From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 669ABCCD198 for ; Tue, 14 Oct 2025 13:27:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=x3u4n0DV48sPams3RQXJLQMjNcNlDx2NBtU8xiY+dTQ=; b=WF1RHbK1o49eW6 W8moby5ld4bcPJsuJrDsWwJj59ayjC/stdZhMCCBL6zfKzIyL3DDtk4qXl1FlrSM6/gdzryJVmCO9 F9RuvYccrRP5lXFV+gga96dsNjdRa6QzLRqCQBlzsjri5wzsVBW/82UDI4Ft2z8ULg+dLbRGCB3vD sr/FJk7exfHdbOGno+h4wuf26eAjoAAiIgoYLTjHWt3Mu6Bhr6ZU7/qYHBFOWuXQIXsSIlFyRD/8/ UrDIjxngeDBcmBiypVfb880mnU66S/HUWG7uSboFkNJ8f8FdfssTWUpXmKVMPqNNn8VAxks6YkBEe 0xr9ip+xp5dK23+LBFXQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v8f3P-0000000GTj4-0Ppt; Tue, 14 Oct 2025 13:27:03 +0000 Received: from 60-248-80-70.hinet-ip.hinet.net ([60.248.80.70] helo=Atcsqr.andestech.com) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1v8f3J-0000000GTfC-3XAM for linux-riscv@lists.infradead.org; Tue, 14 Oct 2025 13:27:02 +0000 Received: from Atcsqr.andestech.com (localhost [127.0.0.2] (may be forged)) by Atcsqr.andestech.com with ESMTP id 59EC8pdB062813 for ; Tue, 14 Oct 2025 20:08:51 +0800 (+08) (envelope-from randolph@andestech.com) Received: from mail.andestech.com (ATCPCS31.andestech.com [10.0.1.89]) by Atcsqr.andestech.com with ESMTPS id 59EC3vK0060853 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 14 Oct 2025 20:03:57 +0800 (+08) (envelope-from randolph@andestech.com) Received: from atctrx.andestech.com (10.0.15.173) by ATCPCS31.andestech.com (10.0.1.89) with Microsoft SMTP Server id 14.3.498.0; Tue, 14 Oct 2025 20:03:57 +0800 From: Randolph Lin To: CC: , , , , , , , , , , , , , , , , , , , , , , , Randolph Lin Subject: [PATCH v8 1/5] PCI: dwc: Allow adjusting the number of ob/ib windows in glue driver Date: Tue, 14 Oct 2025 20:03:45 +0800 Message-ID: <20251014120349.656553-2-randolph@andestech.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251014120349.656553-1-randolph@andestech.com> References: <20251014120349.656553-1-randolph@andestech.com> MIME-Version: 1.0 X-Originating-IP: [10.0.15.173] X-DKIM-Results: atcpcs31.andestech.com; dkim=none; X-DNSRBL: X-MAIL: Atcsqr.andestech.com 59EC8pdB062813 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251014_062658_290953_45AE4904 X-CRM114-Status: GOOD ( 11.33 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org The number of ob/ib windows is determined through write-read loops on registers in the core driver. Some glue drivers need to adjust the number of ob/ib windows to meet specific requirements,such as hardware limitations. This change allows the glue driver to adjust the number of ob/ib windows to satisfy platform-specific constraints. The glue driver may adjust the number of ob/ib windows, but the values must stay within hardware limits. Signed-off-by: Randolph Lin --- drivers/pci/controller/dwc/pcie-designware.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index c644216995f6..a860890febc3 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -851,8 +851,16 @@ void dw_pcie_iatu_detect(struct dw_pcie *pci) max = 0; } - pci->num_ob_windows = ob; - pci->num_ib_windows = ib; + if (!pci->num_ob_windows) + pci->num_ob_windows = ob; + else if (pci->num_ob_windows > ob) + dev_err(pci->dev, "Adjusted ob windows exceed the limit\n"); + + if (!pci->num_ib_windows) + pci->num_ib_windows = ib; + else if (pci->num_ib_windows > ib) + dev_err(pci->dev, "Adjusted ib windows exceed the limit\n"); + pci->region_align = 1 << fls(min); pci->region_limit = (max << 32) | (SZ_4G - 1); -- 2.34.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv