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[98.142.130.235]) by smtp.gmail.com with ESMTPSA id d14sm2079709pfq.117.2020.01.10.00.56.32 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 10 Jan 2020 00:56:35 -0800 (PST) Date: Fri, 10 Jan 2020 16:56:28 +0800 From: Shawn Guo To: Vidya Sagar Subject: Re: [PATCH] PCI: dwc: Separate CFG0 and CFG1 into different ATU regions Message-ID: <20200110085626.GA17787@T480> References: <20200109060657.1953-1-shawn.guo@linaro.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200110_005637_349087_A140D295 X-CRM114-Status: GOOD ( 11.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lorenzo Pieralisi , Jingoo Han , linux-pci@vger.kernel.org, Pratyush Anand , Gustavo Pimentel , Bjorn Helgaas , Zaihai Yu , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Vidya, On Thu, Jan 09, 2020 at 11:04:01PM +0530, Vidya Sagar wrote: > > > On 1/9/2020 11:36 AM, Shawn Guo wrote: > > External email: Use caution opening links or attachments > > > > > > Some platform has 4 (or more) viewports. In that case, CFG0 and CFG1 > > can be separated into different ATU regions. > Is there any specific benefit with this scheme? Thanks much for the question which leads me to go back to vendor for checking design details of 4 (or more) viewports. It turns out the patch is not complete. We need more code change to get the benefit of using separate ATU region for CFG0 and CFG1, that is the dw_pcie_prog_outbound_atu() call in dw_pcie_access_other_conf() function can be saved. But in the meanwhile, we need to pass 'va_cfg_base | busdev' as the first argument to dw_pcie_write/read() in there. @Lorenzo, @Bjorn, Please ignore this patch. Shawn _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel