On Wed, Nov 18, 2015 at 06:37:17PM +0530, Maiti, Nabendu Bikash wrote:
>
>
> On 11/18/2015 5:41 PM, Ville Syrjälä wrote:
> > On Wed, Nov 18, 2015 at 05:13:01PM +0530, Nabendu Maiti wrote:
> >> On older platforms scalers/cliping used to provide destination size an
> >> exact multiple of src size.
> >> Gen-9 and above support fractional ratio of dst/src so that source is
> >> not manipulated to meet the exact multiple factor.
> >>
> >> Signed-off-by: Nabendu Maiti <nabendu.bikash.ma...@intel.com>
> >> ---
> >> drivers/gpu/drm/i915/intel_sprite.c | 48
> >> +++++++++++++++++++++----------------
> >> 1 file changed, 28 insertions(+), 20 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/intel_sprite.c
> >> b/drivers/gpu/drm/i915/intel_sprite.c
> >> index 2b96f33..e8c17ae 100644
> >> --- a/drivers/gpu/drm/i915/intel_sprite.c
> >> +++ b/drivers/gpu/drm/i915/intel_sprite.c
> >> @@ -813,29 +813,37 @@ intel_check_sprite_plane(struct drm_plane *plane,
> >> crtc_h = drm_rect_height(dst);
> >>
> >> if (state->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: ", src, true);
> >> - drm_rect_debug_print("dst: ", 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: ", src, true);
> >> - drm_rect_debug_print("dst: ", dst, false);
> >> + /* Gen 9 and above has fractional scaling support */
> >> + if (INTEL_INFO(plane->dev)->gen < 9) {
> >>
> >> - return vscale;
> >> - }
> >> + /* 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: ", src, true);
> >> + drm_rect_debug_print("dst: ", 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: ", src, true);
> >> + drm_rect_debug_print("dst: ", dst, false);
> >>
> >> - /* 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));
> >> + 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));
> >> + }
> > NAK. This code just makes sure the actual scaling ratio matches what we
> > calculated. As in there may have been some amount of rounding involved
> > etc.
> >
> > The part you actually want to change is what comes after this where we
> > throw away the fractional part of the coordinates. And then you need to
> > change the actual hw programming so that we actually feed the sub-pixel
> > coordinates to the hardware.
>
> In line
>
> drm_rect_adjust_size(src,
> + drm_rect_width(dst) * hscale -
> drm_rect_width(src),
> + drm_rect_height(dst) * vscale -
> drm_rect_height(src));
>
> I think we throw away the fractional part,
No, we don't.
> which modifies the src,rectangle. In commit we use the modified state->src
> size.
>
> >>
> >> drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16,
> >> state->base.rotation);
> >> --
> >> 1.9.1
> >>
> >> _______________________________________________
> >> Intel-gfx mailing list
> >> Intel-gfx@lists.freedesktop.org
> >> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel OTC
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