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 7A48AC678D9 for ; Mon, 16 Jan 2023 16:50:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233945AbjAPQuv (ORCPT ); Mon, 16 Jan 2023 11:50:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233852AbjAPQuJ (ORCPT ); Mon, 16 Jan 2023 11:50:09 -0500 Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E14931E0A; Mon, 16 Jan 2023 08:36:35 -0800 (PST) Received: by mail-pl1-x62b.google.com with SMTP id p24so30810779plw.11; Mon, 16 Jan 2023 08:36:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=t9lnbW7BjvrifWHDSouHpQFcwneGBI83vmKhxOETn9Q=; b=DG0zx0ybT+RDoxkJrUUF+OA33NvvQuV4wNv6Ee1PiKPOWdMPDtE2ZioWdfHUfrQi5b J/BlSsmSDKYwfax4UxWT25trYk/wyq7U2ixm5ItQUAPLpdBb3ay4LlHIeSMycN33VBkY I4DJhLwygw8AfLyvlmlqIl3163sBXhpv2KZGFwLq5X9CVzGvS3+YUCvmWTSiZ9Ge1tGO mMVsIIzFNi9iWh8yY/lXi6TtvkmvIXOVWX+QmxGKahdvh73FESs8c9Ppn01jpNav3f4M afkjZJheETv0xEGnziIsWXLxcPwzjvXUFcJ4ww0MbsiCcu6L9PZpr93NaFyGi5u4FQv9 +NeQ== 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=t9lnbW7BjvrifWHDSouHpQFcwneGBI83vmKhxOETn9Q=; b=u05VpDGHWDt39ySdNItT4qw3jIP3XuoWOdNJDA4dstJglkxaSQVZMeIUO3dHoSOKVU oPwfQIT8H03ncdnCbkyC/V3x7tQUoeesNwbipS1TyE9HX/prLzaXCq3eZco8iKH1NLDS BACDtisL/kqr/5xP6k8pYpJ7cJtTvDXL7y9nHNHwYaPvQeKQBdczd7/vXS6V8gk9oeWA knHF8p5zQBab/7+7jJt3q68/AffwevdxcSbEMu9ovvZcYdLSflJej9VeEzBlgBnMGUR/ /ZyoNyalifofH+rrKqIJUTmuHUbTdXbOCxLzrM0SyrqGFXsbpnSlPw07km1RjEHdhtbL 7XWQ== X-Gm-Message-State: AFqh2kqSxMiCYoy9fejh29MMd4y4Lji8ne5dfTprcxysMboOEwB8DM/J dym2jm2p05K75pY4VQtexku83t7zR5DiCV9VVBmXwNZa X-Google-Smtp-Source: AMrXdXv5WiOta8QG+IR0qsy1lGDwT/qNA1W1Ov4g9ZGAGinAShUGB3HetATJwX0yt0nv7oMhddtzUDCLgBDQqsV2PhM= X-Received: by 2002:a17:902:edc5:b0:189:bee:65ee with SMTP id q5-20020a170902edc500b001890bee65eemr20155plk.107.1673886994295; Mon, 16 Jan 2023 08:36:34 -0800 (PST) MIME-Version: 1.0 References: <20221220120754.2040428-1-aford173@gmail.com> <20221220120754.2040428-2-aford173@gmail.com> In-Reply-To: From: Adam Ford Date: Mon, 16 Jan 2023 10:36:22 -0600 Message-ID: Subject: Re: [PATCH V4 2/2] media: i2c: imx219: Support four-lane operation To: Dave Stevenson 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, 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. 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 > > >