diff options
Diffstat (limited to 'drivers/gpu/drm/drm_plane_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_plane_helper.c | 154 |
1 files changed, 107 insertions, 47 deletions
diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c index d2b1c03b3d7113..6d133149cc7487 100644 --- a/drivers/gpu/drm/drm_plane_helper.c +++ b/drivers/gpu/drm/drm_plane_helper.c @@ -25,7 +25,9 @@ #include <linux/list.h> #include <drm/drmP.h> +#include <drm/drm_plane_helper.h> #include <drm/drm_rect.h> +#include <drm/drm_plane_helper.h> #define SUBPIXEL_MASK 0xffff @@ -36,9 +38,9 @@ * creating the primary plane. However drivers that still call * drm_plane_init() will use this minimal format list as the default. */ -const static uint32_t safe_modeset_formats[] = { - DRM_FORMAT_XRGB8888, - DRM_FORMAT_ARGB8888, +static const uint32_t safe_modeset_formats[] = { + DRM_FORMAT_XRGB8888, + DRM_FORMAT_ARGB8888, }; /* @@ -54,6 +56,13 @@ static int get_connectors_for_crtc(struct drm_crtc *crtc, struct drm_connector *connector; int count = 0; + /* + * Note: Once we change the plane hooks to more fine-grained locking we + * need to grab the connection_mutex here to be able to make these + * checks. + */ + WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex)); + list_for_each_entry(connector, &dev->mode_config.connector_list, head) if (connector->encoder && connector->encoder->crtc == crtc) { if (connector_list != NULL && count < num_connectors) @@ -66,6 +75,79 @@ static int get_connectors_for_crtc(struct drm_crtc *crtc, } /** + * drm_plane_helper_check_update() - Check plane update for validity + * @plane: plane object to update + * @crtc: owning CRTC of owning plane + * @fb: framebuffer to flip onto plane + * @src: source coordinates in 16.16 fixed point + * @dest: integer destination coordinates + * @clip: integer clipping coordinates + * @min_scale: minimum @src:@dest scaling factor in 16.16 fixed point + * @max_scale: maximum @src:@dest scaling factor in 16.16 fixed point + * @can_position: is it legal to position the plane such that it + * doesn't cover the entire crtc? This will generally + * only be false for primary planes. + * @can_update_disabled: can the plane be updated while the crtc + * is disabled? + * @visible: output parameter indicating whether plane is still visible after + * clipping + * + * Checks that a desired plane update is valid. Drivers that provide + * their own plane handling rather than helper-provided implementations may + * still wish to call this function to avoid duplication of error checking + * code. + * + * RETURNS: + * Zero if update appears valid, error code on failure + */ +int drm_plane_helper_check_update(struct drm_plane *plane, + struct drm_crtc *crtc, + struct drm_framebuffer *fb, + struct drm_rect *src, + struct drm_rect *dest, + const struct drm_rect *clip, + int min_scale, + int max_scale, + bool can_position, + bool can_update_disabled, + bool *visible) +{ + int hscale, vscale; + + if (!crtc->enabled && !can_update_disabled) { + DRM_DEBUG_KMS("Cannot update plane of a disabled CRTC.\n"); + return -EINVAL; + } + + /* Check scaling */ + hscale = drm_rect_calc_hscale(src, dest, min_scale, max_scale); + vscale = drm_rect_calc_vscale(src, dest, min_scale, max_scale); + if (hscale < 0 || vscale < 0) { + DRM_DEBUG_KMS("Invalid scaling of plane\n"); + return -ERANGE; + } + + *visible = drm_rect_clip_scaled(src, dest, clip, hscale, vscale); + if (!*visible) + /* + * Plane isn't visible; some drivers can handle this + * so we just return success here. Drivers that can't + * (including those that use the primary plane helper's + * update function) will return an error from their + * update_plane handler. + */ + return 0; + + if (!can_position && !drm_rect_equals(dest, clip)) { + DRM_DEBUG_KMS("Plane must cover entire CRTC\n"); + return -EINVAL; + } + + return 0; +} +EXPORT_SYMBOL(drm_plane_helper_check_update); + +/** * drm_primary_helper_update() - Helper for primary plane update * @plane: plane object to update * @crtc: owning CRTC of owning plane @@ -113,56 +195,42 @@ int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc, .x = src_x >> 16, .y = src_y >> 16, }; + struct drm_rect src = { + .x1 = src_x, + .y1 = src_y, + .x2 = src_x + src_w, + .y2 = src_y + src_h, + }; struct drm_rect dest = { .x1 = crtc_x, .y1 = crtc_y, .x2 = crtc_x + crtc_w, .y2 = crtc_y + crtc_h, }; - struct drm_rect clip = { + const struct drm_rect clip = { .x2 = crtc->mode.hdisplay, .y2 = crtc->mode.vdisplay, }; struct drm_connector **connector_list; - struct drm_framebuffer *tmpfb; int num_connectors, ret; + bool visible; - if (!crtc->enabled) { - DRM_DEBUG_KMS("Cannot update primary plane of a disabled CRTC.\n"); - return -EINVAL; - } - - /* Disallow subpixel positioning */ - if ((src_x | src_y | src_w | src_h) & SUBPIXEL_MASK) { - DRM_DEBUG_KMS("Primary plane does not support subpixel positioning\n"); - return -EINVAL; - } - - /* Primary planes are locked to their owning CRTC */ - if (plane->possible_crtcs != drm_crtc_mask(crtc)) { - DRM_DEBUG_KMS("Cannot change primary plane CRTC\n"); - return -EINVAL; - } - - /* Disallow scaling */ - if (crtc_w != src_w || crtc_h != src_h) { - DRM_DEBUG_KMS("Can't scale primary plane\n"); - return -EINVAL; - } - - /* Make sure primary plane covers entire CRTC */ - drm_rect_intersect(&dest, &clip); - if (dest.x1 != 0 || dest.y1 != 0 || - dest.x2 != crtc->mode.hdisplay || dest.y2 != crtc->mode.vdisplay) { - DRM_DEBUG_KMS("Primary plane must cover entire CRTC\n"); - return -EINVAL; - } - - /* Framebuffer must be big enough to cover entire plane */ - ret = drm_crtc_check_viewport(crtc, crtc_x, crtc_y, &crtc->mode, fb); + ret = drm_plane_helper_check_update(plane, crtc, fb, + &src, &dest, &clip, + DRM_PLANE_HELPER_NO_SCALING, + DRM_PLANE_HELPER_NO_SCALING, + false, false, &visible); if (ret) return ret; + if (!visible) + /* + * Primary plane isn't visible. Note that unless a driver + * provides their own disable function, this will just + * wind up returning -EINVAL to userspace. + */ + return plane->funcs->disable_plane(plane); + /* Find current connectors for CRTC */ num_connectors = get_connectors_for_crtc(crtc, NULL, 0); BUG_ON(num_connectors == 0); @@ -176,21 +244,14 @@ int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc, set.num_connectors = num_connectors; /* - * set_config() adjusts crtc->primary->fb; however the DRM setplane - * code that called us expects to handle the framebuffer update and - * reference counting; save and restore the current fb before - * calling it. - * - * N.B., we call set_config() directly here rather than using + * We call set_config() directly here rather than using * drm_mode_set_config_internal. We're reprogramming the same * connectors that were already in use, so we shouldn't need the extra * cross-CRTC fb refcounting to accomodate stealing connectors. * drm_mode_setplane() already handles the basic refcounting for the * framebuffers involved in this operation. */ - tmpfb = plane->fb; ret = crtc->funcs->set_config(&set); - plane->fb = tmpfb; kfree(connector_list); return ret; @@ -232,7 +293,6 @@ EXPORT_SYMBOL(drm_primary_helper_disable); */ void drm_primary_helper_destroy(struct drm_plane *plane) { - plane->funcs->disable_plane(plane); drm_plane_cleanup(plane); kfree(plane); } |