From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.tq-group.com (mx1.tq-group.com [93.104.207.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ACFCB2E3F7 for ; Thu, 26 Sep 2024 14:09:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=93.104.207.81 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727359760; cv=none; b=s0pngLZTdaYISqBia62OHnWqxx4PNaWy5Nnp4S5DVjUgjT2XUij9PiQWVsXRFsfJefBcYWpXWRbUz1R1OyMC4OXt+XqPoKbzKWA8oTeuAl8i2icGOTIoPB0TUslAJCNpMaiiqH6BKNSw2t3P9YgK37ic90lMYUc79EHFpraiPk8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727359760; c=relaxed/simple; bh=aU7DhuM0MRl/oleJUgNjJ5QLB7b0wpiBWF3UI3tBfO8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=kG4vGs7+u9rTfWgb4/cpblH63AusMDtSLzGXoEySpkhygXTrnOGzVMyVExmJ9JJeOVlacOy9rWMLMhutM5eCXPNodo8YtZTVzVVCtyPhnYL14L+y9ADYBYO9Ls/1k7veV0AI/UKsz7d92rNScMJWdyMkMcTAc+lyskrOCXgyyH8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ew.tq-group.com; spf=pass smtp.mailfrom=ew.tq-group.com; dkim=pass (2048-bit key) header.d=tq-group.com header.i=@tq-group.com header.b=gQO8PtmS; dkim=fail (0-bit key) header.d=ew.tq-group.com header.i=@ew.tq-group.com header.b=OPWxx9X4 reason="key not found in DNS"; arc=none smtp.client-ip=93.104.207.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ew.tq-group.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ew.tq-group.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=tq-group.com header.i=@tq-group.com header.b="gQO8PtmS"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=ew.tq-group.com header.i=@ew.tq-group.com header.b="OPWxx9X4" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tq-group.com; i=@tq-group.com; q=dns/txt; s=key1; t=1727359756; x=1758895756; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=aU7DhuM0MRl/oleJUgNjJ5QLB7b0wpiBWF3UI3tBfO8=; b=gQO8PtmSUyyNyCM18jEsr1uenVrnYMemasRy5qTZCYTjXpzelRbRPFII Ir3YVL1m1nMtIS2D96Rv3lWbG4myvT3sTBss0qRqqsiUyQBQKlO1WDgXE kiNTV3TJDRszjeCTqLMoyhPKtidnqaIJL/4igfz5hy8JOZPjl3uSZ+GPW STA0vXYPSTBXrABdv1Qpa2BvHZn/X9Bcr1zKBgbJmoSvLl/lNd0fzn/WJ mcWHHNIU1dA+U2ohF79co7J6HCPvPICAUWCnylKv/KUH+nIfYvolkyGgP qBLiHMrUeYeebyTFlKXml4Q8+iqH1qqrCeq1g7/5PE/CLRkbb+7eiK4Pw g==; X-CSE-ConnectionGUID: WesfB8g6TUKNOiDFyfVYYQ== X-CSE-MsgGUID: oLILoqlWRbGX4q8dhpshqw== X-IronPort-AV: E=Sophos;i="6.11,155,1725314400"; d="scan'208";a="39145675" Received: from vmailcow01.tq-net.de ([10.150.86.48]) by mx1.tq-group.com with ESMTP; 26 Sep 2024 16:09:11 +0200 X-CheckPoint: {66F56B07-1-B62731C4-FB8D8F8A} X-MAIL-CPID: 52217610F519004650615E3A9DFC3094_3 X-Control-Analysis: str=0001.0A682F20.66F56B07.00CA,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 965B4163464; Thu, 26 Sep 2024 16:09:04 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ew.tq-group.com; s=dkim; t=1727359746; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=aU7DhuM0MRl/oleJUgNjJ5QLB7b0wpiBWF3UI3tBfO8=; b=OPWxx9X4ANG+tfcreBmeS7UkQnvUB8Tdyb3lXfCasPbyVNlo51xaTvZixvroKUOUzmSLZt Nm7+NU9S8+iOyDJlYY5c9MWNMr+aB9kcNGz+szuokdlhPEg9e+fJz/NyVlZcysPfnTAxCG vJ8A/goAltjeIWEB5wUW8hAZLK0BNpTGlS+SErUZcIa+6WMiBKNgDcwdl5hGoyOPK1VvHb yVwwrnz3tfNIcdfvv98iPWHJQw8E46dip1xZRbKUCnwZHmhqoHEFyimeIN6azYSLxPTMtz DVZvlFI+hrz5tGHoTSVQ9LstuT+rS7979zREacLyehfrn0HJYWU+RmQq2LuV3Q== From: Alexander Stein To: Dmitry Baryshkov Cc: Stefan Agner , Alison Wang , David Airlie , Daniel Vetter , Matthias Schiffer , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Simona Vetter , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 2/2] drm: fsl-dcu: enable PIXCLK on LS1021A Date: Thu, 26 Sep 2024 16:09:03 +0200 Message-ID: <2754373.mvXUDI8C0e@steina-w> Organization: TQ-Systems GmbH In-Reply-To: References: <20240926055552.1632448-1-alexander.stein@ew.tq-group.com> <20240926055552.1632448-2-alexander.stein@ew.tq-group.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1" X-Last-TLS-Session-Version: TLSv1.3 Hi Dmitry, Am Donnerstag, 26. September 2024, 08:05:56 CEST schrieb Dmitry Baryshkov: > On Thu, Sep 26, 2024 at 07:55:51AM GMT, Alexander Stein wrote: > > From: Matthias Schiffer > >=20 > > The PIXCLK needs to be enabled in SCFG before accessing certain DCU > > registers, or the access will hang. For simplicity, the PIXCLK is enabl= ed > > unconditionally, resulting in increased power consumption. >=20 > By this description it looks like a fix. What is the first broken > commit? It needs to be mentioned in the Fixes: tag. Or is it hat > existing devices have been enabling SCFG in some other way? We discussed this internally and it seems this never worked, unless PIXCLK was already enabled in SCFG by a different way, e.g. firmware, etc. Best regards, Alexander > >=20 > > Signed-off-by: Matthias Schiffer > > Signed-off-by: Alexander Stein > > --- > > Changes in v2: > > * Add note about power consumption in commit message > > * Add note about power consumption in comment > > * Fix alignment > >=20 >=20 >=20 =2D-=20 TQ-Systems GmbH | M=FChlstra=DFe 2, Gut Delling | 82229 Seefeld, Germany Amtsgericht M=FCnchen, HRB 105018 Gesch=E4ftsf=FChrer: Detlef Schneider, R=FCdiger Stahl, Stefan Schneider http://www.tq-group.com/