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drm/ingenic: ipu: Search for scaling coefs up to 102% of the screen
Increase the scaled image's theorical width/height until we find a configuration that has valid scaling coefficients, up to 102% of the screen's resolution. This makes sure that we can scale from almost every resolution possible at the cost of a very small distorsion. The CRTC_W / CRTC_H are not modified. This algorithm was already in place but would not try to go above the screen's resolution, and as a result would only work if the CRTC_W / CRTC_H were smaller than the screen resolution. It will now try until it reaches 102% of the screen's resolution. Note that this algorithm exists mostly as a band-aid for a missing functionality: it is not possible for userspace to request the closest mode that would encapsulate the provided one, because the GEM buffer is created beforehand. If there was a way to let the kernel tweak the mode, I could write a better algorithm that would result in a better looking picture. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Acked-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20201105083905.8780-1-paul@crapouillou.net
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@ -516,7 +516,7 @@ static void ingenic_ipu_plane_atomic_update(struct drm_plane *plane,
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static int ingenic_ipu_plane_atomic_check(struct drm_plane *plane,
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struct drm_plane_state *state)
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{
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unsigned int num_w, denom_w, num_h, denom_h, xres, yres;
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unsigned int num_w, denom_w, num_h, denom_h, xres, yres, max_w, max_h;
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struct ingenic_ipu *ipu = plane_to_ingenic_ipu(plane);
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struct drm_crtc *crtc = state->crtc ?: plane->state->crtc;
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struct drm_crtc_state *crtc_state;
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@ -558,19 +558,26 @@ static int ingenic_ipu_plane_atomic_check(struct drm_plane *plane,
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xres = state->src_w >> 16;
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yres = state->src_h >> 16;
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/* Adjust the coefficients until we find a valid configuration */
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for (denom_w = xres, num_w = state->crtc_w;
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num_w <= crtc_state->mode.hdisplay; num_w++)
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/*
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* Increase the scaled image's theorical width/height until we find a
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* configuration that has valid scaling coefficients, up to 102% of the
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* screen's resolution. This makes sure that we can scale from almost
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* every resolution possible at the cost of a very small distorsion.
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* The CRTC_W / CRTC_H are not modified.
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*/
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max_w = crtc_state->mode.hdisplay * 102 / 100;
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max_h = crtc_state->mode.vdisplay * 102 / 100;
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for (denom_w = xres, num_w = state->crtc_w; num_w <= max_w; num_w++)
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if (!reduce_fraction(&num_w, &denom_w))
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break;
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if (num_w > crtc_state->mode.hdisplay)
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if (num_w > max_w)
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return -EINVAL;
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for (denom_h = yres, num_h = state->crtc_h;
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num_h <= crtc_state->mode.vdisplay; num_h++)
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for (denom_h = yres, num_h = state->crtc_h; num_h <= max_h; num_h++)
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if (!reduce_fraction(&num_h, &denom_h))
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break;
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if (num_h > crtc_state->mode.vdisplay)
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if (num_h > max_h)
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return -EINVAL;
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ipu->num_w = num_w;
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