From nobody Thu Dec 18 10:14:59 2025 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 4D4022EF677; Tue, 9 Dec 2025 22:44:52 +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=1765320292; cv=none; b=qOTtysBGld4uJZzvn4IyT0CSYoOVwUCF1uUWgKxHn58srJkj8IGYo1hu9qxxAysBaRrTVixNV9BdAsx6xgW4rfUlj/IKcMwFAEf4/RGaGUFauDsKxIWwwbyZFdSakh3B2Tqe7u/BwYEqmW+BnNKtu+s5W4dU5yuTNwX1KCNhAxw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765320292; c=relaxed/simple; bh=UuMoLuJfdLps8yqouK7Hr1rJGUdmAkEs+vLHfq0hc7Y=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Yvztt+m4nYfIlKoBaBs8c+41t8vZWOH9T9HnTIee8FyPMDXzoJXFM7+8ckQABzXv0wt0jZN8FoMKuUmZslb3hWkQE+GfcJ8cCeG/qOnZNVn+SeKC9YITEd4/7mXTNtZ6BAApt8uMJFL+ehXKoxdjUFxFMPtxGiRBoJI029Hoo6s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=K9HqtCqm; 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="K9HqtCqm" Received: by smtp.kernel.org (Postfix) with ESMTPS id 26F18C2BCAF; Tue, 9 Dec 2025 22:44:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux.dev; s=korg; t=1765320292; bh=UuMoLuJfdLps8yqouK7Hr1rJGUdmAkEs+vLHfq0hc7Y=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=K9HqtCqmmVkEds6XoIFBbFm9xPEfet3QnXguGVkC88mtAATSSHFUie5KDUkuMQUsl MBq9EySvK9USS0KYFAsXhow0ZAQaMVgb2NjbChhQHKNSMmeb5w8zO46ZfIsjAeX0QM VxreOAoHn5k4zZe7VDretrdShNQEYxA1JTVR4rOY= 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 1D7A2D3B982; Tue, 9 Dec 2025 22:44:52 +0000 (UTC) From: Richard Leitner Date: Tue, 09 Dec 2025 23:44:43 +0100 Subject: [PATCH v10 8/8] media: i2c: ov9282: dynamic flash_duration maximum Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251209-ov9282-flash-strobe-v10-8-0117cab82e2d@linux.dev> References: <20251209-ov9282-flash-strobe-v10-0-0117cab82e2d@linux.dev> In-Reply-To: <20251209-ov9282-flash-strobe-v10-0-0117cab82e2d@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-a3fc8 X-Developer-Signature: v=1; a=ed25519-sha256; t=1765320290; l=3532; i=richard.leitner@linux.dev; s=20250225; h=from:subject:message-id; bh=UuMoLuJfdLps8yqouK7Hr1rJGUdmAkEs+vLHfq0hc7Y=; b=xkRjGS9K8gG09Vv6NDV9eTBhCgVNEu1GVB3fW3OZ4aSA2rm6J2QmAng/3oYCICBHLlkbGZYUY OCpmNKcZg+ZCXLN+0A9TmxN6U3sdECEgFKmYqBppFkrtrg6SB//EBRd 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 4c25b3e11afc0..cb8f6696d2783 100644 --- a/drivers/media/i2c/ov9282.c +++ b/drivers/media/i2c/ov9282.c @@ -199,6 +199,7 @@ 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 @@ -221,6 +222,7 @@ 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; @@ -612,6 +614,15 @@ static int ov9282_update_controls(struct ov9282 *ov928= 2, mode->vblank_max, 1, mode->vblank); } =20 +static u32 ov9282_exposure_to_us(struct ov9282 *ov9282, u32 exposure) +{ + /* calculate exposure time in =C2=B5s */ + u32 frame_width =3D ov9282->cur_mode->width + ov9282->hblank_ctrl->val; + u32 trow_us =3D frame_width / (ov9282->pixel_rate->val / 1000000UL); + + return exposure * trow_us; +} + /** * ov9282_update_exp_gain() - Set updated exposure and gain * @ov9282: pointer to ov9282 device @@ -623,9 +634,10 @@ static int ov9282_update_controls(struct ov9282 *ov928= 2, static int ov9282_update_exp_gain(struct ov9282 *ov9282, u32 exposure, u32= gain) { int ret; + u32 exposure_us =3D ov9282_exposure_to_us(ov9282, exposure); =20 - 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); =20 ret =3D ov9282_write_reg(ov9282, OV9282_REG_HOLD, 1, 1); if (ret) @@ -636,6 +648,12 @@ static int ov9282_update_exp_gain(struct ov9282 *ov928= 2, u32 exposure, u32 gain) goto error_release_group_hold; =20 ret =3D ov9282_write_reg(ov9282, OV9282_REG_AGAIN, 1, gain); + if (ret) + goto error_release_group_hold; + + ret =3D __v4l2_ctrl_modify_range(ov9282->flash_duration, + 0, exposure_us, 1, + OV9282_STROBE_FRAME_SPAN_DEFAULT); =20 error_release_group_hold: ov9282_write_reg(ov9282, OV9282_REG_HOLD, 1, 0); @@ -1432,6 +1450,7 @@ static int ov9282_init_controls(struct ov9282 *ov9282) const struct ov9282_mode *mode =3D ov9282->cur_mode; struct v4l2_fwnode_device_properties props; u32 hblank_min; + u32 exposure_us; u32 lpfr; int ret; =20 @@ -1504,8 +1523,11 @@ static int ov9282_init_controls(struct ov9282 *ov928= 2) v4l2_ctrl_new_std(ctrl_hdlr, &ov9282_ctrl_ops, V4L2_CID_FLASH_STROBE_OE, 0, 1, 1, 0); =20 - v4l2_ctrl_new_std(ctrl_hdlr, &ov9282_ctrl_ops, V4L2_CID_FLASH_DURATION, - 0, 13900, 1, 8); + exposure_us =3D ov9282_exposure_to_us(ov9282, OV9282_EXPOSURE_DEFAULT); + ov9282->flash_duration =3D v4l2_ctrl_new_std(ctrl_hdlr, + &ov9282_ctrl_ops, V4L2_CID_FLASH_DURATION, + 0, exposure_us, + 1, OV9282_STROBE_FRAME_SPAN_DEFAULT); =20 ret =3D v4l2_fwnode_device_parse(ov9282->dev, &props); if (!ret) { --=20 2.47.3