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Message-ID: <20241118104735.3741749-4-jacky_chou@aspeedtech.com> Date: Mon, 18 Nov 2024 18:47:35 +0800 From: Jacky Chou <jacky_chou@...eedtech.com> To: <andrew+netdev@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>, <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <joel@....id.au>, <andrew@...econstruct.com.au>, <hkallweit1@...il.com>, <linux@...linux.org.uk>, <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <linux-aspeed@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org> CC: <jacky_chou@...eedtech.com> Subject: [net-next 3/3] net: mdio: aspeed: Add dummy read for fire control Add a dummy read to ensure triggering mdio controller before starting polling the status of mdio controller. Signed-off-by: Jacky Chou <jacky_chou@...eedtech.com> --- drivers/net/mdio/mdio-aspeed.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/mdio/mdio-aspeed.c b/drivers/net/mdio/mdio-aspeed.c index 4d5a115baf85..feae30bc3e78 100644 --- a/drivers/net/mdio/mdio-aspeed.c +++ b/drivers/net/mdio/mdio-aspeed.c @@ -62,6 +62,8 @@ static int aspeed_mdio_op(struct mii_bus *bus, u8 st, u8 op, u8 phyad, u8 regad, | FIELD_PREP(ASPEED_MDIO_DATA_MIIRDATA, data); iowrite32(ctrl, ctx->base + ASPEED_MDIO_CTRL); + /* Add dummy read to ensure triggering mdio controller */ + (void)ioread32(ctx->base + ASPEED_MDIO_CTRL); return readl_poll_timeout(ctx->base + ASPEED_MDIO_CTRL, ctrl, !(ctrl & ASPEED_MDIO_CTRL_FIRE), -- 2.25.1
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