From patchwork Wed Sep 20 14:35:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 13392892 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 901E3CE79DC for ; Wed, 20 Sep 2023 14:36:14 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id DF3FD10E4D9; Wed, 20 Sep 2023 14:36:13 +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 36E2410E4D9 for ; Wed, 20 Sep 2023 14:36:06 +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 AAFB561CC6; Wed, 20 Sep 2023 14:36:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 29206C433C8; Wed, 20 Sep 2023 14:36:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1695220565; bh=lXMcFdXGAqAsjrhuAMWp5qAOuNTHDtYv9Cmznd6VTBU=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=RRSbc/RVuu/kOWipYUkfL0940suc8Ru6ctlxQdbjPSwLPw/M/2MO3eEuhl6fjOpH8 D/7OFbfeiG9vDs1xevKSFZYYy+jecTYqS1nLdUm2LkV6mqimRvBkAQ/3Th31uENvul mHPa99AtHamXnDe4KCrv93/+bM3WcUBufKnO/aQ/ivr9gDkVOCB1m6N9bjxKwCDwwW wBjlicZc6iuK39Tgr1VkDqmnM/D3hOlF1t3z4cP+87bPYhnfefrJiKP9dJYmwiYCbJ KjkwzXf57qTDib2vqirZmBtvknxedueCTnRcyihucMpYn+KrJEo4SJI9R7JY5qwcQP EiSeGY8osM4Vg== From: Maxime Ripard Date: Wed, 20 Sep 2023 16:35:23 +0200 Subject: [PATCH RFC v2 08/37] drm/connector: hdmi: Calculate TMDS character rate MIME-Version: 1.0 Message-Id: <20230920-kms-hdmi-connector-state-v2-8-17932daddd7d@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=3768; i=mripard@kernel.org; h=from:subject:message-id; bh=lXMcFdXGAqAsjrhuAMWp5qAOuNTHDtYv9Cmznd6VTBU=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDKnczJYGhSJuPMq2blfzFW55s+TuW7dDn/+t/A7VkJOc5 78+uubVUcrCIMbFICumyBIjbL4k7tSs151sfPNg5rAygQxh4OIUgIlkdzEybNVitXerN9fn7Xry NWVTYWSg6RPlZUqH0jOnzpCymhlcxfDPKOgZzwXnkxZe59KehzfOyf969/kPJZNdi/9/jnp7SSG QCQA= 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" Most HDMI drivers have some code to calculate the TMDS character rate, usually to adjust an internal clock to match what the mode requires. Since the TMDS character rates mostly depends on the resolution, whether we need to repeat pixels or not, the bpc count and the format, we can now derive it from the HDMI connector state that stores all those infos and remove the duplication from drivers. Signed-off-by: Maxime Ripard --- drivers/gpu/drm/drm_atomic.c | 1 + drivers/gpu/drm/drm_atomic_state_helper.c | 39 +++++++++++++++++++++++++++++++ include/drm/drm_connector.h | 5 ++++ 3 files changed, 45 insertions(+) diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c index a50589b88a79..4cdbd8979d8d 100644 --- a/drivers/gpu/drm/drm_atomic.c +++ b/drivers/gpu/drm/drm_atomic.c @@ -1149,6 +1149,7 @@ static void drm_atomic_connector_print_state(struct drm_printer *p, drm_printf(p, "\toutput_bpc=%u\n", state->hdmi.output_bpc); drm_printf(p, "\toutput_format=%s\n", drm_hdmi_connector_get_output_format_name(state->hdmi.output_format)); + drm_printf(p, "\ttmds_char_rate=%llu\n", state->hdmi.tmds_char_rate); } if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK) diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c index 3e0c10f2c456..0417d964a590 100644 --- a/drivers/gpu/drm/drm_atomic_state_helper.c +++ b/drivers/gpu/drm/drm_atomic_state_helper.c @@ -635,6 +635,36 @@ connector_state_get_adjusted_mode(const struct drm_connector_state *state) return &crtc_state->adjusted_mode; } +static enum drm_mode_status +hdmi_clock_valid(const struct drm_connector *connector, + const struct drm_display_mode *mode, + unsigned long long clock) +{ + const struct drm_display_info *info = &connector->display_info; + + if (info->max_tmds_clock && clock > info->max_tmds_clock * 1000) + return MODE_CLOCK_HIGH; + + return MODE_OK; +} + +static int +hdmi_compute_clock(const struct drm_connector *connector, + struct drm_connector_state *state, + const struct drm_display_mode *mode, + unsigned int bpc, enum hdmi_colorspace fmt) +{ + unsigned long long clock; + + clock = drm_connector_hdmi_compute_mode_clock(mode, bpc, fmt); + if (!hdmi_clock_valid(connector, mode, clock) != MODE_OK) + return -EINVAL; + + state->hdmi.tmds_char_rate = clock; + + return 0; +} + /** * drm_atomic_helper_connector_hdmi_check() - Helper to check HDMI connector atomic state * @connector: DRM Connector @@ -654,6 +684,15 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector, drm_atomic_get_old_connector_state(state, connector); struct drm_connector_state *new_state = drm_atomic_get_new_connector_state(state, connector); + const struct drm_display_mode *mode = + connector_state_get_adjusted_mode(new_state); + int ret; + + ret = hdmi_compute_clock(connector, new_state, mode, + new_state->hdmi.output_bpc, + new_state->hdmi.output_format); + if (!ret) + return ret; if (old_state->hdmi.broadcast_rgb != new_state->hdmi.broadcast_rgb || old_state->hdmi.output_bpc != new_state->hdmi.output_bpc || diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h index d74e9c64ee88..025380ebd128 100644 --- a/include/drm/drm_connector.h +++ b/include/drm/drm_connector.h @@ -1069,6 +1069,11 @@ struct drm_connector_state { * @output_format: Pixel format to output in. */ enum hdmi_colorspace output_format; + + /** + * @tmds_char_rate: TMDS Character Rate, in Hz. + */ + unsigned long long tmds_char_rate; } hdmi; };