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 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 DDA52CD37B4 for ; Tue, 19 Sep 2023 03:48:31 +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-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:From:References:CC:To:Subject: MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=L3DjCcUE0p84RJ1ytpfXf+vkjX1XHEvQX69wqSmH/GA=; b=xFSNUoDUoFquaJ iZmECfqTZqkA0LBK4mrPrRSBK0zDODsV5Iwnz7nijQX58mawsh6ECItz/S7j7XtovtwH+LgD4enKd Yat4HpmHh7hTu2DyDUCaSmHzF5779FSZ4Gb1e++hH96pC5a5L7MzePA4Vj/xQeIKUybmJj0Xa95wF Z053G+94eWkw+TNeQOO3HFFhpoBozjYaQnFCK9LYc/zpkajkcfo66f93Hdt9HmlCWbNKiS5fc2NiO 7SN0zmlpUxdaIRiFERAVqjzB/BBuIhtoGLXI43FNjmDz+SLfj4Ze+rUXqDOEjINwJ8t2c9yDeTrLp +/CmBu9KKuf3k95eV8+g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qiRiZ-00Gq1W-2x; Tue, 19 Sep 2023 03:48:07 +0000 Received: from lelv0143.ext.ti.com ([198.47.23.248]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qiRiW-00Gq15-1I for linux-arm-kernel@lists.infradead.org; Tue, 19 Sep 2023 03:48:06 +0000 Received: from fllv0034.itg.ti.com ([10.64.40.246]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id 38J3lvxM015983; Mon, 18 Sep 2023 22:47:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1695095277; bh=xvr6P2c6usmltqifh7a8DUkpaYOsPQxUxw0KAi+r1dc=; h=Date:Subject:To:CC:References:From:In-Reply-To; b=RmokO0H4RF0JsQvIoxOd9Fate1e4N8LqdNUktceiACa2pcaHR6fPyD+Rv84awk5Gt fZyFYZRJm2/U5d96bfoBsQK0P/46CNrAkqvmHv5bQmsJxbKMMDt1gkFmhhDjt3c/4h 6ObrENLy8h3rYsQwdQfmz71wmijy9Wx1WJFhs86A= Received: from DLEE115.ent.ti.com (dlee115.ent.ti.com [157.170.170.26]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 38J3lvpk077989 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 18 Sep 2023 22:47:57 -0500 Received: from DLEE113.ent.ti.com (157.170.170.24) by DLEE115.ent.ti.com (157.170.170.26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Mon, 18 Sep 2023 22:47:56 -0500 Received: from fllv0039.itg.ti.com (10.64.41.19) by DLEE113.ent.ti.com (157.170.170.24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23 via Frontend Transport; Mon, 18 Sep 2023 22:47:56 -0500 Received: from [10.24.68.114] (ileaxei01-snat.itg.ti.com [10.180.69.5]) by fllv0039.itg.ti.com (8.15.2/8.15.2) with ESMTP id 38J3lsYC045476; Mon, 18 Sep 2023 22:47:55 -0500 Message-ID: <5ceb9aad-dce9-c044-019d-6e8ed1500246@ti.com> Date: Tue, 19 Sep 2023 09:17:53 +0530 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: Re: [PATCH v2 1/2] soc: ti: k3-socinfo: Revamp driver to accommodate different rev structs To: Nishanth Menon CC: , , , , References: <20230915064650.2287638-1-n-francis@ti.com> <20230915064650.2287638-2-n-francis@ti.com> <20230915122127.f4cogffx4sc3towe@uncork> Content-Language: en-US From: Neha Malcom Francis In-Reply-To: <20230915122127.f4cogffx4sc3towe@uncork> X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230918_204804_609996_4FEBED05 X-CRM114-Status: GOOD ( 32.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Nishanth On 15/09/23 17:51, Nishanth Menon wrote: > On 12:16-20230915, Neha Malcom Francis wrote: >> k3-socinfo.c driver assumes silicon revisions to be 1.0, 2.0 etc. for >> every platform. However this typical style is not followed by J721E >> (1.0, 1.1) and need not be followed by upcoming silicon revisions as >> well. Adapt the driver to be similar to its U-Boot counterpart >> (drivers/soc/soc_ti_k3.c) that accounts for this difference on the >> basis of partno/family. >> >> Note that we change the order of invocation of >> k3_chipinfo_partno_to_names before k3_chipinfo_variant_to_sr so we >> have the family name in case error is returned. > > Drop reference to U-boot and others. How about this: > > The driver assumes that the silicon revisions for every platform are > incremental and one-to-one, corresponding to JTAG_ID's variant field: > 1.0, 2.0, and so on. This assumption is wrong for SoCs such as J721E, > where the variant field to revision mapping is 1,0, 1.1. Further, > there are SoCs such as AM65x where the sub-variant version requires > custom decoding of other registers. > > Address this by using conditional handling per JTAG ID that requires > an exception with J721E as the first example. To facilitate this > conversion, use macros to identify the JTAG_ID part number and map them > to predefined string array. > >> >> Signed-off-by: Thejasvi Konduru > > Maintain original From or drop this or use Co-developed-by as applicable? > >> Signed-off-by: Neha Malcom Francis >> --- >> drivers/soc/ti/k3-socinfo.c | 71 +++++++++++++++++++++++++++++-------- >> 1 file changed, 56 insertions(+), 15 deletions(-) >> >> diff --git a/drivers/soc/ti/k3-socinfo.c b/drivers/soc/ti/k3-socinfo.c >> index 6ea9b8c7d335..6de1e3531af9 100644 >> --- a/drivers/soc/ti/k3-socinfo.c >> +++ b/drivers/soc/ti/k3-socinfo.c >> @@ -33,19 +33,37 @@ >> >> #define CTRLMMR_WKUP_JTAGID_MFG_TI 0x17 >> >> +#define JTAG_ID_PARTNO_AM65X 0xBB5A >> +#define JTAG_ID_PARTNO_J721E 0xBB64 >> +#define JTAG_ID_PARTNO_J7200 0xBB6D >> +#define JTAG_ID_PARTNO_AM64X 0xBB38 >> +#define JTAG_ID_PARTNO_J721S2 0xBB75 >> +#define JTAG_ID_PARTNO_AM62X 0xBB7E >> +#define JTAG_ID_PARTNO_J784S4 0xBB80 >> +#define JTAG_ID_PARTNO_AM62AX 0xBB8D >> +#define JTAG_ID_PARTNO_AM62PX 0xBB9D >> + >> static const struct k3_soc_id { >> unsigned int id; >> const char *family_name; >> } k3_soc_ids[] = { >> - { 0xBB5A, "AM65X" }, >> - { 0xBB64, "J721E" }, >> - { 0xBB6D, "J7200" }, >> - { 0xBB38, "AM64X" }, >> - { 0xBB75, "J721S2"}, >> - { 0xBB7E, "AM62X" }, >> - { 0xBB80, "J784S4" }, >> - { 0xBB8D, "AM62AX" }, >> - { 0xBB9D, "AM62PX" }, >> + { JTAG_ID_PARTNO_AM65X, "AM65X" }, >> + { JTAG_ID_PARTNO_J721E, "J721E" }, >> + { JTAG_ID_PARTNO_J7200, "J7200" }, >> + { JTAG_ID_PARTNO_AM64X, "AM64X" }, >> + { JTAG_ID_PARTNO_J721S2, "J721S2"}, >> + { JTAG_ID_PARTNO_AM62X, "AM62X" }, >> + { JTAG_ID_PARTNO_J784S4, "J784S4" }, >> + { JTAG_ID_PARTNO_AM62AX, "AM62AX" }, >> + { JTAG_ID_PARTNO_AM62PX, "AM62PX" }, >> +}; >> + >> +static char *j721e_rev_string_map[] = { > > static const? > >> + "1.0", "1.1", >> +}; >> + >> +static char *k3_rev_string_map[] = { > > We can drop this (See below) > >> + "1.0", "2.0", "3.0", >> }; >> >> static int >> @@ -63,6 +81,29 @@ k3_chipinfo_partno_to_names(unsigned int partno, >> return -EINVAL; >> } >> >> +static int >> +k3_chipinfo_variant_to_sr(unsigned int partno, unsigned int variant, >> + struct soc_device_attribute *soc_dev_attr) >> +{ >> + switch (partno) { >> + case JTAG_ID_PARTNO_J721E: >> + if (variant >= ARRAY_SIZE(j721e_rev_string_map)) >> + goto bail; >> + soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%s", >> + j721e_rev_string_map[variant]); >> + break; >> + default: >> + if (variant >= ARRAY_SIZE(k3_rev_string_map)) >> + goto bail; >> + soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%s", >> + k3_rev_string_map[variant]); > > How about retaining the old logic as is? > > soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant); > >> + } > > what if !soc_dev_attr->revision error handling? > >> + return 0; >> + >> +bail: > > Rename to something like err_unknown_variant ? > >> + return -EINVAL; > return -ENODEV instead to help distinguish between not having memory Vs > not finding a match? > >> +} >> + >> static int k3_chipinfo_probe(struct platform_device *pdev) >> { >> struct device_node *node = pdev->dev.of_node; >> @@ -94,7 +135,6 @@ static int k3_chipinfo_probe(struct platform_device *pdev) >> >> variant = (jtag_id & CTRLMMR_WKUP_JTAGID_VARIANT_MASK) >> >> CTRLMMR_WKUP_JTAGID_VARIANT_SHIFT; >> - variant++; >> >> partno_id = (jtag_id & CTRLMMR_WKUP_JTAGID_PARTNO_MASK) >> >> CTRLMMR_WKUP_JTAGID_PARTNO_SHIFT; >> @@ -103,15 +143,16 @@ static int k3_chipinfo_probe(struct platform_device *pdev) >> if (!soc_dev_attr) >> return -ENOMEM; >> >> - soc_dev_attr->revision = kasprintf(GFP_KERNEL, "SR%x.0", variant); >> - if (!soc_dev_attr->revision) { >> - ret = -ENOMEM; >> + ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr); >> + if (ret) { >> + dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id); > > Might be worthwhile to print the errno to distinguish between no mem > fail vs nodev match fail. - see below for k3_chipinfo_partno_to_names > >> + ret = -ENODEV; > > don't over-ride the return value - that is probably a preceding cleanup patch > for k3_chipinfo_partno_to_names - also to distinguish between -ENOMEM vs > -ENODEV. > >> goto err; >> } >> >> - ret = k3_chipinfo_partno_to_names(partno_id, soc_dev_attr); >> + ret = k3_chipinfo_variant_to_sr(partno_id, variant, soc_dev_attr); >> if (ret) { >> - dev_err(dev, "Unknown SoC JTAGID[0x%08X]\n", jtag_id); >> + dev_err(dev, "Unknown revision for %s\n", soc_dev_attr->family); >> ret = -ENODEV; >> goto err_free_rev; >> } >> -- >> 2.34.1 >> > Thanks for the detailed review! I will work on it and send v3. -- Thanking You Neha Malcom Francis _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel