[{"id":36506,"web_url":"https://patchwork.libcamera.org/comment/36506/","msgid":"","date":"2025-10-28T08:58:11","subject":"Re: [PATCH] ipa: rpi: vd56g3: Fix frameIntegrationDiff value","submitter":{"id":143,"url":"https://patchwork.libcamera.org/api/people/143/","name":"Jacopo Mondi","email":"jacopo.mondi@ideasonboard.com"},"content":"Hi Benjamin\n\nOn Tue, Oct 28, 2025 at 09:46:50AM +0100, Benjamin Mugnier wrote:\n> In the vd56g3 user manual :\n>\n> MAX_EXPOSURE_COARSE = FRAME_LENGTH − EXP_COARSE_INTG_MARGIN − 7\n> EXP_COARSE_INTG_MARGIN >= 68\n>\n> Therefore, frameIntegrationDiff is EXP_COARSE_INTG_MARGIN + 7, equals\n> 75. This value is coherent with the VD56G3_EXPOSURE_MARGIN in the kernel\n> driver source code.\n>\n> Reported-by: Jacopo Mondi \n> Signed-off-by: Benjamin Mugnier \n\nThanks for the fix\n\nReviewed-by: Jacopo Mondi \n> ---\n> src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp | 2 +-\n> 1 file changed, 1 insertion(+), 1 deletion(-)\n>\n> diff --git a/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp b/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n> index 140aabd802ad..8a58bc746711 100644\n> --- a/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n> +++ b/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n> @@ -23,7 +23,7 @@ private:\n> \t * Smallest difference between the frame length and integration time,\n> \t * in units of lines.\n> \t */\n> -\tstatic constexpr int frameIntegrationDiff = 61;\n> +\tstatic constexpr int frameIntegrationDiff = 75;\n> };\n>\n> CamHelperVd56g3::CamHelperVd56g3()\n> --\n> 2.25.1\n>","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 25BB4BE080\n\tfor ;\n\tTue, 28 Oct 2025 08:58:18 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 12E906079D;\n\tTue, 28 Oct 2025 09:58:17 +0100 (CET)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 85197603ED\n\tfor ;\n\tTue, 28 Oct 2025 09:58:15 +0100 (CET)","from ideasonboard.com (mob-5-90-58-13.net.vodafone.it [5.90.58.13])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 68BE916CD;\n\tTue, 28 Oct 2025 09:56:26 +0100 (CET)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"MEqFYJc9\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1761641787;\n\tbh=RxKuDx1WOpSzFxGsSYClwXwgwTxW7R9HPWY6DOc1aCs=;\n\th=Date:From:To:Cc:Subject:References:In-Reply-To:From;\n\tb=MEqFYJc9SscfMZ4FKjStTYE/ogQlAaB8fMIEq+ITkHcjcDasUAqjg9sE3xQhAOO0y\n\toXS+7jW9PAqBLQP43LDTr3VeV4OFXLWMp545LV8QI9jeaV8EBrk+kFnZXRZ79AJ3MY\n\tmDrkU8GMIGQ5Qw/5pMrK8+efnx4bi+fVFx1gRSWo=","Date":"Tue, 28 Oct 2025 09:58:11 +0100","From":"Jacopo Mondi ","To":"Benjamin Mugnier ","Cc":"libcamera-devel@lists.libcamera.org, \n\tJacopo Mondi ","Subject":"Re: [PATCH] ipa: rpi: vd56g3: Fix frameIntegrationDiff value","Message-ID":"","References":"<20251028084650.13043-1-benjamin.mugnier@foss.st.com>","MIME-Version":"1.0","Content-Type":"text/plain; charset=utf-8","Content-Disposition":"inline","Content-Transfer-Encoding":"8bit","In-Reply-To":"<20251028084650.13043-1-benjamin.mugnier@foss.st.com>","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":36513,"web_url":"https://patchwork.libcamera.org/comment/36513/","msgid":"<176164944589.3666756.4955893849315483248@ping.linuxembedded.co.uk>","date":"2025-10-28T11:04:05","subject":"Re: [PATCH] ipa: rpi: vd56g3: Fix frameIntegrationDiff value","submitter":{"id":4,"url":"https://patchwork.libcamera.org/api/people/4/","name":"Kieran Bingham","email":"kieran.bingham@ideasonboard.com"},"content":"Quoting Benjamin Mugnier (2025-10-28 08:46:50)\n> In the vd56g3 user manual :\n> \n> MAX_EXPOSURE_COARSE = FRAME_LENGTH − EXP_COARSE_INTG_MARGIN − 7\n> EXP_COARSE_INTG_MARGIN >= 68\n> \n> Therefore, frameIntegrationDiff is EXP_COARSE_INTG_MARGIN + 7, equals\n> 75. This value is coherent with the VD56G3_EXPOSURE_MARGIN in the kernel\n> driver source code.\n> \n> Reported-by: Jacopo Mondi \n> Signed-off-by: Benjamin Mugnier \n\nReviewed-by: Kieran Bingham \n\n> ---\n> src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp | 2 +-\n> 1 file changed, 1 insertion(+), 1 deletion(-)\n> \n> diff --git a/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp b/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n> index 140aabd802ad..8a58bc746711 100644\n> --- a/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n> +++ b/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n> @@ -23,7 +23,7 @@ private:\n> * Smallest difference between the frame length and integration time,\n> * in units of lines.\n> */\n> - static constexpr int frameIntegrationDiff = 61;\n> + static constexpr int frameIntegrationDiff = 75;\n> };\n> \n> CamHelperVd56g3::CamHelperVd56g3()\n> -- \n> 2.25.1\n>","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 3B6ACBE080\n\tfor ;\n\tTue, 28 Oct 2025 11:04:11 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 0070A607A7;\n\tTue, 28 Oct 2025 12:04:09 +0100 (CET)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id CD5F7606DE\n\tfor ;\n\tTue, 28 Oct 2025 12:04:08 +0100 (CET)","from pendragon.ideasonboard.com\n\t(cpc89244-aztw30-2-0-cust6594.18-1.cable.virginm.net [86.31.185.195])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id F14F9AB4;\n\tTue, 28 Oct 2025 12:02:19 +0100 (CET)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"i6sTzfOi\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1761649340;\n\tbh=J+IA2a5vsDA7HwGD+bhV6n86b4JIobyo19st5jy22CI=;\n\th=In-Reply-To:References:Subject:From:Cc:To:Date:From;\n\tb=i6sTzfOiBfJkSQoJCfBIqS6Zczj15kD/B5SgF7IEwfxjMobsAULKHeQWjxZidXu/q\n\tQ5VkA0cI04ZyT7Nd9lC3Om+3ApYvws2YSUI15t+oMwIgbK3L2TDohBaNgujZiv+88C\n\tWf5k3Zjx2wJ2SrWzfhKFBkgJAhmEEzfuB50eijg0=","Content-Type":"text/plain; charset=\"utf-8\"","MIME-Version":"1.0","Content-Transfer-Encoding":"quoted-printable","In-Reply-To":"<20251028084650.13043-1-benjamin.mugnier@foss.st.com>","References":"<20251028084650.13043-1-benjamin.mugnier@foss.st.com>","Subject":"Re: [PATCH] ipa: rpi: vd56g3: Fix frameIntegrationDiff value","From":"Kieran Bingham ","Cc":"Benjamin Mugnier ,\n\tJacopo Mondi ","To":"Benjamin Mugnier ,\n\tlibcamera-devel@lists.libcamera.org","Date":"Tue, 28 Oct 2025 11:04:05 +0000","Message-ID":"<176164944589.3666756.4955893849315483248@ping.linuxembedded.co.uk>","User-Agent":"alot/0.9.1","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":36518,"web_url":"https://patchwork.libcamera.org/comment/36518/","msgid":"","date":"2025-10-28T15:03:19","subject":"Re: [PATCH] ipa: rpi: vd56g3: Fix frameIntegrationDiff value","submitter":{"id":34,"url":"https://patchwork.libcamera.org/api/people/34/","name":"Naushir Patuck","email":"naush@raspberrypi.com"},"content":"Hi Benjamin,\n\nOn Tue, 28 Oct 2025 at 08:47, Benjamin Mugnier\n wrote:\n>\n> In the vd56g3 user manual :\n>\n> MAX_EXPOSURE_COARSE = FRAME_LENGTH − EXP_COARSE_INTG_MARGIN − 7\n> EXP_COARSE_INTG_MARGIN >= 68\n>\n> Therefore, frameIntegrationDiff is EXP_COARSE_INTG_MARGIN + 7, equals\n> 75. This value is coherent with the VD56G3_EXPOSURE_MARGIN in the kernel\n> driver source code.\n>\n> Reported-by: Jacopo Mondi \n> Signed-off-by: Benjamin Mugnier \n\nI'm a bit confused why the datasheet would not fold the 7 lines into\nEXP_COARSE_INTG_MARGIN?\nBut since these numbers are correct according to the datasheet,\n\nReviewed-by: Naushir Patuck \n\n> ---\n> src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp | 2 +-\n> 1 file changed, 1 insertion(+), 1 deletion(-)\n>\n> diff --git a/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp b/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n> index 140aabd802ad..8a58bc746711 100644\n> --- a/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n> +++ b/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n> @@ -23,7 +23,7 @@ private:\n> * Smallest difference between the frame length and integration time,\n> * in units of lines.\n> */\n> - static constexpr int frameIntegrationDiff = 61;\n> + static constexpr int frameIntegrationDiff = 75;\n> };\n>\n> CamHelperVd56g3::CamHelperVd56g3()\n> --\n> 2.25.1\n>","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 CC041BE080\n\tfor ;\n\tTue, 28 Oct 2025 15:04:01 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id CF4CF607D9;\n\tTue, 28 Oct 2025 16:04:00 +0100 (CET)","from mail-vs1-xe2c.google.com (mail-vs1-xe2c.google.com\n\t[IPv6:2607:f8b0:4864:20::e2c])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id DE517606DE\n\tfor ;\n\tTue, 28 Oct 2025 16:03:57 +0100 (CET)","by mail-vs1-xe2c.google.com with SMTP id\n\tada2fe7eead31-5db21dc0a3dso321646137.2\n\tfor ;\n\tTue, 28 Oct 2025 08:03:57 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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Tue, 28 Oct 2025\n\t08:03:55 -0700 (PDT)","MIME-Version":"1.0","References":"<20251028084650.13043-1-benjamin.mugnier@foss.st.com>","In-Reply-To":"<20251028084650.13043-1-benjamin.mugnier@foss.st.com>","From":"Naushir Patuck ","Date":"Tue, 28 Oct 2025 15:03:19 +0000","X-Gm-Features":"AWmQ_bnVd19PWYihXUiLXYM8UhCivrLWjAf4uHis29Sh4azXfACVppkj1Qt_lmU","Message-ID":"","Subject":"Re: [PATCH] ipa: rpi: vd56g3: Fix frameIntegrationDiff value","To":"Benjamin Mugnier ","Cc":"libcamera-devel@lists.libcamera.org, \n\tJacopo Mondi ","Content-Type":"text/plain; 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\" "}},{"id":36519,"web_url":"https://patchwork.libcamera.org/comment/36519/","msgid":"","date":"2025-10-28T15:23:31","subject":"Re: [PATCH] ipa: rpi: vd56g3: Fix frameIntegrationDiff value","submitter":{"id":227,"url":"https://patchwork.libcamera.org/api/people/227/","name":"Benjamin Mugnier","email":"benjamin.mugnier@foss.st.com"},"content":"Hi Naush,\n\nOn 10/28/25 16:03, Naushir Patuck wrote:\n> Hi Benjamin,\n> \n> On Tue, 28 Oct 2025 at 08:47, Benjamin Mugnier\n> wrote:\n>>\n>> In the vd56g3 user manual :\n>>\n>> MAX_EXPOSURE_COARSE = FRAME_LENGTH − EXP_COARSE_INTG_MARGIN − 7\n>> EXP_COARSE_INTG_MARGIN >= 68\n>>\n>> Therefore, frameIntegrationDiff is EXP_COARSE_INTG_MARGIN + 7, equals\n>> 75. This value is coherent with the VD56G3_EXPOSURE_MARGIN in the kernel\n>> driver source code.\n>>\n>> Reported-by: Jacopo Mondi \n>> Signed-off-by: Benjamin Mugnier \n> \n> I'm a bit confused why the datasheet would not fold the 7 lines into\n> EXP_COARSE_INTG_MARGIN?\n> But since these numbers are correct according to the datasheet,\n\nI had the same surprise. Documentation writers choose not to merge the 7\ninto EXP_COARSE_INTG_MARGIN because in the firmware the sensor is\neffectively stopped for 7 lines, which differs from the integration time\nper se.\n\nHaving the 7 defined behind a constant may help the reading\n MAX_EXPOSURE_COARSE = FRAME_LENGTH − EXP_COARSE_INTG_MARGIN −\nSENSOR_STOP_LINES\n\nWith SENSOR_STOP_LINES = 7. But we're talking about very specific stuff.\n\n> Reviewed-by: Naushir Patuck \n> \n>> ---\n>> src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp | 2 +-\n>> 1 file changed, 1 insertion(+), 1 deletion(-)\n>>\n>> diff --git a/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp b/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n>> index 140aabd802ad..8a58bc746711 100644\n>> --- a/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n>> +++ b/src/ipa/rpi/cam_helper/cam_helper_vd56g3.cpp\n>> @@ -23,7 +23,7 @@ private:\n>> * Smallest difference between the frame length and integration time,\n>> * in units of lines.\n>> */\n>> - static constexpr int frameIntegrationDiff = 61;\n>> + static constexpr int frameIntegrationDiff = 75;\n>> };\n>>\n>> CamHelperVd56g3::CamHelperVd56g3()\n>> --\n>> 2.25.1\n>>","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 102BDC3259\n\tfor ;\n\tTue, 28 Oct 2025 15:23:39 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 505F4607DB;\n\tTue, 28 Oct 2025 16:23:38 +0100 (CET)","from mx07-00178001.pphosted.com (mx07-00178001.pphosted.com\n\t[185.132.182.106])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 6FFF7606DE\n\tfor ;\n\tTue, 28 Oct 2025 16:23:36 +0100 (CET)","from pps.filterd (m0241204.ppops.net [127.0.0.1])\n\tby mx07-00178001.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id\n\t59SF0Xd1488479; 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