--- /dev/null
+/*
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * DRM universal plane helper functions
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/list.h>
+#include <drm/drmP.h>
+#include <drm/drm_rect.h>
+
+#define SUBPIXEL_MASK 0xffff
+
+/*
+ * This is the minimal list of formats that seem to be safe for modeset use
+ * with all current DRM drivers. Most hardware can actually support more
+ * formats than this and drivers may specify a more accurate list when
+ * creating the primary plane. However drivers that still call
+ * drm_plane_init() will use this minimal format list as the default.
+ */
+const static uint32_t safe_modeset_formats[] = {
+ DRM_FORMAT_XRGB8888,
+ DRM_FORMAT_ARGB8888,
+};
+
+/*
+ * Returns the connectors currently associated with a CRTC. This function
+ * should be called twice: once with a NULL connector list to retrieve
+ * the list size, and once with the properly allocated list to be filled in.
+ */
+static int get_connectors_for_crtc(struct drm_crtc *crtc,
+ struct drm_connector **connector_list,
+ int num_connectors)
+{
+ struct drm_device *dev = crtc->dev;
+ struct drm_connector *connector;
+ int count = 0;
+
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head)
+ if (connector->encoder && connector->encoder->crtc == crtc) {
+ if (connector_list != NULL && count < num_connectors)
+ *(connector_list++) = connector;
+
+ count++;
+ }
+
+ return count;
+}
+
+/**
+ * drm_primary_helper_update() - Helper for primary plane update
+ * @plane: plane object to update
+ * @crtc: owning CRTC of owning plane
+ * @fb: framebuffer to flip onto plane
+ * @crtc_x: x offset of primary plane on crtc
+ * @crtc_y: y offset of primary plane on crtc
+ * @crtc_w: width of primary plane rectangle on crtc
+ * @crtc_h: height of primary plane rectangle on crtc
+ * @src_x: x offset of @fb for panning
+ * @src_y: y offset of @fb for panning
+ * @src_w: width of source rectangle in @fb
+ * @src_h: height of source rectangle in @fb
+ *
+ * Provides a default plane update handler for primary planes. This is handler
+ * is called in response to a userspace SetPlane operation on the plane with a
+ * non-NULL framebuffer. We call the driver's modeset handler to update the
+ * framebuffer.
+ *
+ * SetPlane() on a primary plane of a disabled CRTC is not supported, and will
+ * return an error.
+ *
+ * Note that we make some assumptions about hardware limitations that may not be
+ * true for all hardware --
+ * 1) Primary plane cannot be repositioned.
+ * 2) Primary plane cannot be scaled.
+ * 3) Primary plane must cover the entire CRTC.
+ * 4) Subpixel positioning is not supported.
+ * Drivers for hardware that don't have these restrictions can provide their
+ * own implementation rather than using this helper.
+ *
+ * RETURNS:
+ * Zero on success, error code on failure
+ */
+int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
+ struct drm_framebuffer *fb,
+ int crtc_x, int crtc_y,
+ unsigned int crtc_w, unsigned int crtc_h,
+ uint32_t src_x, uint32_t src_y,
+ uint32_t src_w, uint32_t src_h)
+{
+ struct drm_mode_set set = {
+ .crtc = crtc,
+ .fb = fb,
+ .mode = &crtc->mode,
+ .x = src_x >> 16,
+ .y = src_y >> 16,
+ };
+ struct drm_rect dest = {
+ .x1 = crtc_x,
+ .y1 = crtc_y,
+ .x2 = crtc_x + crtc_w,
+ .y2 = crtc_y + crtc_h,
+ };
+ struct drm_rect clip = {
+ .x2 = crtc->mode.hdisplay,
+ .y2 = crtc->mode.vdisplay,
+ };
+ struct drm_connector **connector_list;
+ struct drm_framebuffer *tmpfb;
+ int num_connectors, ret;
+
+ if (!crtc->enabled) {
+ DRM_DEBUG_KMS("Cannot update primary plane of a disabled CRTC.\n");
+ return -EINVAL;
+ }
+
+ /* Disallow subpixel positioning */
+ if ((src_x | src_y | src_w | src_h) & SUBPIXEL_MASK) {
+ DRM_DEBUG_KMS("Primary plane does not support subpixel positioning\n");
+ return -EINVAL;
+ }
+
+ /* Primary planes are locked to their owning CRTC */
+ if (plane->possible_crtcs != drm_crtc_mask(crtc)) {
+ DRM_DEBUG_KMS("Cannot change primary plane CRTC\n");
+ return -EINVAL;
+ }
+
+ /* Disallow scaling */
+ if (crtc_w != src_w || crtc_h != src_h) {
+ DRM_DEBUG_KMS("Can't scale primary plane\n");
+ return -EINVAL;
+ }
+
+ /* Make sure primary plane covers entire CRTC */
+ drm_rect_intersect(&dest, &clip);
+ if (dest.x1 != 0 || dest.y1 != 0 ||
+ dest.x2 != crtc->mode.hdisplay || dest.y2 != crtc->mode.vdisplay) {
+ DRM_DEBUG_KMS("Primary plane must cover entire CRTC\n");
+ return -EINVAL;
+ }
+
+ /* Framebuffer must be big enough to cover entire plane */
+ ret = drm_crtc_check_viewport(crtc, crtc_x, crtc_y, &crtc->mode, fb);
+ if (ret)
+ return ret;
+
+ /* Find current connectors for CRTC */
+ num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
+ BUG_ON(num_connectors == 0);
+ connector_list = kzalloc(num_connectors * sizeof(*connector_list),
+ GFP_KERNEL);
+ if (!connector_list)
+ return -ENOMEM;
+ get_connectors_for_crtc(crtc, connector_list, num_connectors);
+
+ set.connectors = connector_list;
+ set.num_connectors = num_connectors;
+
+ /*
+ * set_config() adjusts crtc->primary->fb; however the DRM setplane
+ * code that called us expects to handle the framebuffer update and
+ * reference counting; save and restore the current fb before
+ * calling it.
+ *
+ * N.B., we call set_config() directly here rather than using
+ * drm_mode_set_config_internal. We're reprogramming the same
+ * connectors that were already in use, so we shouldn't need the extra
+ * cross-CRTC fb refcounting to accomodate stealing connectors.
+ * drm_mode_setplane() already handles the basic refcounting for the
+ * framebuffers involved in this operation.
+ */
+ tmpfb = plane->fb;
+ ret = crtc->funcs->set_config(&set);
+ plane->fb = tmpfb;
+
+ kfree(connector_list);
+ return ret;
+}
+EXPORT_SYMBOL(drm_primary_helper_update);
+
+/**
+ * drm_primary_helper_disable() - Helper for primary plane disable
+ * @plane: plane to disable
+ *
+ * Provides a default plane disable handler for primary planes. This is handler
+ * is called in response to a userspace SetPlane operation on the plane with a
+ * NULL framebuffer parameter. We call the driver's modeset handler with a NULL
+ * framebuffer to disable the CRTC if no other planes are currently enabled.
+ * If other planes are still enabled on the same CRTC, we return -EBUSY.
+ *
+ * Note that some hardware may be able to disable the primary plane without
+ * disabling the whole CRTC. Drivers for such hardware should provide their
+ * own disable handler that disables just the primary plane (and they'll likely
+ * need to provide their own update handler as well to properly re-enable a
+ * disabled primary plane).
+ *
+ * RETURNS:
+ * Zero on success, error code on failure
+ */
+int drm_primary_helper_disable(struct drm_plane *plane)
+{
+ struct drm_plane *p;
+ struct drm_mode_set set = {
+ .crtc = plane->crtc,
+ .fb = NULL,
+ };
+
+ if (plane->crtc == NULL || plane->fb == NULL)
+ /* Already disabled */
+ return 0;
+
+ list_for_each_entry(p, &plane->dev->mode_config.plane_list, head)
+ if (p != plane && p->fb) {
+ DRM_DEBUG_KMS("Cannot disable primary plane while other planes are still active on CRTC.\n");
+ return -EBUSY;
+ }
+
+ /*
+ * N.B. We call set_config() directly here rather than
+ * drm_mode_set_config_internal() since drm_mode_setplane() already
+ * handles the basic refcounting and we don't need the special
+ * cross-CRTC refcounting (no chance of stealing connectors from
+ * other CRTC's with this update).
+ */
+ return plane->crtc->funcs->set_config(&set);
+}
+EXPORT_SYMBOL(drm_primary_helper_disable);
+
+/**
+ * drm_primary_helper_destroy() - Helper for primary plane destruction
+ * @plane: plane to destroy
+ *
+ * Provides a default plane destroy handler for primary planes. This handler
+ * is called during CRTC destruction. We disable the primary plane, remove
+ * it from the DRM plane list, and deallocate the plane structure.
+ */
+void drm_primary_helper_destroy(struct drm_plane *plane)
+{
+ plane->funcs->disable_plane(plane);
+ drm_plane_cleanup(plane);
+ kfree(plane);
+}
+EXPORT_SYMBOL(drm_primary_helper_destroy);
+
+const struct drm_plane_funcs drm_primary_helper_funcs = {
+ .update_plane = drm_primary_helper_update,
+ .disable_plane = drm_primary_helper_disable,
+ .destroy = drm_primary_helper_destroy,
+};
+EXPORT_SYMBOL(drm_primary_helper_funcs);
+
+/**
+ * drm_primary_helper_create_plane() - Create a generic primary plane
+ * @dev: drm device
+ * @formats: pixel formats supported, or NULL for a default safe list
+ * @num_formats: size of @formats; ignored if @formats is NULL
+ *
+ * Allocates and initializes a primary plane that can be used with the primary
+ * plane helpers. Drivers that wish to use driver-specific plane structures or
+ * provide custom handler functions may perform their own allocation and
+ * initialization rather than calling this function.
+ */
+struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,
+ const uint32_t *formats,
+ int num_formats)
+{
+ struct drm_plane *primary;
+ int ret;
+
+ primary = kzalloc(sizeof(*primary), GFP_KERNEL);
+ if (primary == NULL) {
+ DRM_DEBUG_KMS("Failed to allocate primary plane\n");
+ return NULL;
+ }
+
+ if (formats == NULL) {
+ formats = safe_modeset_formats;
+ num_formats = ARRAY_SIZE(safe_modeset_formats);
+ }
+
+ /* possible_crtc's will be filled in later by crtc_init */
+ ret = drm_plane_init(dev, primary, 0, &drm_primary_helper_funcs,
+ formats, num_formats,
+ DRM_PLANE_TYPE_PRIMARY);
+ if (ret) {
+ kfree(primary);
+ primary = NULL;
+ }
+
+ return primary;
+}
+EXPORT_SYMBOL(drm_primary_helper_create_plane);
+
--- /dev/null
+/*
+ * Copyright (C) 2011-2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef DRM_PLANE_HELPER_H
+#define DRM_PLANE_HELPER_H
+
+/**
+ * DOC: plane helpers
+ *
+ * Helper functions to assist with creation and handling of CRTC primary
+ * planes.
+ */
+
+extern int drm_primary_helper_update(struct drm_plane *plane,
+ struct drm_crtc *crtc,
+ struct drm_framebuffer *fb,
+ int crtc_x, int crtc_y,
+ unsigned int crtc_w, unsigned int crtc_h,
+ uint32_t src_x, uint32_t src_y,
+ uint32_t src_w, uint32_t src_h);
+extern int drm_primary_helper_disable(struct drm_plane *plane);
+extern void drm_primary_helper_destroy(struct drm_plane *plane);
+extern const struct drm_plane_funcs drm_primary_helper_funcs;
+extern struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,
+ uint32_t *formats,
+ int num_formats);
+
+
+#endif
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff