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[82.149.1.172]) by smtp.gmail.com with ESMTPSA id r9-20020a1709061ba900b0073dd99a0febsm7115788ejg.188.2022.09.06.12.52.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Sep 2022 12:52:25 -0700 (PDT) From: Jernej =?utf-8?B?xaBrcmFiZWM=?= To: linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, qianfanguijin@163.com Cc: Maxime Ripard , Chen-Yu Tsai , linux-arm-kernel@lists.infradead.org, Evgeny Boger , qianfan Zhao Subject: Re: [PATCH 1/2] drivers: net: mdio-sun4i: Speedup mdio read and write Date: Tue, 06 Sep 2022 21:52:24 +0200 Message-ID: <4737709.GXAFRqVoOG@kista> In-Reply-To: <20220906075616.21347-1-qianfanguijin@163.com> References: <20220906075616.21347-1-qianfanguijin@163.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dne torek, 06. september 2022 ob 09:56:15 CEST je qianfanguijin@163.com napisal(a): > From: qianfan Zhao > > msleep(1) on my board takes about 30ms, and it is too long to accept. > Use read_poll_timeout to speedup. > > Signed-off-by: qianfan Zhao > --- > drivers/net/mdio/mdio-sun4i.c | 29 ++++++++++++----------------- > 1 file changed, 12 insertions(+), 17 deletions(-) > > diff --git a/drivers/net/mdio/mdio-sun4i.c b/drivers/net/mdio/mdio-sun4i.c > index f798de3276dc..168e2a375535 100644 > --- a/drivers/net/mdio/mdio-sun4i.c > +++ b/drivers/net/mdio/mdio-sun4i.c > @@ -26,8 +26,6 @@ > #define EMAC_MAC_MIND_REG (0x10) > #define EMAC_MAC_SSRR_REG (0x14) > > -#define MDIO_TIMEOUT (msecs_to_jiffies(100)) > - > struct sun4i_mdio_data { > void __iomem *membase; > struct regulator *regulator; > @@ -36,8 +34,7 @@ struct sun4i_mdio_data { > static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum) > { > struct sun4i_mdio_data *data = bus->priv; > - unsigned long timeout_jiffies; > - int value; > + int ret, tmp, value; > > /* issue the phy address and reg */ > writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG); > @@ -45,12 +42,11 @@ static int sun4i_mdio_read(struct mii_bus *bus, int > mii_id, int regnum) writel(0x1, data->membase + EMAC_MAC_MCMD_REG); > > /* Wait read complete */ > - timeout_jiffies = jiffies + MDIO_TIMEOUT; > - while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { > - if (time_is_before_jiffies(timeout_jiffies)) > - return -ETIMEDOUT; > - msleep(1); > - } > + ret = read_poll_timeout(readl, tmp, (tmp & 1) == 0, > + 20, 10000, false, > + data->membase + EMAC_MAC_MIND_REG); You should use readl_poll_timeout() instead, as instructed by documentation. Additionally, are you sure about both delay parameters? They are both much smaller than in original code. Same comments apply to patch 2. Best regards, Jernej > + if (ret < 0) > + return ret; > > /* push down the phy io line */ > writel(0x0, data->membase + EMAC_MAC_MCMD_REG); > @@ -64,7 +60,7 @@ static int sun4i_mdio_write(struct mii_bus *bus, int > mii_id, int regnum, u16 value) > { > struct sun4i_mdio_data *data = bus->priv; > - unsigned long timeout_jiffies; > + int ret, tmp; > > /* issue the phy address and reg */ > writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG); > @@ -72,12 +68,11 @@ static int sun4i_mdio_write(struct mii_bus *bus, int > mii_id, int regnum, writel(0x1, data->membase + EMAC_MAC_MCMD_REG); > > /* Wait read complete */ > - timeout_jiffies = jiffies + MDIO_TIMEOUT; > - while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) { > - if (time_is_before_jiffies(timeout_jiffies)) > - return -ETIMEDOUT; > - msleep(1); > - } > + ret = read_poll_timeout(readl, tmp, (tmp & 1) == 0, > + 20, 10000, false, > + data->membase + EMAC_MAC_MIND_REG); > + if (ret < 0) > + return ret; > > /* push down the phy io line */ > writel(0x0, data->membase + EMAC_MAC_MCMD_REG); > -- > 2.25.1