From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pg1-x542.google.com ([2607:f8b0:4864:20::542]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gXLAQ-0005bi-07 for barebox@lists.infradead.org; Thu, 13 Dec 2018 07:12:23 +0000 Received: by mail-pg1-x542.google.com with SMTP id d72so600849pga.9 for ; Wed, 12 Dec 2018 23:12:07 -0800 (PST) From: Andrey Smirnov Date: Wed, 12 Dec 2018 23:10:58 -0800 Message-Id: <20181213071144.31691-13-andrew.smirnov@gmail.com> In-Reply-To: <20181213071144.31691-1-andrew.smirnov@gmail.com> References: <20181213071144.31691-1-andrew.smirnov@gmail.com> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 12/58] PCI: designware: Explain why we don't program ATU for some platforms To: barebox@lists.infradead.org Cc: Andrey Smirnov Port of a Linux commit dd193929d91e1b44b90f81509feeff10c94ddc4d Some platforms don't support ATU, e.g., pci-keystone.c. These platforms use their own address translation component rather than ATU, and they provide the rd_other_conf and wr_other_conf methods to program the translation component and perform the access. Add a comment to explain why we don't program the ATU for these platforms. [bhelgaas: changelog] Signed-off-by: Jisheng Zhang Signed-off-by: Bjorn Helgaas Signed-off-by: Andrey Smirnov --- drivers/pci/pcie-designware.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/pci/pcie-designware.c b/drivers/pci/pcie-designware.c index 28f57f9d2..34dba5898 100644 --- a/drivers/pci/pcie-designware.c +++ b/drivers/pci/pcie-designware.c @@ -290,6 +290,11 @@ int __init dw_pcie_host_init(struct pcie_port *pp) if (pp->ops->host_init) pp->ops->host_init(pp); + /* + * If the platform provides ->rd_other_conf, it means the platform + * uses its own address translation component rather than ATU, so + * we should not program the ATU here. + */ if (!pp->ops->rd_other_conf) dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1, PCIE_ATU_TYPE_MEM, pp->mem_mod_base, -- 2.19.1 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox