From patchwork Tue May 7 06:03:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 13656301 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (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 E4F906BFD5; Tue, 7 May 2024 06:03:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715061817; cv=none; b=jXuTkncYc3ysrZjtjNqcXo60AXwkJT/5GqJox+ZrN0zIwqIdnKt11wI9P9jt2n9nxnMQ4uCyQ1iXmNIjsoBnbstUM7cgRCDEjATCzFQJNpdaIACrUpoMW0w5T6xo0ovqjYLQnBP894Fr9lok1SWo5XDYYejPFRakURk6n9y4dvw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715061817; c=relaxed/simple; bh=CAfZBviyEOgNMqsGAM9sVQjH0LaJVid1J1G79UQlAb4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZNc7+e72xv1kfCHSfhsu7LVz/nOay7Gi2svRFQfZoC5QnPT8Ep5FTGm5gSFTtg9sbxDLlDR0jMnn8zq4VGGiNXHUCCVGWxxW2Je14+pyULLy5htwk1KG5R7QngYFSVSpk4B/mfoCDKKxbz2oszmvcRHx5fQaHQYli3+vKJNVQy4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=UnNNn23e; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="UnNNn23e" Received: from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi [81.175.209.231]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 101ABA98; Tue, 7 May 2024 08:03:31 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1715061811; bh=CAfZBviyEOgNMqsGAM9sVQjH0LaJVid1J1G79UQlAb4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UnNNn23ezDwfKmjV52iKAmgE72r7W2zhEZII5A/1ySGgNqm8MCuW9aXm+vypdzqcO 3Nvw2nKQYkQ82bPlvD7M2YxOjoG6cQmPnM2ClldQJNYZlfAZ0gZjxmMsJHfPKGBekz d/vVpA2Mqbuo3b0uxVqGtLSAZD6CMQZe8h95esLQ= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Sakari Ailus , Tomi Valkeinen , Hans Verkuil , Dafna Hirschfeld , linux-rockchip@lists.infradead.org Subject: [PATCH v2 1/2] media: v4l2-subdev: Provide const-aware subdev state accessors Date: Tue, 7 May 2024 09:03:22 +0300 Message-ID: <20240507060323.26950-2-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240507060323.26950-1-laurent.pinchart+renesas@ideasonboard.com> References: <20240507060323.26950-1-laurent.pinchart+renesas@ideasonboard.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 It would be useful to mark instances of v4l2_subdev_state structures as const when code needs to access them read-only. This isn't currently possible, as the v4l2_subdev_state_get_*() accessor functions take a non-const pointer to the state. Use _Generic() to provide two different versions of the accessors, for const and non-const states respectively. The former returns a const pointer to the requested format, rectangle or interval, implementing const-correctness. The latter returns a non-const pointer, preserving the current behaviour for drivers. Signed-off-by: Laurent Pinchart --- Changes since v1: - Wrap the accessors with _Generic() using a single macro instead of adding a _Generic() statement in each of them. --- include/media/v4l2-subdev.h | 40 +++++++++++++++++++++++++------------ 1 file changed, 27 insertions(+), 13 deletions(-) diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index e30c463d90e5..c8cfa1eaa82f 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -1326,6 +1326,16 @@ void v4l2_subdev_cleanup(struct v4l2_subdev *sd); #define __v4l2_subdev_state_gen_call(NAME, _1, ARG, ...) \ __v4l2_subdev_state_get_ ## NAME ## ARG +/* + * A macro to constify the return value of the state accessors when the state + * parameter is const. + */ +#define __v4l2_subdev_state_constify_call(state, value) \ + _Generic(state, \ + const typeof(*(state)) *: (const typeof(value))value, \ + default: value \ + ) + /** * v4l2_subdev_state_get_format() - Get pointer to a stream format * @state: subdevice state @@ -1340,16 +1350,17 @@ void v4l2_subdev_cleanup(struct v4l2_subdev *sd); */ /* * Wrap v4l2_subdev_state_get_format(), allowing the function to be called with - * two or three arguments. The purpose of the __v4l2_subdev_state_get_format() + * two or three arguments. The purpose of the __v4l2_subdev_state_gen_call() * macro below is to come up with the name of the function or macro to call, * using the last two arguments (_stream and _pad). The selected function or * macro is then called using the arguments specified by the caller. A similar * arrangement is used for v4l2_subdev_state_crop() and * v4l2_subdev_state_compose() below. */ -#define v4l2_subdev_state_get_format(state, pad, ...) \ - __v4l2_subdev_state_gen_call(format, ##__VA_ARGS__, , _pad) \ - (state, pad, ##__VA_ARGS__) +#define v4l2_subdev_state_get_format(state, pad, ...) \ + __v4l2_subdev_state_constify_call(state, \ + __v4l2_subdev_state_gen_call(format, ##__VA_ARGS__, , _pad) \ + ((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__)) #define __v4l2_subdev_state_get_format_pad(state, pad) \ __v4l2_subdev_state_get_format(state, pad, 0) struct v4l2_mbus_framefmt * @@ -1368,9 +1379,10 @@ __v4l2_subdev_state_get_format(struct v4l2_subdev_state *state, * For stream-unaware drivers the crop rectangle for the corresponding pad is * returned. If the pad does not exist, NULL is returned. */ -#define v4l2_subdev_state_get_crop(state, pad, ...) \ - __v4l2_subdev_state_gen_call(crop, ##__VA_ARGS__, , _pad) \ - (state, pad, ##__VA_ARGS__) +#define v4l2_subdev_state_get_crop(state, pad, ...) \ + __v4l2_subdev_state_constify_call(state, \ + __v4l2_subdev_state_gen_call(crop, ##__VA_ARGS__, , _pad) \ + ((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__)) #define __v4l2_subdev_state_get_crop_pad(state, pad) \ __v4l2_subdev_state_get_crop(state, pad, 0) struct v4l2_rect * @@ -1389,9 +1401,10 @@ __v4l2_subdev_state_get_crop(struct v4l2_subdev_state *state, unsigned int pad, * For stream-unaware drivers the compose rectangle for the corresponding pad is * returned. If the pad does not exist, NULL is returned. */ -#define v4l2_subdev_state_get_compose(state, pad, ...) \ - __v4l2_subdev_state_gen_call(compose, ##__VA_ARGS__, , _pad) \ - (state, pad, ##__VA_ARGS__) +#define v4l2_subdev_state_get_compose(state, pad, ...) \ + __v4l2_subdev_state_constify_call(state, \ + __v4l2_subdev_state_gen_call(compose, ##__VA_ARGS__, , _pad) \ + ((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__)) #define __v4l2_subdev_state_get_compose_pad(state, pad) \ __v4l2_subdev_state_get_compose(state, pad, 0) struct v4l2_rect * @@ -1410,9 +1423,10 @@ __v4l2_subdev_state_get_compose(struct v4l2_subdev_state *state, * For stream-unaware drivers the frame interval for the corresponding pad is * returned. If the pad does not exist, NULL is returned. */ -#define v4l2_subdev_state_get_interval(state, pad, ...) \ - __v4l2_subdev_state_gen_call(interval, ##__VA_ARGS__, , _pad) \ - (state, pad, ##__VA_ARGS__) +#define v4l2_subdev_state_get_interval(state, pad, ...) \ + __v4l2_subdev_state_constify_call(state, \ + __v4l2_subdev_state_gen_call(interval, ##__VA_ARGS__, , _pad) \ + ((struct v4l2_subdev_state *)state, pad, ##__VA_ARGS__)) #define __v4l2_subdev_state_get_interval_pad(state, pad) \ __v4l2_subdev_state_get_interval(state, pad, 0) struct v4l2_fract * From patchwork Tue May 7 06:03:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 13656302 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (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 626316EB70; Tue, 7 May 2024 06:03:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715061820; cv=none; b=KQmkPN9IzjAKb2WbyFuJ1NpBdGKuswi7z9C3e+gzk6+wuAdI60tqb878GyRifEda2kQAcLSstASBacc5K9CFz4I+JFP7tHlX1WzskZMf7KGdc9TVDmC5k6x8rdR0DVkAkQQMlKz8NKr2jWM8+JCQ/adMnhImkTaAMR/zhz/fehM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715061820; c=relaxed/simple; bh=Y0faM+U61JHbDE16uPhf6jDmA9FQGes5Rn/PQHPGf54=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=o1sTtMXoAiDCzpf50ZT1HPCd1XVO8vA2ZPVWXcYS/OP/3gx04LiEMBbbD78QbwJq+UdDYk5Otm+SywwNShNkTltdku4n3jQKjCQxAu4vsiLSLfUX9OAgxgvKOUp1LjtAQqXPvPche+DdfOf2fSdPd1I5HkFWXXskG1rbvL5bdWQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=o3YBl3Xf; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="o3YBl3Xf" Received: from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi [81.175.209.231]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 73FC5DC9; Tue, 7 May 2024 08:03:32 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1715061812; bh=Y0faM+U61JHbDE16uPhf6jDmA9FQGes5Rn/PQHPGf54=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=o3YBl3Xf4ALliRL1YcnRiMZ5bCxe3qA1IKOqW9GKq7scna5B2beX6bPbaKigtInP4 RhL/GotNt4PJbj93zHN0kkKsss5voFjwM7AfakWkBY6xiLGFHs5L96upBd+kcNCKxG fgUcmQS04LhoJXlNVTt0DoOnE1f6avrbrJxvTzi4= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Sakari Ailus , Tomi Valkeinen , Hans Verkuil , Dafna Hirschfeld , linux-rockchip@lists.infradead.org Subject: [PATCH v2 2/2] media: rkisp1: Mark subdev state pointers as const Date: Tue, 7 May 2024 09:03:23 +0300 Message-ID: <20240507060323.26950-3-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240507060323.26950-1-laurent.pinchart+renesas@ideasonboard.com> References: <20240507060323.26950-1-laurent.pinchart+renesas@ideasonboard.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Several subdev state pointers are used to access the state read-only. Mark them as const. Signed-off-by: Laurent Pinchart --- drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c | 8 ++++---- drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c | 8 ++++---- 2 files changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c index e45a213baf49..91301d17d356 100644 --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c @@ -173,7 +173,7 @@ static void rkisp1_gasket_disable(struct rkisp1_device *rkisp1) * or at the frame end interrupt */ static void rkisp1_config_ism(struct rkisp1_isp *isp, - struct v4l2_subdev_state *sd_state) + const struct v4l2_subdev_state *sd_state) { const struct v4l2_rect *src_crop = v4l2_subdev_state_get_crop(sd_state, @@ -201,7 +201,7 @@ static void rkisp1_config_ism(struct rkisp1_isp *isp, * configure ISP blocks with input format, size...... */ static int rkisp1_config_isp(struct rkisp1_isp *isp, - struct v4l2_subdev_state *sd_state, + const struct v4l2_subdev_state *sd_state, enum v4l2_mbus_type mbus_type, u32 mbus_flags) { struct rkisp1_device *rkisp1 = isp->rkisp1; @@ -309,7 +309,7 @@ static int rkisp1_config_isp(struct rkisp1_isp *isp, if (src_fmt->pixel_enc == V4L2_PIXEL_ENC_BAYER) { rkisp1_params_disable(&rkisp1->params); } else { - struct v4l2_mbus_framefmt *src_frm; + const struct v4l2_mbus_framefmt *src_frm; src_frm = v4l2_subdev_state_get_format(sd_state, RKISP1_ISP_PAD_SOURCE_VIDEO); @@ -429,7 +429,7 @@ static void rkisp1_config_clk(struct rkisp1_isp *isp) } static int rkisp1_isp_start(struct rkisp1_isp *isp, - struct v4l2_subdev_state *sd_state, + const struct v4l2_subdev_state *sd_state, struct media_pad *source) { struct rkisp1_device *rkisp1 = isp->rkisp1; diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c index 6f3931ca5b51..1fa991227fa9 100644 --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c @@ -135,11 +135,11 @@ static void rkisp1_dcrop_disable(struct rkisp1_resizer *rsz, /* configure dual-crop unit */ static void rkisp1_dcrop_config(struct rkisp1_resizer *rsz, - struct v4l2_subdev_state *sd_state) + const struct v4l2_subdev_state *sd_state) { struct rkisp1_device *rkisp1 = rsz->rkisp1; - struct v4l2_mbus_framefmt *sink_fmt; - struct v4l2_rect *sink_crop; + const struct v4l2_mbus_framefmt *sink_fmt; + const struct v4l2_rect *sink_crop; u32 dc_ctrl; sink_crop = v4l2_subdev_state_get_crop(sd_state, RKISP1_RSZ_PAD_SINK); @@ -264,7 +264,7 @@ static void rkisp1_rsz_config_regs(struct rkisp1_resizer *rsz, } static void rkisp1_rsz_config(struct rkisp1_resizer *rsz, - struct v4l2_subdev_state *sd_state, + const struct v4l2_subdev_state *sd_state, enum rkisp1_shadow_regs_when when) { const struct rkisp1_rsz_yuv_mbus_info *sink_yuv_info, *src_yuv_info;