From patchwork Wed Sep 20 14:35:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 724746 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 33B80C0031C for ; Wed, 20 Sep 2023 14:36:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236555AbjITOgc (ORCPT ); Wed, 20 Sep 2023 10:36:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55770 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236489AbjITOgW (ORCPT ); Wed, 20 Sep 2023 10:36:22 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 00FA41B0; Wed, 20 Sep 2023 07:36:11 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2C8C8C433CA; Wed, 20 Sep 2023 14:36:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1695220571; bh=C/xF5Qf5LEEpxL3F1aDSqoe3Qetbk4k3uiVfkCBFhS8=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=jFlpWGvnAu3c8VCaqiXvfM/KJY/Zv97ApBzUJduBbmyTCBkffpPA6/rRAaYPuePwg AmZg5to90CbpahquxXCOgA4h5V/o9MqngRZI7YpMimc7SAZWLlOegHZZlz1pY8CUZp IgGSm1pBQQzRaTn8xvmTvrg8hpf02AeNosbzl0sA+UBLtQhp6OYa84GzPUXC+hFFyD rtt/7Y5NV7IioOSMIs2VtMXWGErd/iuKXwR+IMts1cECvRVTcGXHRZZD56pTnxQh/M A95Rr1whQMCPXBROMwSqzY3FMQVM6IdnP8j9Pips606GHeep264P/rK/JKEGd9cllP E8mKhKmTH8Uew== From: Maxime Ripard Date: Wed, 20 Sep 2023 16:35:25 +0200 Subject: [PATCH RFC v2 10/37] drm/connector: hdmi: Compute bpc and format automatically MIME-Version: 1.0 Message-Id: <20230920-kms-hdmi-connector-state-v2-10-17932daddd7d@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 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=6421; i=mripard@kernel.org; h=from:subject:message-id; bh=C/xF5Qf5LEEpxL3F1aDSqoe3Qetbk4k3uiVfkCBFhS8=; b=owGbwMvMwCX2+D1vfrpE4FHG02pJDKnczJaeG/j1NjeXlb0Sja2awZqfWMYcdfXSqpPCdQ+8+ H/ZChd0lLIwiHExyIopssQImy+JOzXrdScb3zyYOaxMIEMYuDgFYCLlNxkZzl75+vnF7dsiL/9e yV/B1+1rPi+S2WLJr8kT/NX8Ze9/yGD4wx11K7wkzpeT2Wuicerj/sLj9YyNC/klPvvu6d0StPs /BwA= X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org 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 | 174 +++++++++++++++++++++++++++++- 1 file changed, 171 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic_state_helper.c b/drivers/gpu/drm/drm_atomic_state_helper.c index 9539b952fd8c..2f85422cccd4 100644 --- a/drivers/gpu/drm/drm_atomic_state_helper.c +++ b/drivers/gpu/drm/drm_atomic_state_helper.c @@ -635,6 +635,96 @@ connector_state_get_adjusted_mode(const struct drm_connector_state *state) return &crtc_state->adjusted_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, @@ -669,6 +759,86 @@ 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 output format %s\n", + drm_hdmi_connector_get_output_format_name(fmt)); + + if (!sink_supports_format_bpc(connector, info, mode, fmt, bpc)) + return false; + + ret = hdmi_compute_clock(connector, state, mode, bpc, fmt); + if (ret) + return false; + + 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 @@ -692,9 +862,7 @@ int drm_atomic_helper_connector_hdmi_check(struct drm_connector *connector, 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); + ret = hdmi_compute_config(connector, new_state, mode); if (!ret) return ret;