From patchwork Sun Feb 13 13:05:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 12744596 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9FDE8C433EF for ; Sun, 13 Feb 2022 13:05:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Cj5kzCCOlp3Vkf5xhRPGqRDufS/0f4RFzeBhadmRru0=; b=HFjvtTGB2S7e/J c5f7LbvlZqZb52SXpnQ/Pu1sxnXcLd2PcX09VYzpK0FFBdcCJF0b1qNfCLR8nRPO4+7PJfCEJGaBx HXwMfZAPO9BvKJfiPnPAcVKwwMveW1p31cosMZwsGV1LOYx3i9ua4AhX/+zPNGAwEH9LmvMaUirG2 gZW3m2Oh1F0EyjxNhOyjxZ3CF+svLU2N0smZFZMaG3rkkmeKUglXaVy8+gSp+Vwsf9uaL8gR7UQ5P 1RJDbChv77ip+4SNSckI0BzWAW8K/vV0jJ2wE4BJBjEqN+JLrR/0mJMlKZ8GfSn1ofDQSuPB0kLNR noBeAif9uLSDgRud0EoA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJEZd-00Biol-3a; Sun, 13 Feb 2022 13:05:53 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nJEZa-00BimV-5c for linux-phy@lists.infradead.org; Sun, 13 Feb 2022 13:05:51 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1644757549; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MdaT+Ez5YT/CHAs9bbKyNuiCjdqbvspAYl8e3zW7vf0=; b=cqh7/tW28WGfWS1Pz+CIhJyeV2pWDozPgZi8052HsjP7TVWDh28ZKMlP+2WqHnE+HiUR/V Lt2NLDEC5c1p2UOeznQifSiOwJezK08/REM+XwzRv0CNzCYUzzyRY9M3Ea1kmcu5SXNlkV 2Jpb+3jwRrXpTEmJLY/iirBxYo8OKJQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-244-GoDPmHT8O1uZxfp7lql-kg-1; Sun, 13 Feb 2022 08:05:45 -0500 X-MC-Unique: GoDPmHT8O1uZxfp7lql-kg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A354A1091DA1; Sun, 13 Feb 2022 13:05:44 +0000 (UTC) Received: from shalem.redhat.com (unknown [10.39.192.92]) by smtp.corp.redhat.com (Postfix) with ESMTP id 150A47B9F7; Sun, 13 Feb 2022 13:05:42 +0000 (UTC) From: Hans de Goede To: Felipe Balbi , Greg Kroah-Hartman , Kishon Vijay Abraham I , Vinod Koul Cc: Hans de Goede , Stephan Gerhold , linux-usb@vger.kernel.org, linux-phy@lists.infradead.org Subject: [PATCH v2 6/9] phy: ti: tusb1210: Improve ulpi_read()/_write() error checking Date: Sun, 13 Feb 2022 14:05:21 +0100 Message-Id: <20220213130524.18748-7-hdegoede@redhat.com> In-Reply-To: <20220213130524.18748-1-hdegoede@redhat.com> References: <20220213130524.18748-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220213_050550_374501_B405105F X-CRM114-Status: GOOD ( 16.34 ) X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org ulpi_read() and ulpi_write() calls can fail. Add wrapper functions to log errors when this happens and add error checking to the read + write of the phy parameters from the TUSB1210_VENDOR_SPECIFIC2 register. Signed-off-by: Hans de Goede --- drivers/phy/ti/phy-tusb1210.c | 62 +++++++++++++++++++++++++++-------- 1 file changed, 48 insertions(+), 14 deletions(-) diff --git a/drivers/phy/ti/phy-tusb1210.c b/drivers/phy/ti/phy-tusb1210.c index 15c1c79e5c29..bf7793afdc84 100644 --- a/drivers/phy/ti/phy-tusb1210.c +++ b/drivers/phy/ti/phy-tusb1210.c @@ -26,6 +26,33 @@ struct tusb1210 { u8 vendor_specific2; }; +static int tusb1210_ulpi_write(struct tusb1210 *tusb, u8 reg, u8 val) +{ + int ret; + + ret = ulpi_write(tusb->ulpi, reg, val); + if (ret) + dev_err(&tusb->ulpi->dev, "error %d writing val 0x%02x to reg 0x%02x\n", + ret, val, reg); + + return ret; +} + +static int tusb1210_ulpi_read(struct tusb1210 *tusb, u8 reg, u8 *val) +{ + int ret; + + ret = ulpi_read(tusb->ulpi, reg); + if (ret >= 0) { + *val = ret; + ret = 0; + } else { + dev_err(&tusb->ulpi->dev, "error %d reading reg 0x%02x\n", ret, reg); + } + + return ret; +} + static int tusb1210_power_on(struct phy *phy) { struct tusb1210 *tusb = phy_get_drvdata(phy); @@ -35,8 +62,8 @@ static int tusb1210_power_on(struct phy *phy) /* Restore the optional eye diagram optimization value */ if (tusb->vendor_specific2) - ulpi_write(tusb->ulpi, TUSB1210_VENDOR_SPECIFIC2, - tusb->vendor_specific2); + return tusb1210_ulpi_write(tusb, TUSB1210_VENDOR_SPECIFIC2, + tusb->vendor_specific2); return 0; } @@ -55,33 +82,34 @@ static int tusb1210_set_mode(struct phy *phy, enum phy_mode mode, int submode) { struct tusb1210 *tusb = phy_get_drvdata(phy); int ret; + u8 reg; - ret = ulpi_read(tusb->ulpi, ULPI_OTG_CTRL); + ret = tusb1210_ulpi_read(tusb, ULPI_OTG_CTRL, ®); if (ret < 0) return ret; switch (mode) { case PHY_MODE_USB_HOST: - ret |= (ULPI_OTG_CTRL_DRVVBUS_EXT + reg |= (ULPI_OTG_CTRL_DRVVBUS_EXT | ULPI_OTG_CTRL_ID_PULLUP | ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN); - ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret); - ret |= ULPI_OTG_CTRL_DRVVBUS; + tusb1210_ulpi_write(tusb, ULPI_OTG_CTRL, reg); + reg |= ULPI_OTG_CTRL_DRVVBUS; break; case PHY_MODE_USB_DEVICE: - ret &= ~(ULPI_OTG_CTRL_DRVVBUS + reg &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DP_PULLDOWN | ULPI_OTG_CTRL_DM_PULLDOWN); - ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret); - ret &= ~ULPI_OTG_CTRL_DRVVBUS_EXT; + tusb1210_ulpi_write(tusb, ULPI_OTG_CTRL, reg); + reg &= ~ULPI_OTG_CTRL_DRVVBUS_EXT; break; default: /* nothing */ return 0; } - return ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret); + return tusb1210_ulpi_write(tusb, ULPI_OTG_CTRL, reg); } static const struct phy_ops phy_ops = { @@ -95,11 +123,14 @@ static int tusb1210_probe(struct ulpi *ulpi) { struct tusb1210 *tusb; u8 val, reg; + int ret; tusb = devm_kzalloc(&ulpi->dev, sizeof(*tusb), GFP_KERNEL); if (!tusb) return -ENOMEM; + tusb->ulpi = ulpi; + tusb->gpio_reset = devm_gpiod_get_optional(&ulpi->dev, "reset", GPIOD_OUT_LOW); if (IS_ERR(tusb->gpio_reset)) @@ -119,7 +150,9 @@ static int tusb1210_probe(struct ulpi *ulpi) * diagram optimization and DP/DM swap. */ - reg = ulpi_read(ulpi, TUSB1210_VENDOR_SPECIFIC2); + ret = tusb1210_ulpi_read(tusb, TUSB1210_VENDOR_SPECIFIC2, ®); + if (ret) + return ret; /* High speed output drive strength configuration */ if (!device_property_read_u8(&ulpi->dev, "ihstx", &val)) @@ -133,15 +166,16 @@ static int tusb1210_probe(struct ulpi *ulpi) if (!device_property_read_u8(&ulpi->dev, "datapolarity", &val)) u8p_replace_bits(®, val, (u8)TUSB1210_VENDOR_SPECIFIC2_DP_MASK); - ulpi_write(ulpi, TUSB1210_VENDOR_SPECIFIC2, reg); + ret = tusb1210_ulpi_write(tusb, TUSB1210_VENDOR_SPECIFIC2, reg); + if (ret) + return ret; + tusb->vendor_specific2 = reg; tusb->phy = ulpi_phy_create(ulpi, &phy_ops); if (IS_ERR(tusb->phy)) return PTR_ERR(tusb->phy); - tusb->ulpi = ulpi; - phy_set_drvdata(tusb->phy, tusb); ulpi_set_drvdata(ulpi, tusb); return 0;