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 6DE6CC67871 for ; Mon, 16 Jan 2023 17:28:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234645AbjAPR2t (ORCPT ); Mon, 16 Jan 2023 12:28:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234769AbjAPR2G (ORCPT ); Mon, 16 Jan 2023 12:28:06 -0500 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CDD995AB64 for ; Mon, 16 Jan 2023 09:05:06 -0800 (PST) Received: by mail-pl1-x630.google.com with SMTP id v23so26006272plo.1 for ; Mon, 16 Jan 2023 09:05:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raspberrypi.com; s=google; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=KoU4MiY5NAW5uUyzHbdGl94JYqDc+w3m9+CtivQxG8E=; b=ZedqWuWVV+ZWy0eIdCTpo6kRVSJn7Gi7swnMqZ2txaQmlJLeddXvDV0Yb+CvA0v5cJ QWHZaIkngh2SVys7aWQqmy/ZSmiWhacVLRnd8UQL+Fnvhuytnx9/Hn/pcS7YPqmjrmCD hGKOoVMWw1G6oZ3mZL5XgKkLEM1+TtB9l8snXI25leaD53NZLoALO237PvRZ41C1hxjj 4lggOYE8U3GQKLmgxeCw9Ze3KxBdNxir35iXlYF97yGPimCluPg0RajkQyLKkUozz8fQ 56KGO8SbiOz7sUF+TXL5XQx7Tp4VqG79NiJonU0Gjsea/1ElVjzO4zPV0p0gQLpZv3ln lFSg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=KoU4MiY5NAW5uUyzHbdGl94JYqDc+w3m9+CtivQxG8E=; b=IX2dv1hTvPIVk8GjcSdhJGuf+H+aueC9yKww7L+lF9UXuaKkx4sszUHpUDq9U3O3Tx nsWiMUOPRAbAga55Zrcnuk2wDDKcKncSdkLrnx8QxMiDedbdlkYHcrSB5wLqk4YMKf6y SWJYDbmPyUu3iNdMkPHlNs/kbb9hspqjIGK1BK6YjIcXeIbGjXIGcLFe8H70g/7B/IZl I+L5W6VYUxegQTdkIjDtPful/N33L4HLXRkIbdpUfU8uNhHiIEPsg1y682xwvyrI3HH4 KWxKo93oGj5YCl1xFvrcv1oCyEC5gXBBOh9TahfmDjwXTgDZ5ehT0KyFfXsPA4TOtmPM tvFg== X-Gm-Message-State: AFqh2kr+prVyin0qBLhys/YELCjlf261/2apjnZJ7Wpl0lkl7RU+sBfF 2CpFbzDgN7/rpaq6UrrMhdmrGEKfbYfgAQRHTayzp8BoVDfXhA== X-Google-Smtp-Source: AMrXdXtPJS7l1UHI+JJ3J1+9pN5L61VM7QmeLZpLuTYkYnjopuFka8Ck4uR2jv9I2gg33e+Ay8AOHNBIe5SDOWSKnfI= X-Received: by 2002:a17:90b:1109:b0:226:f85c:e099 with SMTP id gi9-20020a17090b110900b00226f85ce099mr3414283pjb.198.1673888706287; Mon, 16 Jan 2023 09:05:06 -0800 (PST) MIME-Version: 1.0 References: <20221220120754.2040428-1-aford173@gmail.com> <20221220120754.2040428-2-aford173@gmail.com> In-Reply-To: From: Dave Stevenson Date: Mon, 16 Jan 2023 17:04:21 +0000 Message-ID: Subject: Re: [PATCH V4 2/2] media: i2c: imx219: Support four-lane operation To: Adam Ford Cc: linux-media@vger.kernel.org, aford@beaconembedded.com, Mauro Carvalho Chehab , linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 16 Jan 2023 at 16:36, Adam Ford wrote: > > On Mon, Jan 16, 2023 at 8:42 AM Dave Stevenson > wrote: > > > > Hi Adam > > > > Sorry, for the delay. > > > > On Fri, 13 Jan 2023 at 18:41, Adam Ford wrote: > > > > > > On Tue, Dec 20, 2022 at 6:08 AM Adam Ford wrote: > > > > > > > > The imx219 camera is capable of either two-lane or four-lane > > > > operation. When operating in four-lane, both the pixel rate and > > > > link frequency change. Regardless of the mode, however, both > > > > frequencies remain fixed. > > > > > > > > Helper functions are needed to read and set pixel and link frequencies > > > > which also reduces the number of fixed registers in the table of modes. > > > > > > > > Signed-off-by: Adam Ford > > > > I can't test on 4 lanes, but 2 lane modes still work, and the code > > looks reasonable for 4 lanes. > > Thanks! For what it's worth, I tested this on an Renesas RZ/G2M SoC > which has both a 2-lane and 4-lane interface, and I didn't see any > difference in performance or image quality between the 2-lane and > 4-lane modes. It's more that I don't have an IMX219 module that breaks out all 4 lanes. It still works correctly on 2 lanes, so as long as it works for you on 4 lanes, then I'm happy. Dave > adam > > > > Reviewed-by: Dave Stevenson > > > > > > > Gentle nudge on this. > > > > > > > --- > > > > V4: Restore check for nr_of_link_frequencies and update commit message > > > > V3: Keep the helper function doing the link and lane parsing to > > > > keep th probe function small. > > > > > > > > V2: Replace if-else statements with ternary operator > > > > Fix 4-lane Link Rate. > > > > Fix checking the link rate so only the link rate for > > > > the given number of lanes is permitted. > > > > > > > > diff --git a/drivers/media/i2c/imx219.c b/drivers/media/i2c/imx219.c > > > > index 7f44d62047b6..b5fa4986470a 100644 > > > > --- a/drivers/media/i2c/imx219.c > > > > +++ b/drivers/media/i2c/imx219.c > > > > @@ -42,10 +42,16 @@ > > > > /* External clock frequency is 24.0M */ > > > > #define IMX219_XCLK_FREQ 24000000 > > > > > > > > -/* Pixel rate is fixed at 182.4M for all the modes */ > > > > +/* Pixel rate is fixed for all the modes */ > > > > #define IMX219_PIXEL_RATE 182400000 > > > > +#define IMX219_PIXEL_RATE_4LANE 280800000 > > > > > > > > #define IMX219_DEFAULT_LINK_FREQ 456000000 > > > > +#define IMX219_DEFAULT_LINK_FREQ_4LANE 363000000 > > > > + > > > > +#define IMX219_REG_CSI_LANE_MODE 0x0114 > > > > +#define IMX219_CSI_2_LANE_MODE 0x01 > > > > +#define IMX219_CSI_4_LANE_MODE 0x03 > > > > > > > > /* V_TIMING internal */ > > > > #define IMX219_REG_VTS 0x0160 > > > > @@ -299,6 +305,10 @@ static const s64 imx219_link_freq_menu[] = { > > > > IMX219_DEFAULT_LINK_FREQ, > > > > }; > > > > > > > > +static const s64 imx219_link_freq_4lane_menu[] = { > > > > + IMX219_DEFAULT_LINK_FREQ_4LANE, > > > > +}; > > > > + > > > > static const char * const imx219_test_pattern_menu[] = { > > > > "Disabled", > > > > "Color Bars", > > > > @@ -474,6 +484,9 @@ struct imx219 { > > > > > > > > /* Streaming on/off */ > > > > bool streaming; > > > > + > > > > + /* Two or Four lanes */ > > > > + u8 lanes; > > > > }; > > > > > > > > static inline struct imx219 *to_imx219(struct v4l2_subdev *_sd) > > > > @@ -936,6 +949,13 @@ static int imx219_get_selection(struct v4l2_subdev *sd, > > > > return -EINVAL; > > > > } > > > > > > > > +static int imx219_configure_lanes(struct imx219 *imx219) > > > > +{ > > > > + return imx219_write_reg(imx219, IMX219_REG_CSI_LANE_MODE, > > > > + IMX219_REG_VALUE_08BIT, (imx219->lanes == 2) ? > > > > + IMX219_CSI_2_LANE_MODE : IMX219_CSI_4_LANE_MODE); > > > > +}; > > > > + > > > > static int imx219_start_streaming(struct imx219 *imx219) > > > > { > > > > struct i2c_client *client = v4l2_get_subdevdata(&imx219->sd); > > > > @@ -953,6 +973,13 @@ static int imx219_start_streaming(struct imx219 *imx219) > > > > goto err_rpm_put; > > > > } > > > > > > > > + /* Configure two or four Lane mode */ > > > > + ret = imx219_configure_lanes(imx219); > > > > + if (ret) { > > > > + dev_err(&client->dev, "%s failed to configure lanes\n", __func__); > > > > + goto err_rpm_put; > > > > + } > > > > + > > > > /* Apply default values of current mode */ > > > > reg_list = &imx219->mode->reg_list; > > > > ret = imx219_write_regs(imx219, reg_list->regs, reg_list->num_of_regs); > > > > @@ -1184,6 +1211,11 @@ static const struct v4l2_subdev_internal_ops imx219_internal_ops = { > > > > .open = imx219_open, > > > > }; > > > > > > > > +static unsigned long imx219_get_pixel_rate(struct imx219 *imx219) > > > > +{ > > > > + return (imx219->lanes == 2) ? IMX219_PIXEL_RATE : IMX219_PIXEL_RATE_4LANE; > > > > +} > > > > + > > > > /* Initialize control handlers */ > > > > static int imx219_init_controls(struct imx219 *imx219) > > > > { > > > > @@ -1205,15 +1237,16 @@ static int imx219_init_controls(struct imx219 *imx219) > > > > /* By default, PIXEL_RATE is read only */ > > > > imx219->pixel_rate = v4l2_ctrl_new_std(ctrl_hdlr, &imx219_ctrl_ops, > > > > V4L2_CID_PIXEL_RATE, > > > > - IMX219_PIXEL_RATE, > > > > - IMX219_PIXEL_RATE, 1, > > > > - IMX219_PIXEL_RATE); > > > > + imx219_get_pixel_rate(imx219), > > > > + imx219_get_pixel_rate(imx219), 1, > > > > + imx219_get_pixel_rate(imx219)); > > > > > > > > imx219->link_freq = > > > > v4l2_ctrl_new_int_menu(ctrl_hdlr, &imx219_ctrl_ops, > > > > V4L2_CID_LINK_FREQ, > > > > ARRAY_SIZE(imx219_link_freq_menu) - 1, 0, > > > > - imx219_link_freq_menu); > > > > + (imx219->lanes == 2) ? imx219_link_freq_menu : > > > > + imx219_link_freq_4lane_menu); > > > > if (imx219->link_freq) > > > > imx219->link_freq->flags |= V4L2_CTRL_FLAG_READ_ONLY; > > > > > > > > @@ -1308,7 +1341,7 @@ static void imx219_free_controls(struct imx219 *imx219) > > > > mutex_destroy(&imx219->mutex); > > > > } > > > > > > > > -static int imx219_check_hwcfg(struct device *dev) > > > > +static int imx219_check_hwcfg(struct device *dev, struct imx219 *imx219) > > > > { > > > > struct fwnode_handle *endpoint; > > > > struct v4l2_fwnode_endpoint ep_cfg = { > > > > @@ -1328,10 +1361,12 @@ static int imx219_check_hwcfg(struct device *dev) > > > > } > > > > > > > > /* Check the number of MIPI CSI2 data lanes */ > > > > - if (ep_cfg.bus.mipi_csi2.num_data_lanes != 2) { > > > > - dev_err(dev, "only 2 data lanes are currently supported\n"); > > > > + if (ep_cfg.bus.mipi_csi2.num_data_lanes != 2 && > > > > + ep_cfg.bus.mipi_csi2.num_data_lanes != 4) { > > > > + dev_err(dev, "only 2 or 4 data lanes are currently supported\n"); > > > > goto error_out; > > > > } > > > > + imx219->lanes = ep_cfg.bus.mipi_csi2.num_data_lanes; > > > > > > > > /* Check the link frequency set in device tree */ > > > > if (!ep_cfg.nr_of_link_frequencies) { > > > > @@ -1340,7 +1375,8 @@ static int imx219_check_hwcfg(struct device *dev) > > > > } > > > > > > > > if (ep_cfg.nr_of_link_frequencies != 1 || > > > > - ep_cfg.link_frequencies[0] != IMX219_DEFAULT_LINK_FREQ) { > > > > + (ep_cfg.link_frequencies[0] != ((imx219->lanes == 2) ? > > > > + IMX219_DEFAULT_LINK_FREQ : IMX219_DEFAULT_LINK_FREQ_4LANE))) { > > > > dev_err(dev, "Link frequency not supported: %lld\n", > > > > ep_cfg.link_frequencies[0]); > > > > goto error_out; > > > > @@ -1368,7 +1404,7 @@ static int imx219_probe(struct i2c_client *client) > > > > v4l2_i2c_subdev_init(&imx219->sd, client, &imx219_subdev_ops); > > > > > > > > /* Check the hardware configuration in device tree */ > > > > - if (imx219_check_hwcfg(dev)) > > > > + if (imx219_check_hwcfg(dev, imx219)) > > > > return -EINVAL; > > > > > > > > /* Get system clock (xclk) */ > > > > -- > > > > 2.34.1 > > > >