From patchwork Tue Oct 31 16:48:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 13442008 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 38993C4167B for ; Tue, 31 Oct 2023 16:49:20 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 51A4F10E57D; Tue, 31 Oct 2023 16:49:16 +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 86BF910E579 for ; Tue, 31 Oct 2023 16:49:04 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id EC6DA60FA7; Tue, 31 Oct 2023 16:49:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4A8A1C433C8; Tue, 31 Oct 2023 16:49:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1698770943; bh=rHYthuEAKWMT+SwH14h9aTghHT2m9GRJ6TpS16pFlgM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=l9kWcqgu2ESQH2UcOr/q4TmJBMMye1TAarzPie8qKUb+sLZSG7coj4b+Y2fwm76Ku kqbsl3orAPX3OkuhxLxLvugf9jKYMFExmeitMxvIum8XdWaXOwJPojP8/ZG2AUKkSl odNaY6nbxX156ekN7kTvms9ManjBCQ8BbyYw9CXQc8IgoWyvMRRhw3Db4lyyQsXZ2V 8WltxCE/iblv2RLo1Yu4YFj81DOlZDw5AkjE2ROuSlnTyzvOPDJ562DUEjc+idZZli 8qJzH4p8mDlWdB2ksRPy96esxq0sLhzoc5VZhOOX0M7fLq2zJc6UNBJKv2XoAcyGAa qxPJG52Jb2EzA== From: Maxime Ripard Date: Tue, 31 Oct 2023 17:48:23 +0100 Subject: [PATCH RFC v3 10/37] drm/connector: hdmi: Compute bpc and format automatically MIME-Version: 1.0 Message-Id: <20231031-kms-hdmi-connector-state-v3-10-328b0fae43a7@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 X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=6972; i=mripard@kernel.org; h=from:subject:message-id; bh=rHYthuEAKWMT+SwH14h9aTghHT2m9GRJ6TpS16pFlgM=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDKmO+ve0v3yNbDNumTlJear6scSqH/Hs8XJeK56WOPB29 Wx6u5G3o5SFQYyLQVZMkSVG2HxJ3KlZrzvZ+ObBzGFlAhnCwMUpABPhbGL4779xe/Z7H816rZ07 rxvU/Ym4fvm2wgubYtvZU4x/WbC/NWZkuLR6W4dpzwb282UPWd4o/L1YELloStPsIOs9k6SnuTX sZwAA 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" Now that we have all the infrastructure needed, we can add some code that will, for a given connector state and mode, compute the best output format and bpc. The algorithm is the same one than the one already found in i915 and vc4. Signed-off-by: Maxime Ripard --- drivers/gpu/drm/drm_atomic_state_helper.c | 185 +++++++++++++++++++++++++++++- 1 file changed, 181 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c index 0dd1dad99cce..1420d9fdfa35 100644 --- a/drivers/gpu/drm/drm_atomic_state_helper.c +++ b/drivers/gpu/drm/drm_atomic_state_helper.c @@ -670,6 +670,96 @@ static bool hdmi_is_full_range(const struct drm_connector *connector, return drm_default_rgb_quant_range(mode); } +static bool +sink_supports_format_bpc(const struct drm_connector *connector, + const struct drm_display_info *info, + const struct drm_display_mode *mode, + unsigned int format, unsigned int bpc) +{ + struct drm_device *dev = connector->dev; + u8 vic = drm_match_cea_mode(mode); + + if (vic == 1 && bpc != 8) { + drm_dbg(dev, "VIC1 requires a bpc of 8, got %u\n", bpc); + return false; + } + + if (!info->is_hdmi && + (format != HDMI_COLORSPACE_RGB || bpc != 8)) { + drm_dbg(dev, "DVI Monitors require an RGB output at 8 bpc\n"); + return false; + } + + if (!(connector->hdmi.supported_formats & BIT(format))) { + drm_dbg(dev, "%s format unsupported by the connector.\n", + drm_hdmi_connector_get_output_format_name(format)); + return false; + } + + switch (format) { + case HDMI_COLORSPACE_RGB: + drm_dbg(dev, "RGB Format, checking the constraints.\n"); + + if (!(info->color_formats & DRM_COLOR_FORMAT_RGB444)) + return false; + + if (bpc == 10 && !(info->edid_hdmi_rgb444_dc_modes & DRM_EDID_HDMI_DC_30)) { + drm_dbg(dev, "10 BPC but sink doesn't support Deep Color 30.\n"); + return false; + } + + if (bpc == 12 && !(info->edid_hdmi_rgb444_dc_modes & DRM_EDID_HDMI_DC_36)) { + drm_dbg(dev, "12 BPC but sink doesn't support Deep Color 36.\n"); + return false; + } + + drm_dbg(dev, "RGB format supported in that configuration.\n"); + + return true; + + case HDMI_COLORSPACE_YUV422: + drm_dbg(dev, "YUV422 format, checking the constraints.\n"); + + if (!(info->color_formats & DRM_COLOR_FORMAT_YCBCR422)) { + drm_dbg(dev, "Sink doesn't support YUV422.\n"); + return false; + } + + if (bpc != 12) { + drm_dbg(dev, "YUV422 only supports 12 bpc.\n"); + return false; + } + + drm_dbg(dev, "YUV422 format supported in that configuration.\n"); + + return true; + + case HDMI_COLORSPACE_YUV444: + drm_dbg(dev, "YUV444 format, checking the constraints.\n"); + + if (!(info->color_formats & DRM_COLOR_FORMAT_YCBCR444)) { + drm_dbg(dev, "Sink doesn't support YUV444.\n"); + return false; + } + + if (bpc == 10 && !(info->edid_hdmi_ycbcr444_dc_modes & DRM_EDID_HDMI_DC_30)) { + drm_dbg(dev, "10 BPC but sink doesn't support Deep Color 30.\n"); + return false; + } + + if (bpc == 12 && !(info->edid_hdmi_ycbcr444_dc_modes & DRM_EDID_HDMI_DC_36)) { + drm_dbg(dev, "12 BPC but sink doesn't support Deep Color 36.\n"); + return false; + } + + drm_dbg(dev, "YUV444 format supported in that configuration.\n"); + + return true; + } + + return false; +} + static enum drm_mode_status hdmi_clock_valid(const struct drm_connector *connector, const struct drm_display_mode *mode, @@ -714,6 +804,95 @@ hdmi_compute_clock(const struct drm_connector *connector, return 0; } +static bool +hdmi_try_format_bpc(const struct drm_connector *connector, + struct drm_connector_state *state, + const struct drm_display_mode *mode, + unsigned int bpc, enum hdmi_colorspace fmt) +{ + const struct drm_display_info *info = &connector->display_info; + struct drm_device *dev = connector->dev; + int ret; + + drm_dbg(dev, "Trying %s output format\n", + drm_hdmi_connector_get_output_format_name(fmt)); + + if (!sink_supports_format_bpc(connector, info, mode, fmt, bpc)) { + drm_dbg(dev, "%s output format not supported with %u bpc\n", + drm_hdmi_connector_get_output_format_name(fmt), bpc); + return false; + } + + ret = hdmi_compute_clock(connector, state, mode, bpc, fmt); + if (ret) { + drm_dbg(dev, "Couldn't compute clock for %s output format and %u bpc\n", + drm_hdmi_connector_get_output_format_name(fmt), bpc); + return false; + } + + drm_dbg(dev, "%s output format supported with %u (TMDS char rate: %llu Hz)\n", + drm_hdmi_connector_get_output_format_name(fmt), bpc, state->hdmi.tmds_char_rate); + + return true; +} + +static int +hdmi_compute_format(const struct drm_connector *connector, + struct drm_connector_state *state, + const struct drm_display_mode *mode, + unsigned int bpc) +{ + struct drm_device *dev = connector->dev; + + if (hdmi_try_format_bpc(connector, state, mode, bpc, HDMI_COLORSPACE_RGB)) { + state->hdmi.output_format = HDMI_COLORSPACE_RGB; + return 0; + } + + if (hdmi_try_format_bpc(connector, state, mode, bpc, HDMI_COLORSPACE_YUV422)) { + state->hdmi.output_format = HDMI_COLORSPACE_YUV422; + return 0; + } + + drm_dbg(dev, "Failed. No Format Supported for that bpc count.\n"); + + return -EINVAL; +} + +static int +hdmi_compute_config(const struct drm_connector *connector, + struct drm_connector_state *state, + const struct drm_display_mode *mode) +{ + struct drm_device *dev = connector->dev; + unsigned int max_bpc = clamp_t(unsigned int, + state->max_bpc, + 8, connector->max_bpc); + unsigned int bpc; + int ret; + + for (bpc = max_bpc; bpc >= 8; bpc -= 2) { + drm_dbg(dev, "Trying with a %d bpc output\n", bpc); + + ret = hdmi_compute_format(connector, state, mode, bpc); + if (ret) + continue; + + state->hdmi.output_bpc = bpc; + + drm_dbg(dev, + "Mode %ux%u @ %uHz: Found configuration: bpc: %u, fmt: %s, clock: %llu\n", + mode->hdisplay, mode->vdisplay, drm_mode_vrefresh(mode), + state->hdmi.output_bpc, + drm_hdmi_connector_get_output_format_name(state->hdmi.output_format), + state->hdmi.tmds_char_rate); + + return 0; + } + + return -EINVAL; +} + /** * drm_atomic_helper_connector_hdmi_check() - Helper to check HDMI connector atomic state * @connector: DRM Connector @@ -739,10 +918,8 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector, new_state->hdmi.is_full_range = hdmi_is_full_range(connector, new_state); - ret = hdmi_compute_clock(connector, new_state, mode, - new_state->hdmi.output_bpc, - new_state->hdmi.output_format); - if (!ret) + ret = hdmi_compute_config(connector, new_state, mode); + if (ret) return ret; if (old_state->hdmi.broadcast_rgb != new_state->hdmi.broadcast_rgb ||