From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4F845CAC5B0 for ; Sun, 5 Oct 2025 00:25:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Fvn4CHSraloNg0d77ItQy+gRuXQjVxFxzAVd5hx04PQ=; b=eIo7cexT+Y7VjLx4mkYMV77KPp 9aWhNPb4Lx3lbnx6OUQYKBb6mxGUoShZp0T3tfa8XllX4oAkjF8RL3OHNLy8hl96hq5cnJRjzAv4q flMULGqcBWE8lcniBd3TGga06CMcaZ0sjOpKLs9JKrlmvR6PTp82P0q/lw+qyhaNuniPGsDGcTsq0 gNYAASrN31EDm1BDTLUbicKPl7ucQO1XhxKjhbf9zLlg+NRMB7lPp8z15bwXcS6d7RI5Y2ksdo6Hv PAjMiBhODJzwbWxPMX+tXocIVBEwfFMIe5yP25GuWVS9iQhYrpuK3ApOGdXm+F+EPBe1awCuRWHBQ xOVKDe9Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v5CYj-0000000E8gu-0ZyF; Sun, 05 Oct 2025 00:25:05 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1v5CYf-0000000E8gQ-3ydC; Sun, 05 Oct 2025 00:25:03 +0000 Received: from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi [81.175.209.231]) by perceval.ideasonboard.com (Postfix) with UTF8SMTPSA id 9808BC6E; Sun, 5 Oct 2025 02:23:28 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1759623808; bh=gQv8rVt3G5Sp/h+9pCG5bWX/kK8RHwN2ZheTAD4EXIk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=l2peJZjuAyJ81txRk4qoY/Ur0O6bFvvsDsyhwMyer/VKPa5qPb8elcdgidPiibbcX yIqG3zibNUlNupGh5IBzWNANJUxVkcsZmGoQjnn6bruWJpEAry30K2tuUtTNLfKBW/ MS99wot2Qevcz3QM/7zLiwV6b2wjw4JBjrzp+hi4= Date: Sun, 5 Oct 2025 03:24:53 +0300 From: Laurent Pinchart To: Jacopo Mondi Cc: Dafna Hirschfeld , Keke Li , Mauro Carvalho Chehab , Heiko Stuebner , Dan Scally , Sakari Ailus , Antoine Bouyer , linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v5 3/8] media: uapi: Convert Amlogic C3 to V4L2 extensible params Message-ID: <20251005002453.GC13055@pendragon.ideasonboard.com> References: <20250915-extensible-parameters-validation-v5-0-e6db94468af3@ideasonboard.com> <20250915-extensible-parameters-validation-v5-3-e6db94468af3@ideasonboard.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20250915-extensible-parameters-validation-v5-3-e6db94468af3@ideasonboard.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251004_172502_135774_A83B8E7C X-CRM114-Status: GOOD ( 40.31 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Jacopo, Thank you for the patch. On Mon, Sep 15, 2025 at 07:18:12PM +0200, Jacopo Mondi wrote: > With the introduction of common types for extensible parameters > format, convert the c3-isp-config.h header to use the new types. > > Factor-out the documentation that is now part of the common header > and only keep the driver-specific on in place. > > The conversion to use common types doesn't impact userspace as the > new types are either identical to the ones already existing in the > C3 ISP uAPI or are 1-to-1 type convertible. You can reflow the commit message. > Reviewed-by: Daniel Scally > Reviewed-by: Keke Li > Signed-off-by: Jacopo Mondi > --- > include/uapi/linux/media/amlogic/c3-isp-config.h | 86 ++++++------------------ > 1 file changed, 20 insertions(+), 66 deletions(-) > > diff --git a/include/uapi/linux/media/amlogic/c3-isp-config.h b/include/uapi/linux/media/amlogic/c3-isp-config.h > index ed085ea62a574932c7ad8d59d34b2c5c74a597d8..bf6de55b27a7d4d15effcca5525865650d9070fb 100644 > --- a/include/uapi/linux/media/amlogic/c3-isp-config.h > +++ b/include/uapi/linux/media/amlogic/c3-isp-config.h > @@ -6,8 +6,13 @@ > #ifndef _UAPI_C3_ISP_CONFIG_H_ > #define _UAPI_C3_ISP_CONFIG_H_ > > +#ifdef __KERNEL__ > +#include > +#endif /* __KERNEL__ */ > #include > > +#include > + > /* > * Frames are split into zones of almost equal width and height - a zone is a > * rectangular tile of a frame. The metering blocks within the ISP collect > @@ -176,62 +181,22 @@ enum c3_isp_params_block_type { > C3_ISP_PARAMS_BLOCK_SENTINEL > }; > > -#define C3_ISP_PARAMS_BLOCK_FL_DISABLE (1U << 0) > -#define C3_ISP_PARAMS_BLOCK_FL_ENABLE (1U << 1) > +/* For backward compatibility */ > +#define C3_ISP_PARAMS_BLOCK_FL_DISABLE V4L2_PARAMS_FL_BLOCK_DISABLE > +#define C3_ISP_PARAMS_BLOCK_FL_ENABLE V4L2_PARAMS_FL_BLOCK_ENABLE > > /** > * struct c3_isp_params_block_header - C3 ISP parameter block header > * > * This structure represents the common part of all the ISP configuration > - * blocks. Each parameters block shall embed an instance of this structure type > - * as its first member, followed by the block-specific configuration data. The > - * driver inspects this common header to discern the block type and its size and > - * properly handle the block content by casting it to the correct block-specific > - * type. + * blocks and is identical to :c:type:`v4l2_params_block_header`. > * > * The @type field is one of the values enumerated by s/@type/type/ Please compile the documentation for the next version. I expect the 'struct c3_isp_params_block_header' above to not be appreciated by sphinx as there's no corresponding structure. Reviewed-by: Laurent Pinchart > * :c:type:`c3_isp_params_block_type` and specifies how the data should be > - * interpreted by the driver. The @size field specifies the size of the > - * parameters block and is used by the driver for validation purposes. The > - * @flags field is a bitmask of per-block flags C3_ISP_PARAMS_FL*. > - * > - * When userspace wants to disable an ISP block the > - * C3_ISP_PARAMS_BLOCK_FL_DISABLED bit should be set in the @flags field. In > - * this case userspace may optionally omit the remainder of the configuration > - * block, which will be ignored by the driver. > - * > - * When a new configuration of an ISP block needs to be applied userspace > - * shall fully populate the ISP block and omit setting the > - * C3_ISP_PARAMS_BLOCK_FL_DISABLED bit in the @flags field. > - * > - * Userspace is responsible for correctly populating the parameters block header > - * fields (@type, @flags and @size) and the block-specific parameters. > - * > - * For example: > - * > - * .. code-block:: c > + * interpreted by the driver. > * > - * void populate_pst_gamma(struct c3_isp_params_block_header *block) { > - * struct c3_isp_params_pst_gamma *gamma = > - * (struct c3_isp_params_pst_gamma *)block; > - * > - * gamma->header.type = C3_ISP_PARAMS_BLOCK_PST_GAMMA; > - * gamma->header.flags = C3_ISP_PARAMS_BLOCK_FL_ENABLE; > - * gamma->header.size = sizeof(*gamma); > - * > - * for (unsigned int i = 0; i < 129; i++) > - * gamma->pst_gamma_lut[i] = i; > - * } > - * > - * @type: The parameters block type from :c:type:`c3_isp_params_block_type` > - * @flags: A bitmask of block flags > - * @size: Size (in bytes) of the parameters block, including this header > + * The flags field is a bitmask of per-block flags C3_ISP_PARAMS_FL_*. > */ > -struct c3_isp_params_block_header { > - __u16 type; > - __u16 flags; > - __u32 size; > -}; > +#define c3_isp_params_block_header v4l2_params_block_header > > /** > * struct c3_isp_params_awb_gains - Gains for auto-white balance > @@ -498,26 +463,9 @@ struct c3_isp_params_blc { > /** > * struct c3_isp_params_cfg - C3 ISP configuration parameters > * > - * This struct contains the configuration parameters of the C3 ISP > - * algorithms, serialized by userspace into an opaque data buffer. Each > - * configuration parameter block is represented by a block-specific structure > - * which contains a :c:type:`c3_isp_param_block_header` entry as first > - * member. Userspace populates the @data buffer with configuration parameters > - * for the blocks that it intends to configure. As a consequence, the data > - * buffer effective size changes according to the number of ISP blocks that > - * userspace intends to configure. > - * > - * The parameters buffer is versioned by the @version field to allow modifying > - * and extending its definition. Userspace should populate the @version field to > - * inform the driver about the version it intends to use. The driver will parse > - * and handle the @data buffer according to the data layout specific to the > - * indicated revision and return an error if the desired revision is not > - * supported. > - * > - * For each ISP block that userspace wants to configure, a block-specific > - * structure is appended to the @data buffer, one after the other without gaps > - * in between nor overlaps. Userspace shall populate the @total_size field with > - * the effective size, in bytes, of the @data buffer. > + * This is the driver-specific implementation of :c:type:`v4l2_params_buffer`. > + * > + * Currently only C3_ISP_PARAM_BUFFER_V0 is supported. > * > * The expected memory layout of the parameters buffer is:: > * > @@ -561,4 +509,10 @@ struct c3_isp_params_cfg { > __u8 data[C3_ISP_PARAMS_MAX_SIZE]; > }; > > +#ifdef __KERNEL__ > +/* Make sure the header is type-convertible to the generic v4l2 params one */ > +static_assert((sizeof(struct c3_isp_params_cfg) - C3_ISP_PARAMS_MAX_SIZE) == > + sizeof(struct v4l2_params_buffer)); > +#endif /* __KERNEL__ */ > + > #endif > -- Regards, Laurent Pinchart