Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758030AbcCaReP (ORCPT ); Thu, 31 Mar 2016 13:34:15 -0400 Received: from mail-yw0-f196.google.com ([209.85.161.196]:36343 "EHLO mail-yw0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756184AbcCaReK (ORCPT ); Thu, 31 Mar 2016 13:34:10 -0400 Date: Thu, 31 Mar 2016 13:34:07 -0400 From: Tejun Heo To: Srinivas Kandagatla Cc: linux-ide@vger.kernel.org, Rob Herring , Andy Gross , Hans de Goede , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, jmaggard10@gmail.com Subject: Re: [PATCH v2 2/3] ata: ahci-platform: Add ports-implemented DT bindings. Message-ID: <20160331173407.GE24661@htj.duckdns.org> References: <1459445500-9071-1-git-send-email-srinivas.kandagatla@linaro.org> <1459445500-9071-3-git-send-email-srinivas.kandagatla@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1459445500-9071-3-git-send-email-srinivas.kandagatla@linaro.org> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1012 Lines: 27 On Thu, Mar 31, 2016 at 06:31:39PM +0100, Srinivas Kandagatla wrote: > On some SOCs PORTS_IMPL register value is never programmed by the > firmware and left at zero value. Which means that no sata ports are > available for software. AHCI driver used to cope up with this by > fabricating the port_map if the PORTS_IMPL register is read zero, > but recent patch broke this workaround as zero value was valid for > NVMe disks. > > This patch adds ports-implemented DT bindings as workaround for this issue > in a way that DT can can override the PORTS_IMPL register in cases where > the firmware did not program it already. > > Fixes: 566d1827df2e ("libata: disable forced PORTS_IMPL for >= AHCI 1.3) > Signed-off-by: Srinivas Kandagatla For 1 and 2, Acked-by: Tejun Heo I can route all three through libata/for-4.6-fixes once the platform side is acked. If it's better to route these through the platform tree, please feel free to do so. Thanks. -- tejun