From patchwork Mon Dec 27 09:33:27 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guillaume Ranquet X-Patchwork-Id: 12699636 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 95145C433F5 for ; Mon, 27 Dec 2021 09:34:01 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 41F0E10E5A6; Mon, 27 Dec 2021 09:34:00 +0000 (UTC) Received: from mail-ed1-x52e.google.com (mail-ed1-x52e.google.com [IPv6:2a00:1450:4864:20::52e]) by gabe.freedesktop.org (Postfix) with ESMTPS id 708F810E5A6 for ; Mon, 27 Dec 2021 09:33:59 +0000 (UTC) Received: by mail-ed1-x52e.google.com with SMTP id o6so59581605edc.4 for ; Mon, 27 Dec 2021 01:33:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=DPDBPrmR0Iq3ngKw0EvBqQA5UwN0K6nnYMPRbJ4cDDg=; b=gf/KumjXPSM0dv4bFPhfqhpqPjbxaDyNvzOfiu/gbp7F++KzoH4/+MMJV7B9Fn1kJ3 E3m8ZeuTmFOlI6LiGjOzv4ABqVBJZQcmHcgeIJnd45pZ/tF5MDs8LoFN0h6c69dtoByp Yu8kYKBO2uZ8cQhxgtAiDKULBExcIUp6eTNfH3hugD1d/QygQ0n14zGrsg5+enMgVjll 2GxS/7Qy1/qkxog3f9KRCgmC49oNPYb8hrWtM6DvsT+1JVOPDNPQaOTLBi7AH2V612/p ZelIGyzu6UQgBNhBSlptWS+86tWaWCSPUiVmtRwYk39f9yC5jmBctjLNdbdR9VqWr1hm Vcfw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=DPDBPrmR0Iq3ngKw0EvBqQA5UwN0K6nnYMPRbJ4cDDg=; b=D2VftBh82qu+9y27+99iK89B8tDSoUeeMf59tXa7xioet1XV/9Y489Aq+h7DJ7/xc7 kYCMh389eKCjGkz+/0wnn/ASi/wBgzBSDqBgZYgN4skVBrAO0XhtsykrVgGjXkV7GPON N2FFWGD8VjpzNURlybx0n64bvQIX5cpbEmNrob8h6UuUW+rqZtxvWR0QU7Lg8tQySXxs UsreLNI3hhVgDCLvlr7i+1zzz5p5TtPD3QVexiSI+OtRFyHG99j0IX54UW7MSYRoMM1r 5X5IA0DOm9SP3dF3XBu319b3bvs6XOeUTuhFH7HfPehpAR1SFHmbm+kOTWh1V3vLZ/IX G/kA== X-Gm-Message-State: AOAM530fifJqty5SXpiqp1wOdyBG+xWmdEX+3tHjQZ7Y31wJjmUIXFqp BmmtuSgDiWFWVlX8IcwGV3OzpA== X-Google-Smtp-Source: ABdhPJyzG3F596+LDFlD5eCYFkrk+Tg/ro+9uoAis4ZQJVCmYhq1uG3Jp2KSwG1AQVNOg1wpzvd46g== X-Received: by 2002:a05:6402:12ce:: with SMTP id k14mr15888321edx.314.1640597637915; Mon, 27 Dec 2021 01:33:57 -0800 (PST) Received: from localhost.localdomain (2a02-8440-6140-7e07-3074-96af-9642-0003.rev.sfr.net. [2a02:8440:6140:7e07:3074:96af:9642:3]) by smtp.gmail.com with ESMTPSA id qf14sm4287568ejc.18.2021.12.27.01.33.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Dec 2021 01:33:57 -0800 (PST) From: Guillaume Ranquet To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter Subject: [PATCH v7 3/8] drm/edid: Add cea_sad helpers for freq/length Date: Mon, 27 Dec 2021 10:33:27 +0100 Message-Id: <20211227093329.5589-1-granquet@baylibre.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211217150854.2081-1-granquet@baylibre.com> References: <20211217150854.2081-1-granquet@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: , Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Markus Schneider-Pargmann Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Markus Schneider-Pargmann 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 Signed-off-by: Guillaume Ranquet --- drivers/gpu/drm/drm_edid.c | 74 ++++++++++++++++++++++++++++++++++++++ include/drm/drm_edid.h | 18 ++++++++-- 2 files changed, 90 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index 12893e7be89bb..500279a82167a 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -4747,6 +4747,80 @@ 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(const struct cea_sad *sad) +{ + switch (sad->freq) { + case DRM_CEA_SAD_FREQ_32KHZ: + return 32000; + case DRM_CEA_SAD_FREQ_44KHZ: + return 44100; + case DRM_CEA_SAD_FREQ_48KHZ: + return 48000; + case DRM_CEA_SAD_FREQ_88KHZ: + return 88200; + case DRM_CEA_SAD_FREQ_96KHZ: + return 96000; + case DRM_CEA_SAD_FREQ_176KHZ: + return 176400; + case DRM_CEA_SAD_FREQ_192KHZ: + return 192000; + default: + return -EINVAL; + } +} +EXPORT_SYMBOL(drm_cea_sad_get_sample_rate); + +static bool drm_cea_sad_is_uncompressed(const struct cea_sad *sad) +{ + switch (sad->format) { + case HDMI_AUDIO_CODING_TYPE_STREAM: + case HDMI_AUDIO_CODING_TYPE_PCM: + return true; + default: + return false; + } +} + +/** + * 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(const struct cea_sad *sad) +{ + if (!drm_cea_sad_is_uncompressed(sad)) { + DRM_WARN("Unable to get the uncompressed word length for a compressed format: %u\n", + sad->format); + return -EINVAL; + } + + switch (sad->byte2) { + case DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT: + return 16; + case DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT: + return 20; + case DRM_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 18f6c700f6d02..a30452b313979 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 DRM_CEA_SAD_FREQ_32KHZ BIT(0) +#define DRM_CEA_SAD_FREQ_44KHZ BIT(1) +#define DRM_CEA_SAD_FREQ_48KHZ BIT(2) +#define DRM_CEA_SAD_FREQ_88KHZ BIT(3) +#define DRM_CEA_SAD_FREQ_96KHZ BIT(4) +#define DRM_CEA_SAD_FREQ_176KHZ BIT(5) +#define DRM_CEA_SAD_FREQ_192KHZ BIT(6) + +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_16BIT BIT(0) +#define DRM_CEA_SAD_UNCOMPRESSED_WORD_20BIT BIT(1) +#define DRM_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(const struct cea_sad *sad); +int drm_cea_sad_get_uncompressed_word_length(const struct cea_sad *sad); int drm_av_sync_delay(struct drm_connector *connector, const struct drm_display_mode *mode);