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[83.9.1.63]) by smtp.gmail.com with ESMTPSA id y14-20020a2e95ce000000b002b4771cdc67sm1682352ljh.35.2023.06.23.03.17.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 23 Jun 2023 03:17:24 -0700 (PDT) Message-ID: Date: Fri, 23 Jun 2023 12:17:22 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH] PCI: qcom: configure the parf halt window size to 1GB To: Devi Priya , agross@kernel.org, andersson@kernel.org, lpieralisi@kernel.org, kw@linux.com, robh@kernel.org, bhelgaas@google.com, mani@kernel.org, linux-arm-msm@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Cc: quic_srichara@quicinc.com, quic_sjaganat@quicinc.com, quic_kathirav@quicinc.com, quic_anusha@quicinc.com, quic_ipkumar@quicinc.com References: <20230623045731.29397-1-quic_devipriy@quicinc.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20230623045731.29397-1-quic_devipriy@quicinc.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On 23.06.2023 06:57, Devi Priya wrote: > Configure the ADDR_BIT_INDEX of PARF_AXI_MSTR_WR_ADDR_HALT_V2 register with > 0x1E to increase the halt window size to 1GB so that, when new inbound > posted write transactions whose address crosses 1G address range, the > controller would halt all the incoming writes until all the previous AXI > responses are received. > > Signed-off-by: Devi Priya > --- Has this been tested on anything except IPQ9574? Does it concern other SoCs? > This patch depends on the below series which adds support for PCIe > controllers in IPQ9574 > https://lore.kernel.org/linux-arm-msm/20230519090219.15925-1-quic_devipriy@quicinc.com/ > > drivers/pci/controller/dwc/pcie-qcom.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c > index c7579dfa5b1c..26c40e006120 100644 > --- a/drivers/pci/controller/dwc/pcie-qcom.c > +++ b/drivers/pci/controller/dwc/pcie-qcom.c > @@ -116,6 +116,8 @@ > > /* PARF_AXI_MSTR_WR_ADDR_HALT register fields */ > #define EN BIT(31) > +#define ADDR_BIT_INDEX (BIT(0) | BIT(1) | BIT(2) | \ > + BIT(3) | BIT(4) | BIT(5)) You surely should have the names of these bitfields, mind defining them? > > /* PARF_LTSSM register fields */ > #define LTSSM_EN BIT(8) > @@ -154,6 +156,8 @@ > > #define QCOM_PCIE_CRC8_POLYNOMIAL (BIT(2) | BIT(1) | BIT(0)) > > +#define PARF_AXI_MSTR_WR_ADDR_HALT_WINDOW_SIZE 0x1e > + > #define QCOM_PCIE_1_0_0_MAX_CLOCKS 4 > struct qcom_pcie_resources_1_0_0 { > struct clk_bulk_data clks[QCOM_PCIE_1_0_0_MAX_CLOCKS]; > @@ -1126,6 +1130,11 @@ static int qcom_pcie_post_init(struct qcom_pcie *pcie) > > writel(0, pcie->parf + PARF_Q2A_FLUSH); > > + val = readl(pcie->parf + PARF_AXI_MSTR_WR_ADDR_HALT_V2); > + val &= ~ADDR_BIT_INDEX; > + writel(val | PARF_AXI_MSTR_WR_ADDR_HALT_WINDOW_SIZE, pcie->parf + > + PARF_AXI_MSTR_WR_ADDR_HALT_V2); val |= .. writel(val, pcie..) would be more readable Konrad > + > dw_pcie_dbi_ro_wr_en(pci); > writel(PCIE_CAP_SLOT_VAL, pci->dbi_base + offset + PCI_EXP_SLTCAP); >