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 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2587ACDB471 for ; Tue, 23 Jun 2026 20:51:19 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 7D11E10E2E9; Tue, 23 Jun 2026 20:51:18 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="PgHGa1mW"; dkim-atps=neutral Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id D94AA10E2E9 for ; Tue, 23 Jun 2026 20:51:16 +0000 (UTC) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id B091B406C8; Tue, 23 Jun 2026 20:51:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4FF271F000E9; Tue, 23 Jun 2026 20:51:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782247876; bh=ayLBPgvBZ3FBSH7Pyg9Se35v0qo5SoF/f3h+0edTIOc=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=PgHGa1mWVDgmJeRoTarYse9R6uCsdNs2BYML/311fxFc7KuMSo7DEIm89416wLOf9 hWA8POFRNSACPm/nUrv1yTvQrrcsy1eAsugPXaaGtDuV2GXgiinEx22vvbZUJxhlJz kY6Gv/fvpAzoLpH4iP8/cjs+lQRAOK2wsD/+oKBZGBr/lPbzHGN613PcS172IQu3AD bGSNKK3kbtGFGpCEgBaNCryLBWsjffybQzACWefaoUYiyBb+uQqsrBNZOj8/kzBvPb q6YUe6ji01pFLIoklfpEGKTFqY9bE/rtFeWJxIAehteh9LFf647nOXS5EsAHHIQRUo aQcaXzoilI4jw== From: sashiko-bot@kernel.org Subject: Re: [PATCH 7/9] drm/rockchip: dw_hdmi_qp: Support 10-bit YUV422 output format To: "Cristian Ciocaltea" Cc: robh@kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, conor+dt@kernel.org In-Reply-To: <20260617-dw-hdmi-qp-yuv-v1-7-a665cfd06d7d@collabora.com> References: <20260617-dw-hdmi-qp-yuv-v1-0-a665cfd06d7d@collabora.com> <20260617-dw-hdmi-qp-yuv-v1-7-a665cfd06d7d@collabora.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Tue, 23 Jun 2026 20:51:15 +0000 Message-Id: <20260623205116.4FF271F000E9@smtp.kernel.org> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: sashiko-reviews@lists.linux.dev Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Thank you for your contribution! Sashiko AI review found 1 potential issue(= s) to consider: Pre-existing issues: - [High] Mutating hardware state and global device tracking variables insid= e an atomic_check callback. -- commit ee5f0003f61d5c3a78b5bc65346f39307471c74c Author: Cristian Ciocaltea drm/rockchip: dw_hdmi_qp: Support 10-bit YUV422 output format This commit adds support for the 10-bit YUV 4:2:2 output format (MEDIA_BUS_FMT_UYVY10_1X20) to the Rockchip DW HDMI QP encoder. It also forces 8 bpc when YUV 4:2:2 is in use to ensure the PHY PLL output remains aligned with the TMDS character rate. > diff --git a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c b/drivers/gpu= /drm/rockchip/dw_hdmi_qp-rockchip.c > --- a/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c > +++ b/drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c [ ... ] > @@ -227,7 +228,14 @@ dw_hdmi_qp_rockchip_encoder_atomic_check(struct drm_= encoder *encoder, > } > =20 > phy_cfg.hdmi.tmds_char_rate =3D conn_state->hdmi.tmds_char_rate; > - phy_cfg.hdmi.bpc =3D conn_state->hdmi.output_bpc; > + /* > + * YUV422 always transmits two 12-bit components per clock cycle, > + * regardless of the color depth, which from a rate perspective is > + * equivalent to three 8-bit RGB components. Force 8 bpc here to > + * keep the PHY PLL output aligned with the TMDS character rate. > + */ > + phy_cfg.hdmi.bpc =3D (s->output_mode =3D=3D ROCKCHIP_OUT_MODE_YUV422 ? > + 8 : conn_state->hdmi.output_bpc); > =20 > ret =3D phy_configure(hdmi->phy, &phy_cfg); > if (!ret) { > hdmi->tmds_char_rate =3D conn_state->hdmi.tmds_char_rate; > s->output_type =3D DRM_MODE_CONNECTOR_HDMIA; > s->output_bpc =3D conn_state->hdmi.output_bpc; > s->bus_format =3D ingest_fmt; > } else { [Severity: High] This is a pre-existing issue, but does dw_hdmi_qp_rockchip_encoder_atomic_check() mutate hardware state and global tracking variables during an atomic check? In the DRM atomic framework, the atomic_check phase is expected to be side-effect free. However, this code calls phy_configure(), which writes directly to the PHY hardware registers, and then modifies the global hdmi->tmds_char_rate variable. Could this corrupt the active display configuration if userspace performs a DRM_MODE_ATOMIC_TEST_ONLY commit or if an atomic commit fails a later validation stage? Furthermore, if the device is runtime-suspended, could accessing unclocked hardware registers here trigger a synchronous abort and hang the system? --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20260617-dw-hdmi-qp= -yuv-v1-0-a665cfd06d7d@collabora.com?part=3D7