[{"id":37478,"web_url":"https://patchwork.libcamera.org/comment/37478/","msgid":"","date":"2026-01-05T14:04:21","subject":"Re: [PATCH v3] ipa: simple: fix minimal analog gain init","submitter":{"id":242,"url":"https://patchwork.libcamera.org/api/people/242/","name":"Hans de Goede","email":"johannes.goede@oss.qualcomm.com"},"content":"Hi,\n\nOn 5-Jan-26 14:57, Vasiliy Doylov wrote:\n> On most imx sensors the formula seems to be:\n> \n> again_float = 512.0 / (512.0 - again_ctrl_value)\n> \n> So the minimum again of 0 makes sense and actually translates to a gain of 1.0.\n> And the max gain of 400 leads to 512.0 / 112.0 = 4.57 which is about typical for\n> a maximum again. Since a minimum again value of 0 is actually normal, the special\n> handling of againMin == 0 is undesirable and this is actually causing problems\n> on these IMX sensors. again10 correctly gets set to 0 which is less then the\n> adjusted againMin which causes the AGC code to not work properly.\n> \n> Fix this by dropping the special handling of againMin == 0.\n> \n> Signed-off-by: Vasiliy Doylov \n\nThanks, patch looks good to me:\n\nReviewed-by: Hans de Goede \n\nRegards,\n\nHans\n\n\n\n> ---\n> Changes in v3:\n> - Expanded commit message\n> - Link to v2: https://lists.libcamera.org/pipermail/libcamera-devel/2026-January/056068.html\n> \n> Changes in v2:\n> - Drop old solution\n> - Fix minimal analog gain initialisation\n> - Link to v1: https://lists.libcamera.org/pipermail/libcamera-devel/2026-January/056045.html\n> ---\n> src/ipa/simple/soft_simple.cpp | 19 +------------------\n> 1 file changed, 1 insertion(+), 18 deletions(-)\n> \n> diff --git a/src/ipa/simple/soft_simple.cpp b/src/ipa/simple/soft_simple.cpp\n> index b147aca2..dde11666 100644\n> --- a/src/ipa/simple/soft_simple.cpp\n> +++ b/src/ipa/simple/soft_simple.cpp\n> @@ -237,26 +237,9 @@ int IPASoftSimple::configure(const IPAConfigInfo &configInfo)\n> \t\t\t\tcamHelper_->blackLevel().value() / 256;\n> \t\t}\n> \t} else {\n> -\t\t/*\n> -\t\t * The camera sensor gain (g) is usually not equal to the value written\n> -\t\t * into the gain register (x). But the way how the AGC algorithm changes\n> -\t\t * the gain value to make the total exposure closer to the optimum\n> -\t\t * assumes that g(x) is not too far from linear function. If the minimal\n> -\t\t * gain is 0, the g(x) is likely to be far from the linear, like\n> -\t\t * g(x) = a / (b * x + c). To avoid unexpected changes to the gain by\n> -\t\t * the AGC algorithm (abrupt near one edge, and very small near the\n> -\t\t * other) we limit the range of the gain values used.\n> -\t\t */\n> \t\tcontext_.configuration.agc.againMax = againMax;\n> \t\tcontext_.configuration.agc.again10 = againDef;\n> -\t\tif (againMin) {\n> -\t\t\tcontext_.configuration.agc.againMin = againMin;\n> -\t\t} else {\n> -\t\t\tLOG(IPASoft, Warning)\n> -\t\t\t\t<< \"Minimum gain is zero, that can't be linear\";\n> -\t\t\tcontext_.configuration.agc.againMin =\n> -\t\t\t\tstd::min(100, againMin / 2 + againMax / 2);\n> -\t\t}\n> +\t\tcontext_.configuration.agc.againMin = againMin;\n> \t\tcontext_.configuration.agc.againMinStep = 1.0;\n> \t}\n> \n> \n> ---\n> base-commit: 2861817f09c96a0660b88783eff159631e42030f\n> change-id: 20260105-softisp-agc-16d01cb3da49\n> \n> Best regards,","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 AC736BDCBF\n\tfor ;\n\tMon, 5 Jan 2026 14:04:31 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id C0D6761FBF;\n\tMon, 5 Jan 2026 15:04:30 +0100 (CET)","from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com\n\t[205.220.168.131])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 9155D61F35\n\tfor ;\n\tMon, 5 Jan 2026 15:04:28 +0100 (CET)","from pps.filterd (m0279867.ppops.net [127.0.0.1])\n\tby mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id\n\t6058wKMF594188 for ;\n\tMon, 5 Jan 2026 14:04:27 GMT","from mail-yw1-f197.google.com (mail-yw1-f197.google.com\n\t[209.85.128.197])\n\tby mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4bga8pgs45-1\n\t(version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT)\n\tfor ;\n\tMon, 05 Jan 2026 14:04:26 +0000 (GMT)","by mail-yw1-f197.google.com with SMTP id\n\t00721157ae682-78d6b5d45beso24483157b3.1\n\tfor ;\n\tMon, 05 Jan 2026 06:04:26 -0800 (PST)","from ?IPV6:2001:1c00:c32:7800:5bfa:a036:83f0:f9ec?\n\t(2001-1c00-0c32-7800-5bfa-a036-83f0-f9ec.cable.dynamic.v6.ziggo.nl.\n\t[2001:1c00:c32:7800:5bfa:a036:83f0:f9ec])\n\tby smtp.gmail.com with ESMTPSA id\n\t4fb4d7f45d1cf-64b90f53be0sm53414301a12.2.2026.01.05.06.04.22\n\t(version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128);\n\tMon, 05 Jan 2026 06:04:22 -0800 (PST)"],"Authentication-Results":"lancelot.ideasonboard.com; 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\n\tMon, 05 Jan 2026 06:04:25 -0800 (PST)","by 2002:a05:690e:1206:b0:645:5a48:598a with SMTP id\n\t956f58d0204a3-646e341aab1mr5330335d50.29.1767621863092; \n\tMon, 05 Jan 2026 06:04:23 -0800 (PST)"],"X-Google-Smtp-Source":"AGHT+IGmxd/RP4ng/H/2sbTnv+18HgfKc1QyTCTGIFVVGuFfkoOxxmY2TO7rIYqim8N6XSIIB/td4Q==","Message-ID":"","Date":"Mon, 5 Jan 2026 15:04:21 +0100","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","From":"johannes.goede@oss.qualcomm.com","Subject":"Re: [PATCH v3] ipa: simple: fix minimal analog gain init","To":"Vasiliy Doylov ,\n\tlibcamera-devel@lists.libcamera.org","References":"<20260105-softisp-agc-v3-1-434f2053c549@mainlining.org>","Content-Language":"en-US, nl","In-Reply-To":"<20260105-softisp-agc-v3-1-434f2053c549@mainlining.org>","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"7bit","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwMTA1MDEyMyBTYWx0ZWRfX6kOFgksXbPGW\n\tKQkysKCBRNTIv3r/we4BSs2WXSD9dcF4/nLveSilcXFndFOLF/V1Ms3JyBgiBQRJxknr0FX98XF\n\tY3iPum0NUUIkF3f6zKLLAcKR9baFTV2J4ici+YH30+wbA/psMU28209CitTTUjK+hUviLkl8QJk\n\tIcXRtBfZ43EqrbiqWdzgCJkKsuLzYid+9nrX9TBIqPeQXPty3B0TRAhfS6QyYtlMTmnilkqQNU4\n\tagBPYHTZruKaNQWcdFuNKJ6SAHHP5BC8ICgbRo6+IajH7ROh8cSmzF0+YdocJCVEBA3S6O62iXF\n\tzE+aluftzRYQoG3JPHzY7N6YQUsTxrjTyW8MJrSylORHN9k0eN3Ijmh5ynvcgIqlFyitfNrG4K7\n\tDgyfeQSWEyGbkXQUK8g2iUk7wQQzoYRmb+7PYOYm8Nc8Sl/pJDzFSi9l27bW4BXsknDKNkVTCto\n\tYXHN9QMlwvH5nfOm0tw==","X-Authority-Analysis":"v=2.4 cv=JfWxbEKV c=1 sm=1 tr=0 ts=695bc4ea cx=c_pps\n\ta=0mLRTIufkjop4KoA/9S1MA==:117 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10\n\ta=vUbySO9Y5rIA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22\n\ta=YAyIRdgMAAAA:8 a=OuZLqq7tAAAA:8 a=EUspDBNiAAAA:8\n\ta=awiks7oCl5yZ3YqcxCYA:9\n\ta=QEXdDO2ut3YA:10 a=OK39Zfm0yZwA:10 a=SX4dUu0mqi8A:10\n\ta=WgItmB6HBUc_1uVUp3mg:22 a=o1rO4XtwZBNj6n05oSJ_:22\n\ta=AKGiAy9iJ-JzxKVHQNES:22","X-Proofpoint-ORIG-GUID":"k7f632wNxyeJBq_VPFLNi56tZ2vducX4","X-Proofpoint-GUID":"k7f632wNxyeJBq_VPFLNi56tZ2vducX4","X-Proofpoint-Virus-Version":"vendor=baseguard\n\tengine=ICAP:2.0.293, Aquarius:18.0.1121, Hydra:6.1.9,\n\tFMLib:17.12.100.49\n\tdefinitions=2026-01-05_01,2026-01-05_01,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n\tbulkscore=0 adultscore=0 suspectscore=0 clxscore=1015\n\tpriorityscore=1501\n\tmalwarescore=0 lowpriorityscore=0 spamscore=0 impostorscore=0\n\tphishscore=0\n\tclassifier=typeunknown authscore=0 authtc= authcc= route=outbound\n\tadjust=0\n\treason=mlx scancount=1 engine=8.22.0-2512120000\n\tdefinitions=main-2601050123","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\" "}},{"id":37481,"web_url":"https://patchwork.libcamera.org/comment/37481/","msgid":"<85bjj8jf92.fsf@mzamazal-thinkpadp1gen7.tpbc.csb>","date":"2026-01-05T14:39:05","subject":"Re: [PATCH v3] ipa: simple: fix minimal analog gain init","submitter":{"id":177,"url":"https://patchwork.libcamera.org/api/people/177/","name":"Milan Zamazal","email":"mzamazal@redhat.com"},"content":"Vasiliy Doylov writes:\n\n> On most imx sensors the formula seems to be:\n>\n> again_float = 512.0 / (512.0 - again_ctrl_value)\n>\n> So the minimum again of 0 makes sense and actually translates to a gain of 1.0.\n> And the max gain of 400 leads to 512.0 / 112.0 = 4.57 which is about typical for\n> a maximum again. Since a minimum again value of 0 is actually normal, the special\n> handling of againMin == 0 is undesirable and this is actually causing problems\n> on these IMX sensors. again10 correctly gets set to 0 which is less then the\n\ns/then/than/\n\n(No need to resubmit because of this.)\n\n> adjusted againMin which causes the AGC code to not work properly.\n>\n> Fix this by dropping the special handling of againMin == 0.\n>\n> Signed-off-by: Vasiliy Doylov \n> ---\n> Changes in v3:\n> - Expanded commit message\n> - Link to v2: https://lists.libcamera.org/pipermail/libcamera-devel/2026-January/056068.html\n>\n> Changes in v2:\n> - Drop old solution\n> - Fix minimal analog gain initialisation\n> - Link to v1: https://lists.libcamera.org/pipermail/libcamera-devel/2026-January/056045.html\n> ---\n> src/ipa/simple/soft_simple.cpp | 19 +------------------\n> 1 file changed, 1 insertion(+), 18 deletions(-)\n>\n> diff --git a/src/ipa/simple/soft_simple.cpp b/src/ipa/simple/soft_simple.cpp\n> index b147aca2..dde11666 100644\n> --- a/src/ipa/simple/soft_simple.cpp\n> +++ b/src/ipa/simple/soft_simple.cpp\n> @@ -237,26 +237,9 @@ int IPASoftSimple::configure(const IPAConfigInfo &configInfo)\n> \t\t\t\tcamHelper_->blackLevel().value() / 256;\n> \t\t}\n> \t} else {\n> -\t\t/*\n> -\t\t * The camera sensor gain (g) is usually not equal to the value written\n> -\t\t * into the gain register (x). But the way how the AGC algorithm changes\n> -\t\t * the gain value to make the total exposure closer to the optimum\n> -\t\t * assumes that g(x) is not too far from linear function. If the minimal\n> -\t\t * gain is 0, the g(x) is likely to be far from the linear, like\n> -\t\t * g(x) = a / (b * x + c). To avoid unexpected changes to the gain by\n> -\t\t * the AGC algorithm (abrupt near one edge, and very small near the\n> -\t\t * other) we limit the range of the gain values used.\n> -\t\t */\n\nI guess it was put there for a reason but the workaround still looks\nweird and if the fix works, let's take it.\n\nReviewed-by: Milan Zamazal \n\n> \t\tcontext_.configuration.agc.againMax = againMax;\n> \t\tcontext_.configuration.agc.again10 = againDef;\n> -\t\tif (againMin) {\n> -\t\t\tcontext_.configuration.agc.againMin = againMin;\n> -\t\t} else {\n> -\t\t\tLOG(IPASoft, Warning)\n> -\t\t\t\t<< \"Minimum gain is zero, that can't be linear\";\n> -\t\t\tcontext_.configuration.agc.againMin =\n> -\t\t\t\tstd::min(100, againMin / 2 + againMax / 2);\n> -\t\t}\n> +\t\tcontext_.configuration.agc.againMin = againMin;\n> \t\tcontext_.configuration.agc.againMinStep = 1.0;\n> \t}\n> \n>\n> ---\n> base-commit: 2861817f09c96a0660b88783eff159631e42030f\n> change-id: 20260105-softisp-agc-16d01cb3da49\n>\n> Best regards,","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 5FC8DBDCC0\n\tfor ;\n\tMon, 5 Jan 2026 14:39:16 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 6A18261F9F;\n\tMon, 5 Jan 2026 15:39:15 +0100 (CET)","from us-smtp-delivery-124.mimecast.com\n\t(us-smtp-delivery-124.mimecast.com [170.10.129.124])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 493C361F35\n\tfor ;\n\tMon, 5 Jan 2026 15:39:13 +0100 (CET)","from mail-lf1-f69.google.com (mail-lf1-f69.google.com\n\t[209.85.167.69]) by relay.mimecast.com with ESMTP with STARTTLS\n\t(version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id\n\tus-mta-651-AffedTwhM5eQbvVvbm4mKQ-1; Mon, 05 Jan 2026 09:39:10 -0500","by mail-lf1-f69.google.com with SMTP id\n\t2adb3069b0e04-59a1d3ad322so8199153e87.1\n\tfor ;\n\tMon, 05 Jan 2026 06:39:10 -0800 (PST)","from mzamazal-thinkpadp1gen7.tpbc.csb\n\t(ip-77-48-47-2.net.vodafone.cz. 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