334 lines
11 KiB
C
334 lines
11 KiB
C
/*
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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_rect.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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const static 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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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_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 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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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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struct drm_framebuffer *tmpfb;
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int num_connectors, ret;
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if (!crtc->enabled) {
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DRM_DEBUG_KMS("Cannot update primary plane of a disabled CRTC.\n");
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return -EINVAL;
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}
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/* Disallow subpixel positioning */
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if ((src_x | src_y | src_w | src_h) & SUBPIXEL_MASK) {
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DRM_DEBUG_KMS("Primary plane does not support subpixel positioning\n");
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return -EINVAL;
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}
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/* Primary planes are locked to their owning CRTC */
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if (plane->possible_crtcs != drm_crtc_mask(crtc)) {
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DRM_DEBUG_KMS("Cannot change primary plane CRTC\n");
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return -EINVAL;
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}
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/* Disallow scaling */
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if (crtc_w != src_w || crtc_h != src_h) {
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DRM_DEBUG_KMS("Can't scale primary plane\n");
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return -EINVAL;
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}
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/* Make sure primary plane covers entire CRTC */
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drm_rect_intersect(&dest, &clip);
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if (dest.x1 != 0 || dest.y1 != 0 ||
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dest.x2 != crtc->mode.hdisplay || dest.y2 != crtc->mode.vdisplay) {
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DRM_DEBUG_KMS("Primary plane must cover entire CRTC\n");
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return -EINVAL;
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}
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/* Framebuffer must be big enough to cover entire plane */
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ret = drm_crtc_check_viewport(crtc, crtc_x, crtc_y, &crtc->mode, fb);
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if (ret)
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return ret;
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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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* set_config() adjusts crtc->primary->fb; however the DRM setplane
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* code that called us expects to handle the framebuffer update and
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* reference counting; save and restore the current fb before
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* calling it.
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*
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* N.B., 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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tmpfb = plane->fb;
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ret = crtc->funcs->set_config(&set);
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plane->fb = tmpfb;
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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. We call the driver's modeset handler with a NULL
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* framebuffer to disable the CRTC if no other planes are currently enabled.
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* If other planes are still enabled on the same CRTC, we return -EBUSY.
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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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* Zero on success, error code on failure
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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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struct drm_plane *p;
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struct drm_mode_set set = {
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.crtc = plane->crtc,
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.fb = NULL,
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};
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if (plane->crtc == NULL || plane->fb == NULL)
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/* Already disabled */
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return 0;
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list_for_each_entry(p, &plane->dev->mode_config.plane_list, head)
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if (p != plane && p->fb) {
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DRM_DEBUG_KMS("Cannot disable primary plane while other planes are still active on CRTC.\n");
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return -EBUSY;
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}
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/*
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* N.B. We call set_config() directly here rather than
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* drm_mode_set_config_internal() since drm_mode_setplane() already
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* handles the basic refcounting and we don't need the special
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* cross-CRTC refcounting (no chance of stealing connectors from
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* other CRTC's with this update).
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*/
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return plane->crtc->funcs->set_config(&set);
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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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plane->funcs->disable_plane(plane);
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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_plane_init(dev, primary, 0, &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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{
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struct drm_plane *primary;
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primary = drm_primary_helper_create_plane(dev, NULL, 0);
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return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs);
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}
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EXPORT_SYMBOL(drm_crtc_init);
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