From patchwork Tue Mar 8 16:07:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chen-Yu Tsai X-Patchwork-Id: 12774004 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0AA2DC433EF for ; Tue, 8 Mar 2022 16:08:19 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 176DD10E25C; Tue, 8 Mar 2022 16:08:13 +0000 (UTC) Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id C064810E2D3 for ; Tue, 8 Mar 2022 16:08:11 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3CA226170B; Tue, 8 Mar 2022 16:08:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8484AC340EF; Tue, 8 Mar 2022 16:08:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1646755690; bh=xRcUbaosez9eu3DFVA2FXMe6aBdN7Vix+MKm/XQd+FI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ogol2p7vJMvLPc+WiHqrwoWVCAa6G3PXJpADWQPrycGCZOdS8nWNULGU9v9Dqb8ol D1VmJJYhCbe9QYBDZY88WtXwCjSxF9B7SFLCsqBsmqxZFPvop5OLuyiIkUK95SG8m+ Txm2QC7lbG64ZywsNlr6lCI84p2Tqck1uoJKXq3auR0lR3ejXrxKFyUvLt4sMR47oI qRxsz9C4pLfaMreloqbsV4g8DgaCC/wFTXeK9/HiQQCxVfjIvT1h3qEeclXgET5s9M 2BfBhxuswFBbdQSvX17HP1JnDhR9nBe26ab9piTqMPN7gPqLws5P5pO2M7VQvXCZux yFZvXnhYkd9VQ== Received: by wens.tw (Postfix, from userid 1000) id 49B865FA0C; Wed, 9 Mar 2022 00:08:08 +0800 (CST) From: Chen-Yu Tsai To: Javier Martinez Canillas , David Airlie , Daniel Vetter Subject: [PATCH 2/2] drm: ssd130x: Always apply segment remap setting Date: Wed, 9 Mar 2022 00:07:58 +0800 Message-Id: <20220308160758.26060-2-wens@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220308160758.26060-1-wens@kernel.org> References: <20220308160758.26060-1-wens@kernel.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Chen-Yu Tsai , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Chen-Yu Tsai Currently the ssd130x driver only sets the segment remap setting when the device tree requests it; it however does not clear the setting if it is not requested. This leads to the setting incorrectly persisting if the hardware is always on and has no reset GPIO wired. This might happen when a developer is trying to find the correct settings for an unknown module, and cause the developer to get confused because the settings from the device tree are not consistently applied. Make the driver apply the segment remap setting consistently, setting the value correctly based on the device tree setting. This also makes this setting's behavior consistent with the other settings, which are always applied. Fixes: a61732e80867 ("drm: Add driver for Solomon SSD130x OLED displays") Signed-off-by: Chen-Yu Tsai Acked-by: Javier Martinez Canillas --- drivers/gpu/drm/solomon/ssd130x.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c index ccd378135589..d08d86ef07bc 100644 --- a/drivers/gpu/drm/solomon/ssd130x.c +++ b/drivers/gpu/drm/solomon/ssd130x.c @@ -48,7 +48,7 @@ #define SSD130X_CONTRAST 0x81 #define SSD130X_SET_LOOKUP_TABLE 0x91 #define SSD130X_CHARGE_PUMP 0x8d -#define SSD130X_SEG_REMAP_ON 0xa1 +#define SSD130X_SET_SEG_REMAP 0xa0 #define SSD130X_DISPLAY_OFF 0xae #define SSD130X_SET_MULTIPLEX_RATIO 0xa8 #define SSD130X_DISPLAY_ON 0xaf @@ -61,6 +61,8 @@ #define SSD130X_SET_COM_PINS_CONFIG 0xda #define SSD130X_SET_VCOMH 0xdb +#define SSD130X_SET_SEG_REMAP_MASK GENMASK(0, 0) +#define SSD130X_SET_SEG_REMAP_SET(val) FIELD_PREP(SSD130X_SET_SEG_REMAP_MASK, (val)) #define SSD130X_SET_COM_SCAN_DIR_MASK GENMASK(3, 3) #define SSD130X_SET_COM_SCAN_DIR_SET(val) FIELD_PREP(SSD130X_SET_COM_SCAN_DIR_MASK, (val)) #define SSD130X_SET_CLOCK_DIV_MASK GENMASK(3, 0) @@ -235,7 +237,7 @@ static void ssd130x_power_off(struct ssd130x_device *ssd130x) static int ssd130x_init(struct ssd130x_device *ssd130x) { - u32 precharge, dclk, com_invdir, compins, chargepump; + u32 precharge, dclk, com_invdir, compins, chargepump, seg_remap; int ret; /* Set initial contrast */ @@ -244,11 +246,11 @@ static int ssd130x_init(struct ssd130x_device *ssd130x) return ret; /* Set segment re-map */ - if (ssd130x->seg_remap) { - ret = ssd130x_write_cmd(ssd130x, 1, SSD130X_SEG_REMAP_ON); - if (ret < 0) - return ret; - } + seg_remap = (SSD130X_SET_SEG_REMAP | + SSD130X_SET_SEG_REMAP_SET(ssd130x->seg_remap)); + ret = ssd130x_write_cmd(ssd130x, 1, seg_remap); + if (ret < 0) + return ret; /* Set COM direction */ com_invdir = (SSD130X_SET_COM_SCAN_DIR |