From patchwork Tue Feb 11 07:46:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gwan-gyeong Mun X-Patchwork-Id: 11374971 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 136E617F0 for ; Tue, 11 Feb 2020 07:47:23 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id F0783206D7 for ; Tue, 11 Feb 2020 07:47:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F0783206D7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0D02B6EDD4; Tue, 11 Feb 2020 07:47:13 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by gabe.freedesktop.org (Postfix) with ESMTPS id B2D426EDD3; Tue, 11 Feb 2020 07:47:10 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Feb 2020 23:47:10 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,428,1574150400"; d="scan'208";a="312993673" Received: from helsinki.fi.intel.com ([10.237.66.159]) by orsmga001.jf.intel.com with ESMTP; 10 Feb 2020 23:47:08 -0800 From: Gwan-gyeong Mun To: intel-gfx@lists.freedesktop.org Date: Tue, 11 Feb 2020 09:46:44 +0200 Message-Id: <20200211074657.231405-6-gwan-gyeong.mun@intel.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200211074657.231405-1-gwan-gyeong.mun@intel.com> References: <20200211074657.231405-1-gwan-gyeong.mun@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v7 05/18] video/hdmi: Add Unpack only function for DRM infoframe X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" It adds an unpack only function for DRM infoframe for dynamic range and mastering infoframe readout. It unpacks the information data block contained in the binary buffer into a structured frame of the HDMI Dynamic Range and Mastering (DRM) information frame. In contrast to hdmi_drm_infoframe_unpack() function, it does not verify a checksum. It can be used for unpacking a DP HDR Metadata Infoframe SDP case. DP HDR Metadata Infoframe SDP uses the same Dynamic Range and Mastering (DRM) information (CTA-861-G spec.) such as HDMI DRM infoframe. But DP SDP header and payload structure are different from HDMI DRM Infoframe. Therefore unpacking DRM infoframe for DP requires skipping of a verifying checksum. Signed-off-by: Gwan-gyeong Mun Reviewed-by: Uma Shankar --- drivers/video/hdmi.c | 58 +++++++++++++++++++++++++++++++------------- include/linux/hdmi.h | 2 ++ 2 files changed, 43 insertions(+), 17 deletions(-) diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c index 9c82e2a0a411..9818836d82b7 100644 --- a/drivers/video/hdmi.c +++ b/drivers/video/hdmi.c @@ -1775,20 +1775,18 @@ hdmi_vendor_any_infoframe_unpack(union hdmi_vendor_any_infoframe *frame, } /** - * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM infoframe + * hdmi_drm_infoframe_unpack_only() - unpack binary buffer to a HDMI DRM infoframe * @frame: HDMI DRM infoframe * @buffer: source buffer * @size: size of buffer * - * Unpacks the information contained in binary @buffer into a structured + * Unpacks the information data block contained in binary @buffer into a structured * @frame of the HDMI Dynamic Range and Mastering (DRM) information frame. - * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4 - * specification. * * Returns 0 on success or a negative error code on failure. */ -static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame, - const void *buffer, size_t size) +int hdmi_drm_infoframe_unpack_only(struct hdmi_drm_infoframe *frame, + const void *buffer, size_t size) { const u8 *ptr = buffer; const u8 *temp; @@ -1797,23 +1795,13 @@ static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame, int ret; int i; - if (size < HDMI_INFOFRAME_SIZE(DRM)) - return -EINVAL; - - if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM || - ptr[1] != 1 || - ptr[2] != HDMI_DRM_INFOFRAME_SIZE) - return -EINVAL; - - if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0) + if (size < HDMI_DRM_INFOFRAME_SIZE) return -EINVAL; ret = hdmi_drm_infoframe_init(frame); if (ret) return ret; - ptr += HDMI_INFOFRAME_HEADER_SIZE; - frame->eotf = ptr[0] & 0x7; frame->metadata_type = ptr[1] & 0x7; @@ -1837,6 +1825,42 @@ static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame, return 0; } +EXPORT_SYMBOL(hdmi_drm_infoframe_unpack_only); + +/** + * hdmi_drm_infoframe_unpack() - unpack binary buffer to a HDMI DRM infoframe + * @frame: HDMI DRM infoframe + * @buffer: source buffer + * @size: size of buffer + * + * Unpacks the information contained in binary @buffer into a structured + * @frame of the HDMI Dynamic Range and Mastering (DRM) information frame. + * Also verifies the checksum as required by section 5.3.5 of the HDMI 1.4 + * specification. + * + * Returns 0 on success or a negative error code on failure. + */ +static int hdmi_drm_infoframe_unpack(struct hdmi_drm_infoframe *frame, + const void *buffer, size_t size) +{ + const u8 *ptr = buffer; + int ret; + + if (size < HDMI_INFOFRAME_SIZE(DRM)) + return -EINVAL; + + if (ptr[0] != HDMI_INFOFRAME_TYPE_DRM || + ptr[1] != 1 || + ptr[2] != HDMI_DRM_INFOFRAME_SIZE) + return -EINVAL; + + if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(DRM)) != 0) + return -EINVAL; + + ret = hdmi_drm_infoframe_unpack_only(frame, ptr + HDMI_INFOFRAME_HEADER_SIZE, + size - HDMI_INFOFRAME_HEADER_SIZE); + return ret; +} /** * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h index 9918a6c910c5..afb43efc03e0 100644 --- a/include/linux/hdmi.h +++ b/include/linux/hdmi.h @@ -219,6 +219,8 @@ ssize_t hdmi_drm_infoframe_pack(struct hdmi_drm_infoframe *frame, void *buffer, ssize_t hdmi_drm_infoframe_pack_only(const struct hdmi_drm_infoframe *frame, void *buffer, size_t size); int hdmi_drm_infoframe_check(struct hdmi_drm_infoframe *frame); +int hdmi_drm_infoframe_unpack_only(struct hdmi_drm_infoframe *frame, + const void *buffer, size_t size); enum hdmi_spd_sdi { HDMI_SPD_SDI_UNKNOWN,