From patchwork Sun Dec 12 12:53:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dario Binacchi X-Patchwork-Id: 523433 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 D3BB0C433F5 for ; Sun, 12 Dec 2021 12:55:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230472AbhLLMzD (ORCPT ); Sun, 12 Dec 2021 07:55:03 -0500 Received: from smtp-34-i2.italiaonline.it ([213.209.12.34]:37160 "EHLO libero.it" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S229997AbhLLMzC (ORCPT ); Sun, 12 Dec 2021 07:55:02 -0500 Received: from passgat-Modern-14-A10M.homenet.telecomitalia.it ([82.50.51.121]) by smtp-34.iol.local with ESMTPA id wOMammqwPUpmcwOMcmGyK7; Sun, 12 Dec 2021 13:54:02 +0100 x-libjamoibt: 1601 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=libero.it; s=s2021; t=1639313642; bh=XB3UsxbeGSGlitHS0T7zXuAeheulVRHT3ylsFJWY7RA=; h=From; b=ZwtshlG9C0YZNYSxyOlodJ7wBNMvdpVxpX0Q/X6wq6QhBQZKXOcHUHLiq1RoVa7Of 7gNXIu80nhElOTMM3p62BbFTgNkS1EVYh9o5366SbyFsiq2LbQiGLXcGoGZsBhZ6yR k5Po007Lmep19FDkT3ORMHxFxDkFGSoVLD0pbgd56R25QePqJKv2K5pTGXGLdqCU+U AqQF8yjLoc7slsrPNSHqj0EwnHyHVo8Ik6TV346lNFbVYfhlWxV6b7zxTE6T19Fpn4 jNC52XpxuX/WuhoFCKUnpfyCu20FVcsiduJa8aBJxMfm+ghJk2J3HGIhrwUD4uW032 p7KQKDcsP3G9Q== X-CNFS-Analysis: v=2.4 cv=VsDmv86n c=1 sm=1 tr=0 ts=61b5f0ea cx=a_exe a=xtCFBUu/Ze6RtP+zVSd77w==:117 a=xtCFBUu/Ze6RtP+zVSd77w==:17 a=VZkyjkMPts0tdjHXfkQA:9 From: Dario Binacchi To: linux-kernel@vger.kernel.org Cc: "Andrew F . Davis" , Felipe Balbi , Rachna Patil , Wolfram Sang , Dmitry Torokhov , linux-input@vger.kernel.org, Jeff Lance , Zubair Lutfullah , Vignesh R , Dave Gerlach , Sebastian Andrzej Siewior , Grygorii Strashko , Brad Griffis , Dario Binacchi Subject: [RESEND PATCH 3/3] input: ti_am335x_tsc: lower the X and Y sampling time Date: Sun, 12 Dec 2021 13:53:58 +0100 Message-Id: <20211212125358.14416-4-dariobin@libero.it> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211212125358.14416-1-dariobin@libero.it> References: <20211212125358.14416-1-dariobin@libero.it> X-CMAE-Envelope: MS4xfCr2tNHPJS5M42ZQsU6d1R66UV4G0n0glQqdeKDjfAiyeLTueeEPu2fSFu5P77D/aBTX8p44qql16w5nDlGsxoeoG5IUD4BWbixP9BIYI6DywAO78p4m 9RifdIxgOv44xlkDzDu7JKcfVb7jU6d0TEDqGAGyVZr8z4YmGH9hZGCQrYNEwUA0txz76AEg19uczYTu9II3AZiNiYuMqlfRDszrHVC1sSDdVj7jqOZJqNxj J+6uVhJdEBiX0m26d+No8aHmOcbleXa1jW9q+GabG2FA2N+iIth3SeXGkN6H9jtps6lGIwZusGm5sogwGev9RcuRTB/4TLVsGe0c2Vjc3n5HzlurANqtzWmp 5yg5WLI2/NLpth7wrPwAPM7o6076wRRD0VjVJSOagAlNNfz9wUl1TlniEiQ1GQ8zXNDfaVSjDwlZS3XG6sNH3yWObfedJ0APPYdS75WJ6ZlaslFV972rN+BR CiFyAgaWFZJkjNZa9O5KcAyc3FzI3iU4QeG0qT6bM0A/Bp7GtYrobs+cM6HIlGsfYqv3KBMzX7EBERMuP44hJPtORl4liJtVo7TvJJ5uS5PABFB1WCCF8VMO JI7AJ5ufkoXW2fRX/tXElkhQMgtXC97qSS50lj7VvPmKAy4meUC+E11Bs9w9LrRNzvs= Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org The open delay time has to be applied only on the first sample of the X/Y coordinates because on the following samples the ADC channel is not changed. Removing this time from the samples after the first one, "ti,coordinate-readouts" greater than 1, decreases the total acquisition time, allowing to increase the number of acquired coordinates in the time unit. Signed-off-by: Dario Binacchi --- drivers/input/touchscreen/ti_am335x_tsc.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c index cfc943423241..f4ef218bc1b8 100644 --- a/drivers/input/touchscreen/ti_am335x_tsc.c +++ b/drivers/input/touchscreen/ti_am335x_tsc.c @@ -126,7 +126,7 @@ static int titsc_config_wires(struct titsc *ts_dev) static void titsc_step_config(struct titsc *ts_dev) { unsigned int config; - int i; + int i, n; int end_step, first_step, tsc_steps; u32 stepenable; @@ -151,9 +151,11 @@ static void titsc_step_config(struct titsc *ts_dev) first_step = TOTAL_STEPS - tsc_steps; /* Steps 16 to 16-coordinate_readouts is for X */ end_step = first_step + tsc_steps; + n = 0; for (i = end_step - ts_dev->coordinate_readouts; i < end_step; i++) { titsc_writel(ts_dev, REG_STEPCONFIG(i), config); - titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); + titsc_writel(ts_dev, REG_STEPDELAY(i), + n++ == 0 ? STEPCONFIG_OPENDLY : 0); } config = 0; @@ -175,9 +177,11 @@ static void titsc_step_config(struct titsc *ts_dev) /* 1 ... coordinate_readouts is for Y */ end_step = first_step + ts_dev->coordinate_readouts; + n = 0; for (i = first_step; i < end_step; i++) { titsc_writel(ts_dev, REG_STEPCONFIG(i), config); - titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY); + titsc_writel(ts_dev, REG_STEPDELAY(i), + n++ == 0 ? STEPCONFIG_OPENDLY : 0); } /* Make CHARGECONFIG same as IDLECONFIG */