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=-15.8 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 autolearn=unavailable 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 CFB22C43332 for ; Thu, 14 Jan 2021 02:03:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A0BE923447 for ; Thu, 14 Jan 2021 02:03:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729216AbhANCCF (ORCPT ); Wed, 13 Jan 2021 21:02:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39742 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727009AbhAMXYZ (ORCPT ); Wed, 13 Jan 2021 18:24:25 -0500 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8C084C0617B1; Wed, 13 Jan 2021 15:23:44 -0800 (PST) Received: from pendragon.ideasonboard.com (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id D74A82B3; Thu, 14 Jan 2021 00:23:42 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1610580223; bh=5S2iSaf/NmC3AEKI99ksJq5/SvaCPBBUy0hssBB/JbE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=XyDuOQttLypaHaVfrW5+YsVK3ZAFwPW9kHLL/A9LcZ+Ga7lezOooyYix/R+88VcSD LlpdU9YCsepZ5zqOWsxCZhqeuLLcJ4tTr/bDkWn1lyRDvQ+I/tzz4XEV/IeTMCgoUM LJmanIYMCFnu8pG+rlrjmNBmfSjlLEU56wc2caeM= Date: Thu, 14 Jan 2021 01:23:25 +0200 From: Laurent Pinchart To: Jacopo Mondi Cc: kieran.bingham+renesas@ideasonboard.com, laurent.pinchart+renesas@ideasonboard.com, niklas.soderlund+renesas@ragnatech.se, geert@linux-m68k.org, linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Hyun Kwon , Manivannan Sadhasivam , sergei.shtylyov@gmail.com Subject: Re: [PATCH v7 3/7] fixup! media: i2c: rdacm21: Break-out ov10640 initialization Message-ID: References: <20210113185506.119808-1-jacopo+renesas@jmondi.org> <20210113185506.119808-4-jacopo+renesas@jmondi.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20210113185506.119808-4-jacopo+renesas@jmondi.org> Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Hi Jacopo, Thank you for the patch. On Wed, Jan 13, 2021 at 07:55:01PM +0100, Jacopo Mondi wrote: > The embedded OV490 ISP chip provides a secondary SCCB interface and > two GPIO lines to control the connected OV10640 image sensor. > > Break out the OV10640 initialization from the OV490 initialization and > explicitely control the powerdown and reset GPIOs. After the image s/explicitely/explicitly/ > sensor has been hard reset, implement a more clear handling of the > secondary SCCB interface to read the image sensor chip ID. > > Signed-off-by: Jacopo Mondi > --- > drivers/media/i2c/rdacm21.c | 75 ++++++++++++++++++++++++++++++------- > 1 file changed, 61 insertions(+), 14 deletions(-) > > diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c > index 0428e3209463..944009687de5 100644 > --- a/drivers/media/i2c/rdacm21.c > +++ b/drivers/media/i2c/rdacm21.c > @@ -30,11 +30,24 @@ > #define OV490_PAGE_HIGH_REG 0xfffd > #define OV490_PAGE_LOW_REG 0xfffe > > +/* > + * The SCCB slave handling is undocumented; the registers naming scheme is > + * totally arbitrary. > + */ > +#define OV490_SCCB_SLAVE_WRITE 0x00 > +#define OV490_SCCB_SLAVE_READ 0x01 > +#define OV490_SCCB_SLAVE0_DIR 0x80195000 > +#define OV490_SCCB_SLAVE0_ADDR_HIGH 0x80195001 > +#define OV490_SCCB_SLAVE0_ADDR_LOW 0x80195002 > + > #define OV490_DVP_CTRL3 0x80286009 > > #define OV490_ODS_CTRL_FRAME_OUTPUT_EN 0x0c > #define OV490_ODS_CTRL 0x8029d000 > > +#define OV490_HOST_CMD 0x808000c0 > +#define OV490_HOST_CMD_TRIGGER 0xc1 > + > #define OV490_ID_VAL 0x0490 > #define OV490_ID(_p, _v) ((((_p) & 0xff) << 8) | ((_v) & 0xff)) > #define OV490_PID 0x8080300a > @@ -42,12 +55,22 @@ > #define OV490_PID_TIMEOUT 20 > #define OV490_OUTPUT_EN_TIMEOUT 300 > > +#define OV490_GPIO0_RESETB 0x01 Shouldn't this be named just OV490_GPIO0 ? The fact that it's connected to the RESETB signal of the OV10640 is board-specific, not an OV490 intrinsic property. BIT(0) ? > +#define OV490_SPWDN0 0x01 Same here. > +#define OV490_GPIO_SEL0 0x80800050 > +#define OV490_GPIO_SEL1 0x80800051 > +#define OV490_GPIO_DIRECTION0 0x80800054 > +#define OV490_GPIO_DIRECTION1 0x80800055 > +#define OV490_GPIO_OUTPUT_VALUE0 0x80800058 > +#define OV490_GPIO_OUTPUT_VALUE1 0x80800059 > + > #define OV490_ISP_HSIZE_LOW 0x80820060 > #define OV490_ISP_HSIZE_HIGH 0x80820061 > #define OV490_ISP_VSIZE_LOW 0x80820062 > #define OV490_ISP_VSIZE_HIGH 0x80820063 > > -#define OV10640_ID_LOW 0xa6 > +#define OV10640_ID_HIGH 0xa6 > +#define OV10640_CHIP_ID 0x300a > #define OV10640_PIXEL_RATE 55000000 > > struct rdacm21_device { > @@ -306,6 +329,39 @@ static const struct v4l2_subdev_ops rdacm21_subdev_ops = { > .pad = &rdacm21_subdev_pad_ops, > }; > > +static int ov10640_initialize(struct rdacm21_device *dev) > +{ > + u8 val; > + > + /* Power-up OV10640 by setting RESETB and PWDNB pins high. */ > + ov490_write_reg(dev, OV490_GPIO_SEL0, OV490_GPIO0_RESETB); > + ov490_write_reg(dev, OV490_GPIO_SEL1, OV490_SPWDN0); > + ov490_write_reg(dev, OV490_GPIO_DIRECTION0, OV490_GPIO0_RESETB); > + ov490_write_reg(dev, OV490_GPIO_DIRECTION1, OV490_SPWDN0); > + ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_GPIO0_RESETB); > + ov490_write_reg(dev, OV490_GPIO_OUTPUT_VALUE0, OV490_SPWDN0); > + usleep_range(3000, 5000); So the OV490 firmware doesn't handle this ? > + > + /* Read OV10640 ID to test communications. */ > + ov490_write_reg(dev, OV490_SCCB_SLAVE0_DIR, OV490_SCCB_SLAVE_READ); > + ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_HIGH, OV10640_CHIP_ID >> 8); > + ov490_write_reg(dev, OV490_SCCB_SLAVE0_ADDR_LOW, (u8)OV10640_CHIP_ID); > + > + /* Trigger SCCB slave transaction and give it some time to complete. */ > + ov490_write_reg(dev, OV490_HOST_CMD, OV490_HOST_CMD_TRIGGER); > + usleep_range(1000, 1500); > + > + ov490_read_reg(dev, OV490_SCCB_SLAVE0_DIR, &val); > + if (val != OV10640_ID_HIGH) { > + dev_err(dev->dev, "OV10640 ID mismatch: (0x%02x)\n", val); > + return -ENODEV; > + } Would it make sense to create an ov490_sensor_read() helper ? > + > + dev_dbg(dev->dev, "OV10640 ID = 0x%2x\n", val); > + > + return 0; > +} > + > static int ov490_initialize(struct rdacm21_device *dev) > { > u8 pid, ver, val; > @@ -349,20 +405,11 @@ static int ov490_initialize(struct rdacm21_device *dev) > return -ENODEV; > } > > - /* Read OV10640 Id to test communications. */ > - ov490_write_reg(dev, 0x80195000, 0x01); > - ov490_write_reg(dev, 0x80195001, 0x30); > - ov490_write_reg(dev, 0x80195002, 0x0a); > - ov490_write_reg(dev, 0x808000c0, 0xc1); > - > - ov490_read_reg(dev, 0x80195000, &val); > - if (val != OV10640_ID_LOW) { > - dev_err(dev->dev, "OV10640 ID mismatch: (0x%02x)\n", val); > - return -ENODEV; > - } > - > - dev_dbg(dev->dev, "OV10640 ID = 0x%2x\n", val); > + ret = ov10640_initialize(dev); > + if (ret) > + return ret; > > + /* Program OV490 with register-value table. */ > for (i = 0; i < ARRAY_SIZE(ov490_regs_wizard); ++i) { > ret = ov490_write(dev, ov490_regs_wizard[i].reg, > ov490_regs_wizard[i].val); -- Regards, Laurent Pinchart