From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3926617FE; Fri, 24 Jan 2025 05:40:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737697230; cv=none; b=JhvnK9IKAflkLshMN4DTcIPIL1RxtjUsWkq55CCZXmdn4bHPCUmU3dUrMXxVxi5CKZec4EG3LdkC0xxpzfQhNz3X+tjRSSeGAVp1i7ZC6mddXdfF7MwBjue37V6q4Xt81RAr6PMVrdkoHmD7MjNLZOxvNdSGgFn33Kcw+wLjIlc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737697230; c=relaxed/simple; bh=Hpjcxr9NukUy6rJZPiuMedtcj36WhubCJwMNNtamwt8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=pPh4rFzn4q2dKaPpovBYTkqiEsGPEP/zz0/8tJdlRSakmQhU/FcXGeF69D0XnGA/KpnohYugsbet4vz1C2b7RzogXBeBwwz4dbS8t8SyAVmuxzPqPEQfv51op7A6jygx6RKJg9sYcm8DYTYij3pyxelrSRyXY9QRLU5kJ7vhIWk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=X+lGmCTZ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="X+lGmCTZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 27E6DC4CED2; Fri, 24 Jan 2025 05:40:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737697229; bh=Hpjcxr9NukUy6rJZPiuMedtcj36WhubCJwMNNtamwt8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=X+lGmCTZs8sGOW6HzIVGVvQvgKqFhipe+Iqw0GVTHG5saHPycCaqBeIV77FsTu3LL a7gW9l9AV9hH1DGiBnSnQQhAqzMLncOru47QDXavHK7FceU4AzDMi0hOEtajnY+qrG Np9KmuBn4z8LUzc/xPOeo49jxPFb1lhWDimda2SulGY7yxMMt2XpDg0UljMAwDPuW4 zYCn9t/Aeb6cCO+SgBiUe4EP01YMfpd0ktQ736SLgwoyIX5FNNkPtpP8SNXpJ1kdxU 2FVC/HFMtZznXQAS9qPdYWYYvlIOVlh5i5SSX7FC1wuFPjqif7D522uwliFtjFygF4 U28T635ZU1Rfw== Date: Fri, 24 Jan 2025 11:10:17 +0530 From: Manivannan Sadhasivam To: Krishna Chaitanya Chundru Cc: cros-qcom-dts-watchers@chromium.org, Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Manivannan Sadhasivam , Bjorn Helgaas , Jingoo Han , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, quic_vbadigan@quicinc.com, quic_vpernami@quicinc.com, quic_mrana@quicinc.com, mmareddy@quicinc.com, Krishna chaitanya chundru Subject: Re: [PATCH v3 1/4] arm64: dts: qcom: sc7280: Increase config size to 256MB for ECAM feature Message-ID: <20250124054017.rmrxqa5kyocuf2fi@thinkpad> References: <20250121-enable_ecam-v3-0-cd84d3b2a7ba@oss.qualcomm.com> <20250121-enable_ecam-v3-1-cd84d3b2a7ba@oss.qualcomm.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20250121-enable_ecam-v3-1-cd84d3b2a7ba@oss.qualcomm.com> On Tue, Jan 21, 2025 at 02:32:19PM +0530, Krishna Chaitanya Chundru wrote: > PCIe ECAM(Enhanced Configuration Access Mechanism) feature requires > maximum of 256MB configuration space. > > To enable this feature increase configuration space size to 256MB. If > the config space is increased, the BAR space needs to be truncated as > it resides in the same location. To avoid the bar space truncation move > config space, DBI, ELBI, iATU to upper PCIe region and use lower PCIe > region entirely for BAR region. > You also need to mention that this change depends on the commit: '10ba0854c5e6 ("PCI: qcom: Disable mirroring of DBI and iATU register space in BAR region")' > Signed-off-by: Krishna Chaitanya Chundru Reviewed-by: Manivannan Sadhasivam - Mani -- மணிவண்ணன் சதாசிவம்