From patchwork Wed Sep 20 14:35:22 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 13392893 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 C097ECE79DE for ; Wed, 20 Sep 2023 14:36:15 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0587C10E4DA; Wed, 20 Sep 2023 14:36:14 +0000 (UTC) Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id 80DB510E4D9 for ; Wed, 20 Sep 2023 14:36:03 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E9D1D61C11; Wed, 20 Sep 2023 14:36:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 66F26C433CA; Wed, 20 Sep 2023 14:36:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1695220562; bh=tej7oxXiGOxfY+RRvbr0V4uhNUnROLTZ07t4MCINrwA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=VggndRPlrBH2w0BpDJ7wvbTchGjAyQwZZF4r1Bt98L7hWraSNn2nPGUtThiLehUnD 2KWLp6vZkyL4TMp3jlNKJzI57JozHi0xO22DEv4QP/mGbok7OqgVXQixzLX1dhu8R4 QoCc8sSFHt7I8Mc9iOSLi4y501L1NSe3zd5fJourCGoFdSs/+g/7dYb+avC7LZhf8A Lq5KcGXDNUOazhqE7TGpELHa5iZWWLRhowLanC68A99QTHdL0KOi2G6hyNy92abMv4 qRtOoaqHLlAl8ugZooXr3pFQhGLQpprG6y7cphYjBUvKrCfGhupOzQoeBTkjIv3Kcp +qPn4ROTBtaHg== From: Maxime Ripard Date: Wed, 20 Sep 2023 16:35:22 +0200 Subject: [PATCH RFC v2 07/37] drm/connector: hdmi: Add HDMI compute clock helper MIME-Version: 1.0 Message-Id: <20230920-kms-hdmi-connector-state-v2-7-17932daddd7d@kernel.org> References: <20230920-kms-hdmi-connector-state-v2-0-17932daddd7d@kernel.org> In-Reply-To: <20230920-kms-hdmi-connector-state-v2-0-17932daddd7d@kernel.org> To: Maarten Lankhorst , Thomas Zimmermann , David Airlie , Daniel Vetter , Emma Anholt , Jonathan Corbet , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2756; i=mripard@kernel.org; h=from:subject:message-id; bh=tej7oxXiGOxfY+RRvbr0V4uhNUnROLTZ07t4MCINrwA=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDKnczJaunDaLrbifFRdO+9RofpujcVvR13LvyroPbxTii 0yPpV/uKGVhEONikBVTZIkRNl8Sd2rW6042vnkwc1iZQIYwcHEKwETsNRh+MaeKrw3nefVf8YDQ 7XePEq+tfnXfRso9urKqvq7W+EpILMP/2tqEq0fm+Cns3uh6v3hG3Itv5XYHjiuY+0wuyDMq0jv OAQA= X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D 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-doc@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Hans Verkuil , linux-rockchip@lists.infradead.org, Maxime Ripard , linux-sunxi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" A lot of HDMI drivers have some variation of the formula to calculate the TMDS character rate from a mode, but few of them actually take all parameters into account. Let's create a helper to provide that rate taking all parameters into account. Signed-off-by: Maxime Ripard --- drivers/gpu/drm/drm_connector.c | 31 +++++++++++++++++++++++++++++++ include/drm/drm_connector.h | 5 +++++ 2 files changed, 36 insertions(+) diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index b01cb4783ea6..4c1af97971bb 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -2944,6 +2944,37 @@ void drm_connector_update_privacy_screen(const struct drm_connector_state *conne } EXPORT_SYMBOL(drm_connector_update_privacy_screen); +/** + * drm_connector_hdmi_compute_mode_clock() - Computes the TMDS Character Rate + * @mode: Display mode to compute the clock for + * @bpc: Bits per character + * @fmt: Output Pixel Format used + * + * Returns the TMDS Character Rate for a given mode, bpc count and output format. + * + * RETURNS: + * The TMDS Character Rate, in Hertz + */ +unsigned long long +drm_connector_hdmi_compute_mode_clock(const struct drm_display_mode *mode, + unsigned int bpc, + enum hdmi_colorspace fmt) +{ + unsigned long long clock = mode->clock * 1000ULL; + + if (mode->flags & DRM_MODE_FLAG_DBLCLK) + clock = clock * 2; + + if (fmt == HDMI_COLORSPACE_YUV422) + bpc = 8; + + clock = clock * bpc; + do_div(clock, 8); + + return clock; +} +EXPORT_SYMBOL(drm_connector_hdmi_compute_mode_clock); + int drm_connector_set_obj_prop(struct drm_mode_object *obj, struct drm_property *property, uint64_t value) diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index a66cb4e35d7b..d74e9c64ee88 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -38,6 +38,7 @@ struct drm_connector_helper_funcs; struct drm_modeset_acquire_ctx; struct drm_device; struct drm_crtc; +struct drm_display_mode; struct drm_encoder; struct drm_panel; struct drm_property; @@ -2115,6 +2116,10 @@ void drm_connector_attach_privacy_screen_properties(struct drm_connector *conn); void drm_connector_attach_privacy_screen_provider( struct drm_connector *connector, struct drm_privacy_screen *priv); void drm_connector_update_privacy_screen(const struct drm_connector_state *connector_state); +unsigned long long +drm_connector_hdmi_compute_mode_clock(const struct drm_display_mode *mode, + unsigned int bpc, + enum hdmi_colorspace fmt); /** * struct drm_tile_group - Tile group metadata