From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 5F20232E73E; Tue, 4 Nov 2025 14:31:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762266670; cv=none; b=h+6Z84f8b+gsGFgGw7E8qHGmGKpallqxRZIo+lzqMhcubYgJo8pd9QJT0Bi4l90NQBBCBXynqyds+h2hsBxXyxU3m/ZXutYlUfwnLzfwRRXCAqbqjYp3/i2n2IdxjjA4riFeAv4XD8kSU3Jqao8pbCuyWhGzEUK817D+XyqNnH0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762266670; c=relaxed/simple; bh=m+ILLZqDdrgoDSCjpAkn2Jfpr2nfySLB45UiCiBZVTs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=WRrxwjz3Ai2LS2YN8GdTUi8WKJDtUS2RvgWvzleUmTr07mn4zALBYI23rmAJLREHpT62L6oJUJMtS6iEobLoRKn88kI+SDl2LAXKwbHgXjgLT+pXDTzGobZYHy5lWCIWPj3HXDa6HqG3dcUsX0thP8Ut8XGRrRo1d4G5Vh0TFpk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=TR2OutxD; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="TR2OutxD" Received: by smtp.kernel.org (Postfix) with ESMTPS id 1AE8AC16AAE; Tue, 4 Nov 2025 14:31:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux.dev; s=korg; t=1762266670; bh=m+ILLZqDdrgoDSCjpAkn2Jfpr2nfySLB45UiCiBZVTs=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=TR2OutxDZTcsgb6is9KBjOpOe7RzfzWuKm3ESbisz3Mq08P0QLngXzJgx0GXyoMVF sNfY5td5HzQxn2jR2uvPIca08N3lJ4AJCHzo2EUoDVryDu/58o2zBIeLie7x14rTO6 v8iFDrMhUPfZKT+z0OGwFFsHY9Aa1vzajjplFV5o= Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 14ED7CCFA0D; Tue, 4 Nov 2025 14:31:10 +0000 (UTC) From: Richard Leitner Date: Tue, 04 Nov 2025 15:30:59 +0100 Subject: [PATCH v8 8/8] media: i2c: ov9282: dynamic flash_duration maximum Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20251104-ov9282-flash-strobe-v8-8-b91dfef1c65a@linux.dev> References: <20251104-ov9282-flash-strobe-v8-0-b91dfef1c65a@linux.dev> In-Reply-To: <20251104-ov9282-flash-strobe-v8-0-b91dfef1c65a@linux.dev> To: Sakari Ailus , Dave Stevenson , Mauro Carvalho Chehab , Lee Jones , Pavel Machek , Laurent Pinchart Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-leds@vger.kernel.org, Richard Leitner , Hans Verkuil X-Mailer: b4 0.15-dev-509f5 X-Developer-Signature: v=1; a=ed25519-sha256; t=1762266668; l=3530; i=richard.leitner@linux.dev; s=20250225; h=from:subject:message-id; bh=m+ILLZqDdrgoDSCjpAkn2Jfpr2nfySLB45UiCiBZVTs=; b=bz35NYgvXCLxLYYilEeqnsmM6a1+Wkr9uPlsazdEs/NUQUpkNqeoogHmTsWEu8y4lb4fZgac1 btUMBDJ5+0PDaaaNPevR0MlwayAWyVi/h8RiRR+wIgvjebrv17yo9RF X-Developer-Key: i=richard.leitner@linux.dev; a=ed25519; pk=8hZNyyyQFqZ5ruVJsSGBSPIrmJpfDm5HwHU4QVOP1Pk= X-Endpoint-Received: by B4 Relay for richard.leitner@linux.dev/20250225 with auth_id=350 This patch sets the current exposure time as maximum for the flash_duration control. As Flash/Strobes which are longer than the exposure time have no effect. Signed-off-by: Richard Leitner --- drivers/media/i2c/ov9282.c | 30 ++++++++++++++++++++++++++---- 1 file changed, 26 insertions(+), 4 deletions(-) diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c index 7aa74feb3ee44..df7beedba0b9e 100644 --- a/drivers/media/i2c/ov9282.c +++ b/drivers/media/i2c/ov9282.c @@ -198,6 +198,7 @@ struct ov9282_mode { * @exp_ctrl: Pointer to exposure control * @again_ctrl: Pointer to analog gain control * @pixel_rate: Pointer to pixel rate control + * @flash_duration: Pointer to flash duration control * @vblank: Vertical blanking in lines * @noncontinuous_clock: Selection of CSI2 noncontinuous clock mode * @cur_mode: Pointer to current selected sensor mode @@ -220,6 +221,7 @@ struct ov9282 { struct v4l2_ctrl *again_ctrl; }; struct v4l2_ctrl *pixel_rate; + struct v4l2_ctrl *flash_duration; u32 vblank; bool noncontinuous_clock; const struct ov9282_mode *cur_mode; @@ -611,6 +613,15 @@ static int ov9282_update_controls(struct ov9282 *ov9282, mode->vblank_max, 1, mode->vblank); } +static u32 ov9282_exposure_to_us(struct ov9282 *ov9282, u32 exposure) +{ + /* calculate exposure time in µs */ + u32 frame_width = ov9282->cur_mode->width + ov9282->hblank_ctrl->val; + u32 trow_us = frame_width * 1000000UL / ov9282->pixel_rate->val; + + return exposure * trow_us; +} + /** * ov9282_update_exp_gain() - Set updated exposure and gain * @ov9282: pointer to ov9282 device @@ -622,9 +633,10 @@ static int ov9282_update_controls(struct ov9282 *ov9282, static int ov9282_update_exp_gain(struct ov9282 *ov9282, u32 exposure, u32 gain) { int ret; + u32 exposure_us = ov9282_exposure_to_us(ov9282, exposure); - dev_dbg(ov9282->dev, "Set exp %u, analog gain %u", - exposure, gain); + dev_dbg(ov9282->dev, "Set exp %u (~%u us), analog gain %u", + exposure, exposure_us, gain); ret = ov9282_write_reg(ov9282, OV9282_REG_HOLD, 1, 1); if (ret) @@ -635,6 +647,12 @@ static int ov9282_update_exp_gain(struct ov9282 *ov9282, u32 exposure, u32 gain) goto error_release_group_hold; ret = ov9282_write_reg(ov9282, OV9282_REG_AGAIN, 1, gain); + if (ret) + goto error_release_group_hold; + + ret = __v4l2_ctrl_modify_range(ov9282->flash_duration, + 0, exposure_us, 1, + OV9282_STROBE_FRAME_SPAN_DEFAULT); error_release_group_hold: ov9282_write_reg(ov9282, OV9282_REG_HOLD, 1, 0); @@ -1423,6 +1441,7 @@ static int ov9282_init_controls(struct ov9282 *ov9282) const struct ov9282_mode *mode = ov9282->cur_mode; struct v4l2_fwnode_device_properties props; u32 hblank_min; + u32 exposure_us; u32 lpfr; int ret; @@ -1495,8 +1514,11 @@ static int ov9282_init_controls(struct ov9282 *ov9282) v4l2_ctrl_new_std(ctrl_hdlr, &ov9282_ctrl_ops, V4L2_CID_FLASH_STROBE_OE, 0, 1, 1, 0); - v4l2_ctrl_new_std(ctrl_hdlr, &ov9282_ctrl_ops, V4L2_CID_FLASH_DURATION, - 0, 13900, 1, 8); + exposure_us = ov9282_exposure_to_us(ov9282, OV9282_EXPOSURE_DEFAULT); + ov9282->flash_duration = v4l2_ctrl_new_std(ctrl_hdlr, + &ov9282_ctrl_ops, V4L2_CID_FLASH_DURATION, + 0, exposure_us, + 1, OV9282_STROBE_FRAME_SPAN_DEFAULT); ret = v4l2_fwnode_device_parse(ov9282->dev, &props); if (!ret) { -- 2.47.3