From patchwork Tue Dec 27 17:36:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jai Luthra X-Patchwork-Id: 88463 X-Patchwork-Delegate: sakari.ailus@iki.fi Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1pADsy-006vkG-1i; Tue, 27 Dec 2022 17:37:11 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231394AbiL0RhA (ORCPT + 1 other); Tue, 27 Dec 2022 12:37:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229936AbiL0Rg6 (ORCPT ); Tue, 27 Dec 2022 12:36:58 -0500 Received: from fllv0015.ext.ti.com (fllv0015.ext.ti.com [198.47.19.141]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01C882673 for ; Tue, 27 Dec 2022 09:36:56 -0800 (PST) Received: from lelv0266.itg.ti.com ([10.180.67.225]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id 2BRHalGi120160; Tue, 27 Dec 2022 11:36:47 -0600 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1672162607; bh=TKFpgCwaGk51ZryVFVD/+9Qqr5/MslTxPOL/w2d4LTA=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=VszLB4zH7tSS9pfUlfFZppI5KJsYlqEVovLg3ZNIh/gY62jAmSpQXL/qiFFdvb8JB ox5m5Q2BUY96IvUvbtNHBxEDMu2DP6u0jBqLgUZ45VmPMa1Kr9eG6AufrJyTQNMWZA bBQUdJMKuRkZIER6X2kxlISYG6BNIs+fNYsJKEds= Received: from DFLE102.ent.ti.com (dfle102.ent.ti.com [10.64.6.23]) by lelv0266.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 2BRHalFj086411 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 27 Dec 2022 11:36:47 -0600 Received: from DFLE112.ent.ti.com (10.64.6.33) by DFLE102.ent.ti.com (10.64.6.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16; Tue, 27 Dec 2022 11:36:47 -0600 Received: from lelv0326.itg.ti.com (10.180.67.84) by DFLE112.ent.ti.com (10.64.6.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.16 via Frontend Transport; Tue, 27 Dec 2022 11:36:47 -0600 Received: from localhost (ileaxei01-snat2.itg.ti.com [10.180.69.6]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 2BRHakZq028507; Tue, 27 Dec 2022 11:36:47 -0600 From: Jai Luthra To: Steve Longerbeam , Mauro Carvalho Chehab , Sakari Ailus , Jacopo Mondi CC: , Nishanth Menon , Jai Luthra Subject: [PATCH v3 1/3] media: ov5640: Handle delays when no reset_gpio set Date: Tue, 27 Dec 2022 23:06:32 +0530 Message-ID: <20221227173634.5752-2-j-luthra@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221227173634.5752-1-j-luthra@ti.com> References: <20221227173634.5752-1-j-luthra@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -2.5 (--) X-LSpam-Report: No, score=-2.5 required=5.0 tests=BAYES_00=-1.9,DKIMWL_WL_HIGH=0.001,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1 autolearn=ham autolearn_force=no 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") Signed-off-by: Jai Luthra Reviewed-by: Jacopo Mondi --- 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 e0f908af581b..e6525caa9b8c 100644 --- a/drivers/media/i2c/ov5640.c +++ b/drivers/media/i2c/ov5640.c @@ -2424,11 +2424,22 @@ 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; - gpiod_set_value_cansleep(sensor->reset_gpio, 0); /* camera power cycle */ @@ -2464,8 +2475,7 @@ 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)