From patchwork Wed May 8 18:38:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Shankar, Uma" X-Patchwork-Id: 10936381 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 568DF112C for ; Wed, 8 May 2019 18:12:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4C694289BC for ; Wed, 8 May 2019 18:12:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 40A02289D4; Wed, 8 May 2019 18:12:54 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id EF563289BC for ; Wed, 8 May 2019 18:12:53 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5867789938; Wed, 8 May 2019 18:12:52 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 012FA89951; Wed, 8 May 2019 18:12:50 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 May 2019 11:12:50 -0700 X-ExtLoop1: 1 Received: from linuxpresi1-desktop.iind.intel.com ([10.223.74.121]) by orsmga006.jf.intel.com with ESMTP; 08 May 2019 11:12:45 -0700 From: Uma Shankar To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Date: Thu, 9 May 2019 00:08:52 +0530 Message-Id: <1557340733-9629-13-git-send-email-uma.shankar@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1557340733-9629-1-git-send-email-uma.shankar@intel.com> References: <1557340733-9629-1-git-send-email-uma.shankar@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [v9 12/13] video/hdmi: Add Unpack function for DRM infoframe X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dcastagna@chromium.org, jonas@kwiboo.se, seanpaul@chromium.org, ville.syrjala@intel.com, maarten.lankhorst@intel.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP Added unpack function for DRM infoframe for dynamic range and mastering infoframe readout. Suggested-by: Ville Syrjälä Signed-off-by: Uma Shankar --- drivers/video/hdmi.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/hdmi.h | 1 + 2 files changed, 55 insertions(+) diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c index 717ed7fb..110d405 100644 --- a/drivers/video/hdmi.c +++ b/drivers/video/hdmi.c @@ -1801,6 +1801,57 @@ static int hdmi_audio_infoframe_unpack(struct hdmi_audio_infoframe *frame, } /** + * 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_init(frame); + if (ret) + return ret; + + frame->length = ptr[2]; + ptr += HDMI_INFOFRAME_HEADER_SIZE; + + frame->eotf = ptr[0] & 0x7; + frame->metadata_type = ptr[1] & 0x7; + + memcpy(&frame->display_primaries, &ptr[2], 12); + memcpy(&frame->white_point, &ptr[14], 4); + + frame->max_display_mastering_luminance = (ptr[19] << 8) | ptr[18]; + frame->min_display_mastering_luminance = (ptr[21] << 8) | ptr[20]; + frame->max_cll = (ptr[23] << 8) | ptr[22]; + frame->max_fall = (ptr[25] << 8) | ptr[24]; + + return 0; +} + +/** * hdmi_infoframe_unpack() - unpack binary buffer to a HDMI infoframe * @frame: HDMI infoframe * @buffer: source buffer @@ -1826,6 +1877,9 @@ int hdmi_infoframe_unpack(union hdmi_infoframe *frame, case HDMI_INFOFRAME_TYPE_AVI: ret = hdmi_avi_infoframe_unpack(&frame->avi, buffer, size); break; + case HDMI_INFOFRAME_TYPE_DRM: + ret = hdmi_drm_infoframe_unpack(&frame->drm, buffer, size); + break; case HDMI_INFOFRAME_TYPE_SPD: ret = hdmi_spd_infoframe_unpack(&frame->spd, buffer, size); break; diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h index 3d7f10f..ee55ba5 100644 --- a/include/linux/hdmi.h +++ b/include/linux/hdmi.h @@ -56,6 +56,7 @@ enum hdmi_infoframe_type { #define HDMI_AVI_INFOFRAME_SIZE 13 #define HDMI_SPD_INFOFRAME_SIZE 25 #define HDMI_AUDIO_INFOFRAME_SIZE 10 +#define HDMI_DRM_INFOFRAME_SIZE 26 #define HDMI_INFOFRAME_SIZE(type) \ (HDMI_INFOFRAME_HEADER_SIZE + HDMI_ ## type ## _INFOFRAME_SIZE)