From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.hugovil.com (mail.hugovil.com [162.243.120.170]) (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 DC7941D63F3; Mon, 23 Mar 2026 14:20:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=162.243.120.170 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774275626; cv=none; b=Ki6+Iabh1w8DEY1SXWn7fVXpnPX08pg3mlYxmSip6bi7FoNGR8f2004XSnXDDweGjqp6BdEul1vJIYCGmg/dV6FQ16CbptyHgeLjzT8QsSN56TmHw7xs0QxEKyGzoWZOQFvOALJYH85sxdyEdXEIMFUjFRLV9I9JLbUZTVtQO0w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774275626; c=relaxed/simple; bh=flg7ElwyU59BsGjspbazLSKnxQYip83CnYjxh+Wig2w=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=U4/c4lyNDQlzzTapwWvl4z4LmqXragNDZKS5hsY7wzdS7wYfmXWL6ZrIsxUi+FYw0kgQUmqJQOPtcwxvzsHCZTK1V5UTEDxn0NX252N1GxE3+2KBo7WtglpPl2m/gymocKSceltZB3ZhJFBxutwIpHz30PvO6iCz4wD8DXgiGww= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=hugovil.com; spf=pass smtp.mailfrom=hugovil.com; dkim=pass (1024-bit key) header.d=hugovil.com header.i=@hugovil.com header.b=V57JBstp; arc=none smtp.client-ip=162.243.120.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=hugovil.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hugovil.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hugovil.com header.i=@hugovil.com header.b="V57JBstp" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=hugovil.com ; s=default; h=Content-Transfer-Encoding:Mime-Version:Message-Id:Subject:Cc: To:From:Date:subject:date:message-id:reply-to; bh=OmxJ1apwp+OWULkeu85yy8mpbmRe+k4PsouBkcueBoc=; b=V57JBstp+y9wrbGTRv998IMyEq 6lIpMt9N5WURxMfOOmTgTV3bZNy/8ZSvBwa3xO53FRSt6aeUfRHx+AKIIxf7SiITfnkMsLf/amPG/ EI/BNnOVvxnB4TE0l4Yws9m5ORxB+jrsBqVMgYtjE75YTqHJjJWKDvJGKyhWIwkkug4k=; Received: from modemcable168.174-80-70.mc.videotron.ca ([70.80.174.168] helo=pettiford.lan) by mail.hugovil.com with esmtpa (Exim 4.98.2) (envelope-from ) id 1w4g8d-000000006rQ-34YE; Mon, 23 Mar 2026 10:20:15 -0400 Date: Mon, 23 Mar 2026 10:20:15 -0400 From: Hugo Villeneuve To: Biju Cc: Biju Das , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Chris Brandt , Laurent Pinchart , Sam Ravnborg , dri-devel@lists.freedesktop.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven , Prabhakar Mahadev Lad Subject: Re: [PATCH v2 4/4] drm: renesas: rzg2l_mipi_dsi: Increase reset deassertion delay to 1 msec Message-Id: <20260323102015.957b2f855b7d54aa5d33869d@hugovil.com> In-Reply-To: <20260319164833.409126-5-biju.das.jz@bp.renesas.com> References: <20260319164833.409126-1-biju.das.jz@bp.renesas.com> <20260319164833.409126-5-biju.das.jz@bp.renesas.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Spam_score: -2.0 X-Spam_bar: -- Hi Biju, On Thu, 19 Mar 2026 16:48:28 +0000 Biju wrote: > From: Biju Das > > The RZ/G2L hardware manual (Rev. 1.50, May 2025), Section 34.4.2.1, > requires waiting more than 1 msec after deasserting the CMN_RSTB signal > before the DSI-Tx module is ready. Increase the delay from 1 usec to > 1 msec by replacing udelay(1) with fsleep(1000). > > Signed-off-by: Biju Das In your first submission, I commented that "...this should be backported to stable branches (missing Fixes / Cc: stable tags)?" and you answered with "Agreed, will add fixes/stable tags". If you still agree, this patch should be #3 in your list, so that it is easier/straightforward to backport to stable branches. > --- > v1->v2: > * Updated commit header and description. > --- > drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c > index 5020be0f72ac..715872130780 100644 > --- a/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c > +++ b/drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c > @@ -807,7 +807,7 @@ static int rzg2l_mipi_dsi_startup(struct rzg2l_mipi_dsi *dsi, > if (ret < 0) > goto err_phy; > > - udelay(1); > + fsleep(1000); > } > > return 0; > -- > 2.43.0 > > -- Hugo Villeneuve