From patchwork Tue Oct 31 16:48:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 13442043 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 6ED03C4167D for ; Tue, 31 Oct 2023 16:49:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346595AbjJaQtN (ORCPT ); Tue, 31 Oct 2023 12:49:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346670AbjJaQs5 (ORCPT ); Tue, 31 Oct 2023 12:48:57 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 663F5E6; Tue, 31 Oct 2023 09:48:55 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AD124C433C8; Tue, 31 Oct 2023 16:48:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1698770935; bh=QJmVeePAcx7pV7co2N1PaJoFmnt45FQ/oBA2SPqfG3E=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=TTnDbqzhaIZg6xykK+YYO26NzZCUZMkdG8Br5D4Lk8NxtADtnJ9Uowhm3PfXBkU4C gbujt0UanSQidnvTFs24pqjQeBdELmyKqURFDxpgxOanSkXLr718VZ4+lM4z2xOMgy hVEz5fLz+x0UXuz7Ps4NJft92xCXXySTm/6F/mLkf5+AKy3TWvdOTySraxI2TAgvxp gS6RxGBC/nS07mop/Vq4Gj5lJldO4V0JdqL0fR3p0F1CMZ1NCfrj0y7WNj3lkquY2S ZsjIadQaCvXu5eZvgN5jX8AS2qde8oGY7fZFFD4pSoFIOm8Yun52QuDN1YumZAZU6Y ROcC4tn5XgRzw== From: Maxime Ripard Date: Tue, 31 Oct 2023 17:48:20 +0100 Subject: [PATCH RFC v3 07/37] drm/connector: hdmi: Add HDMI compute clock helper MIME-Version: 1.0 Message-Id: <20231031-kms-hdmi-connector-state-v3-7-328b0fae43a7@kernel.org> References: <20231031-kms-hdmi-connector-state-v3-0-328b0fae43a7@kernel.org> In-Reply-To: <20231031-kms-hdmi-connector-state-v3-0-328b0fae43a7@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 Cc: Hans Verkuil , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-sunxi@lists.linux.dev, Maxime Ripard X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2823; i=mripard@kernel.org; h=from:subject:message-id; bh=QJmVeePAcx7pV7co2N1PaJoFmnt45FQ/oBA2SPqfG3E=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDKmO+vcq10fZy/qFds8/VsejM0/550uf07ZtzVzNh9pui Z4sDnvRUcrCIMbFICumyBIjbL4k7tSs151sfPNg5rAygQxh4OIUgImUazIy/N5akXL99KLSiWw3 zwowKq6+9b/6i4igwd1FgRdyDY7k5TP800zRq7p5/dS7rXXHd345tm76HctLIjxTtDTYp5/5smS 1ByMA X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org 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 | 34 ++++++++++++++++++++++++++++++++++ include/drm/drm_connector.h | 5 +++++ 2 files changed, 39 insertions(+) diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c index 9037e1b1b383..a96c9b54c554 100644 --- a/drivers/gpu/drm/drm_connector.c +++ b/drivers/gpu/drm/drm_connector.c @@ -2955,6 +2955,40 @@ 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 (fmt == HDMI_COLORSPACE_YUV420) + clock = clock / 2; + + 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 32f0b3b7383e..781a5726a26a 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; @@ -2118,6 +2119,10 @@ 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