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![Daniel Vetter](/assets/img/avatar_default.png)
Ville ocd'ed the parameter name, but forgot to update the docs!
Fixes: df86af9133
("drm/plane-helper: Add drm_plane_helper_check_state()")
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1471034937-651-21-git-send-email-daniel.vetter@ffwll.ch
621 lines
19 KiB
C
621 lines
19 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_plane_helper.h>
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#include <drm/drm_rect.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_atomic_helper.h>
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#define SUBPIXEL_MASK 0xffff
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/**
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* DOC: overview
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*
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* This helper library has two parts. The first part has support to implement
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* primary plane support on top of the normal CRTC configuration interface.
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* Since the legacy ->set_config interface ties the primary plane together with
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* the CRTC state this does not allow userspace to disable the primary plane
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* itself. To avoid too much duplicated code use
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* drm_plane_helper_check_update() which can be used to enforce the same
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* restrictions as primary planes had thus. The default primary plane only
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* expose XRBG8888 and ARGB8888 as valid pixel formats for the attached
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* framebuffer.
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*
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* Drivers are highly recommended to implement proper support for primary
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* planes, and newly merged drivers must not rely upon these transitional
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* helpers.
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*
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* The second part also implements transitional helpers which allow drivers to
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* gradually switch to the atomic helper infrastructure for plane updates. Once
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* that switch is complete drivers shouldn't use these any longer, instead using
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* the proper legacy implementations for update and disable plane hooks provided
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* by the atomic helpers.
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*
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* Again drivers are strongly urged to switch to the new interfaces.
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*
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* The plane helpers share the function table structures with other helpers,
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* specifically also the atomic helpers. See struct &drm_plane_helper_funcs for
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* the details.
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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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drm_for_each_connector(connector, dev) {
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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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}
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return count;
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}
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/**
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* drm_plane_helper_check_state() - Check plane state for validity
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* @state: plane state to check
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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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*
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* Checks that a desired plane update is valid, and updates various
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* bits of derived state (clipped coordinates etc.). 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_state(struct drm_plane_state *state,
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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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{
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struct drm_crtc *crtc = state->crtc;
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struct drm_framebuffer *fb = state->fb;
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struct drm_rect *src = &state->src;
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struct drm_rect *dst = &state->dst;
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unsigned int rotation = state->rotation;
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int hscale, vscale;
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src->x1 = state->src_x;
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src->y1 = state->src_y;
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src->x2 = state->src_x + state->src_w;
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src->y2 = state->src_y + state->src_h;
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dst->x1 = state->crtc_x;
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dst->y1 = state->crtc_y;
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dst->x2 = state->crtc_x + state->crtc_w;
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dst->y2 = state->crtc_y + state->crtc_h;
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if (!fb) {
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state->visible = false;
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return 0;
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}
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/* crtc should only be NULL when disabling (i.e., !fb) */
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if (WARN_ON(!crtc)) {
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state->visible = false;
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return 0;
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}
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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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drm_rect_rotate(src, fb->width << 16, fb->height << 16, rotation);
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/* Check scaling */
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hscale = drm_rect_calc_hscale(src, dst, min_scale, max_scale);
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vscale = drm_rect_calc_vscale(src, dst, 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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drm_rect_debug_print("src: ", &state->src, true);
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drm_rect_debug_print("dst: ", &state->dst, false);
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return -ERANGE;
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}
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state->visible = drm_rect_clip_scaled(src, dst, clip, hscale, vscale);
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drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16, rotation);
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if (!state->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(dst, clip)) {
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DRM_DEBUG_KMS("Plane must cover entire CRTC\n");
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drm_rect_debug_print("dst: ", dst, false);
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drm_rect_debug_print("clip: ", clip, false);
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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_state);
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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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* @dst: integer destination coordinates
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* @clip: integer clipping coordinates
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* @rotation: plane rotation
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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 *dst,
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const struct drm_rect *clip,
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unsigned int rotation,
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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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struct drm_plane_state state = {
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.plane = plane,
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.crtc = crtc,
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.fb = fb,
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.src_x = src->x1,
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.src_y = src->y1,
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.src_w = drm_rect_width(src),
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.src_h = drm_rect_height(src),
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.crtc_x = dst->x1,
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.crtc_y = dst->y1,
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.crtc_w = drm_rect_width(dst),
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.crtc_h = drm_rect_height(dst),
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.rotation = rotation,
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.visible = *visible,
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};
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int ret;
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ret = drm_plane_helper_check_state(&state, clip,
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min_scale, max_scale,
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can_position,
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can_update_disabled);
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if (ret)
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return ret;
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*src = state.src;
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*dst = state.dst;
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*visible = state.visible;
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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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*
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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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*
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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_ROTATE_0,
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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
|
|
* 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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|
|
/**
|
|
* drm_primary_helper_destroy() - Helper for primary plane destruction
|
|
* @plane: plane to destroy
|
|
*
|
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* Provides a default plane destroy handler for primary planes. This handler
|
|
* 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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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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int drm_plane_helper_commit(struct drm_plane *plane,
|
|
struct drm_plane_state *plane_state,
|
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struct drm_framebuffer *old_fb)
|
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{
|
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const struct drm_plane_helper_funcs *plane_funcs;
|
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struct drm_crtc *crtc[2];
|
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const struct drm_crtc_helper_funcs *crtc_funcs[2];
|
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int i, ret = 0;
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|
|
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plane_funcs = plane->helper_private;
|
|
|
|
/* Since this is a transitional helper we can't assume that plane->state
|
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* is always valid. Hence we need to use plane->crtc instead of
|
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* plane->state->crtc as the old crtc. */
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|
crtc[0] = plane->crtc;
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crtc[1] = crtc[0] != plane_state->crtc ? plane_state->crtc : NULL;
|
|
|
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for (i = 0; i < 2; i++)
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crtc_funcs[i] = crtc[i] ? crtc[i]->helper_private : NULL;
|
|
|
|
if (plane_funcs->atomic_check) {
|
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ret = plane_funcs->atomic_check(plane, plane_state);
|
|
if (ret)
|
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goto out;
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}
|
|
|
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if (plane_funcs->prepare_fb && plane_state->fb &&
|
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plane_state->fb != old_fb) {
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ret = plane_funcs->prepare_fb(plane,
|
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plane_state);
|
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if (ret)
|
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goto out;
|
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}
|
|
|
|
/* Point of no return, commit sw state. */
|
|
swap(plane->state, plane_state);
|
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|
|
for (i = 0; i < 2; i++) {
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if (crtc_funcs[i] && crtc_funcs[i]->atomic_begin)
|
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crtc_funcs[i]->atomic_begin(crtc[i], crtc[i]->state);
|
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}
|
|
|
|
/*
|
|
* Drivers may optionally implement the ->atomic_disable callback, so
|
|
* special-case that here.
|
|
*/
|
|
if (drm_atomic_plane_disabling(plane, plane_state) &&
|
|
plane_funcs->atomic_disable)
|
|
plane_funcs->atomic_disable(plane, plane_state);
|
|
else
|
|
plane_funcs->atomic_update(plane, plane_state);
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
if (crtc_funcs[i] && crtc_funcs[i]->atomic_flush)
|
|
crtc_funcs[i]->atomic_flush(crtc[i], crtc[i]->state);
|
|
}
|
|
|
|
/*
|
|
* If we only moved the plane and didn't change fb's, there's no need to
|
|
* wait for vblank.
|
|
*/
|
|
if (plane->state->fb == old_fb)
|
|
goto out;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
if (!crtc[i])
|
|
continue;
|
|
|
|
if (crtc[i]->cursor == plane)
|
|
continue;
|
|
|
|
/* There's no other way to figure out whether the crtc is running. */
|
|
ret = drm_crtc_vblank_get(crtc[i]);
|
|
if (ret == 0) {
|
|
drm_crtc_wait_one_vblank(crtc[i]);
|
|
drm_crtc_vblank_put(crtc[i]);
|
|
}
|
|
|
|
ret = 0;
|
|
}
|
|
|
|
if (plane_funcs->cleanup_fb)
|
|
plane_funcs->cleanup_fb(plane, plane_state);
|
|
out:
|
|
if (plane_state) {
|
|
if (plane->funcs->atomic_destroy_state)
|
|
plane->funcs->atomic_destroy_state(plane, plane_state);
|
|
else
|
|
drm_atomic_helper_plane_destroy_state(plane, plane_state);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* drm_plane_helper_update() - Transitional helper for 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 using the atomic plane update
|
|
* functions. It is fully left to the driver to check plane constraints and
|
|
* handle corner-cases like a fully occluded or otherwise invisible plane.
|
|
*
|
|
* This is useful for piecewise transitioning of a driver to the atomic helpers.
|
|
*
|
|
* RETURNS:
|
|
* Zero on success, error code on failure
|
|
*/
|
|
int drm_plane_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_plane_state *plane_state;
|
|
|
|
if (plane->funcs->atomic_duplicate_state)
|
|
plane_state = plane->funcs->atomic_duplicate_state(plane);
|
|
else {
|
|
if (!plane->state)
|
|
drm_atomic_helper_plane_reset(plane);
|
|
|
|
plane_state = drm_atomic_helper_plane_duplicate_state(plane);
|
|
}
|
|
if (!plane_state)
|
|
return -ENOMEM;
|
|
plane_state->plane = plane;
|
|
|
|
plane_state->crtc = crtc;
|
|
drm_atomic_set_fb_for_plane(plane_state, fb);
|
|
plane_state->crtc_x = crtc_x;
|
|
plane_state->crtc_y = crtc_y;
|
|
plane_state->crtc_h = crtc_h;
|
|
plane_state->crtc_w = crtc_w;
|
|
plane_state->src_x = src_x;
|
|
plane_state->src_y = src_y;
|
|
plane_state->src_h = src_h;
|
|
plane_state->src_w = src_w;
|
|
|
|
return drm_plane_helper_commit(plane, plane_state, plane->fb);
|
|
}
|
|
EXPORT_SYMBOL(drm_plane_helper_update);
|
|
|
|
/**
|
|
* drm_plane_helper_disable() - Transitional helper for plane disable
|
|
* @plane: plane to disable
|
|
*
|
|
* Provides a default plane disable handler using the atomic plane update
|
|
* functions. It is fully left to the driver to check plane constraints and
|
|
* handle corner-cases like a fully occluded or otherwise invisible plane.
|
|
*
|
|
* This is useful for piecewise transitioning of a driver to the atomic helpers.
|
|
*
|
|
* RETURNS:
|
|
* Zero on success, error code on failure
|
|
*/
|
|
int drm_plane_helper_disable(struct drm_plane *plane)
|
|
{
|
|
struct drm_plane_state *plane_state;
|
|
|
|
/* crtc helpers love to call disable functions for already disabled hw
|
|
* functions. So cope with that. */
|
|
if (!plane->crtc)
|
|
return 0;
|
|
|
|
if (plane->funcs->atomic_duplicate_state)
|
|
plane_state = plane->funcs->atomic_duplicate_state(plane);
|
|
else {
|
|
if (!plane->state)
|
|
drm_atomic_helper_plane_reset(plane);
|
|
|
|
plane_state = drm_atomic_helper_plane_duplicate_state(plane);
|
|
}
|
|
if (!plane_state)
|
|
return -ENOMEM;
|
|
plane_state->plane = plane;
|
|
|
|
plane_state->crtc = NULL;
|
|
drm_atomic_set_fb_for_plane(plane_state, NULL);
|
|
|
|
return drm_plane_helper_commit(plane, plane_state, plane->fb);
|
|
}
|
|
EXPORT_SYMBOL(drm_plane_helper_disable);
|