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 545AEC433EF for ; Thu, 20 Jan 2022 15:23:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346434AbiATPXJ (ORCPT ); Thu, 20 Jan 2022 10:23:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376589AbiATPWl (ORCPT ); Thu, 20 Jan 2022 10:22:41 -0500 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2E831C061574 for ; Thu, 20 Jan 2022 07:22:41 -0800 (PST) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: detlev) with ESMTPSA id 8A83F1F45346 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1642692160; bh=idCRqSfxdKKzhaecaARxomPwbXX0Gq6x7F6Y/PBqvN0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SsIM9kB+e0zc+lGZ/eKc9qU7DgSH3XAtbt9Ok2jYTIwZ539i6jxCvrjUJsS4OD8up tI5LmTwBxKFZMcPgwaD5iTJIHk1atcQXjD5UTv/W/qNDHx+9Tw7/HzM4LMeyJvRyeO g5Xi06joYh6I4kZG+eTxbsnA8OzDypzLrKr5UaO06ZthBhxN1IabmfRP9CKgEUJUgM iKfxA2vfNXG5hx0TFEvQCcfsebuF9l+s0Bur1aJsR61Oy7Zb/g7vda6VqIhk6heItG fM99nKY5lqLJsU6yM+1/eyXPPO8DdHC0Ori1FKQuKKNVphYB6hanXSIa3UWwJrF6Pd ZDq10gnR6w+UQ== From: Detlev Casanova To: linux-kernel@vger.kernel.org Cc: Dave Stevenson , Liam Girdwood , Mark Brown Subject: [PATCH 8/9] regulator/rpi-panel-attiny: Don't read the LCD power status Date: Thu, 20 Jan 2022 10:21:49 -0500 Message-Id: <20220120152150.1952568-9-detlev.casanova@collabora.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220120152150.1952568-1-detlev.casanova@collabora.com> References: <20220120152150.1952568-1-detlev.casanova@collabora.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dave Stevenson The I2C to the Atmel is very fussy, and locks up easily on Pi0-3 particularly on reads. The LCD power status is controlled solely by this driver, so rather than reading it back from the Atmel, use the cached status last set. Signed-off-by: Dave Stevenson --- drivers/regulator/rpi-panel-attiny-regulator.c | 18 +----------------- 1 file changed, 1 insertion(+), 17 deletions(-) diff --git a/drivers/regulator/rpi-panel-attiny-regulator.c b/drivers/regulator/rpi-panel-attiny-regulator.c index 8090b9a485b5..8b80c0de1022 100644 --- a/drivers/regulator/rpi-panel-attiny-regulator.c +++ b/drivers/regulator/rpi-panel-attiny-regulator.c @@ -144,24 +144,8 @@ static int attiny_lcd_power_disable(struct regulator_dev *rdev) static int attiny_lcd_power_is_enabled(struct regulator_dev *rdev) { struct attiny_lcd *state = rdev_get_drvdata(rdev); - unsigned int data; - int ret, i; - - mutex_lock(&state->lock); - - for (i = 0; i < 10; i++) { - ret = regmap_read(rdev->regmap, REG_PORTC, &data); - if (!ret) - break; - usleep_range(10000, 12000); - } - - mutex_unlock(&state->lock); - - if (ret < 0) - return ret; - return data & PC_RST_BRIDGE_N; + return state->port_states[REG_PORTC - REG_PORTA] & PC_RST_BRIDGE_N; } static const struct regulator_init_data attiny_regulator_default = { -- 2.34.1