From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 31F1AC00A89 for ; Thu, 5 Nov 2020 08:39:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C3C9C2080D for ; Thu, 5 Nov 2020 08:39:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729893AbgKEIjS (ORCPT ); Thu, 5 Nov 2020 03:39:18 -0500 Received: from aposti.net ([89.234.176.197]:41310 "EHLO aposti.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727114AbgKEIjR (ORCPT ); Thu, 5 Nov 2020 03:39:17 -0500 From: Paul Cercueil To: David Airlie , Daniel Vetter Cc: Sam Ravnborg , od@zcrc.me, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Paul Cercueil Subject: [PATCH] drm/ingenic: ipu: Search for scaling coefs up to 102% of the screen Date: Thu, 5 Nov 2020 08:39:05 +0000 Message-Id: <20201105083905.8780-1-paul@crapouillou.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Signed-off-by: Paul Cercueil --- drivers/gpu/drm/ingenic/ingenic-ipu.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/ingenic/ingenic-ipu.c b/drivers/gpu/drm/ingenic/ingenic-ipu.c index fc8c6e970ee3..e52777ef85fd 100644 --- a/drivers/gpu/drm/ingenic/ingenic-ipu.c +++ b/drivers/gpu/drm/ingenic/ingenic-ipu.c @@ -516,7 +516,7 @@ static void ingenic_ipu_plane_atomic_update(struct drm_plane *plane, static int ingenic_ipu_plane_atomic_check(struct drm_plane *plane, struct drm_plane_state *state) { - unsigned int num_w, denom_w, num_h, denom_h, xres, yres; + unsigned int num_w, denom_w, num_h, denom_h, xres, yres, max_w, max_h; struct ingenic_ipu *ipu = plane_to_ingenic_ipu(plane); struct drm_crtc *crtc = state->crtc ?: plane->state->crtc; struct drm_crtc_state *crtc_state; @@ -558,19 +558,26 @@ static int ingenic_ipu_plane_atomic_check(struct drm_plane *plane, xres = state->src_w >> 16; yres = state->src_h >> 16; - /* Adjust the coefficients until we find a valid configuration */ - for (denom_w = xres, num_w = state->crtc_w; - num_w <= crtc_state->mode.hdisplay; num_w++) + /* + * 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. + */ + max_w = crtc_state->mode.hdisplay * 102 / 100; + max_h = crtc_state->mode.vdisplay * 102 / 100; + + for (denom_w = xres, num_w = state->crtc_w; num_w <= max_w; num_w++) if (!reduce_fraction(&num_w, &denom_w)) break; - if (num_w > crtc_state->mode.hdisplay) + if (num_w > max_w) return -EINVAL; - for (denom_h = yres, num_h = state->crtc_h; - num_h <= crtc_state->mode.vdisplay; num_h++) + for (denom_h = yres, num_h = state->crtc_h; num_h <= max_h; num_h++) if (!reduce_fraction(&num_h, &denom_h)) break; - if (num_h > crtc_state->mode.vdisplay) + if (num_h > max_h) return -EINVAL; ipu->num_w = num_w; -- 2.28.0