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Diffstat (limited to 'drivers/gpu/drm/drm_plane_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_plane_helper.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c new file mode 100644 index 000000000000..d2b1c03b3d71 --- /dev/null +++ b/drivers/gpu/drm/drm_plane_helper.c @@ -0,0 +1,310 @@ +/* + * 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. It unconditionally fails the disable call with + * -EINVAL the only way to disable the primary plane without driver support is + * to disable the entier CRTC. Which does not match the plane ->disable hook. + * + * 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: + * Unconditionally returns -EINVAL. + */ +int drm_primary_helper_disable(struct drm_plane *plane) +{ + return -EINVAL; +} +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); + +/** + * drm_crtc_init - Legacy CRTC initialization function + * @dev: DRM device + * @crtc: CRTC object to init + * @funcs: callbacks for the new CRTC + * + * Initialize a CRTC object with a default helper-provided primary plane and no + * cursor plane. + * + * Returns: + * Zero on success, error code on failure. + */ +int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc, + const struct drm_crtc_funcs *funcs) +{ + struct drm_plane *primary; + + primary = drm_primary_helper_create_plane(dev, NULL, 0); + return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs); +} +EXPORT_SYMBOL(drm_crtc_init); |