From patchwork Fri Mar 25 17:14:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guillaume Ranquet X-Patchwork-Id: 12791773 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 675F9C433FE for ; Fri, 25 Mar 2022 17:17:00 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4214710E72B; Fri, 25 Mar 2022 17:16:58 +0000 (UTC) Received: from mail-wm1-x32a.google.com (mail-wm1-x32a.google.com [IPv6:2a00:1450:4864:20::32a]) by gabe.freedesktop.org (Postfix) with ESMTPS id 1303010E583 for ; Fri, 25 Mar 2022 17:16:55 +0000 (UTC) Received: by mail-wm1-x32a.google.com with SMTP id p184-20020a1c29c1000000b0037f76d8b484so4780050wmp.5 for ; Fri, 25 Mar 2022 10:16:54 -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=bYxsps88w8XOTS4NTOr0eUjfIjqeWe2ct6Gz/AMg8SQ=; b=3QeDLL+kno2ASafNq1yAb+eY4UN1c6ynD3eQFooOufQwRPGl+4wMEaT1N5cCrY99Si VNLFY0Y4we3NdSHkYcoBhNLSatiuy3H1J6+K4H7kV2i6VXlK+v6UlgAC8se+jjwoqjhX mTW/CF6a0rKfHBItcMn8Ar9gBmCKsHWpdqXWF2kUrpr6qCLPj5ssBHCupdrOLoJlLXK2 IdW2FqJnPqf8Wtlswtx2B/Ec4RsCJZKUr2Y5tKvf+xYGsnzYz3Wfgl3WpLExdToNMG0D J/ni6ftntvbnq0QHLkXZE0xTJQoTJKifEvEOIVtULBJPX8kk/ujsIBCkEmzaexC2xD69 ja5Q== 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=bYxsps88w8XOTS4NTOr0eUjfIjqeWe2ct6Gz/AMg8SQ=; b=lRtHawJwTe0bHIs5qiRqw8JFooJO7B7E3obJKCGYxWVRa4ebgO2X0d/EfD9tbdfYQd Yd0gDLvqLp0NSfOK4nVBlcxE5cqNVfrHbz1g0RosykGdPjStSpd0Omfzv1xJsHydzyF9 2dmj1f4zROVV47gAsKQ3fz2zy4whZgktE25xaSP8qtRs80bbOW8yaxauM+VA+0fh4J/k wPt3atKwe5GVgypNInBfizknD3a3L2ldmS2kLGMqWmIGQ9qeMPXrOCn6l9PEJ/ZnwVq2 Av1B881p5+C0Jo1xsMg2/jE4No3yqCgkcM3rMKqzMyExG9xDbTZLE6VbXStH6LvvTVYZ HQtA== X-Gm-Message-State: AOAM532HQafSGysTitKvG8LC0iQO2fQ3aCq61WEA5flPhx7jdwY6B6D6 9p8zNdnbBIh12puvODGtperzhg== X-Google-Smtp-Source: ABdhPJydSZEDR1RKQvP5hXg5nNvDMg1nkizYbpag71bPLKRQ0E5MKTsq4pT9e5lWJ5szAy/SJlYt9g== X-Received: by 2002:a05:600c:3b1e:b0:38c:da9f:9309 with SMTP id m30-20020a05600c3b1e00b0038cda9f9309mr7349169wms.9.1648228613538; Fri, 25 Mar 2022 10:16:53 -0700 (PDT) Received: from localhost.localdomain (2a02-8440-6240-cc41-3074-96af-9642-0003.rev.sfr.net. [2a02:8440:6240:cc41:3074:96af:9642:3]) by smtp.gmail.com with ESMTPSA id p16-20020a5d6390000000b00203ffebddf3sm7547464wru.99.2022.03.25.10.16.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Mar 2022 10:16:53 -0700 (PDT) From: Guillaume Ranquet To: chunkuang.hu@kernel.org, p.zabel@pengutronix.de, airlied@linux.ie, daniel@ffwll.ch, robh+dt@kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, matthias.bgg@gmail.com, chunfeng.yun@mediatek.com, kishon@ti.com, vkoul@kernel.org, deller@gmx.de, ck.hu@mediatek.com, jitao.shi@mediatek.com, angelogioacchino.delregno@collabora.com Subject: [PATCH 05/22] drm/edid: Add cea_sad helpers for freq/length Date: Fri, 25 Mar 2022 18:14:54 +0100 Message-Id: <20220325171511.23493-6-granquet@baylibre.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220325171511.23493-1-granquet@baylibre.com> References: <20220325171511.23493-1-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: devicetree@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Markus Schneider-Pargmann , linux-mediatek@lists.infradead.org, linux-phy@lists.infradead.org, linux-arm-kernel@lists.infradead.org, markyacoub@google.com 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 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 3b7041fc9cdf..2e98c993aaca 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);