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Mon, 09 Nov 2026 09:30:06 -0800 (PST) Received: from [127.0.0.1] ([85.204.204.133]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-49835859080sm143645f8f.19.2026.11.09.09.30.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 09 Nov 2026 09:30:05 -0800 (PST) From: Ana Bobillo To: u-boot@lists.u-boot-project.org Cc: Tom Rini , Anatolij Gustschin , Simon Glass , Kever Yang , Quentin Schulz , Andre Przywara , Thierry Reding , Svyatoslav Ryhel , Tom Warren , Patrick Delaunay , Patrice Chotard , uboot-stm32@st-md-mailman.stormreply.com, Neil Armstrong , =?UTF-8?Q?Jonas_Schw=C3=B6bel?= Subject: [PATCH 10/11] video: rockchip: edp: Limit the lane count to four Date: Mon, 09 Nov 2026 17:30:04 +0000 Message-ID: <2a110264-af9c-4bba-bcef-6efc436f63c8@gmail.com> In-Reply-To: <2399d63c-ddd0-44b0-bb81-d5d9d2a8a8b4@gmail.com> References: <2399d63c-ddd0-44b0-bb81-d5d9d2a8a8b4@gmail.com> X-BeenThere: u-boot@lists.u-boot-project.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: U-Boot discussion List-Archive: List-Post: List-Help: List-Subscribe: , X-Spam-Status: No, score=-12.9 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 X-Archived-By: From: Ana Bobillo rk_edp_init_training() takes the lane count from the sink's MAX_LANE_COUNT DPCD register, masked to 5 bits, and link training uses it to index the four ln_link_trn_ctl[] registers, the four-entry train_set[] and the link status read from the sink. A sink reporting more than four lanes makes rk_edp_set_link_training() write past those registers into the ones after them, and the training loops read past train_set[] and the link status buffer. Limit the lane count to the four lanes the controller has, as the analogix_dp driver in Linux does. Fixes: 5852d539eab0 ("rockchip: video: Add a display driver for rockchip eDP") Signed-off-by: Ana Bobillo --- drivers/video/rockchip/rk_edp.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/video/rockchip/rk_edp.c b/drivers/video/rockchip/rk_edp.c index 0ba68dbce3d..85c201e8809 100644 --- a/drivers/video/rockchip/rk_edp.c +++ b/drivers/video/rockchip/rk_edp.c @@ -646,6 +646,10 @@ static int rk_edp_init_training(struct rk_edp_priv *edp) return -EPERM; } + /* The sink may report more lanes than the controller has */ + if (edp->link_train.lane_count > LANE_CNT4) + edp->link_train.lane_count = LANE_CNT4; + ret = rk_edp_link_power_up(edp); if (ret) return ret;