From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Gross Subject: Re: [PATCH v2 2/3] ata: ahci-platform: Add ports-implemented DT bindings. Date: Thu, 31 Mar 2016 13:23:54 -0500 Message-ID: <20160331182354.GB8252@hector.attlocal.net> 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 Return-path: Content-Disposition: inline In-Reply-To: <1459445500-9071-3-git-send-email-srinivas.kandagatla@linaro.org> Sender: linux-ide-owner@vger.kernel.org To: Srinivas Kandagatla Cc: Tejun Heo , linux-ide@vger.kernel.org, Rob Herring , 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 List-Id: linux-arm-msm@vger.kernel.org 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 Reviewed-by: Andy Gross