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 D8C2AC43334 for ; Mon, 18 Jul 2022 06:02:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233399AbiGRGCL (ORCPT ); Mon, 18 Jul 2022 02:02:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60990 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231769AbiGRGCK (ORCPT ); Mon, 18 Jul 2022 02:02:10 -0400 Received: from smtp16.bhosted.nl (smtp16.bhosted.nl [IPv6:2a02:9e0:8000::27]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 40E2A1057C for ; Sun, 17 Jul 2022 23:02:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonic.nl; s=202111; h=content-transfer-encoding:content-type:mime-version:references:in-reply-to: message-id:subject:cc:to:from:date:from; bh=Kanh781UymksAyGUugmQj8P1S8W1X2YktbcM9+VR/60=; b=VBQ4pHVTdgeGeMKYSiX0Iu5QJpSgQ6fleLAfnAHPgtLKhB6ylKf7a4Eypl5nR5o6Hh/fqe5nt4Hhb O5xHTfWoAKql5HgshsyT1LPw3N5tdHAXIau2WJZh6cPfjBtzPeAcHnM4RBFZJSscnK7UZKZLe8jdfs kIiv5rTsJZAkbVX52ptH4HL/otBOH6iWZJD5IyTUz1ki5Z9FjCJlU4ZNDNfge7QKgjshBMjT6qOQ1R FFbkg28OyA+CFl3sOMsGGTn4o3SbtSNoPFtICBPVotO3sn7ehS22nwFftrUJD/hYgvwmZJYq0cF5uV HePpOLKBkcQRWjnaNKLSVdAyzIR369g== X-MSG-ID: 24694fd2-065f-11ed-9051-0050569d2c73 Date: Mon, 18 Jul 2022 08:02:01 +0200 From: David Jander To: Thomas Kopp Cc: , , , Subject: Re: [PATCH v3 00/11] Optimize spi_sync path Message-ID: <20220718080201.5799c036@erd992> In-Reply-To: <20220715141342.12330-1-thomas.kopp@microchip.com> References: <20220621061234.3626638-1-david@protonic.nl> <20220715141342.12330-1-thomas.kopp@microchip.com> Organization: Protonic Holland X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org Hi Thomas, On Fri, 15 Jul 2022 16:13:42 +0200 Thomas Kopp wrote: > Hi David, > > some numbers after testing your patch on a RPI 5.15.y vs 5.19rc6 and the > mcp2518fd: > > Two Backtoback SPI transfers with 9 byte each went from 78us to 36us! All > metrics improved (cs to first clock cyle, last clock cycle to cs, and delay > between two transfers). That's a great help for the mcp driver (or any > similar SPI device). > > Thanks for your work on this! Thanks a lot for testing and reporting! It is very encouraging to hear first reports of people confirming the gains I intended to accomplish. Best regards, -- David Jander Protonic Holland.