From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vidya Sagar Subject: Re: [PATCH 01/10] PCI: save pci_bus pointer in pcie_port structure Date: Thu, 28 Mar 2019 13:08:48 +0530 Message-ID: References: <1553613207-3988-1-git-send-email-vidyas@nvidia.com> <1553613207-3988-2-git-send-email-vidyas@nvidia.com> <20190328151008.5e563e3a@xhacker.debian> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20190328151008.5e563e3a@xhacker.debian> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Jisheng Zhang Cc: "mark.rutland@arm.com" , "heiko@sntech.de" , "hayashi.kunihiko@socionext.com" , "tiwai@suse.de" , "catalin.marinas@arm.com" , "spujar@nvidia.com" , "will.deacon@arm.com" , "kthota@nvidia.com" , "mperttunen@nvidia.com" , "linux-tegra@vger.kernel.org" , "thierry.reding@gmail.com" , "jonathanh@nvidia.com" , "stefan.wahren@i2se.com" , "lorenzo.pieralisi@arm.com" , "krzk@kernel.org" , "kishon@ti.com" , "maxime.ripard@bootlin.com" , "jagan@amarulasolutions.com" , linux-pc List-Id: devicetree@vger.kernel.org On 3/28/2019 12:48 PM, Jisheng Zhang wrote: > On Tue, 26 Mar 2019 20:43:18 +0530Vidya Sagar wrote: > >> >> save pci_bus pointer created by PCIe sub-system's >> pci_scan_root_bus_bridge() to be used by host controller drivers for post >> processing. Tegra host controller driver needs it for the following >> reasons >> - to derive pci_host_bridge structure from pci_bus which is used to >> configure iATU's outbound regions for different windows accesses >> - to traverse and configure downstream hierarchy. One such case is, >> configuring all immediate downstream devices to D0 state before transiting >> link to L2 state. Saving pci_bus pointer seems the best method compared to >> deriving it by other means. > > hmm, I submitted similar patch for another purpose last month, > > https://patchwork.kernel.org/patch/10830029/ > > then v3 weeks ago > > https://lkml.org/lkml/2019/3/18/375 > > And get Acks from Gustavo. But it seems that it isn't merged to dwc next > branch in Lorenzo's tree > > Maybe Lorenzo have some idea of handling this case. > > Thanks > Thanks for the info. I'll drop my patch once I see yours in dwc next branch. Thanks, Vidya Sagar