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 X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B92A1C43600 for ; Tue, 13 Apr 2021 02:31:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9DBDC613B7 for ; Tue, 13 Apr 2021 02:31:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245555AbhDMCbd (ORCPT ); Mon, 12 Apr 2021 22:31:33 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:35890 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241199AbhDMCbc (ORCPT ); Mon, 12 Apr 2021 22:31:32 -0400 Received: from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 91F79AF3; Tue, 13 Apr 2021 04:31:10 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1618281071; bh=9w19Yz9qw3aZm4XFvImmkXuVqJ6OoWVHG08SGtxY/U8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=G+nM0xwCuYALTA/UvwA5Sbu7P285Hm31oKsf7B+JEDoFYYW1W4dqaAPk/IYVDO+BL falr9zNbtFgsPscJUuzSbE/lDUokuxGH/x78Jkg5LiqL+oUuoACQ4P3f3s/n5KlubY EthstAkOfFmwbCHHQsl3L4Iu0XKUGB5oiM2X/BHE= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: Rui Miguel Silva , kernel@pengutronix.de, Fabio Estevam , linux-imx@nxp.com, Steve Longerbeam , Philipp Zabel , Marek Vasut Subject: [PATCH 05/23] media: imx: imx7_mipi_csis: Minimize locking in get/set format Date: Tue, 13 Apr 2021 05:29:56 +0300 Message-Id: <20210413023014.28797-6-laurent.pinchart@ideasonboard.com> X-Mailer: git-send-email 2.28.1 In-Reply-To: <20210413023014.28797-1-laurent.pinchart@ideasonboard.com> References: <20210413023014.28797-1-laurent.pinchart@ideasonboard.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Reduce the code sections that are run with the lock held in the get/set format handlers: - mipi_csis_get_format() retrieves a pointer to the format, and thus doesn't need locking as long as the arguments passed to the function don't require locking either. - sdformat is a structure passed by the caller, not an internal state, and thus doesn't require locking. Signed-off-by: Laurent Pinchart --- drivers/staging/media/imx/imx7-mipi-csis.c | 36 ++++++++++++---------- 1 file changed, 20 insertions(+), 16 deletions(-) diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c index 25125e067aa7..bbcd39672f92 100644 --- a/drivers/staging/media/imx/imx7-mipi-csis.c +++ b/drivers/staging/media/imx/imx7-mipi-csis.c @@ -860,8 +860,9 @@ static int mipi_csis_get_fmt(struct v4l2_subdev *mipi_sd, struct csi_state *state = mipi_sd_to_csis_state(mipi_sd); struct v4l2_mbus_framefmt *fmt; - mutex_lock(&state->lock); fmt = mipi_csis_get_format(state, cfg, sdformat->which, sdformat->pad); + + mutex_lock(&state->lock); sdformat->format = *fmt; mutex_unlock(&state->lock); @@ -919,24 +920,17 @@ static int mipi_csis_set_fmt(struct v4l2_subdev *mipi_sd, if (sdformat->pad != CSIS_PAD_SINK) return -EINVAL; - fmt = mipi_csis_get_format(state, cfg, sdformat->which, sdformat->pad); - - mutex_lock(&state->lock); - - /* Validate the media bus code and clamp the size. */ - csis_fmt = find_csis_format(sdformat->format.code); - if (!csis_fmt) - csis_fmt = &mipi_csis_formats[0]; - - fmt->code = csis_fmt->code; - fmt->width = sdformat->format.width; - fmt->height = sdformat->format.height; - /* + * Validate the media bus code and clamp and align the size. + * * The total number of bits per line must be a multiple of 8. We thus * need to align the width for formats that are not multiples of 8 * bits. */ + csis_fmt = find_csis_format(sdformat->format.code); + if (!csis_fmt) + csis_fmt = &mipi_csis_formats[0]; + switch (csis_fmt->width % 8) { case 0: align = 0; @@ -956,8 +950,18 @@ static int mipi_csis_set_fmt(struct v4l2_subdev *mipi_sd, break; } - v4l_bound_align_image(&fmt->width, 1, CSIS_MAX_PIX_WIDTH, align, - &fmt->height, 1, CSIS_MAX_PIX_HEIGHT, 0, 0); + v4l_bound_align_image(&sdformat->format.width, 1, + CSIS_MAX_PIX_WIDTH, align, + &sdformat->format.height, 1, + CSIS_MAX_PIX_HEIGHT, 0, 0); + + fmt = mipi_csis_get_format(state, cfg, sdformat->which, sdformat->pad); + + mutex_lock(&state->lock); + + fmt->code = csis_fmt->code; + fmt->width = sdformat->format.width; + fmt->height = sdformat->format.height; sdformat->format = *fmt; -- Regards, Laurent Pinchart