From nobody Mon Apr 6 00:11:13 2026 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 71133C6FA82 for ; Tue, 13 Sep 2022 08:49:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231254AbiIMItA (ORCPT ); Tue, 13 Sep 2022 04:49:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230452AbiIMIsz (ORCPT ); Tue, 13 Sep 2022 04:48:55 -0400 Received: from ironport.ite.com.tw (60-251-196-230.hinet-ip.hinet.net [60.251.196.230]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 00E03474DF; Tue, 13 Sep 2022 01:48:53 -0700 (PDT) Received: from unknown (HELO mse.ite.com.tw) ([192.168.35.30]) by ironport.ite.com.tw with ESMTP; 13 Sep 2022 16:48:53 +0800 Received: from CSBMAIL1.internal.ite.com.tw (CSBMAIL1.internal.ite.com.tw [192.168.65.58]) by mse.ite.com.tw with ESMTP id 28D8mmT0017680; Tue, 13 Sep 2022 16:48:48 +0800 (GMT-8) (envelope-from allen.chen@ite.com.tw) Received: from VirtualBox.internal.ite.com.tw (192.168.70.46) by CSBMAIL1.internal.ite.com.tw (192.168.65.58) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.14; Tue, 13 Sep 2022 16:48:48 +0800 From: allen CC: Allen Chen , Pin-yen Lin , Jau-Chih Tseng , Kenneth Hung , Hermes Wu , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , Rob Herring , Krzysztof Kozlowski , "open list:DRM DRIVERS" , "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" , open list Subject: [PATCH 1/2] dt-bindings: it6505: add properties to restrict output bandwidth Date: Tue, 13 Sep 2022 16:48:34 +0800 Message-ID: <20220913084835.78490-2-allen.chen@ite.com.tw> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220913084835.78490-1-allen.chen@ite.com.tw> References: <20220913084835.78490-1-allen.chen@ite.com.tw> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [192.168.70.46] X-ClientProxiedBy: CSBMAIL1.internal.ite.com.tw (192.168.65.58) To CSBMAIL1.internal.ite.com.tw (192.168.65.58) X-TM-SNTS-SMTP: 5A61384729631FB07196D8DD218257ABDBFA4925E8D3BF2A3C3656C73319EC6A2002:8 X-MAIL: mse.ite.com.tw 28D8mmT0017680 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: allen chen Add properties to restrict dp output data-lanes and clock. Signed-off-by: Pin-Yen Lin Signed-off-by: Allen Chen --- .../devicetree/bindings/display/bridge/ite,it6505.yaml | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.ya= ml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml index 833d11b2303a..62b9f2192202 100644 --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml @@ -52,6 +52,14 @@ properties: maxItems: 1 description: extcon specifier for the Power Delivery =20 + data-lanes: + maxItems: 1 + description: restrict the dp output data-lanes with value of 1-4 + + max-pixel-clock-khz: + maxItems: 1 + description: restrict max pixel clock + port: $ref: /schemas/graph.yaml#/properties/port description: A port node pointing to DPI host port node @@ -84,6 +92,8 @@ examples: pwr18-supply =3D <&it6505_pp18_reg>; reset-gpios =3D <&pio 179 1>; extcon =3D <&usbc_extcon>; + data-lanes =3D <2>; + max-pixel-clock-khz =3D <150000>; =20 port { it6505_in: endpoint { --=20 2.25.1 From nobody Mon Apr 6 00:11:13 2026 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 EE139C54EE9 for ; Tue, 13 Sep 2022 08:49:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231331AbiIMItD (ORCPT ); Tue, 13 Sep 2022 04:49:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52482 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231202AbiIMIs4 (ORCPT ); Tue, 13 Sep 2022 04:48:56 -0400 Received: from ironport.ite.com.tw (60-251-196-230.hinet-ip.hinet.net [60.251.196.230]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AFC73481C5 for ; Tue, 13 Sep 2022 01:48:55 -0700 (PDT) Received: from unknown (HELO mse.ite.com.tw) ([192.168.35.30]) by ironport.ite.com.tw with ESMTP; 13 Sep 2022 16:48:54 +0800 Received: from CSBMAIL1.internal.ite.com.tw (CSBMAIL1.internal.ite.com.tw [192.168.65.58]) by mse.ite.com.tw with ESMTP id 28D8mnYw017681; Tue, 13 Sep 2022 16:48:49 +0800 (GMT-8) (envelope-from allen.chen@ite.com.tw) Received: from VirtualBox.internal.ite.com.tw (192.168.70.46) by CSBMAIL1.internal.ite.com.tw (192.168.65.58) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2176.14; Tue, 13 Sep 2022 16:48:50 +0800 From: allen CC: Allen Chen , Pin-yen Lin , Jau-Chih Tseng , Kenneth Hung , Hermes Wu , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , "open list:DRM DRIVERS" , open list Subject: [PATCH 2/2] drm/bridge: add it6505 driver to read data-lanes and max-pixel-clock-khz from dt Date: Tue, 13 Sep 2022 16:48:35 +0800 Message-ID: <20220913084835.78490-3-allen.chen@ite.com.tw> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220913084835.78490-1-allen.chen@ite.com.tw> References: <20220913084835.78490-1-allen.chen@ite.com.tw> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [192.168.70.46] X-ClientProxiedBy: CSBMAIL1.internal.ite.com.tw (192.168.65.58) To CSBMAIL1.internal.ite.com.tw (192.168.65.58) X-TM-SNTS-SMTP: 069AB609ACB3102B3EBC13ACA92CA85376184F7D7B3ADB0003D6A1F4488D40972002:8 X-MAIL: mse.ite.com.tw 28D8mnYw017681 To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: allen chen Add driver to read data-lanes and max-pixel-clock-khz from dt property to restrict output bandwidth. Signed-off-by: Allen chen Signed-off-by: Pin-yen Lin --- drivers/gpu/drm/bridge/ite-it6505.c | 35 ++++++++++++++++++++++++++--- 1 file changed, 32 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/i= te-it6505.c index 2767b70fa2cb..cfa25a176a29 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -436,6 +436,8 @@ struct it6505 { bool powered; bool hpd_state; u32 afe_setting; + u32 max_dpi_pixel_clock; + u32 max_lane_count; enum hdcp_state hdcp_status; struct delayed_work hdcp_work; struct work_struct hdcp_wait_ksv_list; @@ -1475,7 +1477,8 @@ static void it6505_parse_link_capabilities(struct it6= 505 *it6505) it6505->lane_count =3D link->num_lanes; DRM_DEV_DEBUG_DRIVER(dev, "Sink support %d lanes training", it6505->lane_count); - it6505->lane_count =3D min_t(int, it6505->lane_count, MAX_LANE_COUNT); + it6505->lane_count =3D min_t(int, it6505->lane_count, + it6505->max_lane_count); =20 it6505->branch_device =3D drm_dp_is_branch(it6505->dpcd); DRM_DEV_DEBUG_DRIVER(dev, "Sink %sbranch device", @@ -2901,7 +2904,7 @@ it6505_bridge_mode_valid(struct drm_bridge *bridge, if (mode->flags & DRM_MODE_FLAG_INTERLACE) return MODE_NO_INTERLACE; =20 - if (mode->clock > DPI_PIXEL_CLK_MAX) + if (mode->clock > it6505->max_dpi_pixel_clock) return MODE_CLOCK_HIGH; =20 it6505->video_info.clock =3D mode->clock; @@ -3066,6 +3069,8 @@ static void it6505_parse_dt(struct it6505 *it6505) { struct device *dev =3D &it6505->client->dev; u32 *afe_setting =3D &it6505->afe_setting; + u32 *max_lane_count =3D &it6505->max_lane_count; + u32 *max_dpi_pixel_clock =3D &it6505->max_dpi_pixel_clock; =20 it6505->lane_swap_disabled =3D device_property_read_bool(dev, "no-laneswap"); @@ -3081,7 +3086,31 @@ static void it6505_parse_dt(struct it6505 *it6505) } else { *afe_setting =3D 0; } - DRM_DEV_DEBUG_DRIVER(dev, "using afe_setting: %d", *afe_setting); + + if (device_property_read_u32(dev, "data-lanes", + max_lane_count) =3D=3D 0) { + if (*max_lane_count > 4 || *max_lane_count =3D=3D 3) { + dev_err(dev, "max lane count error, use default"); + *max_lane_count =3D MAX_LANE_COUNT; + } + } else { + *max_lane_count =3D MAX_LANE_COUNT; + } + + if (device_property_read_u32(dev, "max-pixel-clock-khz", + max_dpi_pixel_clock) =3D=3D 0) { + if (*max_dpi_pixel_clock > 297000) { + dev_err(dev, "max pixel clock error, use default"); + *max_dpi_pixel_clock =3D DPI_PIXEL_CLK_MAX; + } + } else { + *max_dpi_pixel_clock =3D DPI_PIXEL_CLK_MAX; + } + + DRM_DEV_DEBUG_DRIVER(dev, "using afe_setting: %u, max_lane_count: %u", + it6505->afe_setting, it6505->max_lane_count); + DRM_DEV_DEBUG_DRIVER(dev, "using max_dpi_pixel_clock: %u kHz", + it6505->max_dpi_pixel_clock); } =20 static ssize_t receive_timing_debugfs_show(struct file *file, char __user = *buf, --=20 2.25.1