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(unknown [58.22.7.114]) by smtp.qiye.163.com (Hmail) with ESMTP id 4bab2d5be; Fri, 28 Aug 2026 14:52:09 +0800 (GMT+08:00) From: Damon Ding To: Andrzej Hajda , Neil Armstrong , Robert Foss , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sandy Huang , Heiko Stuebner , Andy Yan Cc: Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Dmitry Baryshkov , Marek Szyprowski , Sebastian Reichel , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Damon Ding Subject: [PATCH v8 4/5] drm/bridge: analogix_dp: Add validation for samsung,lane-count property Date: Fri, 28 Aug 2026 14:51:52 +0800 Message-Id: <20260828065153.590802-5-damon.ding@rock-chips.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260828065153.590802-1-damon.ding@rock-chips.com> References: <20260828065153.590802-1-damon.ding@rock-chips.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-HM-Tid: 0aa04723e4b303a8kunm9cc188d5188370 X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFDSUNOT01LS0k3V1kYFggdWUFKV1ktWUFJV1kPCRoVCBIfWUFZGU1DSVZOHh5MTEpCQk saGUhWFRQJFhoXVRMBExYaEhckFA4PWVdZGBILWUFZTkNVSUlVTFVKSk9ZV1kWGg8SFR0UWUFZT0 tIVUpLSU9PT0hVSktLVUpCS0tZBg++ DKIM-Signature: a=rsa-sha256; b=KVkwSm5di3V6qSiThNRmucxAg335yGzJyOAchgHUR/WdaUY42A0nLiI6EVs/yylLilGbMJLmnLKwQ/VTt2u2ENAygyJqa62QdkGGlbBLdzWfOI4oMFC+fEeh+AjTYvhj2Cg30WqlBe3Fw0nW/Fm1ypcYVVZP7AYNtZawTtHSOwQ=; c=relaxed/relaxed; s=default; d=rock-chips.com; v=1; bh=sufZXYFvhqt99gCkQ0mCK5s0oy3fyCr/7BG8YjyOEgU=; h=date:mime-version:subject:message-id:from; X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260827_235215_180807_D905345B X-CRM114-Status: UNSURE ( 8.61 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add validity check for samsung,lane-count to ensure DT-provided lane count values are specification-compliant. Suggested-by: Luca Ceresoli Reviewed-by: Luca Ceresoli Signed-off-by: Damon Ding --- Changes in v5: - Apply DRM DP helper API to check the validity of DP lane count. Changes in v6: - Rebase after the new commit for restoring mandatory properties samsung,link-rate and samsung,lane-count. Changes in v7: - Add Reviewed-by tag. --- drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index ddb15d6de05f..a74c855936b2 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c @@ -1274,7 +1274,8 @@ static int analogix_dp_dt_parse_pdata(struct analogix_dp_device *dp) return dev_err_probe(dp->dev, -EINVAL, "Failed to get samsung,link-rate\n"); video_info->max_link_rate = val; - if (of_property_read_u32(dp_node, "samsung,lane-count", &val)) + if (of_property_read_u32(dp_node, "samsung,lane-count", &val) || + !drm_dp_lane_count_is_valid(val)) return dev_err_probe(dp->dev, -EINVAL, "Failed to get samsung,lane-count\n"); video_info->max_lane_count = val; -- 2.34.1