From patchwork Tue May 7 16:19:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 13657401 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 08A0FC10F1A for ; Tue, 7 May 2024 16:19:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=/x1NS4UDXgs5hnfydTCUAw7CDRewnltd6zT/lP//c5A=; b=PkKMwxf2urBsxc oPS9moHrqriPrATkEGS8096jbnxiBCnLtKd2dDOuW0H+IwT4R53eAjHQNUljkOcKVo28KJR4VzVmU eMCIXt7BRuFokgsV2duIRldltA+k1dsAWoP0y6H/Oq8YRwe+4JKit5FCMKkAaddffQC1SKtahODD5 LApOedis9zpokyKm6jHbbCkfEx0hiVMoFJXfRwrCV8wDh0tN48c9EgSuub+WbsSEkyAvLcxkGoDra BmxWERiQA4WpMArMYKxdFuQerU0PJngSGZA6A1oMwJqi3t+uTJhcC2AojcmUhxj3dl9eKL0JZIPpi ZNqfy7RJpvedS2sGy1+w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1s4NXQ-0000000Bvpo-2qR2; Tue, 07 May 2024 16:19:32 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1s4NXM-0000000Bvls-3P6l for linux-rockchip@lists.infradead.org; Tue, 07 May 2024 16:19:30 +0000 Received: from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi [81.175.209.231]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id F2E623D5; Tue, 7 May 2024 18:19:14 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1715098755; bh=+xzyc5cQoXDvc9UJEHw3ZxHjT8uRqvLdKFy9guAk8kU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rbB24rF4AiGQ+IUjvg35aK+CZPJq6bJTTyALw+iPoNR1Y4S17UYeZWFjJflnjbUOv Ar/U41NesRYSc5Ps47vCcgZjk8u5do53UaNeBk2XB6Y7bBq9ruNFSlz6ao5wivLY0i t26Fk0PMpsb6MvkU0oIQLIcEmqctDLwmdViRiZ9g= 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 v3 1/2] media: v4l2-subdev: Provide const-aware subdev state accessors Date: Tue, 7 May 2024 19:19:06 +0300 Message-ID: <20240507161907.27747-2-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240507161907.27747-1-laurent.pinchart+renesas@ideasonboard.com> References: <20240507161907.27747-1-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240507_091929_012433_31BB0593 X-CRM114-Status: GOOD ( 15.91 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org 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 Reviewed-by: Sakari Ailus Reviewed-by: Tomi Valkeinen --- Changes since v2: - Specify types explicitly in _Generic() expression - Fix cast of value to const pointer 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..cd3e9e2ebe4d 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 struct v4l2_subdev_state *: (const typeof(*(value)) *)(value), \ + struct v4l2_subdev_state *: (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 16:19:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 13657403 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 EFFFAC25B5F for ; Tue, 7 May 2024 16:19:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=gWWo465111qT2LazEcJNQkL7wVR7/K7M1ItvmCCaWv8=; b=0axHqUdaYRvy9f uZX+HMDAk69n79M9dskPxqL0mUAk+00XZnbr0HDqhRH+yo5L+eOX2tq672pYP2+WITqnF5RMtbtdw 3dj3Q9l2dSgLDhuk+wlnCmEc/LGpg6awOWDhK4LmD1aqk0eM7GsyA9IJG93H7a4WJMfo00Im9fnFE I/As1QvyJ/QtmxFArmHL5vXb43PzIoBExSwgDnFC1K3NO1GDmHW1ANrQH4u3jH1brXYiEutTAls7n WNwK3cinOk0jh7HlfKqoDWM6xe9NzccS6o11X4I9MAxMdPJ3F+VSqguovVr+g80rvjBHfVlcpxZCE BA5Sz0Bda/TRjOgXofOw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1s4NXQ-0000000Bvpf-1Bl5; Tue, 07 May 2024 16:19:32 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1s4NXM-0000000Bvlt-3mqP for linux-rockchip@lists.infradead.org; Tue, 07 May 2024 16:19:30 +0000 Received: from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi [81.175.209.231]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 5805C904; Tue, 7 May 2024 18:19:16 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1715098756; bh=Y0faM+U61JHbDE16uPhf6jDmA9FQGes5Rn/PQHPGf54=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EpAHRehD44aEViIrzxzlJQGCDoi9psZ+ClDC+e7e+gePQ70aKFSMlTGfkarRCGiLW NUPU3hUABI0hMAFvdzaPj9s4ck0ycovtXnUgzCvmDY1NDzBr4IYrtV9lBG0SQ/eyCb E7RyQlgMMfRGMCdwBLX0P+9tN4tLNRip71HZZkCA= 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 v3 2/2] media: rkisp1: Mark subdev state pointers as const Date: Tue, 7 May 2024 19:19:07 +0300 Message-ID: <20240507161907.27747-3-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.43.2 In-Reply-To: <20240507161907.27747-1-laurent.pinchart+renesas@ideasonboard.com> References: <20240507161907.27747-1-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240507_091929_103272_D1563D53 X-CRM114-Status: GOOD ( 10.14 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org 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;