From nobody Fri Sep 20 15:19:31 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8B186C001DC for ; Mon, 17 Jul 2023 14:14:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232149AbjGQOO4 (ORCPT ); Mon, 17 Jul 2023 10:14:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42264 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232139AbjGQOOw (ORCPT ); Mon, 17 Jul 2023 10:14:52 -0400 Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2EBE01A2 for ; Mon, 17 Jul 2023 07:14:46 -0700 (PDT) Received: from IcarusMOD.eternityproject.eu (2-237-20-237.ip236.fastwebnet.it [2.237.20.237]) (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 madras.collabora.co.uk (Postfix) with ESMTPSA id A4BF16607014; Mon, 17 Jul 2023 15:14:43 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1689603284; bh=9oUBdhJxcjM5c8eCCSSOcqllo9ke9sPNjeRntNkLNoM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TeYzdmgz451EjrdZo/zdtYmOyZJdAqLoIhaELRWmIqur4GlMcs3zKmEo90E72X8Ty 3HVRCAt2HIi3mYzFGcG808hwhyH2r3PVBb78RQ8gRjoOzHlNdFReAc1xMiudCTe3ph 1tFbXQLW3OpziaEM8CIatOvs/QJerwnhFza1tA4RtdQ9cc/yOA621C+xxGk7ztRUpe /wYMEc7oK6M0TRiPp8Bk2ds0C7RBLmpaGKd/iC0iFjt/KsJvWCG+ugSc8g4P3wNo6d u5vQfYYh7hc3HDfWv53eyb+5WwQzF+Km0k0CZZaaoZncB246/sYKB8FAvAYiqRc8+k mCnkzDomm7B4Q== 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, 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, nfraprado@collabora.com Subject: [PATCH v6 01/11] drm/mediatek: dp: Add missing error checks in mtk_dp_parse_capabilities Date: Mon, 17 Jul 2023 16:14:28 +0200 Message-Id: <20230717141438.274419-2-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230717141438.274419-1-angelogioacchino.delregno@collabora.com> References: <20230717141438.274419-1-angelogioacchino.delregno@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" If reading the RX capabilities fails the training pattern will be set wrongly: add error checking for drm_dp_read_dpcd_caps() and return if anything went wrong with it. While at it, also add a less critical error check when writing to clear the ESI0 IRQ vector. Fixes: f70ac097a2cf ("drm/mediatek: Add MT8195 Embedded DisplayPort driver") Signed-off-by: AngeloGioacchino Del Regno Reviewed-by: Alexandre Mergnat --- drivers/gpu/drm/mediatek/mtk_dp.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/m= tk_dp.c index 64eee77452c0..c58b775877a3 100644 --- a/drivers/gpu/drm/mediatek/mtk_dp.c +++ b/drivers/gpu/drm/mediatek/mtk_dp.c @@ -1588,7 +1588,9 @@ static int mtk_dp_parse_capabilities(struct mtk_dp *m= tk_dp) u8 val; ssize_t ret; =20 - drm_dp_read_dpcd_caps(&mtk_dp->aux, mtk_dp->rx_cap); + ret =3D drm_dp_read_dpcd_caps(&mtk_dp->aux, mtk_dp->rx_cap); + if (ret < 0) + return ret; =20 if (drm_dp_tps4_supported(mtk_dp->rx_cap)) mtk_dp->train_info.channel_eq_pattern =3D DP_TRAINING_PATTERN_4; @@ -1615,10 +1617,13 @@ static int mtk_dp_parse_capabilities(struct mtk_dp = *mtk_dp) return ret =3D=3D 0 ? -EIO : ret; } =20 - if (val) - drm_dp_dpcd_writeb(&mtk_dp->aux, - DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0, - val); + if (val) { + ret =3D drm_dp_dpcd_writeb(&mtk_dp->aux, + DP_DEVICE_SERVICE_IRQ_VECTOR_ESI0, + val); + if (ret < 0) + return ret; + } } =20 return 0; --=20 2.40.1