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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E792AC433EF for ; Mon, 11 Oct 2021 09:46:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D205260EDF for ; Mon, 11 Oct 2021 09:46:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235588AbhJKJsg (ORCPT ); Mon, 11 Oct 2021 05:48:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35306 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235714AbhJKJse (ORCPT ); Mon, 11 Oct 2021 05:48:34 -0400 Received: from mail-wr1-x42b.google.com (mail-wr1-x42b.google.com [IPv6:2a00:1450:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 40729C061768 for ; Mon, 11 Oct 2021 02:46:34 -0700 (PDT) Received: by mail-wr1-x42b.google.com with SMTP id t2so54181015wrb.8 for ; Mon, 11 Oct 2021 02:46:34 -0700 (PDT) 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=qeDnF7/0L+8b2rsbo3X+Y/DSsOq81VJxq7sH0PX/jgg=; b=tpMOIdGryFo1QjiBcb62qTrgRhnPEdQCHHiiPzoeNs9b4KuW4Aqt4HPekNwSHQLYcf AXSmtYzqLDFUvjnktArYfNRsrz/NFDWtp01w6diZ8uNpc/v08optqgv7gw4MIK3zCLtl cvob0ZXJVhQczg/+uDjXdm4H61HrB8ideu4MjR+8Mjv3C+DEVdj7HM9+eiOa3g2tLw2Q YFaWK2hWMvvbHBpHjUfvoOUT3sBm5PFjfuk9B/JkxQkSJlyg0CIpPxZm2b4QlaZete8p g5df52gSEWy7Wz4zjekcIfFtTrXTxX9NkKX9+0qjn4RKmsFjDBOqwzv46PtN8mw6n2xy 3kQQ== 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=qeDnF7/0L+8b2rsbo3X+Y/DSsOq81VJxq7sH0PX/jgg=; b=7dN5p8w0L+1g+L6RgG+h8T2c24WWYspkXZcq7N6yn/XXmQSSLjFvRfjqxCbfAh+4hS 6p6CIEyuCy6xqXD5qgIRutezfh1/1xFZ9R6jNiCCPViLpeMfknqVVKHR7HCsIGCwmLdZ Am3W5DwUECFf+8IaZNwqSck2PRy8xWDeTLUd9h0gsGvlZrA/BjcgCnY+Ap2HPQTEG9Lv +9TALIKz6Jngi0inso/urlOSTWnPnnVVQDx0sWf+IIM+FES8aFaul7tqV93UzT5cpbnn MJfB8fapvYfjD79qj0GKbHTk8t4UmVDJF+x5b5Ne27/gZTJQDyJBH0QhOCfR1TxP3Lka kNVQ== X-Gm-Message-State: AOAM530oWwbn5xXQ503dL3VgdmSK9i7xwCv1KmqFluZCShwBPJXDU0OI Zw/Pf00Wtv7FUV9JqHSTWJbuxw== X-Google-Smtp-Source: ABdhPJwgS6TG+8TotyLRqb3ziVReox2oJ1Z5bPjobcSaB38Y1fdmvoaxDKzu2Sd/pIdIGFJLH4WQ5g== X-Received: by 2002:a1c:1b90:: with SMTP id b138mr19886387wmb.160.1633945592564; Mon, 11 Oct 2021 02:46:32 -0700 (PDT) Received: from blmsp.lan ([2a02:2454:3e6:c900::97e]) by smtp.gmail.com with ESMTPSA id o8sm21349291wme.38.2021.10.11.02.46.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Oct 2021 02:46:32 -0700 (PDT) From: Markus Schneider-Pargmann To: Chun-Kuang Hu , Philipp Zabel , Rob Herring , Vinod Koul Cc: Sam Ravnborg , dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, Markus Schneider-Pargmann Subject: [PATCH v4 3/7] drm/edid: Add cea_sad helpers for freq/length Date: Mon, 11 Oct 2021 11:46:20 +0200 Message-Id: <20211011094624.3416029-4-msp@baylibre.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211011094624.3416029-1-msp@baylibre.com> References: <20211011094624.3416029-1-msp@baylibre.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org 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 --- Notes: Changes v2 -> v3: - Add DRM_ prefix to the CEA_SAD defines. Changes v1 -> v2: - Use const struct pointers. - Add a check whether the format is actually uncompressed or not. 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 6325877c5fd6..c134803e18db 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -4666,6 +4666,80 @@ 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 deccfd39e6db..9d75df652b17 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); -- 2.33.0