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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9A26C678D4 for ; Tue, 7 Mar 2023 17:43:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231963AbjCGRm7 (ORCPT ); Tue, 7 Mar 2023 12:42:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54252 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232027AbjCGRmm (ORCPT ); Tue, 7 Mar 2023 12:42:42 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 55FB799BE9 for ; Tue, 7 Mar 2023 09:38:35 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 6C6F961525 for ; Tue, 7 Mar 2023 17:38:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 623F6C4339C; Tue, 7 Mar 2023 17:38:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678210702; bh=HfELA5bv6JNGGKsubN/vePsaoGTwJhQONqPLJajGitU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rpGJdTsTptsrNCZB653hyCXNhSObtNHKhpqdbX0Z0c7hHd8IZNdKrddRR5DvfQBRt KP5uUZJlW31bel6XPL/cEITKR7eyx4DAxLMLF4Pd2iB/QAN2Xzu0rZIG0rH2TctOP8 zbC5Hvj4VTt6UCiFu8wB8wTE+c/YjtokI3MaxkaE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Nishanth Menon , Jai Luthra , Jacopo Mondi , Sakari Ailus , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 6.2 0596/1001] media: ov5640: Handle delays when no reset_gpio set Date: Tue, 7 Mar 2023 17:56:08 +0100 Message-Id: <20230307170047.357957072@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307170022.094103862@linuxfoundation.org> References: <20230307170022.094103862@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jai Luthra [ Upstream commit d7ff69139908842adf824be4f50c7e9ac5886c04 ] Some module manufacturers [1][2] don't expose the RESETB and PWDN pins of the sensor directly through the 15-pin FFC connector. Instead wiring ~PWDN gpio to the sensor pins with appropriate delays. In such cases, reset_gpio will not be available to the driver, but it will still be toggled when the sensor is powered on, and thus we should still honor the wait time of >= 5ms + 1ms + 20ms (see figure 2-3 in [3]) before attempting any i/o operations over SCCB. Also, rename the function to ov5640_powerup_sequence to better match the datasheet (section 2.7). [1] https://digilent.com/reference/_media/reference/add-ons/pcam-5c/pcam_5c_sch.pdf [2] https://www.alinx.com/public/upload/file/AN5641_User_Manual.pdf [3] https://cdn.sparkfun.com/datasheets/Sensors/LightImaging/OV5640_datasheet.pdf Fixes: 19a81c1426c1 ("[media] add Omnivision OV5640 sensor driver") Reported-by: Nishanth Menon Signed-off-by: Jai Luthra Reviewed-by: Jacopo Mondi Signed-off-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/i2c/ov5640.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c index 75dada60298b5..c159f297ab92a 100644 --- a/drivers/media/i2c/ov5640.c +++ b/drivers/media/i2c/ov5640.c @@ -2425,11 +2425,22 @@ static void ov5640_power(struct ov5640_dev *sensor, bool enable) gpiod_set_value_cansleep(sensor->pwdn_gpio, enable ? 0 : 1); } -static void ov5640_reset(struct ov5640_dev *sensor) +/* + * From section 2.7 power up sequence: + * t0 + t1 + t2 >= 5ms Delay from DOVDD stable to PWDN pull down + * t3 >= 1ms Delay from PWDN pull down to RESETB pull up + * t4 >= 20ms Delay from RESETB pull up to SCCB (i2c) stable + * + * Some modules don't expose RESETB/PWDN pins directly, instead providing a + * "PWUP" GPIO which is wired through appropriate delays and inverters to the + * pins. + * + * In such cases, this gpio should be mapped to pwdn_gpio in the driver, and we + * should still toggle the pwdn_gpio below with the appropriate delays, while + * the calls to reset_gpio will be ignored. + */ +static void ov5640_powerup_sequence(struct ov5640_dev *sensor) { - if (!sensor->reset_gpio) - return; - if (sensor->pwdn_gpio) { gpiod_set_value_cansleep(sensor->reset_gpio, 0); @@ -2478,8 +2489,7 @@ static int ov5640_set_power_on(struct ov5640_dev *sensor) goto xclk_off; } - ov5640_reset(sensor); - ov5640_power(sensor, true); + ov5640_powerup_sequence(sensor); ret = ov5640_init_slave_id(sensor); if (ret) -- 2.39.2