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 X-Spam-Level: X-Spam-Status: No, score=-3.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0EDC1C4363A for ; Mon, 26 Oct 2020 15:13:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C04812222C for ; Mon, 26 Oct 2020 15:13:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="gBCS24lS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1783412AbgJZPNe (ORCPT ); Mon, 26 Oct 2020 11:13:34 -0400 Received: from mail-lj1-f196.google.com ([209.85.208.196]:41786 "EHLO mail-lj1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1783371AbgJZPNd (ORCPT ); Mon, 26 Oct 2020 11:13:33 -0400 Received: by mail-lj1-f196.google.com with SMTP id p15so10563894ljj.8 for ; Mon, 26 Oct 2020 08:13:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=cdcmcT3iFK7ddXDqu6bi0MBtBrx6YHZ6ktIv7ngsAQc=; b=gBCS24lSJAQgEYqL3fz2ktJ/SlrcN1QxgtfA6/eU72MKsVPW5AnhiLmrp7rYtS7heO qN/RbY9xSr5WwgfFpQ0drM2azVCCdHUmIi+9AMZ9Ub4nt89wV5ejS7gAGygdQRrP2q5g Zzr9sVmRScvWrhUfMFsfcuiRmqPegjnOGPTzM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=cdcmcT3iFK7ddXDqu6bi0MBtBrx6YHZ6ktIv7ngsAQc=; b=WIJqwgUnWumZXGiOmjYUhMBe9EDut/+b6Zf6bZII7CKdee3K/j5N72r5sZAuv7UZIt C0VgIpVSRaNRn1lE3sfDXmWRS1pv2PlKnUiH8lEoLJhVCZZWsMZNIeqHT2/raM9j+frj jn1W5S0cihNkosl2DuJ9ribFVfTuyY/uCLyX1hKypVT+OcACh9vf0Hzop6mdsFNO/P55 MbavF3qojpZJiWIfngaTnEBQ5CeQY4a+PUKLDZ2kHn/KmZpIXv9dP/LgC2+F+wv0Ikkt UgOqdoAcdt1ZO/NFgmSjcwuc+gVp8yxUZpECVaHDX0hYxjPUrSW1kRJlty/BEPYvw1bf 5F5Q== X-Gm-Message-State: AOAM5321qk3PXDRKf+ByIw9t3lB5vLoWzFxXnPcNwf2IYAcIVW5ncMQS 9vSDSEplAPhZM0zlHUp8+/tm71GpmstOLcy49g40Eg== X-Google-Smtp-Source: ABdhPJw54oMIdnl9vOHiG1OEJIWO1gTLhLL8nSGyz80aFrNrjsxp0x9bxGNEs/AhBARq9eWQ7ZOaUQFwJ++I1qvwNAQ= X-Received: by 2002:a2e:9a46:: with SMTP id k6mr6565907ljj.310.1603725209206; Mon, 26 Oct 2020 08:13:29 -0700 (PDT) MIME-Version: 1.0 References: <20201011182254.17776-7-rayagonda.kokatanur@broadcom.com> In-Reply-To: From: Rayagonda Kokatanur Date: Mon, 26 Oct 2020 20:43:17 +0530 Message-ID: Subject: Re: [PATCH v1 6/6] i2c: iproc: handle rx fifo full interrupt To: Dhananjay Phadke Cc: Andy Shevchenko , BCM Kernel Feedback , Brendan Higgins , Florian Fainelli , linux-arm Mailing List , linux-i2c , Linux Kernel Mailing List , Lori Hikichi , Ray Jui , Scott Branden , Wolfram Sang , Ray Jui Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000007a6a5305b2945f3e" Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org --0000000000007a6a5305b2945f3e Content-Type: text/plain; charset="UTF-8" Hi Dhanajay, On Fri, Oct 23, 2020 at 11:12 PM Ray Jui wrote: > > > > On 10/12/2020 3:03 PM, Dhananjay Phadke wrote: > > From: Rayagonda Kokatanur > > > > On Sun, 11 Oct 2020 23:52:54 +0530, Rayagonda Kokatanur wrote: > >> Add code to handle IS_S_RX_FIFO_FULL_SHIFT interrupt to support > >> master write request with >= 64 bytes. > >> > >> Iproc has a slave rx fifo size of 64 bytes. > >> Rx fifo full interrupt (IS_S_RX_FIFO_FULL_SHIFT) will be generated > >> when RX fifo becomes full. This can happen if master issues write > >> request of more than 64 bytes. > >> > > > > ARM cores run much faster than I2C bus, why would rx fifo go full when > > rx interrupt is enabled and bytes are read out by bus driver isr? > > Isn't fifo read pointer updated on these byte reads? > > Hi Rayagonda, > > Could you please reply on this question? For transactions > 64 bytes, do > we batch until RX FIFO is full before we read out the data? Sorry I missed this question. Yes with current design we are batching 64 bytes for translation > 64 bytes. Best regards, Rayagonda > > Thanks, > > Ray > > > Does controller stretch clock when rx fifo is full (e.g. kernel has > > crashed, bus driver isn't draining fifo)? > > --0000000000007a6a5305b2945f3e Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQVwYJKoZIhvcNAQcCoIIQSDCCEEQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg2sMIIE6DCCA9CgAwIBAgIOSBtqCRO9gCTKXSLwFPMwDQYJKoZIhvcNAQELBQAwTDEgMB4GA1UE CxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjMxEzARBgNVBAoTCkdsb2JhbFNpZ24xEzARBgNVBAMT Ckdsb2JhbFNpZ24wHhcNMTYwNjE1MDAwMDAwWhcNMjQwNjE1MDAwMDAwWjBdMQswCQYDVQQGEwJC RTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTEzMDEGA1UEAxMqR2xvYmFsU2lnbiBQZXJzb25h bFNpZ24gMiBDQSAtIFNIQTI1NiAtIEczMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA tpZok2X9LAHsYqMNVL+Ly6RDkaKar7GD8rVtb9nw6tzPFnvXGeOEA4X5xh9wjx9sScVpGR5wkTg1 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