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 E7243C4332F for ; Wed, 14 Dec 2022 09:00:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237857AbiLNJAs (ORCPT ); Wed, 14 Dec 2022 04:00:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237224AbiLNJAq (ORCPT ); Wed, 14 Dec 2022 04:00:46 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 30FB4B5F for ; Wed, 14 Dec 2022 01:00:45 -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 B0BD161871 for ; Wed, 14 Dec 2022 09:00:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4AB93C433D2; Wed, 14 Dec 2022 09:00:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1671008444; bh=OUrIeBrSPIOjDM5mNSWxlgtbSOIPYTSg6sFJ0j7pkrE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=bkU7NPkSngjxvsPtosTu1P/HAKMg9xmLihYrDwsKkNZLlifhpXuAMwGGG5lTTPQFN CIemETBTjYcW2LJcb2G/9VK996Q5fMYYfcKFGxrrat3MLdm5NCGw5Iw5S5wCVr1rML kM6R71HVjf8mnzj5JeU4wUWcdkEjkSLso7qh/x3hh5Ek0POhl1K7o2MqFvE6i784/f 4o4PFX6UktkRziSrhQR0y9dPEmdorz1VFoB5ANm1Ch8uFyO5Ad1EPSQesHYVEB5mH0 F7FwK6XYmXalK84oele2Ghc/nQ1B+jIBDNIYqZDbkF0GZ9KCsuc6n2FDOaxAP73PRR 2jvqEUFD1kLkw== Message-ID: Date: Wed, 14 Dec 2022 11:00:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2 Subject: Re: [PATCH 1/2] phy: ti: j721e-wiz: Manage TypeC lane swap if typec-gpio-dir not specified Content-Language: en-US To: Sinthu Raja , Vinod Koul , Ravi Gunasekaran , Siddharth Vadapalli Cc: Vignesh Raghavendra , linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org, Sinthu Raja References: <20221213124854.3779-1-sinthu.raja@ti.com> <20221213124854.3779-2-sinthu.raja@ti.com> From: Roger Quadros In-Reply-To: <20221213124854.3779-2-sinthu.raja@ti.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sinthu, On 13/12/2022 14:48, Sinthu Raja wrote: > It's possible that the Type-C plug orientation on the DIR line will be > implemented through hardware design. In that situation, there won't be > an external GPIO line available, but the driver still needs to address > this since the DT won't use the typec-gpio-dir property. The property is actually "typec-dir-gpios" > > Add code to handle LN10 Type-C swap if typec-gpio-dir property is not > specified in DT. > > Remove typec-gpio-dir check to use minimum debounce from Type-C spec if > it is not provided in DT Why? > > Signed-off-by: Sinthu Raja > --- > drivers/phy/ti/phy-j721e-wiz.c | 65 +++++++++++++++++++++------------- > 1 file changed, 40 insertions(+), 25 deletions(-) > > diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c > index 141b51af4427..b17eec632d49 100644 > --- a/drivers/phy/ti/phy-j721e-wiz.c > +++ b/drivers/phy/ti/phy-j721e-wiz.c > @@ -375,6 +375,7 @@ struct wiz { > struct gpio_desc *gpio_typec_dir; > int typec_dir_delay; > u32 lane_phy_type[WIZ_MAX_LANES]; > + u32 lane_phy_reg[WIZ_MAX_LANES]; > struct clk *input_clks[WIZ_MAX_INPUT_CLOCKS]; > struct clk *output_clks[WIZ_MAX_OUTPUT_CLOCKS]; > struct clk_onecell_data clk_data; > @@ -1231,14 +1232,28 @@ static int wiz_phy_reset_deassert(struct reset_controller_dev *rcdev, > int ret; > > /* if typec-dir gpio was specified, set LN10 SWAP bit based on that */ > - if (id == 0 && wiz->gpio_typec_dir) { > - if (wiz->typec_dir_delay) > - msleep_interruptible(wiz->typec_dir_delay); > - > - if (gpiod_get_value_cansleep(wiz->gpio_typec_dir)) > - regmap_field_write(wiz->typec_ln10_swap, 1); > - else > - regmap_field_write(wiz->typec_ln10_swap, 0); > + if (id == 0 && wiz->typec_dir_delay) { > + msleep_interruptible(wiz->typec_dir_delay); Why do you need to have this debounce delay if there was no GPIO to begin with. You need to move the msleep call within the next if {} block. > + > + if (wiz->gpio_typec_dir) { > + if (gpiod_get_value_cansleep(wiz->gpio_typec_dir)) > + regmap_field_write(wiz->typec_ln10_swap, 1); > + else > + regmap_field_write(wiz->typec_ln10_swap, 0); > + } else { > + /* if no typec-dir gpio was specified, and USB lines > + * are connected to Lane 0 then set LN10 SWAP bit to 1. > + */ > + u32 num_lanes = wiz->num_lanes; > + int i; > + > + for (i = 0; i < num_lanes; i++) {typec-dir-gpios: > + if ((wiz->lane_phy_type[i] == PHY_TYPE_USB3) \ > + && wiz->lane_phy_reg[i] == 0) { > + regmap_field_write(wiz->typec_ln10_swap, 1); > + } > + } > + } > } > > if (id == 0) { > @@ -1370,8 +1385,10 @@ static int wiz_get_lane_phy_types(struct device *dev, struct wiz *wiz) > dev_dbg(dev, "%s: Lanes %u-%u have phy-type %u\n", __func__, > reg, reg + num_lanes - 1, phy_type); > > - for (i = reg; i < reg + num_lanes; i++) > + for (i = reg; i < reg + num_lanes; i++) { > + wiz->lane_phy_reg[i] = reg; > wiz->lane_phy_type[i] = phy_type; > + } > } > > return 0; > @@ -1464,24 +1481,22 @@ static int wiz_probe(struct platform_device *pdev) > goto err_addr_to_resource; > } > > - if (wiz->gpio_typec_dir) { > - ret = of_property_read_u32(node, "typec-dir-debounce-ms", > - &wiz->typec_dir_delay); > - if (ret && ret != -EINVAL) { > - dev_err(dev, "Invalid typec-dir-debounce property\n"); > - goto err_addr_to_resource; > - } > + ret = of_property_read_u32(node, "typec-dir-debounce-ms", > + &wiz->typec_dir_delay); > + if (ret && ret != -EINVAL) { > + dev_err(dev, "Invalid typec-dir-debounce property\n"); > + goto err_addr_to_resource; > + } Why do you need to know this debounce value if you don't have a valid GPIO line? > > - /* use min. debounce from Type-C spec if not provided in DT */ > - if (ret == -EINVAL) > - wiz->typec_dir_delay = WIZ_TYPEC_DIR_DEBOUNCE_MIN; > + /* use min. debounce from Type-C spec if not provided in DT */ > + if (ret == -EINVAL) > + wiz->typec_dir_delay = WIZ_TYPEC_DIR_DEBOUNCE_MIN; > > - if (wiz->typec_dir_delay < WIZ_TYPEC_DIR_DEBOUNCE_MIN || > - wiz->typec_dir_delay > WIZ_TYPEC_DIR_DEBOUNCE_MAX) { > - ret = -EINVAL; > - dev_err(dev, "Invalid typec-dir-debounce property\n"); > - goto err_addr_to_resource; > - } > + if (wiz->typec_dir_delay < WIZ_TYPEC_DIR_DEBOUNCE_MIN || > + wiz->typec_dir_delay > WIZ_TYPEC_DIR_DEBOUNCE_MAX) { > + ret = -EINVAL; > + dev_err(dev, "Invalid typec-dir-debounce property\n"); > + goto err_addr_to_resource; > } All these changes are unnecessary. > > ret = wiz_get_lane_phy_types(dev, wiz); cheers, -roger