From nobody Fri Oct 3 12:24:12 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 5AA8434A329; Mon, 1 Sep 2025 15:05:47 +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=1756739147; cv=none; b=MminJmCgo6Yh87XQDnWLhaeR3keQ56kcuYPx9h9ZDXmdKkp6oJqedTWEmLWXlVsvIwj62RI1sBd+6d5ex+1WaUWJIJ95aJmQgIJmDeglMZYQj1oeqkqPVFdWA/JMlKUMcaTOyVXIru8t0JXiQ1KSpeliaHUTxhKszVrUigY3Zmg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756739147; c=relaxed/simple; bh=I5haGetjk5CR5fMUuZoz3rwX2PVyWVsn8Vb9i7Affcg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=aTH7e4R/UisDqCPT5gUootB1G49OzewQE81dKCHtuNXay4nahiB/0awVfMvwA8m4myZmJ/hfZKlx4dLimMIEJxkqarXM5+HaMsfj8vAqOLlWzaIqJfHjhW73E1hZQ+j6w3aZ2uZ/YD3cOjm0AppVcRtwK08ZtK+mI5Zrrx89NVE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=YKb9wlDx; 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="YKb9wlDx" Received: by smtp.kernel.org (Postfix) with ESMTPS id 137C0C2BCB0; Mon, 1 Sep 2025 15:05:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux.dev; s=korg; t=1756739147; bh=I5haGetjk5CR5fMUuZoz3rwX2PVyWVsn8Vb9i7Affcg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=YKb9wlDxoHkemyeDNWEemnOwySymjJGElXn8tMrjgTfJfd7zab7/W87bug+d9YY4y sMcObFiB4pYEeGjvltYuQjS0vESi52sI59AN0QVgNxSGR6uLvuTw4yLXvNx3ycijX2 j1UPUVniFii06+uG3zvQqe8H1q2Kod9g/MfbAuQQ= 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 08178CA1009; Mon, 1 Sep 2025 15:05:47 +0000 (UTC) From: Richard Leitner Date: Mon, 01 Sep 2025 17:05:15 +0200 Subject: [PATCH v7 10/10] 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: <20250901-ov9282-flash-strobe-v7-10-d58d5a694afc@linux.dev> References: <20250901-ov9282-flash-strobe-v7-0-d58d5a694afc@linux.dev> In-Reply-To: <20250901-ov9282-flash-strobe-v7-0-d58d5a694afc@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 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1756739145; l=3617; i=richard.leitner@linux.dev; s=20250225; h=from:subject:message-id; bh=I5haGetjk5CR5fMUuZoz3rwX2PVyWVsn8Vb9i7Affcg=; b=89ndo5Sw4zw/nKvZB93fs7yxRCVJKeS0iI6Otle9lIxMlvzB4Rz3LpY2Aqd3yHiHOnyYVrQ0u CqGOYzBWPUMBWG+AdLax193OsQiKxpneeKn3J0jH2JyXxGI5vJtkd8H 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 b104ae77f00e9e7777342e48b7bf3caa6d297f69..3253d9f271cb3caef6d85837ebe= c4f5beb466a4d 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 *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 * 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 *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) @@ -635,6 +647,12 @@ 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_FLASH_DURATION_DEFAULT); =20 error_release_group_hold: ov9282_write_reg(ov9282, OV9282_REG_HOLD, 1, 0); @@ -1420,6 +1438,7 @@ static int ov9282_init_controls(struct ov9282 *ov9282) struct v4l2_fwnode_device_properties props; struct v4l2_ctrl *ctrl; u32 hblank_min; + u32 exposure_us; u32 lpfr; int ret; =20 @@ -1491,8 +1510,11 @@ static int ov9282_init_controls(struct ov9282 *ov928= 2) /* Flash/Strobe controls */ v4l2_ctrl_new_std(ctrl_hdlr, &ov9282_ctrl_ops, V4L2_CID_FLASH_HW_STROBE_S= IGNAL, 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_FLASH_DURATION_DEFAULT); =20 ctrl =3D v4l2_ctrl_new_std_menu(ctrl_hdlr, &ov9282_ctrl_ops, V4L2_CID_FLASH_STROBE_SOURCE, --=20 2.47.2