From patchwork Sun Mar 27 22:39:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guillaume Ranquet X-Patchwork-Id: 12792943 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E47C6C4167D for ; Sun, 27 Mar 2022 22:41:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236999AbiC0Wmv (ORCPT ); Sun, 27 Mar 2022 18:42:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45436 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237001AbiC0Wmr (ORCPT ); Sun, 27 Mar 2022 18:42:47 -0400 Received: from mail-wr1-x42e.google.com (mail-wr1-x42e.google.com [IPv6:2a00:1450:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6B10A32EE2 for ; Sun, 27 Mar 2022 15:41:07 -0700 (PDT) Received: by mail-wr1-x42e.google.com with SMTP id b19so17868423wrh.11 for ; Sun, 27 Mar 2022 15:41:07 -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=FFfw8+AcCO+oGSsE3C0mLYlgKyVPXn65QX6gJCkZYQ8=; b=PtCrAZqRN/HnmjJXDVwdcrFJ09HL3kht6yfTyoxnzNMjZQpba9EJRCFkFBuQ0na9il 0AqPgXohm4+Yzcfg7GXzOd8EJiS2oq6Ig2G4UAbcnTZdxHHVrm/jD1K2ru9K3Uy6T8Rm mrLa0VB1LLDeiRDpAULWfxSEPbFvHERKjcVUm/mXGTyFOufpo/UdrGL1K6zUBc6DkcjN 0IQ3DxKSTimhZEoDS2N4PLCnhaplQVWY4dkT3xxpwK2WU0dgonXi261cZBrPrfPmfuWg NGZO4bwiUNdsGmxL1vH/cTsH67jElytW5Qro3oWtF5mb0W1ape333kLElvu8jSdqF6Jv MG9Q== 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=FFfw8+AcCO+oGSsE3C0mLYlgKyVPXn65QX6gJCkZYQ8=; b=rf2Ju/8fDU3fnfZUdtfcJMJL4/zh8qFoONUfebjZeUETlZsnOq+03enytujf0It5Gg Vist7mKTIP2s80JqkWxsH/prY+83qv1Nm0hizV3Gqe3PfRbd0FE1hBfN7JPwHiop1Ii4 L+JiAjR+jJ0Ll7Tg5lmOWvAKjhQjlvgjRRKzFhOK6mfgnMhFI5l4VNfxABhgUGtW+AtX Aw8A/bBqLyQ4WbJo61hKilxQB2ncBONOMTkbWjmAOupnTATN8GD1kX0yplO39po406sC 0+l0REozC4QMdOy7pV9KzUf64hJYD5QJTvztYLJJpJBnvA6u3whtkx+Tln02/0fyBUG7 binQ== X-Gm-Message-State: AOAM532R3O5dMpCAqsO73shhxSnAuR0AtlM0fSYaEiGaKQ4KGB+naZrW wzegN1U3weEj2Dgfb2vlrQgkbg== X-Google-Smtp-Source: ABdhPJz6lVJWhj+/V8WiEX6cNk9H8uTXpPe8YFLNErcslI7n6gUFl/aIC510T7p6adIYgaXEn/pjQw== X-Received: by 2002:a5d:4101:0:b0:205:86cb:dd1b with SMTP id l1-20020a5d4101000000b0020586cbdd1bmr19210023wrp.480.1648420865910; Sun, 27 Mar 2022 15:41:05 -0700 (PDT) Received: from localhost.localdomain (2a02-8440-6341-357e-3074-96af-9642-0002.rev.sfr.net. [2a02:8440:6341:357e:3074:96af:9642:2]) by smtp.gmail.com with ESMTPSA id v5-20020adfe4c5000000b001edc1e5053esm10400867wrm.82.2022.03.27.15.41.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Mar 2022 15:41:05 -0700 (PDT) From: Guillaume Ranquet To: airlied@linux.ie, angelogioacchino.delregno@collabora.com, chunfeng.yun@mediatek.com, chunkuang.hu@kernel.org, ck.hu@mediatek.com, daniel@ffwll.ch, deller@gmx.de, jitao.shi@mediatek.com, kishon@ti.com, krzk+dt@kernel.org, maarten.lankhorst@linux.intel.com, matthias.bgg@gmail.com, mripard@kernel.org, p.zabel@pengutronix.de, robh+dt@kernel.org, tzimmermann@suse.de, vkoul@kernel.org Cc: devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-phy@lists.infradead.org, markyacoub@google.com, Markus Schneider-Pargmann Subject: [PATCH v9 05/22] drm/edid: Add cea_sad helpers for freq/length Date: Mon, 28 Mar 2022 00:39:10 +0200 Message-Id: <20220327223927.20848-6-granquet@baylibre.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220327223927.20848-1-granquet@baylibre.com> References: <20220327223927.20848-1-granquet@baylibre.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@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 Signed-off-by: Guillaume Ranquet --- drivers/gpu/drm/drm_edid.c | 74 ++++++++++++++++++++++++++++++++++++++ include/drm/drm_edid.h | 14 ++++++++ 2 files changed, 88 insertions(+) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index cc7bd58369df..eeceae4411ba 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -4758,6 +4758,80 @@ 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 5d4d840b9904..ebd00ecae205 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -372,6 +372,18 @@ struct cea_sad { u8 byte2; }; +#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; @@ -379,6 +391,8 @@ 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);