[PATCH 2/4] drm/plane-helper: Add drm_plane_helper_check_update() (v3)
Pull the parameter checking from drm_primary_helper_update() out into its own function; drivers that provide their own setplane() implementations rather than using the helper may still want to share this parameter checking logic. A few of the checks here were also updated based on suggestions by Ville Syrj?l?. v3: - s/primary_helper/plane_helper/ --- this checking logic may be useful for other types of planes as well. - Fix visibility check (need to dereference visibility pointer) v2: - Pass src/dest/clip rects and min/max scaling down to helper to avoid duplication of effort between helper and drivers (suggested by Ville). - Allow caller to specify whether the primary plane should be updatable while the crtc is disabled. Cc: dri-devel at lists.freedesktop.org Reviewed-by: Chon Ming Lee Signed-off-by: Matt Roper --- drivers/gpu/drm/drm_plane_helper.c | 124 - include/drm/drm_plane_helper.h | 22 +++ 2 files changed, 116 insertions(+), 30 deletions(-) diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c index b601233..fd401fc 100644 --- a/drivers/gpu/drm/drm_plane_helper.c +++ b/drivers/gpu/drm/drm_plane_helper.c @@ -66,6 +66,79 @@ 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 @@ -113,51 +186,42 @@ 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 +
[PATCH 2/4] drm/plane-helper: Add drm_plane_helper_check_update() (v3)
Pull the parameter checking from drm_primary_helper_update() out into its own function; drivers that provide their own setplane() implementations rather than using the helper may still want to share this parameter checking logic. A few of the checks here were also updated based on suggestions by Ville Syrj?l?. v3: - s/primary_helper/plane_helper/ --- this checking logic may be useful for other types of planes as well. - Fix visibility check (need to dereference visibility pointer) v2: - Pass src/dest/clip rects and min/max scaling down to helper to avoid duplication of effort between helper and drivers (suggested by Ville). - Allow caller to specify whether the primary plane should be updatable while the crtc is disabled. Cc: Ville Syrj?l? Cc: dri-devel at lists.freedesktop.org Signed-off-by: Matt Roper --- drivers/gpu/drm/drm_plane_helper.c | 124 - include/drm/drm_plane_helper.h | 22 +++ 2 files changed, 116 insertions(+), 30 deletions(-) diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c index a255bea..83c8f0b 100644 --- a/drivers/gpu/drm/drm_plane_helper.c +++ b/drivers/gpu/drm/drm_plane_helper.c @@ -67,6 +67,79 @@ 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 @@ -114,51 +187,42 @@ 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,