From patchwork Mon Aug 16 19:25:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Markus Schneider-Pargmann X-Patchwork-Id: 12439123 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39FF5C4338F for ; Mon, 16 Aug 2021 19:25:59 +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 AB83460EAF for ; Mon, 16 Aug 2021 19:25:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org AB83460EAF Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 751AF6E045; Mon, 16 Aug 2021 19:25:52 +0000 (UTC) Received: from mail-wr1-x429.google.com (mail-wr1-x429.google.com [IPv6:2a00:1450:4864:20::429]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1C2BC89819 for ; Mon, 16 Aug 2021 19:25:50 +0000 (UTC) Received: by mail-wr1-x429.google.com with SMTP id k8so6148554wrn.3 for ; Mon, 16 Aug 2021 12:25:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=5GQZcK6R0BkYHGP9eubs/dRk+ABz3Z6fvnc3XZsSEy8=; b=qswMkmAu9bvSVVAU5bWeCnVdJT1Xtnk8Vj9Ey3kptbC3XhmPW77Dfm1zVC9qm7vHsb cFWqnPtkV3X9dss5MkTxth9Jnb/vLDe3gFa0vGkJV3EkXh4JcTzyvD7Qv8J1nnWU0lcL julwMf+kHajNnxxAXdqK3J3dilfUlCqiJk9aOjOOlF9Pc4N6NwTNhsPBjeEJjK7pHniJ QLWRQMSWHGMKRLRs7M+ObckE0hKA7BVvdLeHiR/tf/D9BRdMYHD9qSTg0ZUwxzNe5PPd cBPPx1BwQ3rSLM6Rcka0MVtjYjKFgN2DLq0zaykYxaAvCYGtClsXkrwQdjOZ7wZd0av/ uDPQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=5GQZcK6R0BkYHGP9eubs/dRk+ABz3Z6fvnc3XZsSEy8=; b=rncUcl9HlkRzHvkeSQ0I0MEE7edyLnwQZf3C454IFRS+wU6VF/BmFmsXTfIPD62qEh fookpad7CVNAVxA2LosQYkvfmj4NVktoh++0b+Dkg1aG73bO/+aEaCqJveMTiW7J0sQQ Md6GvOB/KRuXV4jeyrgi1KkbGwKrsXXrevHADRTjgZ//LYP75AbQDsHr6qQhqGrKw6r8 ETWs4Or8Tr0XFY5a5CD9lVkRLpdcIp8Gk8KwidlSsem6c6aDARPCq2rX0SUMirLW9sgv nsEYXQWvgt729WrUblILBAdKeSZqxSzyzL1UHXNE7D02QUmfUsnF6Zps2rtmz5kKrPp4 Nizg== X-Gm-Message-State: AOAM533ga8b/a7e+MCJHuzlrce/+BTkOUPiQKRIk4V73Wf3t8xQoY0ql wsDHF6+prueAX0PkosXnZ8JgAQ== X-Google-Smtp-Source: ABdhPJwITFVfElVNGgxJw2RutXnkGSR5NyNK8EdadYD0hJjotYhAoS2uhBbK/P2u4IKKms4iL/Ne9w== X-Received: by 2002:a5d:49c5:: with SMTP id t5mr45265wrs.161.1629141948597; Mon, 16 Aug 2021 12:25:48 -0700 (PDT) Received: from blmsp.lan ([2a02:2454:3e6:c900::97e]) by smtp.gmail.com with ESMTPSA id k17sm333954wmj.0.2021.08.16.12.25.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Aug 2021 12:25:48 -0700 (PDT) From: Markus Schneider-Pargmann To: Chun-Kuang Hu , Philipp Zabel Cc: dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Markus Schneider-Pargmann Subject: [RFC PATCH 3/5] drm/edid: Add cea_sad helpers for freq/length Date: Mon, 16 Aug 2021 21:25:21 +0200 Message-Id: <20210816192523.1739365-4-msp@baylibre.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210816192523.1739365-1-msp@baylibre.com> References: <20210816192523.1739365-1-msp@baylibre.com> MIME-Version: 1.0 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This patch adds two helper functions that extract the frequency and word length from a struct cea_sad. For these helper functions new defines are added that help translate the 'freq' and 'byte2' fields into real numbers. Signed-off-by: Markus Schneider-Pargmann --- drivers/gpu/drm/drm_edid.c | 57 ++++++++++++++++++++++++++++++++++++++ include/drm/drm_edid.h | 18 ++++++++++-- 2 files changed, 73 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 81d5f2524246..2389d34ce10e 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -4666,6 +4666,63 @@ int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb) } EXPORT_SYMBOL(drm_edid_to_speaker_allocation); +/** + * drm_cea_sad_get_sample_rate - Extract the sample rate from cea_sad + * @sad: Pointer to the cea_sad struct + * + * Extracts the cea_sad frequency field and returns the sample rate in Hz. + * + * Return: Sample rate in Hz or a negative errno if parsing failed. + */ +int drm_cea_sad_get_sample_rate(struct cea_sad *sad) +{ + switch (sad->freq) { + case CEA_SAD_FREQ_32KHZ: + return 32000; + case CEA_SAD_FREQ_44KHZ: + return 44100; + case CEA_SAD_FREQ_48KHZ: + return 48000; + case CEA_SAD_FREQ_88KHZ: + return 88200; + case CEA_SAD_FREQ_96KHZ: + return 96000; + case CEA_SAD_FREQ_176KHZ: + return 176400; + case CEA_SAD_FREQ_192KHZ: + return 192000; + default: + return -EINVAL; + } +} +EXPORT_SYMBOL(drm_cea_sad_get_sample_rate); + +/** + * drm_cea_sad_get_uncompressed_word_length - Extract word length + * @sad: Pointer to the cea_sad struct + * + * Extracts the cea_sad byte2 field and returns the word length for an + * uncompressed stream. + * + * Note: This function may only be called for uncompressed audio. + * + * Return: Word length in bits or a negative errno if parsing failed. + */ +int drm_cea_sad_get_uncompressed_word_length(struct cea_sad *sad) +{ + switch (sad->byte2) { + case CEA_SAD_UNCOMPRESSED_WORD_16BIT: + return 16; + case CEA_SAD_UNCOMPRESSED_WORD_20BIT: + return 20; + case CEA_SAD_UNCOMPRESSED_WORD_24BIT: + return 24; + default: + return -EINVAL; + } +} +EXPORT_SYMBOL(drm_cea_sad_get_uncompressed_word_length); + /** * drm_av_sync_delay - compute the HDMI/DP sink audio-video sync delay * @connector: connector associated with the HDMI/DP sink diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index 759328a5eeb2..bed091a749ef 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -361,12 +361,24 @@ struct edid { /* Short Audio Descriptor */ struct cea_sad { - u8 format; + u8 format; /* See HDMI_AUDIO_CODING_TYPE_* */ u8 channels; /* max number of channels - 1 */ - u8 freq; + u8 freq; /* See CEA_SAD_FREQ_* */ u8 byte2; /* meaning depends on format */ }; +#define CEA_SAD_FREQ_32KHZ BIT(0) +#define CEA_SAD_FREQ_44KHZ BIT(1) +#define CEA_SAD_FREQ_48KHZ BIT(2) +#define CEA_SAD_FREQ_88KHZ BIT(3) +#define CEA_SAD_FREQ_96KHZ BIT(4) +#define CEA_SAD_FREQ_176KHZ BIT(5) +#define CEA_SAD_FREQ_192KHZ BIT(6) + +#define CEA_SAD_UNCOMPRESSED_WORD_16BIT BIT(0) +#define CEA_SAD_UNCOMPRESSED_WORD_20BIT BIT(1) +#define CEA_SAD_UNCOMPRESSED_WORD_24BIT BIT(2) + struct drm_encoder; struct drm_connector; struct drm_connector_state; @@ -374,6 +386,8 @@ struct drm_display_mode; int drm_edid_to_sad(struct edid *edid, struct cea_sad **sads); int drm_edid_to_speaker_allocation(struct edid *edid, u8 **sadb); +int drm_cea_sad_get_sample_rate(struct cea_sad *sad); +int drm_cea_sad_get_uncompressed_word_length(struct cea_sad *sad); int drm_av_sync_delay(struct drm_connector *connector, const struct drm_display_mode *mode);