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 1E71BC54EBD for ; Sat, 7 Jan 2023 03:57:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236660AbjAGD5X (ORCPT ); Fri, 6 Jan 2023 22:57:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47630 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229488AbjAGD5T (ORCPT ); Fri, 6 Jan 2023 22:57:19 -0500 Received: from mail-pj1-x102e.google.com (mail-pj1-x102e.google.com [IPv6:2607:f8b0:4864:20::102e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3959515719 for ; Fri, 6 Jan 2023 19:57:18 -0800 (PST) Received: by mail-pj1-x102e.google.com with SMTP id h7-20020a17090aa88700b00225f3e4c992so7238651pjq.1 for ; Fri, 06 Jan 2023 19:57:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject:from:to:cc:subject:date:message-id:reply-to; bh=abJ2ZomIhN0as9i68ztngITXysLgSUcPxXPYLI3U8+s=; b=DCXhKpU9NlHNVSElxKuNTPnvhuVEKakjbEfkItV/vme60k1yHF6abIo3Jbs7klcEkh zunJ6DR3+y3BBS11cbJGjviZAnMY5kpbKM9VY2c32XDkM2o4A4imBRXDQSfock6Hgcb4 UkzdJnqNjkdN9L9iRTSigz0QoR+X15MpRxfHk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:mime-version:user-agent:date:message-id:from:references :cc:to:subject:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=abJ2ZomIhN0as9i68ztngITXysLgSUcPxXPYLI3U8+s=; b=8Gmka1WzpBxJxCK3Iw57vB9yY2xNTbs5jCprw+j1KQNSGjONQzhFVEyD89FYWBH698 YNwh+Td87XiCdZ4H/ocPru/AakwkXkhb6ppmyw1sTeGy5Ryzzy/q08hVlMLXXnLiMnXO acctAhO791hnASV7UpjJuPA/K6dL3vUVT0AY6JpMWn+lAkWaVZj7Ca43vxulsNC6iBep Sh2SOORcHwKDrxFoCT6/6zW9ihGkkgHrJFUs44hIsy/01/gLxP69A6Wy+gFB7hGnwyD+ TvdyM+m+I7PbZYw7G2f6emmXVeu0REWBGE80V8JE6grgXrWUSlR8Hnh/A/PArfQ1K0Ok k4cg== X-Gm-Message-State: AFqh2kqaF1H1HI5XgmVkP7FVQNlu2VFI5x3OLo8JToHsR2QcCPPH9dQB AdoxjkdtUBJwXBPPWITLx4pe5YGLwILgb/9pyW7WJKlXjyF5x2K08PWAGKWkorWfKExy5O0x8Fi oG3jx7iQh1XIb07FZ+srGzzfyBm56vvT5SCltSmqaBSZ5FD3Hu/XkbkCHlMvmaxMJxEIYec8QQy TLJKd9brdujws= X-Google-Smtp-Source: AMrXdXttZFJ5xTYfmgzZnOu/c9KRT1ipY26ux010mlhOvMWOUPNlMT0Q6blph3GkNOTWsI+51b3LbA== X-Received: by 2002:a17:903:31d5:b0:191:4539:d2c1 with SMTP id v21-20020a17090331d500b001914539d2c1mr57179900ple.47.1673063837270; Fri, 06 Jan 2023 19:57:17 -0800 (PST) Received: from bcacpedev-irv-3.lvn.broadcom.net ([192.19.161.250]) by smtp.gmail.com with ESMTPSA id 185-20020a6303c2000000b004702eca61fcsm1526661pgd.36.2023.01.06.19.57.15 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 06 Jan 2023 19:57:16 -0800 (PST) Subject: Re: [PATCH 14/16] spi: bcm63xx-hsspi: prepend: Disable spi mem dual io read op support To: Mark Brown Cc: Linux SPI List , Broadcom Kernel List , anand.gore@broadcom.com, tomer.yacoby@broadcom.com, dan.beygelman@broadcom.com, joel.peshkin@broadcom.com, f.fainelli@gmail.com, jonas.gorski@gmail.com, kursad.oney@broadcom.com, dregan@mail.com, linux-kernel@vger.kernel.org References: <20230106200809.330769-1-william.zhang@broadcom.com> <20230106200809.330769-15-william.zhang@broadcom.com> From: William Zhang Message-ID: <1719d289-ae1a-708e-ffd7-889007465b4e@broadcom.com> Date: Fri, 6 Jan 2023 19:57:15 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000bc6ff805f1a48779" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --000000000000bc6ff805f1a48779 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit On 01/06/2023 02:07 PM, Mark Brown wrote: > On Fri, Jan 06, 2023 at 12:08:06PM -0800, William Zhang wrote: >> In general the controller supports SPI dual mode operation but the >> particular SPI flash dual io read op switches from single mode in cmd >> phase to dual mode in address and data phase. This is not compatible >> with prepend operation where cmd and address are sent out through the >> prepend buffer and they must use same the number of io pins. >> >> This patch disables these SPI flash dual io read ops through the mem_ops >> supports_op interface when prepend mode is used. This makes sure the SPI >> flash driver selects the compatible read ops at run time. > > This suggests that your prepend mode is attempting to combine > incompatible transfers doesn't it? Presumably other devices could > generate similar access patterns... > As far as I can see, only spi mem op has such pattern but agree it is possible that other device can generate such usage. I can add a check for this condition(all the prepend data must use same io width) so error can be printed and user can switch to dummy cs workaround. Thank you for your feedbacks so far and have a nice weekend! --000000000000bc6ff805f1a48779 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQcAYJKoZIhvcNAQcCoIIQYTCCEF0CAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3HMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t rVWO/EiXfYnK7zeop26ry1RpKtogB7/O115zultAz64ydQYLe+a1e/czkALg3sgTcOOcFZTXk38e aqsXsipoX1vsNurqPtnC27TWsA7pk4uKXscFjkeUE8JZu9BDKaswZygxBOPBQBwrA5+20Wxlk6k1 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