From nobody Fri Sep 20 01:43:22 2024 Received: from madrid.collaboradmins.com (madrid.collaboradmins.com [46.235.227.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B85BC45970 for ; Thu, 4 Apr 2024 07:58:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=46.235.227.194 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712217482; cv=none; b=XxtHmw9daQYDGU+ifTpR1shhNVgMeUxqXgph/Yx8cuk+H3PL7awD2OPjkkR4V7auhU2j/hi9jFll6fDWrgI34lIyBDUMZ9NKzyF2o1prCLK+5c0BgxccGzSC6/DHoEOqdINC7Fp3F/6lFlL91WPRbE0gXg4gRxJyn7vfTYmyDIs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712217482; c=relaxed/simple; bh=3XsaGUfHbyKfT+rCEWbrx+o2Wnvb76/WaYQW9y+coRI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qAu2neUdWapmD+QHctNbmuorpkC0JXuvVwW3Qo/xWTIyiDCDU+ktZ/gGrYO380jO5VYlXSf6NsTCN3HPw46lPe0h404LgjJM+u/3JW/6TYO/yVrQU2k9nsshRzxqKV/ifIqwlszlgmlwt1TuzmNvIjWv2XglHkZQHsK+0SMO4uI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com; spf=pass smtp.mailfrom=collabora.com; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b=tRqKoJZl; arc=none smtp.client-ip=46.235.227.194 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=collabora.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=collabora.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=collabora.com header.i=@collabora.com header.b="tRqKoJZl" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1712217478; bh=3XsaGUfHbyKfT+rCEWbrx+o2Wnvb76/WaYQW9y+coRI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tRqKoJZlIxZCuMghnJ/64FPr6v7Kq9trDuOiSl5+ST70yRVIqMOpQUzo9rk1ytADO Mc6efyeeN63rIgSnWFjRK1W1DSVy9Ig9fRjhOjrHYTvcMxSjREfg1lPEuSvHe/X8e/ vzIH9xzDCr/w5WDlqqNz+glf5Qh3hnmlwchOOAD5uXpcPQzl5Nr3wVyPYDKxMCsKRT AchEv+JZn5F3BcPZvSurhFjyx7czK21qlkLK02/oLqQee9B0ev9sutFvTb98cJcmKU /UqavQB0ohBcigEXOodwim/BkqpbA4zpUmV/3+QH9qg+TT1yXYPMA9AhPxeBy8707B X1DO/Jfq7b5Qg== Received: from IcarusMOD.eternityproject.eu (cola.collaboradmins.com [195.201.22.229]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madrid.collaboradmins.com (Postfix) with ESMTPSA id F3D663782128; Thu, 4 Apr 2024 07:57:57 +0000 (UTC) From: AngeloGioacchino Del Regno To: chunkuang.hu@kernel.org Cc: p.zabel@pengutronix.de, airlied@gmail.com, daniel@ffwll.ch, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, ck.hu@mediatek.com, nancy.lin@mediatek.com, nathan.lu@mediatek.com, dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@collabora.com, wenst@chromium.org Subject: [PATCH v2 1/3] drm/mediatek: drm_ddp_comp: Fix and cleanup DDP component CRTC search Date: Thu, 4 Apr 2024 09:57:52 +0200 Message-ID: <20240404075754.83455-2-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240404075754.83455-1-angelogioacchino.delregno@collabora.com> References: <20240404075754.83455-1-angelogioacchino.delregno@collabora.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Finding a possible CRTC by DDP component is done by first checking static routes in three paths (main, external, third/extra path) and then, if not found, we check for dynamic connection on a per-route basis because, for example, on some SoCs the main route may output to either a DSI display or DisplayPort and this is finally done by assigning a CRTC mask to `possible_crtcs`, found with function mtk_drm_find_comp_in_ddp_conn_path(): being that a mask the possible values are BIT(x) and, if no CRTC is possible, zero. Problem is, both mtk_drm_find_possible_crtc_by_comp() and the aforementioned function are trying to return a negative error value (but it's unsigned int, so the value is never negative!) if no CRTC was found, which is wrong for multiple obvious reasons. Cleanup both functions, so that: - mtk_drm_find_comp_in_ddp_conn_path() returns a signed integer with a negative number for error, or a bit/bitmask of the found possible CRTC; and - mtk_drm_find_possible_crtc_by_comp() always returns either a bitmask of the possible CRTC, or zero if none available. Fixes: 01389b324c97 ("drm/mediatek: Add connector dynamic selection capabil= ity") Signed-off-by: AngeloGioacchino Del Regno --- drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 44 ++++++++++----------- 1 file changed, 21 insertions(+), 23 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/= mediatek/mtk_drm_ddp_comp.c index a515e96cfefc..82d7a6887f44 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c @@ -514,29 +514,25 @@ static bool mtk_drm_find_comp_in_ddp(struct device *d= ev, return false; } =20 -static unsigned int mtk_drm_find_comp_in_ddp_conn_path(struct device *dev, - const struct mtk_drm_route *routes, - unsigned int num_routes, - struct mtk_ddp_comp *ddp_comp) +static int mtk_drm_find_comp_in_ddp_conn_path(struct device *dev, + const struct mtk_drm_route *routes, + unsigned int num_routes, + struct mtk_ddp_comp *ddp_comp) { - int ret; - unsigned int i; + int i; =20 - if (!routes) { - ret =3D -EINVAL; - goto err; + if (!routes || !num_routes) { + DRM_ERROR("No connection routes specified!\n"); + return -EINVAL; } =20 for (i =3D 0; i < num_routes; i++) if (dev =3D=3D ddp_comp[routes[i].route_ddp].dev) return BIT(routes[i].crtc_id); =20 - ret =3D -ENODEV; -err: - - DRM_INFO("Failed to find comp in ddp table, ret =3D %d\n", ret); + DRM_ERROR("Failed to find component in ddp table\n"); =20 - return 0; + return -ENODEV; } =20 int mtk_ddp_comp_get_id(struct device_node *node, @@ -558,22 +554,24 @@ unsigned int mtk_drm_find_possible_crtc_by_comp(struc= t drm_device *drm, struct device *dev) { struct mtk_drm_private *private =3D drm->dev_private; - unsigned int ret =3D 0; + int ret; =20 if (mtk_drm_find_comp_in_ddp(dev, private->data->main_path, private->data= ->main_len, private->ddp_comp)) - ret =3D BIT(0); + return BIT(0); else if (mtk_drm_find_comp_in_ddp(dev, private->data->ext_path, private->data->ext_len, private->ddp_comp)) - ret =3D BIT(1); + return BIT(1); else if (mtk_drm_find_comp_in_ddp(dev, private->data->third_path, private->data->third_len, private->ddp_comp)) - ret =3D BIT(2); - else - ret =3D mtk_drm_find_comp_in_ddp_conn_path(dev, - private->data->conn_routes, - private->data->num_conn_routes, - private->ddp_comp); + return BIT(2); + + ret =3D mtk_drm_find_comp_in_ddp_conn_path(dev, private->data->conn_route= s, + private->data->num_conn_routes, + private->ddp_comp); + /* No CRTC is available: return a zero mask */ + if (ret < 0) + return 0; =20 return ret; } --=20 2.44.0