From patchwork Thu Sep 26 05:55:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Stein X-Patchwork-Id: 13812817 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 6F27CCCFA17 for ; Thu, 26 Sep 2024 05:56:06 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E756E10EA8C; Thu, 26 Sep 2024 05:56:05 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=tq-group.com header.i=@tq-group.com header.b="WyhWTGMG"; dkim=fail reason="key not found in DNS" (0-bit key; unprotected) header.d=ew.tq-group.com header.i=@ew.tq-group.com header.b="lLemQXQ3"; dkim-atps=neutral Received: from mx1.tq-group.com (mx1.tq-group.com [93.104.207.81]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3AABE10EA8C for ; Thu, 26 Sep 2024 05:56:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tq-group.com; i=@tq-group.com; q=dns/txt; s=key1; t=1727330164; x=1758866164; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bLzJtbfa2s5QAjm0ipC22hKl20Uv3y0q/Em4v3hXr0c=; b=WyhWTGMGBNSZfzI0FuaTY0Tozu5sfyqBPV/jg3xIQg0OlNJuCwQ2w7Yk 7JnmItXEwOBm+JCn28pDCk/fP59ISUtBe6JWMrknwz6TneqR1bqeHRB88 Nc3i7c60/MkzcjtAvY51RRPw7ZJ3injHuwWyc152NAJO2rxjTMluIjFsB cdWMDWCrfmsAijNoSSAB77jTeCiHBBMY7b7emKFTOiRzmJf89PALNikuw zM/ikFkpgQcNruh8zV5MXA8bes/ihQocQw/oQJ3xWqC76vVwwCS9HfbMg sBE2jAyDNxDlR/ipk1jcMAvTJ4vhURrVL1D52bKh5gRiqQo+BwD5ZFCw2 Q==; X-CSE-ConnectionGUID: aU/ZGlV9RNKTAdhj5VL7+g== X-CSE-MsgGUID: BALAbA55R4iTxhd71svacw== X-IronPort-AV: E=Sophos;i="6.10,259,1719871200"; d="scan'208";a="39129818" Received: from vmailcow01.tq-net.de ([10.150.86.48]) by mx1.tq-group.com with ESMTP; 26 Sep 2024 07:56:03 +0200 X-CheckPoint: {66F4F773-16-B62731C4-FB8D8F8A} X-MAIL-CPID: 0B3461EE8FD9AE5E753EA9A3C01306C1_3 X-Control-Analysis: str=0001.0A682F27.66F4F773.00E7, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0 Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id F06CB160A3D; Thu, 26 Sep 2024 07:55:58 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ew.tq-group.com; s=dkim; t=1727330159; h=from:subject:date:message-id:to:cc:mime-version: content-transfer-encoding:in-reply-to:references; bh=bLzJtbfa2s5QAjm0ipC22hKl20Uv3y0q/Em4v3hXr0c=; b=lLemQXQ3BMrZxixLXAaMhfzBGdx/uHDt++UGsHM032fL6xcM1L7iYRAtkO+4lAWvDG1Wtb 158c7GQmzz9yvpCgrxTM9rxJdliCnTAtgapqi4+SiNpSd83+t06bNba79h/vVNAxZ8ALo0 Ogv7LLiKOaVj7/ZNb1+tPVzoJAmvdAr1EXw9QwFiAMtJxkUnHqR25NuXZo6aWZ4FliSNVa bM0GggHKYRR/t2jWYhyNu8fyJv4cRRbG3QCYUTk7rlDc483CDuEk/TLc3slEcThQt2mS6d F6ebguRBQDuTsAfIGvzPXVwHeBuGzwhGzp+LMplDw69Cv5UsFiazLvnK5cziHQ== From: Alexander Stein To: Stefan Agner , Alison Wang , David Airlie , Daniel Vetter , Matthias Schiffer , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Simona Vetter Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Alexander Stein Subject: [PATCH v2 2/2] drm: fsl-dcu: enable PIXCLK on LS1021A Date: Thu, 26 Sep 2024 07:55:51 +0200 Message-Id: <20240926055552.1632448-2-alexander.stein@ew.tq-group.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240926055552.1632448-1-alexander.stein@ew.tq-group.com> References: <20240926055552.1632448-1-alexander.stein@ew.tq-group.com> MIME-Version: 1.0 X-Last-TLS-Session-Version: TLSv1.3 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Matthias Schiffer The PIXCLK needs to be enabled in SCFG before accessing certain DCU registers, or the access will hang. For simplicity, the PIXCLK is enabled unconditionally, resulting in increased power consumption. Signed-off-by: Matthias Schiffer Signed-off-by: Alexander Stein Acked-by: Dmitry Baryshkov --- Changes in v2: * Add note about power consumption in commit message * Add note about power consumption in comment * Fix alignment drivers/gpu/drm/fsl-dcu/Kconfig | 1 + drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c | 15 +++++++++++++++ drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h | 3 +++ 3 files changed, 19 insertions(+) diff --git a/drivers/gpu/drm/fsl-dcu/Kconfig b/drivers/gpu/drm/fsl-dcu/Kconfig index 5ca71ef873259..c9ee98693b48a 100644 --- a/drivers/gpu/drm/fsl-dcu/Kconfig +++ b/drivers/gpu/drm/fsl-dcu/Kconfig @@ -8,6 +8,7 @@ config DRM_FSL_DCU select DRM_PANEL select REGMAP_MMIO select VIDEOMODE_HELPERS + select MFD_SYSCON if SOC_LS1021A help Choose this option if you have an Freescale DCU chipset. If M is selected the module will be called fsl-dcu-drm. diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c index dd820f19482ad..63da55fe2eaf8 100644 --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c @@ -100,12 +100,27 @@ static void fsl_dcu_irq_uninstall(struct drm_device *dev) static int fsl_dcu_load(struct drm_device *dev, unsigned long flags) { struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; + struct regmap *scfg; int ret; ret = fsl_dcu_drm_modeset_init(fsl_dev); if (ret < 0) return dev_err_probe(dev->dev, ret, "failed to initialize mode setting\n"); + scfg = syscon_regmap_lookup_by_compatible("fsl,ls1021a-scfg"); + if (PTR_ERR(scfg) != -ENODEV) { + /* + * For simplicity, enable the PIXCLK unconditionally, + * resulting in increased power consumption. Disabling + * the clock in PM or on unload could be implemented as + * a future improvement. + */ + ret = regmap_update_bits(scfg, SCFG_PIXCLKCR, SCFG_PIXCLKCR_PXCEN, + SCFG_PIXCLKCR_PXCEN); + if (ret < 0) + return dev_err_probe(dev->dev, ret, "failed to enable pixclk\n"); + } + ret = drm_vblank_init(dev, dev->mode_config.num_crtc); if (ret < 0) { dev_err(dev->dev, "failed to initialize vblank\n"); diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h index e2049a0e8a92a..566396013c04a 100644 --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h @@ -160,6 +160,9 @@ #define FSL_DCU_ARGB4444 12 #define FSL_DCU_YUV422 14 +#define SCFG_PIXCLKCR 0x28 +#define SCFG_PIXCLKCR_PXCEN BIT(31) + #define VF610_LAYER_REG_NUM 9 #define LS1021A_LAYER_REG_NUM 10