372 lines
12 KiB
C
372 lines
12 KiB
C
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/*
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* Copyright (C) 2014 Intel Corporation
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*
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* DRM universal plane helper functions
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/list.h>
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#include <drm/drmP.h>
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#include <drm/drm_plane_helper.h>
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#include <drm/drm_rect.h>
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#include <drm/drm_plane_helper.h>
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#define SUBPIXEL_MASK 0xffff
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/*
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* This is the minimal list of formats that seem to be safe for modeset use
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* with all current DRM drivers. Most hardware can actually support more
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* formats than this and drivers may specify a more accurate list when
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* creating the primary plane. However drivers that still call
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* drm_plane_init() will use this minimal format list as the default.
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*/
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static const uint32_t safe_modeset_formats[] = {
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DRM_FORMAT_XRGB8888,
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DRM_FORMAT_ARGB8888,
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};
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/*
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* Returns the connectors currently associated with a CRTC. This function
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* should be called twice: once with a NULL connector list to retrieve
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* the list size, and once with the properly allocated list to be filled in.
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*/
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static int get_connectors_for_crtc(struct drm_crtc *crtc,
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struct drm_connector **connector_list,
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int num_connectors)
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{
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struct drm_device *dev = crtc->dev;
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struct drm_connector *connector;
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int count = 0;
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/*
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* Note: Once we change the plane hooks to more fine-grained locking we
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* need to grab the connection_mutex here to be able to make these
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* checks.
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*/
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WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
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list_for_each_entry(connector, &dev->mode_config.connector_list, head)
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if (connector->encoder && connector->encoder->crtc == crtc) {
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if (connector_list != NULL && count < num_connectors)
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*(connector_list++) = connector;
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count++;
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}
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return count;
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}
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/**
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* drm_plane_helper_check_update() - Check plane update for validity
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* @plane: plane object to update
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* @crtc: owning CRTC of owning plane
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* @fb: framebuffer to flip onto plane
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* @src: source coordinates in 16.16 fixed point
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* @dest: integer destination coordinates
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* @clip: integer clipping coordinates
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* @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point
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* @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point
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* @can_position: is it legal to position the plane such that it
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* doesn't cover the entire crtc? This will generally
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* only be false for primary planes.
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* @can_update_disabled: can the plane be updated while the crtc
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* is disabled?
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* @visible: output parameter indicating whether plane is still visible after
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* clipping
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*
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* Checks that a desired plane update is valid. Drivers that provide
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* their own plane handling rather than helper-provided implementations may
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* still wish to call this function to avoid duplication of error checking
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* code.
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*
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* RETURNS:
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* Zero if update appears valid, error code on failure
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*/
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int drm_plane_helper_check_update(struct drm_plane *plane,
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struct drm_crtc *crtc,
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struct drm_framebuffer *fb,
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struct drm_rect *src,
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struct drm_rect *dest,
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const struct drm_rect *clip,
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int min_scale,
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int max_scale,
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bool can_position,
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bool can_update_disabled,
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bool *visible)
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{
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int hscale, vscale;
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if (!crtc->enabled && !can_update_disabled) {
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DRM_DEBUG_KMS("Cannot update plane of a disabled CRTC.\n");
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return -EINVAL;
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}
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/* Check scaling */
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hscale = drm_rect_calc_hscale(src, dest, min_scale, max_scale);
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vscale = drm_rect_calc_vscale(src, dest, min_scale, max_scale);
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if (hscale < 0 || vscale < 0) {
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DRM_DEBUG_KMS("Invalid scaling of plane\n");
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return -ERANGE;
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}
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*visible = drm_rect_clip_scaled(src, dest, clip, hscale, vscale);
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if (!*visible)
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/*
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* Plane isn't visible; some drivers can handle this
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* so we just return success here. Drivers that can't
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* (including those that use the primary plane helper's
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* update function) will return an error from their
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* update_plane handler.
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*/
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return 0;
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if (!can_position && !drm_rect_equals(dest, clip)) {
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DRM_DEBUG_KMS("Plane must cover entire CRTC\n");
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return -EINVAL;
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}
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return 0;
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}
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EXPORT_SYMBOL(drm_plane_helper_check_update);
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/**
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* drm_primary_helper_update() - Helper for primary plane update
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* @plane: plane object to update
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* @crtc: owning CRTC of owning plane
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* @fb: framebuffer to flip onto plane
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* @crtc_x: x offset of primary plane on crtc
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* @crtc_y: y offset of primary plane on crtc
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* @crtc_w: width of primary plane rectangle on crtc
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* @crtc_h: height of primary plane rectangle on crtc
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* @src_x: x offset of @fb for panning
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* @src_y: y offset of @fb for panning
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* @src_w: width of source rectangle in @fb
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* @src_h: height of source rectangle in @fb
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*
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* Provides a default plane update handler for primary planes. This is handler
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* is called in response to a userspace SetPlane operation on the plane with a
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* non-NULL framebuffer. We call the driver's modeset handler to update the
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* framebuffer.
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*
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* SetPlane() on a primary plane of a disabled CRTC is not supported, and will
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* return an error.
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*
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* Note that we make some assumptions about hardware limitations that may not be
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* true for all hardware --
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* 1) Primary plane cannot be repositioned.
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* 2) Primary plane cannot be scaled.
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* 3) Primary plane must cover the entire CRTC.
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* 4) Subpixel positioning is not supported.
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* Drivers for hardware that don't have these restrictions can provide their
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* own implementation rather than using this helper.
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*
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* RETURNS:
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* Zero on success, error code on failure
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*/
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int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
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struct drm_framebuffer *fb,
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int crtc_x, int crtc_y,
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unsigned int crtc_w, unsigned int crtc_h,
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uint32_t src_x, uint32_t src_y,
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uint32_t src_w, uint32_t src_h)
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{
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struct drm_mode_set set = {
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.crtc = crtc,
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.fb = fb,
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.mode = &crtc->mode,
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.x = src_x >> 16,
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.y = src_y >> 16,
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};
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struct drm_rect src = {
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.x1 = src_x,
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.y1 = src_y,
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.x2 = src_x + src_w,
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.y2 = src_y + src_h,
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};
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struct drm_rect dest = {
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.x1 = crtc_x,
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.y1 = crtc_y,
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.x2 = crtc_x + crtc_w,
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.y2 = crtc_y + crtc_h,
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};
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const struct drm_rect clip = {
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.x2 = crtc->mode.hdisplay,
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.y2 = crtc->mode.vdisplay,
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};
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struct drm_connector **connector_list;
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int num_connectors, ret;
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bool visible;
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ret = drm_plane_helper_check_update(plane, crtc, fb,
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&src, &dest, &clip,
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DRM_PLANE_HELPER_NO_SCALING,
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DRM_PLANE_HELPER_NO_SCALING,
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false, false, &visible);
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if (ret)
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return ret;
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if (!visible)
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/*
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* Primary plane isn't visible. Note that unless a driver
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* provides their own disable function, this will just
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* wind up returning -EINVAL to userspace.
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*/
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return plane->funcs->disable_plane(plane);
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/* Find current connectors for CRTC */
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num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
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BUG_ON(num_connectors == 0);
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connector_list = kzalloc(num_connectors * sizeof(*connector_list),
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GFP_KERNEL);
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if (!connector_list)
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return -ENOMEM;
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get_connectors_for_crtc(crtc, connector_list, num_connectors);
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set.connectors = connector_list;
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set.num_connectors = num_connectors;
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/*
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* We call set_config() directly here rather than using
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* drm_mode_set_config_internal. We're reprogramming the same
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* connectors that were already in use, so we shouldn't need the extra
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* cross-CRTC fb refcounting to accomodate stealing connectors.
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* drm_mode_setplane() already handles the basic refcounting for the
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* framebuffers involved in this operation.
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*/
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ret = crtc->funcs->set_config(&set);
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kfree(connector_list);
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return ret;
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}
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EXPORT_SYMBOL(drm_primary_helper_update);
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/**
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* drm_primary_helper_disable() - Helper for primary plane disable
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* @plane: plane to disable
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*
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* Provides a default plane disable handler for primary planes. This is handler
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* is called in response to a userspace SetPlane operation on the plane with a
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* NULL framebuffer parameter. It unconditionally fails the disable call with
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* -EINVAL the only way to disable the primary plane without driver support is
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* to disable the entier CRTC. Which does not match the plane ->disable hook.
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*
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* Note that some hardware may be able to disable the primary plane without
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* disabling the whole CRTC. Drivers for such hardware should provide their
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* own disable handler that disables just the primary plane (and they'll likely
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* need to provide their own update handler as well to properly re-enable a
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* disabled primary plane).
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*
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* RETURNS:
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* Unconditionally returns -EINVAL.
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*/
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int drm_primary_helper_disable(struct drm_plane *plane)
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{
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return -EINVAL;
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}
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EXPORT_SYMBOL(drm_primary_helper_disable);
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/**
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* drm_primary_helper_destroy() - Helper for primary plane destruction
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* @plane: plane to destroy
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*
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* Provides a default plane destroy handler for primary planes. This handler
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* is called during CRTC destruction. We disable the primary plane, remove
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* it from the DRM plane list, and deallocate the plane structure.
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*/
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void drm_primary_helper_destroy(struct drm_plane *plane)
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{
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drm_plane_cleanup(plane);
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kfree(plane);
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}
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EXPORT_SYMBOL(drm_primary_helper_destroy);
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const struct drm_plane_funcs drm_primary_helper_funcs = {
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.update_plane = drm_primary_helper_update,
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.disable_plane = drm_primary_helper_disable,
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.destroy = drm_primary_helper_destroy,
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};
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EXPORT_SYMBOL(drm_primary_helper_funcs);
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/**
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* drm_primary_helper_create_plane() - Create a generic primary plane
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* @dev: drm device
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* @formats: pixel formats supported, or NULL for a default safe list
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* @num_formats: size of @formats; ignored if @formats is NULL
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*
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* Allocates and initializes a primary plane that can be used with the primary
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* plane helpers. Drivers that wish to use driver-specific plane structures or
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* provide custom handler functions may perform their own allocation and
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* initialization rather than calling this function.
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*/
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struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,
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const uint32_t *formats,
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int num_formats)
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{
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struct drm_plane *primary;
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int ret;
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primary = kzalloc(sizeof(*primary), GFP_KERNEL);
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if (primary == NULL) {
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DRM_DEBUG_KMS("Failed to allocate primary plane\n");
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return NULL;
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}
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if (formats == NULL) {
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formats = safe_modeset_formats;
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num_formats = ARRAY_SIZE(safe_modeset_formats);
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}
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/* possible_crtc's will be filled in later by crtc_init */
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ret = drm_universal_plane_init(dev, primary, 0,
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&drm_primary_helper_funcs,
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formats, num_formats,
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DRM_PLANE_TYPE_PRIMARY);
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if (ret) {
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kfree(primary);
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primary = NULL;
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}
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return primary;
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}
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EXPORT_SYMBOL(drm_primary_helper_create_plane);
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/**
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* drm_crtc_init - Legacy CRTC initialization function
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* @dev: DRM device
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* @crtc: CRTC object to init
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* @funcs: callbacks for the new CRTC
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*
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* Initialize a CRTC object with a default helper-provided primary plane and no
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* cursor plane.
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*
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* Returns:
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* Zero on success, error code on failure.
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*/
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int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
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const struct drm_crtc_funcs *funcs)
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|
{
|
||
|
|
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);
|