From patchwork Mon Dec 3 01:29:32 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 10708521 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4E95614E2 for ; Mon, 3 Dec 2018 01:29:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 416142A674 for ; Mon, 3 Dec 2018 01:29:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 354372A677; Mon, 3 Dec 2018 01:29:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6D5E92A675 for ; Mon, 3 Dec 2018 01:29:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725793AbeLCB3p (ORCPT ); Sun, 2 Dec 2018 20:29:45 -0500 Received: from muru.com ([72.249.23.125]:55798 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725785AbeLCB3p (ORCPT ); Sun, 2 Dec 2018 20:29:45 -0500 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 1690E8105; Mon, 3 Dec 2018 01:29:43 +0000 (UTC) From: Tony Lindgren To: Dmitry Torokhov Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, Axel Haslam , Felipe Balbi , Illia Smyrnov , Marcel Partap , Merlijn Wajer , Michael Scott , NeKit , Pavel Machek , Sebastian Reichel Subject: [PATCH 1/2] Input: omap-keypad: Fix keyboard debounce configuration Date: Sun, 2 Dec 2018 17:29:32 -0800 Message-Id: <20181203012933.6647-1-tony@atomide.com> X-Mailer: git-send-email 2.19.2 MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP I noticed that the Android v3.0.8 kernel on droid4 is using different keypad values from the mainline kernel and does not have issues with keys occasionally being stuck until pressed again. Turns out there was an earlier patch posted to fix this as "Input: omap-keypad: errata i689: Correct debounce time", but it was never reposted to fix use macros for timing calculations. This updated version is using macros, and also fixes the use of the input clock rate to use 32768KiHz instead of 32000KiHz. And we want to use the known good Android kernel values of 3 and 6 instead of 2 and 6 in the earlier patch. Cc: Axel Haslam Cc: Felipe Balbi Cc: Illia Smyrnov Cc: Marcel Partap Cc: Merlijn Wajer Cc: Michael Scott Cc: NeKit Cc: Pavel Machek Cc: Sebastian Reichel Reported-by: Pavel Machek Signed-off-by: Tony Lindgren --- drivers/input/keyboard/omap4-keypad.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c --- a/drivers/input/keyboard/omap4-keypad.c +++ b/drivers/input/keyboard/omap4-keypad.c @@ -60,8 +60,18 @@ /* OMAP4 values */ #define OMAP4_VAL_IRQDISABLE 0x0 -#define OMAP4_VAL_DEBOUNCINGTIME 0x7 -#define OMAP4_VAL_PVT 0x7 + +/* + * Errata i689: If a key is released for a time shorter than debounce time, + * the keyboard will idle and never detect the key release. The workaround + * is to use at least a 12ms debounce time. See omap5432 TRM chapter + * "26.4.6.2 Keyboard Controller Timer" for more information. + */ +#define OMAP4_KEYPAD_PTV_DIV_128 0x6 +#define OMAP4_KEYPAD_DEBOUNCINGTIME_MS(dbms, ptv) \ + ((((dbms) * 1000) / ((1 << ((ptv) + 1)) * (1000000 / 32768))) - 1) +#define OMAP4_VAL_DEBOUNCINGTIME_16MS \ + OMAP4_KEYPAD_DEBOUNCINGTIME_MS(16, OMAP4_KEYPAD_PTV_DIV_128) enum { KBD_REVISION_OMAP4 = 0, @@ -181,9 +191,9 @@ static int omap4_keypad_open(struct input_dev *input) kbd_writel(keypad_data, OMAP4_KBD_CTRL, OMAP4_DEF_CTRL_NOSOFTMODE | - (OMAP4_VAL_PVT << OMAP4_DEF_CTRL_PTV_SHIFT)); + (OMAP4_KEYPAD_PTV_DIV_128 << OMAP4_DEF_CTRL_PTV_SHIFT)); kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME, - OMAP4_VAL_DEBOUNCINGTIME); + OMAP4_VAL_DEBOUNCINGTIME_16MS); /* clear pending interrupts */ kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS, kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));