{"id":27531,"url":"https://patchwork.libcamera.org/api/patches/27531/?format=json","web_url":"https://patchwork.libcamera.org/patch/27531/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"","date":"2026-07-31T15:15:47","name":"[v4,1/2] libipa: camera_sensor_helper: Add imx471","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"85076e13057d1408688de336af1d97d8ed3bc24e","submitter":{"id":476,"url":"https://patchwork.libcamera.org/api/people/476/?format=json","name":"John Cronin","email":"john@stromback.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/27531/mbox/","series":[{"id":6097,"url":"https://patchwork.libcamera.org/api/series/6097/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=6097","date":"2026-07-31T15:15:05","name":"Add imx471 soft-ISP sensor support","version":4,"mbox":"https://patchwork.libcamera.org/series/6097/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/27531/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/27531/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 0A45BBDE4C\n\tfor ;\n\tFri, 31 Jul 2026 15:15:53 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id AB20067FDD;\n\tFri, 31 Jul 2026 17:15:52 +0200 (CEST)","from mail-yw1-x1130.google.com (mail-yw1-x1130.google.com\n\t[IPv6:2607:f8b0:4864:20::1130])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 1A9EA67FD6\n\tfor ;\n\tFri, 31 Jul 2026 17:15:51 +0200 (CEST)","by mail-yw1-x1130.google.com with SMTP id\n\t00721157ae682-81f36179dd5so15372457b3.2\n\tfor ;\n\tFri, 31 Jul 2026 08:15:51 -0700 (PDT)","from 313336824172 named unknown by gmailapi.google.com with\n\tHTTPREST; 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charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"Add CameraSensorHelper for Sony IMX471 (SONY471A), used on Lenovo\nThinkPad X9 / X1 Carbon Gen14 and related IPU7 platforms.\n\nThe kernel imx471 driver writes V4L2_CID_ANALOGUE_GAIN codes 0..800\ndirectly to register 0x0204.\n\nAnalogue gain model (measured on ThinkPad X9-15 Gen 1, Fedora 44,\nkernel 7.1.5): fixed-exposure raw Bayer means track\n\n G = 1024 / (1024 - code)\n\nwithin ~1.5% over codes 0..800 (best-fit k≈1023 for G=k/(k-code)).\nCode 800 implies ~4.57x; that is the driver's V4L2 max under this\nmodel, not a full-scale datasheet claim. Other IMX helpers using the\nsame formula expose higher max codes (e.g. imx355 960 → ~16x).\n\nBlack level measured ~64 DN at 10-bit on min exposure/gain raw frames\n(mean ≈ 64.1, p50 = 64) → 4096 at 16-bit.\n\nSoft-ISP loads without \"Failed to create camera sensor helper for\nimx471\".\n\nSigned-off-by: John Cronin \n---\n src/ipa/libipa/camera_sensor_helper.cpp | 29 +++++++++++++++++++++++++\n 1 file changed, 29 insertions(+)\n\n public:","diff":"diff --git a/src/ipa/libipa/camera_sensor_helper.cpp\nb/src/ipa/libipa/camera_sensor_helper.cpp\nindex cc16e25..31d8169 100644\n--- a/src/ipa/libipa/camera_sensor_helper.cpp\n+++ b/src/ipa/libipa/camera_sensor_helper.cpp\n@@ -644,6 +644,35 @@ class CameraSensorHelperImx462 : public\nCameraSensorHelperImx290\n };\n REGISTER_CAMERA_SENSOR_HELPER(\"imx462\", CameraSensorHelperImx462)\n\n+class CameraSensorHelperImx471 : public CameraSensorHelper\n+{\n+public:\n+\tCameraSensorHelperImx471()\n+\t{\n+\t\t/*\n+\t\t * Sony IMX471 (IPU7 platforms: ThinkPad X9 / X1 Carbon Gen14,\n+\t\t * ACPI SONY471A).\n+\t\t *\n+\t\t * Kernel imx471 writes V4L2_CID_ANALOGUE_GAIN directly to\n+\t\t * register 0x0204 with range 0..800 (IMX471_ANA_GAIN_MIN/MAX).\n+\t\t *\n+\t\t * Analogue gain model (measured on ThinkPad X9-15 Gen 1):\n+\t\t * G = 1024 / (1024 - code)\n+\t\t * Fixed exposure raw Bayer means (black-subtracted) track this\n+\t\t * model within ~1.5% over codes 0..800 (best-fit k≈1023 for\n+\t\t * G=k/(k-code)). Code 800 → ~4.57x is the driver max, not a\n+\t\t * datasheet \"full range\" claim; other IMX helpers with the same\n+\t\t * formula use higher max codes (e.g. imx355 code 960 → ~16x).\n+\t\t *\n+\t\t * Black level: measured ~64 DN at 10-bit on min exposure/gain\n+\t\t * raw frames (mean≈64.1, p50=64) → 4096 at 16-bit.\n+\t\t */\n+\t\tblackLevel_ = 4096;\n+\t\tgain_ = AnalogueGainLinear{ 0, 1024, -1, 1024 };\n+\t}\n+};\n+REGISTER_CAMERA_SENSOR_HELPER(\"imx471\", CameraSensorHelperImx471)\n+\n class CameraSensorHelperImx477 : public CameraSensorHelper\n {\n","prefixes":["v4","1/2"]}