From patchwork Wed Sep 28 14:48:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Zaidman X-Patchwork-Id: 610709 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 06A3DC32771 for ; Wed, 28 Sep 2022 14:50:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234066AbiI1Ouh (ORCPT ); Wed, 28 Sep 2022 10:50:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44442 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234530AbiI1OuN (ORCPT ); Wed, 28 Sep 2022 10:50:13 -0400 Received: from mail-wr1-x435.google.com (mail-wr1-x435.google.com [IPv6:2a00:1450:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EE63F97D7A; Wed, 28 Sep 2022 07:50:06 -0700 (PDT) Received: by mail-wr1-x435.google.com with SMTP id r7so20219560wrm.2; Wed, 28 Sep 2022 07:50:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date; bh=VjzbsqyM1APsENn4Ek+I+pGVYJYx6nNdMM0neoVN9ZM=; b=WPIKMykDY++bP0uYimAivAUijxifE++Ikj0sAqcd8xClKlDR0ADDj1xR1PwMHeurXm cByqoA81MLdYsGmJ2rRu++dHE9ar+aawGjM5pOXwnfAmfmzeqiBTmHZajOKh/KyqaIxJ IktEmBWX9kkD0p6aDYWk+iDbiEBSCsHL6xy/tqsjGZiGdVpMX2R1SdEN/toF/UtqUu3G jbKObuVK5SdmEFiXENC6dl7+XLvuv+VILRgG0+vIw/Jnvk0n+wo8ghgYtA/5EzleuwDT Ix+v2sKKuhsTUWbaPHsuophz6Rwxsnd8jqqwVirbHiUK2GjrhPlXeMXSA/+1VxubkT3G Bz+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date; bh=VjzbsqyM1APsENn4Ek+I+pGVYJYx6nNdMM0neoVN9ZM=; b=pD+hjvAVNXQDZru3s157pmIgCUzQOIyJ1ud/3cfKtIEhM0zfcdDEUsis2YIy+n3hmR XJjY8lDQ936jYRWdl7G6LpmEOhdQcfHL08jZLG9hml953jFy99ML65h8a7AwvA6QXExG f/Wf4BeFbvHa1ThP8JRpBlYeE/Gl+N4JRaCMc6UOS8DBfxqpUIHxNEokT9iAnzevRdr4 ctZ3HwkIsvpK0YHZVlEu6ZaXxUSQvT6Iifigc58+wtIsoS2rjG7WtU5f1DdQ2liCSYQx GRPhlN8ktch4FxUfkzif/rOJm8Q9mpbjC5xiF2arHCsTtRR2Fz4gHuPYUaSeaVOESNbk HcTA== X-Gm-Message-State: ACrzQf3/BDdU/tpGZKyraxJCjFx3YBboKr8hTMJWXO8FOtQhzkW5+LRy m2Uxq5XEPvTSMydb2S7fY1c= X-Google-Smtp-Source: AMsMyM5crwY2/LlXIa0Qudznuc7W2yW1rFQ1trCeM3LK1Uz5y7JltsJcBpgciPxzBrOXDk3XBnFBIQ== X-Received: by 2002:a05:6000:1864:b0:22a:e349:f031 with SMTP id d4-20020a056000186400b0022ae349f031mr21202406wri.476.1664376604914; Wed, 28 Sep 2022 07:50:04 -0700 (PDT) Received: from michael-VirtualBox.xsight.ent (89-139-44-91.bb.netvision.net.il. [89.139.44.91]) by smtp.googlemail.com with ESMTPSA id m35-20020a05600c3b2300b003b47b913901sm6977446wms.1.2022.09.28.07.50.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Sep 2022 07:50:04 -0700 (PDT) From: Michael Zaidman To: jikos@kernel.org Cc: linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, Michael Zaidman , Guillaume Champagne Subject: [PATCH v2 5/7] HID: ft260: improve i2c large reads performance Date: Wed, 28 Sep 2022 17:48:52 +0300 Message-Id: <20220928144854.5580-6-michael.zaidman@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220928144854.5580-1-michael.zaidman@gmail.com> References: <20220928144854.5580-1-michael.zaidman@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org The patch increases the read buffer size to 128 bytes. It reduces the number of ft260_i2c_read calls by three and improves the large data chunks' read performance by about 10%. Before: $ sudo ./i2cperf -d 2 -o 2 -s 128 -r 0-0xff 13 0x51 -S Read block via i2ctransfer by chunks ------------------------------------------------------------------- data rate(bps) efficiency(%) data size(B) total IOs IO size(B) ------------------------------------------------------------------- 43990 85 256 2 128 Kernel log: [ +1.464346] ft260_i2c_write_read: off 0x0 rlen 128 wlen 2 [ +0.000002] ft260_i2c_write: rep 0xd0 addr 0x51 off 0 len 2 wlen 2 flag 0x2 d[0] 0x0 [ +0.001653] ft260_xfer_status: bus_status 0x41, clock 100 [ +0.000188] ft260_xfer_status: bus_status 0x40, clock 100 [ +0.000002] ft260_i2c_read: rep 0xc2 addr 0x51 len 128 rlen 60 flag 0x3 [ +0.008609] ft260_raw_event: i2c resp: rep 0xde len 60 [ +0.000157] ft260_xfer_status: bus_status 0x40, clock 100 [ +0.000002] ft260_i2c_read: rep 0xc2 addr 0x51 len 68 rlen 60 flag 0x0 [ +0.008840] ft260_raw_event: i2c resp: rep 0xde len 60 [ +0.000203] ft260_xfer_status: bus_status 0x40, clock 100 [ +0.000002] ft260_i2c_read: rep 0xc2 addr 0x51 len 8 rlen 8 flag 0x4 [ +0.002794] ft260_raw_event: i2c resp: rep 0xd1 len 8 [ +0.000201] ft260_xfer_status: bus_status 0x20, clock 100 [ +0.015171] ft260_i2c_write_read: off 0x80 rlen 128 wlen 2 [ +0.000002] ft260_i2c_write: rep 0xd0 addr 0x51 off 0 len 2 wlen 2 flag 0x2 d[0] 0x0 [ +0.000764] ft260_xfer_status: bus_status 0x41, clock 100 [ +0.000231] ft260_xfer_status: bus_status 0x41, clock 100 [ +0.000148] ft260_xfer_status: bus_status 0x40, clock 100 [ +0.000002] ft260_i2c_read: rep 0xc2 addr 0x51 len 128 rlen 60 flag 0x3 [ +0.008488] ft260_raw_event: i2c resp: rep 0xde len 60 [ +0.000205] ft260_xfer_status: bus_status 0x40, clock 100 [ +0.000002] ft260_i2c_read: rep 0xc2 addr 0x51 len 68 rlen 60 flag 0x0 [ +0.008795] ft260_raw_event: i2c resp: rep 0xde len 60 [ +0.000176] ft260_xfer_status: bus_status 0x40, clock 100 [ +0.000001] ft260_i2c_read: rep 0xc2 addr 0x51 len 8 rlen 8 flag 0x4 [ +0.002819] ft260_raw_event: i2c resp: rep 0xd1 len 8 [ +0.000167] ft260_xfer_status: bus_status 0x20, clock 100 After: $ sudo ./i2cperf -d 2 -o 2 -s 128 -r 0-0xff 13 0x51 -S Read block via i2ctransfer by chunks ------------------------------------------------------------------- data rate(bps) efficiency(%) data size(B) total IOs IO size(B) ------------------------------------------------------------------- 49316 85 256 2 128 Kernel log: [ +1.447360] ft260_i2c_write_read: off 0x0 rlen 128 wlen 2 [ +0.000002] ft260_i2c_write: rep 0xd0 addr 0x51 off 0 len 2 wlen 2 flag 0x2 d[0] 0x0 [ +0.001633] ft260_xfer_status: bus_status 0x41, clock 100 [ +0.000190] ft260_xfer_status: bus_status 0x40, clock 100 [ +0.000001] ft260_i2c_read: rep 0xc2 addr 0x51 len 128 rlen 128 flag 0x7 [ +0.008617] ft260_raw_event: i2c resp: rep 0xde len 60 [ +0.008033] ft260_raw_event: i2c resp: rep 0xde len 60 [ +0.000954] ft260_raw_event: i2c resp: rep 0xd1 len 8 [ +0.000208] ft260_xfer_status: bus_status 0x20, clock 100 [ +0.015853] ft260_i2c_write_read: off 0x80 rlen 128 wlen 2 [ +0.000002] ft260_i2c_write: rep 0xd0 addr 0x51 off 0 len 2 wlen 2 flag 0x2 d[0] 0x0 [ +0.001182] ft260_xfer_status: bus_status 0x41, clock 100 [ +0.000180] ft260_xfer_status: bus_status 0x40, clock 100 [ +0.000001] ft260_i2c_read: rep 0xc2 addr 0x51 len 128 rlen 128 flag 0x7 [ +0.008575] ft260_raw_event: i2c resp: rep 0xde len 60 [ +0.008014] ft260_raw_event: i2c resp: rep 0xde len 60 [ +0.001001] ft260_raw_event: i2c resp: rep 0xd1 len 8 [ +0.000223] ft260_xfer_status: bus_status 0x20, clock 100 Signed-off-by: Michael Zaidman Tested-by: Guillaume Champagne --- drivers/hid/hid-ft260.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/drivers/hid/hid-ft260.c b/drivers/hid/hid-ft260.c index cb8f1782d1f0..c7c3a9d395a2 100644 --- a/drivers/hid/hid-ft260.c +++ b/drivers/hid/hid-ft260.c @@ -30,12 +30,8 @@ MODULE_PARM_DESC(debug, "Toggle FT260 debugging messages"); #define FT260_REPORT_MAX_LENGTH (64) #define FT260_I2C_DATA_REPORT_ID(len) (FT260_I2C_REPORT_MIN + (len - 1) / 4) -/* - * The input report format assigns 62 bytes for the data payload, but ft260 - * returns 60 and 2 in two separate transactions. To minimize transfer time - * in reading chunks mode, set the maximum read payload length to 60 bytes. - */ -#define FT260_RD_DATA_MAX (60) + +#define FT260_RD_DATA_MAX (128) #define FT260_WR_DATA_MAX (60) /*