[PATCH v3 4/4] drm/i915: Implement proper clipping for video sprites
ville.syrjala at linux.intel.com
ville.syrjala at linux.intel.com
Wed Mar 27 08:46:25 PDT 2013
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
Properly clip the source when the destination gets clipped
by the pipe dimensions.
Sadly the video sprite hardware is rather limited so it can't do proper
sub-pixel postitioning. Resort to truncating the source coordinates to
(macro)pixel boundary.
The scaling checks are done using the relaxed drm_region functions.
That means that the src/dst regions are reduced in size in order to keep
the scaling factor within the limits.
Also do some additional checking against various hardware limits.
v2: Truncate src coords instead of rounding to avoid increasing src
viewport size, and adapt to changes in drm_calc_{h,v}scale().
v3: Adapt to drm_region->drm_rect rename. Fix misaligned crtc_w for
packed YUV formats when scaling isn't supported.
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/i915/intel_sprite.c | 191 +++++++++++++++++++++++++++---------
1 file changed, 145 insertions(+), 46 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 414d325..62e09d1 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -32,6 +32,7 @@
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fourcc.h>
+#include <drm/drm_rect.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
@@ -415,6 +416,20 @@ ilk_get_colorkey(struct drm_plane *plane, struct drm_intel_sprite_colorkey *key)
key->flags = I915_SET_COLORKEY_NONE;
}
+static bool
+format_is_yuv(uint32_t format)
+{
+ switch (format) {
+ case DRM_FORMAT_YUYV:
+ case DRM_FORMAT_UYVY:
+ case DRM_FORMAT_VYUY:
+ case DRM_FORMAT_YVYU:
+ return true;
+ default:
+ return false;
+ }
+}
+
static int
intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
struct drm_framebuffer *fb, int crtc_x, int crtc_y,
@@ -432,9 +447,28 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
enum transcoder cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv,
pipe);
int ret = 0;
- int x = src_x >> 16, y = src_y >> 16;
int primary_w = crtc->mode.hdisplay, primary_h = crtc->mode.vdisplay;
bool disable_primary = false;
+ bool visible;
+ int hscale, vscale;
+ int max_scale, min_scale;
+ int pixel_size = drm_format_plane_cpp(fb->pixel_format, 0);
+ struct drm_rect src = {
+ .x1 = src_x,
+ .x2 = src_x + src_w,
+ .y1 = src_y,
+ .y2 = src_y + src_h,
+ };
+ struct drm_rect dst = {
+ .x1 = crtc_x,
+ .x2 = crtc_x + crtc_w,
+ .y1 = crtc_y,
+ .y2 = crtc_y + crtc_h,
+ };
+ const struct drm_rect clip = {
+ .x2 = crtc->mode.hdisplay,
+ .y2 = crtc->mode.vdisplay,
+ };
intel_fb = to_intel_framebuffer(fb);
obj = intel_fb->obj;
@@ -450,19 +484,23 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
intel_plane->src_w = src_w;
intel_plane->src_h = src_h;
- src_w = src_w >> 16;
- src_h = src_h >> 16;
-
/* Pipe must be running... */
- if (!(I915_READ(PIPECONF(cpu_transcoder)) & PIPECONF_ENABLE))
- return -EINVAL;
-
- if (crtc_x >= primary_w || crtc_y >= primary_h)
+ if (!(I915_READ(PIPECONF(cpu_transcoder)) & PIPECONF_ENABLE)) {
+ DRM_DEBUG_KMS("Pipe disabled\n");
return -EINVAL;
+ }
/* Don't modify another pipe's plane */
- if (intel_plane->pipe != intel_crtc->pipe)
+ if (intel_plane->pipe != intel_crtc->pipe) {
+ DRM_DEBUG_KMS("Wrong plane <-> crtc mapping\n");
return -EINVAL;
+ }
+
+ /* FIXME check all gen limits */
+ if (fb->width < 3 || fb->height < 3 || fb->pitches[0] > 16384) {
+ DRM_DEBUG_KMS("Unsuitable framebuffer for plane\n");
+ return -EINVAL;
+ }
/* Sprite planes can be linear or x-tiled surfaces */
switch (obj->tiling_mode) {
@@ -470,53 +508,111 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
case I915_TILING_X:
break;
default:
+ DRM_DEBUG_KMS("Unsupported tiling mode\n");
return -EINVAL;
}
/*
- * Clamp the width & height into the visible area. Note we don't
- * try to scale the source if part of the visible region is offscreen.
- * The caller must handle that by adjusting source offset and size.
+ * FIXME the following code does a bunch of fuzzy adjustments to the
+ * coordinates and sizes. We probably need some way to decide whether
+ * more strict checking should be done instead.
*/
- if ((crtc_x < 0) && ((crtc_x + crtc_w) > 0)) {
- crtc_w += crtc_x;
- crtc_x = 0;
+ max_scale = intel_plane->max_downscale << 16;
+ min_scale = intel_plane->can_scale ? 1 : (1 << 16);
+
+ hscale = drm_rect_calc_hscale_relaxed(&src, &dst, min_scale, max_scale);
+ BUG_ON(hscale < 0);
+
+ vscale = drm_rect_calc_vscale_relaxed(&src, &dst, min_scale, max_scale);
+ BUG_ON(vscale < 0);
+
+ visible = drm_rect_clip_scaled(&src, &dst, &clip, hscale, vscale);
+
+ if (visible) {
+ /* check again in case clipping clamped the results */
+ hscale = drm_rect_calc_hscale(&src, &dst, min_scale, max_scale);
+ if (hscale < 0) {
+ DRM_DEBUG_KMS("Horizontal scaling factor out of limits\n");
+ drm_rect_debug_print(&src, true);
+ drm_rect_debug_print(&dst, false);
+ return hscale;
+ }
+
+ vscale = drm_rect_calc_vscale(&src, &dst, min_scale, max_scale);
+ if (vscale < 0) {
+ DRM_DEBUG_KMS("Vertical scaling factor out of limits\n");
+ drm_rect_debug_print(&src, true);
+ drm_rect_debug_print(&dst, false);
+ return vscale;
+ }
+
+ /* Make the source viewport size an exact multiple of the scaling factors. */
+ drm_rect_adjust_size(&src,
+ drm_rect_width(&dst) * hscale - drm_rect_width(&src),
+ drm_rect_height(&dst) * vscale - drm_rect_height(&src));
+
+ crtc_x = dst.x1;
+ crtc_y = dst.y1;
+ crtc_w = drm_rect_width(&dst);
+ crtc_h = drm_rect_height(&dst);
+
+ /*
+ * Hardware doesn't handle subpixel coordinates.
+ * Adjust to (macro)pixel boundary, but be careful not to
+ * increase the source viewport size, because that could
+ * push the downscaling factor out of bounds.
+ */
+ src_x = src.x1 >> 16;
+ src_w = drm_rect_width(&src) >> 16;
+ src_y = src.y1 >> 16;
+ src_h = drm_rect_height(&src) >> 16;
+
+ if (format_is_yuv(fb->pixel_format)) {
+ src_x &= ~1;
+ src_w &= ~1;
+
+ /*
+ * Must keep src and dst the
+ * same if we can't scale.
+ */
+ if (!intel_plane->can_scale)
+ crtc_w &= ~1;
+ }
}
- if ((crtc_x + crtc_w) <= 0) /* Nothing to display */
- goto out;
- if ((crtc_x + crtc_w) > primary_w)
- crtc_w = primary_w - crtc_x;
-
- if ((crtc_y < 0) && ((crtc_y + crtc_h) > 0)) {
- crtc_h += crtc_y;
- crtc_y = 0;
+
+ /* Account for minimum size when scaling */
+ if (visible && (src_w != crtc_w || src_h != crtc_h)) {
+ BUG_ON(!intel_plane->can_scale);
+
+ /* FIXME interlacing min height is 6 */
+ /* FIXME return an error instead? */
+
+ if (crtc_w < 3 || crtc_h < 3)
+ visible = false;
+
+ if (src_w < 3 || src_h < 3)
+ visible = false;
}
- if ((crtc_y + crtc_h) <= 0) /* Nothing to display */
- goto out;
- if (crtc_y + crtc_h > primary_h)
- crtc_h = primary_h - crtc_y;
- if (!crtc_w || !crtc_h) /* Again, nothing to display */
- goto out;
+ /* Check size restrictions when scaling */
+ if (visible && (src_w != crtc_w || src_h != crtc_h)) {
+ unsigned int width_bytes = ((src_x * pixel_size) & 63) + src_w * pixel_size;
- /*
- * We may not have a scaler, eg. HSW does not have it any more
- */
- if (!intel_plane->can_scale && (crtc_w != src_w || crtc_h != src_h))
- return -EINVAL;
+ BUG_ON(!intel_plane->can_scale);
- /*
- * We can take a larger source and scale it down, but
- * only so much... 16x is the max on SNB.
- */
- if (((src_w * src_h) / (crtc_w * crtc_h)) > intel_plane->max_downscale)
- return -EINVAL;
+ if (src_w > 2048 || src_h > 2048 ||
+ width_bytes > 4096 || fb->pitches[0] > 4096) {
+ DRM_DEBUG_KMS("Source dimensions exceed hardware limits\n");
+ return -EINVAL;
+ }
+ }
/*
* If the sprite is completely covering the primary plane,
* we can disable the primary and save power.
*/
- if ((crtc_x == 0) && (crtc_y == 0) &&
+ if (visible &&
+ (crtc_x == 0) && (crtc_y == 0) &&
(crtc_w == primary_w) && (crtc_h == primary_h))
disable_primary = true;
@@ -540,11 +636,15 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
if (!disable_primary)
intel_enable_primary(crtc);
- intel_plane->update_plane(plane, fb, obj, crtc_x, crtc_y,
- crtc_w, crtc_h, x, y, src_w, src_h);
+ if (visible) {
+ intel_plane->update_plane(plane, fb, obj,
+ crtc_x, crtc_y, crtc_w, crtc_h,
+ src_x, src_y, src_w, src_h);
- if (disable_primary)
- intel_disable_primary(crtc);
+ if (disable_primary)
+ intel_disable_primary(crtc);
+ } else
+ intel_plane->disable_plane(plane);
/* Unpin old obj after new one is active to avoid ugliness */
if (old_obj) {
@@ -564,7 +664,6 @@ intel_update_plane(struct drm_plane *plane, struct drm_crtc *crtc,
out_unlock:
mutex_unlock(&dev->struct_mutex);
-out:
return ret;
}
--
1.8.1.5
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