From: Jacopo Mondi <jacopo@jmondi.org>
To: Eugen Hristev <eugen.hristev@microchip.com>
Cc: linux-media@vger.kernel.org, robh+dt@kernel.org,
laurent.pinchart@ideasonboard.com, sakari.ailus@iki.fi,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
nicolas.ferre@microchip.com
Subject: Re: [PATCH v3 19/23] media: atmel: atmel-isc-base: clamp wb gain coefficients
Date: Wed, 12 Jan 2022 10:04:05 +0100 [thread overview]
Message-ID: <20220112090405.tjgz47dhdbyjrwxr@uno.localdomain> (raw)
In-Reply-To: <20211213134940.324266-20-eugen.hristev@microchip.com>
Hi Eugen
On Mon, Dec 13, 2021 at 03:49:36PM +0200, Eugen Hristev wrote:
> White balance computed gains can overflow above the 13 bits hardware
> coefficient that can be used, in some specific scenarios like a subexposure
> from the sensor when the image is mostly black.
> In this case the computed gain has to be clamped to the maximum value
> allowed by the hardware.
>
> Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
> ---
> drivers/media/platform/atmel/atmel-isc-base.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
> index f1f1019f9d82..31c8e3029eee 100644
> --- a/drivers/media/platform/atmel/atmel-isc-base.c
> +++ b/drivers/media/platform/atmel/atmel-isc-base.c
> @@ -1415,6 +1415,10 @@ static void isc_wb_update(struct isc_ctrls *ctrls)
> /* multiply both gains and adjust for decimals */
> ctrls->gain[c] = s_gain[c] * gw_gain[c];
> ctrls->gain[c] >>= 9;
> +
> + /* make sure we are not out of range */
> + ctrls->gain[c] = clamp_val(ctrls->gain[c], 0, GENMASK(12, 0));
#include <linux/minmax.h>
What is the type of gain[c} ? If it's unsigned clamping with [0 is not
required. I would in that case gain[c] = min(gain[c], ...)
It's fine anyway
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Thanks
j
> +
> v4l2_dbg(1, debug, &isc->v4l2_dev,
> "isc wb: component %d, final gain %u\n",
> c, ctrls->gain[c]);
> --
> 2.25.1
>
next prev parent reply other threads:[~2022-01-12 9:03 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-13 13:49 [PATCH v3 00/23] media: atmel: atmel-isc: implement media controller Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 01/23] MAINTAINERS: add microchip csi2dc Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 02/23] dt-bindings: media: atmel: csi2dc: add bindings for " Eugen Hristev
2021-12-15 20:16 ` Rob Herring
2021-12-13 13:49 ` [PATCH v3 03/23] media: atmel: introduce microchip csi2dc driver Eugen Hristev
2022-01-11 15:43 ` Jacopo Mondi
2021-12-13 13:49 ` [PATCH v3 04/23] media: atmel: atmel-isc: split the clock code into separate source file Eugen Hristev
2022-01-11 15:43 ` Jacopo Mondi
2021-12-13 13:49 ` [PATCH v3 05/23] media: atmel: atmel-isc: replace video device name with module name Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 06/23] media: atmel: atmel-sama7g5-isc: fix ispck leftover Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 07/23] media: atmel: atmel-isc-base: use streaming status when queueing buffers Eugen Hristev
2022-01-11 15:53 ` Hans Verkuil
2022-01-11 16:38 ` Eugen.Hristev
2022-01-12 9:52 ` Hans Verkuil
2021-12-13 13:49 ` [PATCH v3 08/23] media: atmel: atmel-isc-base: remove frameintervals VIDIOC Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 09/23] media: atmel: atmel-isc-base: report frame sizes as full supported range Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 10/23] media: atmel: atmel-isc-base: implement mbus_code support in enumfmt Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 11/23] media: atmel: atmel-isc-base: fix bytesperline value for planar formats Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 12/23] media: atmel: atmel-isc: implement media controller Eugen Hristev
2022-01-11 16:06 ` Jacopo Mondi
2022-01-11 16:30 ` Eugen.Hristev
2022-01-11 16:51 ` Jacopo Mondi
2022-01-11 17:00 ` Eugen.Hristev
2021-12-13 13:49 ` [PATCH v3 13/23] ARM: dts: at91: sama7g5: add nodes for video capture Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 14/23] ARM: configs: at91: sama7: add xisc and csi2dc Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 15/23] ARM: multi_v7_defconfig: add atmel video pipeline modules Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 16/23] media: atmel: atmel-sama5d2-isc: fix wrong mask in YUYV format check Eugen Hristev
2021-12-13 13:49 ` [PATCH v3 17/23] media: atmel: atmel-isc-base: use mutex to lock awb workqueue from streaming Eugen Hristev
2022-01-12 8:58 ` Jacopo Mondi
2022-01-19 15:40 ` Eugen.Hristev
2021-12-13 13:49 ` [PATCH v3 18/23] media: atmel: atmel-isc-base: add wb debug messages Eugen Hristev
2022-01-12 9:00 ` Jacopo Mondi
2021-12-13 13:49 ` [PATCH v3 19/23] media: atmel: atmel-isc-base: clamp wb gain coefficients Eugen Hristev
2022-01-12 9:04 ` Jacopo Mondi [this message]
2021-12-13 13:49 ` [PATCH v3 20/23] media: atmel: atmel-sama7g5-isc: fix UYVY input format mbus_code typo Eugen Hristev
2022-01-12 9:04 ` Jacopo Mondi
2021-12-13 13:49 ` [PATCH v3 21/23] media: atmel: atmel-isc: add raw Bayer 8bit 10bit output formats Eugen Hristev
2022-01-12 9:05 ` Jacopo Mondi
2021-12-13 13:49 ` [PATCH v3 22/23] media: atmel: atmel-isc: compact the controller formats list Eugen Hristev
2022-01-12 9:06 ` Jacopo Mondi
2021-12-13 13:49 ` [PATCH v3 23/23] media: atmel: atmel-isc: change format propagation to subdev into only verification Eugen Hristev
2022-01-12 9:21 ` Jacopo Mondi
2022-01-20 8:43 ` Eugen.Hristev
2022-01-20 8:48 ` Eugen.Hristev
2022-01-20 8:58 ` Jacopo Mondi
2022-01-12 12:07 ` [PATCH v3 00/23] media: atmel: atmel-isc: implement media controller Hans Verkuil
2022-01-12 12:46 ` Eugen.Hristev
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