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 7612E1366; Fri, 17 Nov 2023 08:19:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="UetkYfFK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4C04CC433C7; Fri, 17 Nov 2023 08:19:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700209176; bh=LZPaoRPnMp8Tt22/B5tXr7XCFJ+WPuQMVSvw/SfR9PI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=UetkYfFK7TQ0GoGwY90x8MQJFTt4bSxho5GnC964NjITnhKlIgwweG/MJs8+CS2Eg 9dR5HYbPaO1JKTwE7duexHZ6lYAafXl0ydo2fLHNX6YHlDmEouBjJTETr9f+kA6URu JirpwXTNZ1kj/ytM73g1TuEFKTCTGMVlwpfoh6Z7iubwUfakcPyXITqmvyVqGb7r7P qv0IZeNlB0mh+unm7RHlh7etB7EH/a+3gd3OcCmM7b8NYnNk6/XSmaiaoV6EhM9nJ4 +BJ9stxey/LzTA04siLLByuOI5+YGQOODLBwLcCkTq8m6ntSNvzF/vhPLqCGOSN43b GIlo3JYm/GN+g== Date: Fri, 17 Nov 2023 13:49:24 +0530 From: Manivannan Sadhasivam To: Mrinmay Sarkar Cc: agross@kernel.org, andersson@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, konrad.dybcio@linaro.org, robh+dt@kernel.org, quic_shazhuss@quicinc.com, quic_nitegupt@quicinc.com, quic_ramkri@quicinc.com, quic_nayiluri@quicinc.com, dmitry.baryshkov@linaro.org, robh@kernel.org, quic_krichai@quicinc.com, quic_vbadigan@quicinc.com, quic_parass@quicinc.com, quic_schintav@quicinc.com, quic_shijjose@quicinc.com, Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Bjorn Helgaas , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org Subject: Re: [PATCH v3 1/3] PCI: qcom: Enable cache coherency for SA8775P RC Message-ID: <20231117081924.GG10361@thinkpad> References: <1700051821-1087-1-git-send-email-quic_msarkar@quicinc.com> <1700051821-1087-2-git-send-email-quic_msarkar@quicinc.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: <1700051821-1087-2-git-send-email-quic_msarkar@quicinc.com> On Wed, Nov 15, 2023 at 06:06:59PM +0530, Mrinmay Sarkar wrote: > This change will enable cache snooping logic to support > cache coherency for 8775 RC platform. > Please add information on why the cache snoop logic is enabled only on this platform. You have added info in the cover letter, but that's not going to be part of the git history. - Mani > Signed-off-by: Mrinmay Sarkar > --- > drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c > index 6902e97..b82ccd1 100644 > --- a/drivers/pci/controller/dwc/pcie-qcom.c > +++ b/drivers/pci/controller/dwc/pcie-qcom.c > @@ -51,6 +51,7 @@ > #define PARF_SID_OFFSET 0x234 > #define PARF_BDF_TRANSLATE_CFG 0x24c > #define PARF_SLV_ADDR_SPACE_SIZE 0x358 > +#define PCIE_PARF_NO_SNOOP_OVERIDE 0x3d4 > #define PARF_DEVICE_TYPE 0x1000 > #define PARF_BDF_TO_SID_TABLE_N 0x2000 > > @@ -117,6 +118,10 @@ > /* PARF_LTSSM register fields */ > #define LTSSM_EN BIT(8) > > +/* PARF_NO_SNOOP_OVERIDE register fields */ > +#define WR_NO_SNOOP_OVERIDE_EN BIT(1) > +#define RD_NO_SNOOP_OVERIDE_EN BIT(3) > + > /* PARF_DEVICE_TYPE register fields */ > #define DEVICE_TYPE_RC 0x4 > > @@ -961,6 +966,14 @@ static int qcom_pcie_init_2_7_0(struct qcom_pcie *pcie) > > static int qcom_pcie_post_init_2_7_0(struct qcom_pcie *pcie) > { > + struct dw_pcie *pci = pcie->pci; > + struct device *dev = pci->dev; > + > + /* Enable cache snooping for SA8775P */ > + if (of_device_is_compatible(dev->of_node, "qcom,pcie-sa8775p")) > + writel(WR_NO_SNOOP_OVERIDE_EN | RD_NO_SNOOP_OVERIDE_EN, > + pcie->parf + PCIE_PARF_NO_SNOOP_OVERIDE); > + > qcom_pcie_clear_hpc(pcie->pci); > > return 0; > -- > 2.7.4 > -- மணிவண்ணன் சதாசிவம்