From patchwork Fri Mar 8 08:33:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Umang Jain X-Patchwork-Id: 13586539 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1916853800; Fri, 8 Mar 2024 08:33:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709886825; cv=none; b=P1B38kmGtFQ73gfDC7dhA1qMi6DxyQN7SRWpWBdjT3iidHKPmYHBzcVc+Cr62eHUX4jcoB5Ukx6KDMLQVfLP58qGcG+yxux8wtafhFel6Rc5S0QAytNcqcbbc8Z7P+K7BQTtmM+KDRd0zndvDi4bxVtdSAR6LKAK4V/FHBK1lIE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709886825; c=relaxed/simple; bh=ni0zzgNmwlIEIQxrz1XQ71WVVNBDG7QXaditpxgnp4g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YwZGhBAL7sjLjvpp2BFu/gXw5JJ+fDhdGp/0fObRMSEXJA1JgWVWXlJyzwUcgN3PrnoNzuFUwbxWCteLkKcxoVUeriVARZOKijkZmRCCFHp3SOKNE53d35Eu46J2ZMaLhw6RO5e3twzjDjlmMPPPcttqGvk6LdThf38EZ/E3SHE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=m8btjd4/; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="m8btjd4/" Received: from umang.jain (unknown [103.251.226.70]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id BDAA5BEB; Fri, 8 Mar 2024 09:33:20 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1709886803; bh=ni0zzgNmwlIEIQxrz1XQ71WVVNBDG7QXaditpxgnp4g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m8btjd4/qSKK35Yh1FD098XRnxHUav1iHKTnY6yTwBLz0LiUlkzNbrVDRmgr0vag1 XOorkalzjxStJ953FCLdERuwNGH8Ue70fHYV1A/4ulcMadiZJ3D/yH4mehzuzVzsdU MY4lmNfBtovCxovS9GhZAxiQrcFp1Vt6hDbg/dqw= From: Umang Jain To: linux-media@vger.kernel.org Cc: Alexander Shiyan , Kieran Bingham , Sakari Ailus , open list , Dave Stevenson , Umang Jain Subject: [PATCH v2 6/6] media: imx335: Limit analogue gain value Date: Fri, 8 Mar 2024 14:03:12 +0530 Message-ID: <20240308083312.90279-7-umang.jain@ideasonboard.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240308083312.90279-1-umang.jain@ideasonboard.com> References: <20240308083312.90279-1-umang.jain@ideasonboard.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The sensor gain (both analog and digital) are controlled by a single gain value where: - 0dB to 30dB correspond to analog gain - 30.3dB to 72dB correspond to digital gain (with 0.3dB step) Hence, limit the analogue gain value to 100. For digital gain, support can be added later if needed. Signed-off-by: Umang Jain Reviewed-by: Kieran Bingham Reviewed-by: Tommaso Merciai --- drivers/media/i2c/imx335.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/media/i2c/imx335.c b/drivers/media/i2c/imx335.c index 85cb53e3d5d4..cc59f446cd09 100644 --- a/drivers/media/i2c/imx335.c +++ b/drivers/media/i2c/imx335.c @@ -53,7 +53,7 @@ /* Analog gain control */ #define IMX335_REG_AGAIN CCI_REG8(0x30e8) #define IMX335_AGAIN_MIN 0 -#define IMX335_AGAIN_MAX 240 +#define IMX335_AGAIN_MAX 100 #define IMX335_AGAIN_STEP 1 #define IMX335_AGAIN_DEFAULT 0 @@ -1174,6 +1174,14 @@ static int imx335_init_controls(struct imx335 *imx335) IMX335_EXPOSURE_STEP, IMX335_EXPOSURE_DEFAULT); + /* + * The sensor has an analog gain and a digital gain, both controlled + * through a single gain value, expressed in 0.3dB increments. Values + * from 0.0dB (0) to 30.0dB (100) apply analog gain only, higher values + * up to 72.0dB (240) add further digital gain. Limit the range to + * analog gain only, support for digital gain can be added separately + * if needed. + */ imx335->again_ctrl = v4l2_ctrl_new_std(ctrl_hdlr, &imx335_ctrl_ops, V4L2_CID_ANALOGUE_GAIN,