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[93.34.89.13]) by smtp.googlemail.com with ESMTPSA id 8-20020a05600c230800b004042dbb8925sm4521218wmo.38.2023.09.27.05.29.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Sep 2023 05:29:34 -0700 (PDT) From: Christian Marangi To: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alexandre Torgue , Jose Abreu , Maxime Coquelin , Simon Horman , Andrew Halaney , Bartosz Golaszewski , "Russell King (Oracle)" , Shenwei Wang , Jochen Henneberg , Giuseppe Cavallaro , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Cc: Christian Marangi Subject: [net-next PATCH 2/2] net: stmmac: add support for DMA Arbitration Scheme Date: Wed, 27 Sep 2023 14:29:28 +0200 Message-Id: <20230927122928.22033-2-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230927122928.22033-1-ansuelsmth@gmail.com> References: <20230927122928.22033-1-ansuelsmth@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (howler.vger.email [0.0.0.0]); Wed, 27 Sep 2023 05:29:47 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1778223483551605514 X-GMAIL-MSGID: 1778223483551605514 Add support for DMA Arbitration Scheme tune up to program the DMA to put priority on Rx instead of applying Round-Robin logic. This special DMA bus mode was defined in the header from a long time but was never actually implemented. This option is used on the original setup on the ipq806x-gmac driver based on DWMAC1000. Signed-off-by: Christian Marangi --- drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c | 3 +++ drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 1 + include/linux/stmmac.h | 1 + 3 files changed, 5 insertions(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c index daf79cdbd3ec..14eb7e8d61ea 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c @@ -104,6 +104,9 @@ static void dwmac1000_dma_init(void __iomem *ioaddr, if (dma_cfg->aal) value |= DMA_BUS_MODE_AAL; + if (dma_cfg->arbit) + value |= DMA_BUS_MODE_DA; + writel(value, ioaddr + DMA_BUS_MODE); /* Mask interrupts by writing to CSR7 */ diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c index 843bd8804bfa..f5791b03b320 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c @@ -576,6 +576,7 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac) dma_cfg->pblx8 = !of_property_read_bool(np, "snps,no-pbl-x8"); dma_cfg->aal = of_property_read_bool(np, "snps,aal"); + dma_cfg->arbit = of_property_read_bool(np, "snps,arbit"); dma_cfg->fixed_burst = of_property_read_bool(np, "snps,fixed-burst"); dma_cfg->mixed_burst = of_property_read_bool(np, "snps,mixed-burst"); diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h index c0079a7574ae..04a61f1eba90 100644 --- a/include/linux/stmmac.h +++ b/include/linux/stmmac.h @@ -97,6 +97,7 @@ struct stmmac_dma_cfg { int fixed_burst; int mixed_burst; bool aal; + bool arbit; bool eame; bool multi_msi_en; bool dche;