From patchwork Tue Apr 2 14:09:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Umang Jain X-Patchwork-Id: 13614169 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 67D5D132C19; Tue, 2 Apr 2024 14:09:53 +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=1712066995; cv=none; b=rF9QeiAAtsD2pW5tDNHee6DwTAY3IWK7j3PKx31Ihe4zNmajrqien493qGooWR7zMuUgd1NEnzMRxjLUpUR164JVmsamLuV9XcrYRYgB+luZBwAQSlZU1tcujXnXafFf5HITTYiLe/bnGrQxtAgxETM3iZ3zPS6mtEDF5sGKzuc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712066995; c=relaxed/simple; bh=l2R2+ukhGeOdEK5zvxB/TuakwAbZuTzRFW/X96M+/RM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Q4Cdh3ajQTCji5dbSNbB4DeiYKdavZdKjo6h3x339jgJzqTlSTRFi/tsARvvMW1u0oWeVzMDuT4nr3e8Dq6suJHXKR2qS4F/nCtyf2w1/VoI5IRPS6Gz3y4CF+mtDf6964FlAvr6wLhhH9oqYEKbxOPF9AMTbbNf8oaNVXw0eck= 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=CKjMS+lz; 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="CKjMS+lz" Received: from umang.jain (unknown [103.86.18.232]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 238C266F; Tue, 2 Apr 2024 16:09:12 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1712066955; bh=l2R2+ukhGeOdEK5zvxB/TuakwAbZuTzRFW/X96M+/RM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CKjMS+lz+fDspYkMfyRDBZ+4nFEidcAp8zasjQ/IB5cgjdlUYHPFVm1c05bAc91o3 RsJ7uWSGTOPB7S2deXS6/uSHMFEnzlpCDXJX2S/LyN2s2i/Gx+mqVH9WTRJRx7aNJ8 GgZO/0Zhfl70FO7Zcz7/vQbuhJhk/BU79tb1602U= From: Umang Jain To: linux-media@vger.kernel.org Cc: Alexander Shiyan , Kieran Bingham , Sakari Ailus , open list , Dave Stevenson , Umang Jain , Tommaso Merciai Subject: [PATCH v4 6/6] media: imx335: Limit analogue gain value Date: Tue, 2 Apr 2024 19:39:24 +0530 Message-ID: <20240402140924.10009-7-umang.jain@ideasonboard.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240402140924.10009-1-umang.jain@ideasonboard.com> References: <20240402140924.10009-1-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 dfc24783dc34..aed3efa9f590 100644 --- a/drivers/media/i2c/imx335.c +++ b/drivers/media/i2c/imx335.c @@ -52,7 +52,7 @@ /* 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 @@ -1175,6 +1175,14 @@ 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,