struct ofdrm_device *odev,
+ struct device_node *of_node,
+ u64 fb_base)
+{
+ return get_cmap_address_of(odev, of_node, 1, 0, 0x1fff);
+}
+
+static void __iomem *ofdrm_gxt2000_cmap_ioremap(struct ofdrm_device *odev,
+ struct device_node *of_node,
+ u64 fb_base)
+{
+ return get_cmap_address_of(odev, of_node, 0, 0x6000, 0x1000);
+}
+
+static void ofdrm_gxt2000_cmap_write(struct ofdrm_device *odev, unsigned char index,
+ unsigned char r, unsigned char g, unsigned char b)
+{
+ void __iomem *data = ((unsigned int __iomem *)odev->cmap_base) + index;
+ u32 color = (r << 16) | (g << 8) | b;
+
+ writel(color, data);
+}
+
+static void __iomem *ofdrm_avivo_cmap_ioremap(struct ofdrm_device *odev,
+ struct device_node *of_node,
+ u64 fb_base)
+{
+ struct device_node *of_parent;
+ void __iomem *cmap_base;
+
+ of_parent = of_get_parent(of_node);
+ cmap_base = get_cmap_address_of(odev, of_parent, 0, 0, 0x10000);
+ of_node_put(of_parent);
+
+ return cmap_base;
+}
+
+static void ofdrm_avivo_cmap_write(struct ofdrm_device *odev, unsigned char index,
+ unsigned char r, unsigned char g, unsigned char b)
+{
+ void __iomem *lutsel = odev->cmap_base + AVIVO_DC_LUT_RW_SELECT;
+ void __iomem *addr = odev->cmap_base + AVIVO_DC_LUT_RW_INDEX;
+ void __iomem *data = odev->cmap_base + AVIVO_DC_LUT_30_COLOR;
+ u32 color = (r << 22) | (g << 12) | (b << 2);
+
+ /* Write to both LUTs for now */
+
+ writel(1, lutsel);
+ writeb(index, addr);
+ writel(color, data);
+
+ writel(0, lutsel);
+ writeb(index, addr);
+ writel(color, data);
+}
+
+static void __iomem *ofdrm_qemu_cmap_ioremap(struct ofdrm_device *odev,
+ struct device_node *of_node,
+ u64 fb_base)
+{
+#ifdef __BIG_ENDIAN
+ static const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
+#else
+ static const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 };
+#endif
+
+ struct drm_device *dev = &odev->dev;
+ u64 address;
+ void __iomem *cmap_base;
+
+ address = of_translate_address(of_node, io_of_addr);
+ if (address == OF_BAD_ADDR)
+ return ERR_PTR(-ENODEV);
+
+ cmap_base = devm_ioremap(dev->dev, address + 0x3c8, 2);
+ if (!cmap_base)
+ return ERR_PTR(-ENOMEM);
+
+ return cmap_base;
+}
+
+static void ofdrm_qemu_cmap_write(struct ofdrm_device *odev, unsigned char index,
+ unsigned char r, unsigned char g, unsigned char b)
+{
+ void __iomem *addr = odev->cmap_base;
+ void __iomem *data = odev->cmap_base + 1;
+
+ writeb(index, addr);
+ writeb(r, data);
+ writeb(g, data);
+ writeb(b, data);
+}
+
+static void ofdrm_device_set_gamma_linear(struct ofdrm_device *odev,
+ const struct drm_format_info *format)
+{
+ struct drm_device *dev = &odev->dev;
+ int i;
+
+ switch (format->format) {
+ case DRM_FORMAT_RGB565:
+ /* Use better interpolation, to take 32 values from 0 to 255 */
+ for (i = 0; i < OFDRM_GAMMA_LUT_SIZE / 8; i++) {
+ unsigned char r = i * 8 + i / 4;
+ unsigned char g = i * 4 + i / 16;
+ unsigned char b = i * 8 + i / 4;
+
+ odev->funcs->cmap_write(odev, i, r, g, b);
+ }
+ /* Green has one more bit, so add padding with 0 for red and blue. */
+ for (i = OFDRM_GAMMA_LUT_SIZE / 8; i < OFDRM_GAMMA_LUT_SIZE / 4; i++) {
+ unsigned char r = 0;
+ unsigned char g = i * 4 + i / 16;
+ unsigned char b = 0;
+
+ odev->funcs->cmap_write(odev, i, r, g, b);
+ }
+ break;
+ case DRM_FORMAT_XRGB8888:
+ for (i = 0; i < OFDRM_GAMMA_LUT_SIZE; i++)
+ odev->funcs->cmap_write(odev, i, i, i, i);
+ break;
+ default:
+ drm_warn_once(dev, "Unsupported format %p4cc for gamma correction\n",
+ &format->format);
+ break;
+ }
+}
+
+static void ofdrm_device_set_gamma(struct ofdrm_device *odev,
+ const struct drm_format_info *format,
+ struct drm_color_lut *lut)
+{
+ struct drm_device *dev = &odev->dev;
+ int i;
+
+ switch (format->format) {
+ case DRM_FORMAT_RGB565:
+ /* Use better interpolation, to take 32 values from lut[0] to lut[255] */
+ for (i = 0; i < OFDRM_GAMMA_LUT_SIZE / 8; i++) {
+ unsigned char r = lut[i * 8 + i / 4].red >> 8;
+ unsigned char g = lut[i * 4 + i / 16].green >> 8;
+ unsigned char b = lut[i * 8 + i / 4].blue >> 8;
+
+ odev->funcs->cmap_write(odev, i, r, g, b);
+ }
+ /* Green has one more bit, so add padding with 0 for red and blue. */
+ for (i = OFDRM_GAMMA_LUT_SIZE / 8; i < OFDRM_GAMMA_LUT_SIZE / 4; i++) {
+ unsigned char r = 0;
+ unsigned char g = lut[i * 4 + i / 16].green >> 8;
+ unsigned char b = 0;
+
+ odev->funcs->cmap_write(odev, i, r, g, b);
+ }
+ break;
+ case DRM_FORMAT_XRGB8888:
+ for (i = 0; i < OFDRM_GAMMA_LUT_SIZE; i++) {
+ unsigned char r = lut[i].red >> 8;
+ unsigned char g = lut[i].green >> 8;
+ unsigned char b = lut[i].blue >> 8;
+
+ odev->funcs->cmap_write(odev, i, r, g, b);
+ }
+ break;
+ default:
+ drm_warn_once(dev, "Unsupported format %p4cc for gamma correction\n",
+ &format->format);
+ break;
+ }
+}
+
/*
* Modesetting
*/
struct ofdrm_crtc_state {
struct drm_crtc_state base;
+
+ /* Primary-plane format; required for color mgmt. */
+ const struct drm_format_info *format;
};
static struct ofdrm_crtc_state *to_ofdrm_crtc_state(struct drm_crtc_state *base)
@@ -382,16 +730,30 @@ static int ofdrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
struct drm_atomic_state *new_state)
{
struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(new_state, plane);
+ struct drm_framebuffer *new_fb = new_plane_state->fb;
struct drm_crtc *new_crtc = new_plane_state->crtc;
struct drm_crtc_state *new_crtc_state = NULL;
+ struct ofdrm_crtc_state *new_ofdrm_crtc_state;
+ int ret;
if (new_crtc)
new_crtc_state = drm_atomic_get_new_crtc_state(new_state, new_plane_state->crtc);
- return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
- DRM_PLANE_NO_SCALING,
- DRM_PLANE_NO_SCALING,
- false, false);
+ ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
+ DRM_PLANE_NO_SCALING,
+ DRM_PLANE_NO_SCALING,
+ false, false);
+ if (ret)
+ return ret;
+ else if (!new_plane_state->visible)
+ return 0;
+
+ new_crtc_state = drm_atomic_get_new_crtc_state(new_state, new_plane_state->crtc);
+
+ new_ofdrm_crtc_state = to_ofdrm_crtc_state(new_crtc_state);
+ new_ofdrm_crtc_state->format = new_fb->format;
+
+ return 0;
}
static void ofdrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
@@ -493,9 +855,42 @@ static enum drm_mode_status ofdrm_crtc_helper_mode_valid(struct drm_crtc *crtc,
static int ofdrm_crtc_helper_atomic_check(struct drm_crtc *crtc,
struct drm_atomic_state *new_state)
{
+ static const size_t gamma_lut_length = OFDRM_GAMMA_LUT_SIZE * sizeof(struct drm_color_lut);
+
+ struct drm_device *dev = crtc->dev;
struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(new_state, crtc);
+ int ret;
+
+ ret = drm_atomic_helper_check_crtc_state(new_crtc_state, false);
+ if (ret)
+ return ret;
+
+ if (new_crtc_state->color_mgmt_changed) {
+ struct drm_property_blob *gamma_lut = new_crtc_state->gamma_lut;
- return drm_atomic_helper_check_crtc_state(new_crtc_state, false);
+ if (gamma_lut && (gamma_lut->length != gamma_lut_length)) {
+ drm_dbg(dev, "Incorrect gamma_lut length %zu\n", gamma_lut->length);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static void ofdrm_crtc_helper_atomic_flush(struct drm_crtc *crtc, struct drm_atomic_state *state)
+{
+ struct ofdrm_device *odev = ofdrm_device_of_dev(crtc->dev);
+ struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+ struct ofdrm_crtc_state *ofdrm_crtc_state = to_ofdrm_crtc_state(crtc_state);
+
+ if (crtc_state->enable && crtc_state->color_mgmt_changed) {
+ const struct drm_format_info *format = ofdrm_crtc_state->format;
+
+ if (crtc_state->gamma_lut)
+ ofdrm_device_set_gamma(odev, format, crtc_state->gamma_lut->data);
+ else
+ ofdrm_device_set_gamma_linear(odev, format);
+ }
}
/*
@@ -506,6 +901,7 @@ static int ofdrm_crtc_helper_atomic_check(struct drm_crtc *crtc,
static const struct drm_crtc_helper_funcs ofdrm_crtc_helper_funcs = {
.mode_valid = ofdrm_crtc_helper_mode_valid,
.atomic_check = ofdrm_crtc_helper_atomic_check,
+ .atomic_flush = ofdrm_crtc_helper_atomic_flush,
};
static void ofdrm_crtc_reset(struct drm_crtc *crtc)
@@ -527,6 +923,7 @@ static struct drm_crtc_state *ofdrm_crtc_atomic_duplicate_state(struct drm_crtc
struct drm_device *dev = crtc->dev;
struct drm_crtc_state *crtc_state = crtc->state;
struct ofdrm_crtc_state *new_ofdrm_crtc_state;
+ struct ofdrm_crtc_state *ofdrm_crtc_state;
if (drm_WARN_ON(dev, !crtc_state))
return NULL;
@@ -535,7 +932,10 @@ static struct drm_crtc_state *ofdrm_crtc_atomic_duplicate_state(struct drm_crtc
if (!new_ofdrm_crtc_state)
return NULL;
+ ofdrm_crtc_state = to_ofdrm_crtc_state(crtc_state);
+
__drm_atomic_helper_crtc_duplicate_state(crtc, &new_ofdrm_crtc_state->base);
+ new_ofdrm_crtc_state->format = ofdrm_crtc_state->format;
return &new_ofdrm_crtc_state->base;
}
@@ -588,27 +988,43 @@ static const struct ofdrm_device_funcs ofdrm_unknown_device_funcs = {
};
static const struct ofdrm_device_funcs ofdrm_mach64_device_funcs = {
+ .cmap_ioremap = ofdrm_mach64_cmap_ioremap,
+ .cmap_write = ofdrm_mach64_cmap_write,
};
static const struct ofdrm_device_funcs ofdrm_rage128_device_funcs = {
+ .cmap_ioremap = ofdrm_rage128_cmap_ioremap,
+ .cmap_write = ofdrm_rage128_cmap_write,
};
static const struct ofdrm_device_funcs ofdrm_rage_m3a_device_funcs = {
+ .cmap_ioremap = ofdrm_rage_m3a_cmap_ioremap,
+ .cmap_write = ofdrm_rage_m3a_cmap_write,
};
static const struct ofdrm_device_funcs ofdrm_rage_m3b_device_funcs = {
+ .cmap_ioremap = ofdrm_rage_m3b_cmap_ioremap,
+ .cmap_write = ofdrm_rage_m3b_cmap_write,
};
static const struct ofdrm_device_funcs ofdrm_radeon_device_funcs = {
+ .cmap_ioremap = ofdrm_radeon_cmap_ioremap,
+ .cmap_write = ofdrm_rage128_cmap_write, /* same as Rage128 */
};
static const struct ofdrm_device_funcs ofdrm_gxt2000_device_funcs = {
+ .cmap_ioremap = ofdrm_gxt2000_cmap_ioremap,
+ .cmap_write = ofdrm_gxt2000_cmap_write,
};
static const struct ofdrm_device_funcs ofdrm_avivo_device_funcs = {
+ .cmap_ioremap = ofdrm_avivo_cmap_ioremap,
+ .cmap_write = ofdrm_avivo_cmap_write,
};
static const struct ofdrm_device_funcs ofdrm_qemu_device_funcs = {
+ .cmap_ioremap = ofdrm_qemu_cmap_ioremap,
+ .cmap_write = ofdrm_qemu_cmap_write,
};
static struct drm_display_mode ofdrm_mode(unsigned int width, unsigned int height)
@@ -767,6 +1183,17 @@ static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
return ERR_PTR(-ENOMEM);
iosys_map_set_vaddr_iomem(&odev->screen_base, screen_base);
+ if (odev->funcs->cmap_ioremap) {
+ void __iomem *cmap_base = odev->funcs->cmap_ioremap(odev, of_node, fb_base);
+
+ if (IS_ERR(cmap_base)) {
+ /* Don't fail; continue without colormap */
+ ret = PTR_ERR(cmap_base);
+ } else {
+ odev->cmap_base = cmap_base;
+ }
+ }
+
/*
* Firmware framebuffer
*/
@@ -819,6 +1246,11 @@ static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
return ERR_PTR(ret);
drm_crtc_helper_add(crtc, &ofdrm_crtc_helper_funcs);
+ if (odev->cmap_base) {
+ drm_mode_crtc_set_gamma_size(crtc, OFDRM_GAMMA_LUT_SIZE);
+ drm_crtc_enable_color_mgmt(crtc, 0, false, OFDRM_GAMMA_LUT_SIZE);
+ }
+
/* Encoder */
encoder = &odev->encoder;
--
2.37.3
^ permalink raw reply related [flat|nested] 9+ messages in thread* Re: [PATCH v3 4/4] drm/ofdrm: Support color management
2022-09-22 11:33 ` [PATCH v3 4/4] drm/ofdrm: Support color management Thomas Zimmermann
@ 2022-09-23 7:18 ` Geert Uytterhoeven
0 siblings, 0 replies; 9+ messages in thread
From: Geert Uytterhoeven @ 2022-09-23 7:18 UTC (permalink / raw)
To: Thomas Zimmermann
Cc: linux-fbdev, airlied, deller, linuxppc-dev, mark.cave-ayland,
javierm, dri-devel, paulus, maxime, daniel, msuchanek, sam
Hi Thomas,
On Thu, Sep 22, 2022 at 1:33 PM Thomas Zimmermann <tzimmermann@suse.de> wrote:
> Support the CRTC's color-management property and implement each model's
> palette support.
>
> The OF hardware has different methods of setting the palette. The
> respective code has been taken from fbdev's offb and refactored into
> per-model device functions. The device functions integrate this
> functionality into the overall modesetting.
>
> As palette handling is a CRTC property that depends on the primary
> plane's color format, the plane's atomic_check helper now updates the
> format field in ofdrm's custom CRTC state. The CRTC's atomic_flush
> helper updates the palette for the format as needed.
>
> v3:
> * lookup CRTC state with drm_atomic_get_new_crtc_state()
> * access HW palette with writeb(), writel(), and readl() (Ben)
> * declare register values as u32
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Thanks for your patch!
> --- a/drivers/gpu/drm/tiny/ofdrm.c
> +++ b/drivers/gpu/drm/tiny/ofdrm.c
> +static void __iomem *ofdrm_qemu_cmap_ioremap(struct ofdrm_device *odev,
> + struct device_node *of_node,
> + u64 fb_base)
> +{
> +#ifdef __BIG_ENDIAN
> + static const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
> +#else
> + static const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 };
> +#endif
You can easily get rid of the #ifdef:
static const __be32 io_of_addr[3] = { cpu_to_be32(0x01000000), 0x0, 0x0 };
And probably sparse ("make C=2") will complain about the plain zeros,
so "cpu_to_be32(0x0)" as well.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 9+ messages in thread