netdev - [PATCH 6/6] stmmac: dwmac-mediatek: modify csr_clk value to fix mdio read/write fail

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Message-ID: <1556433009-25759-7-git-send-email-biao.huang@mediatek.com>
Date:   Sun, 28 Apr 2019 14:30:09 +0800
From:   Biao Huang <biao.huang@...iatek.com>
To:     Jose Abreu <joabreu@...opsys.com>, <davem@...emloft.net>
CC:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <netdev@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <yt.shen@...iatek.com>,
        <biao.huang@...iatek.com>, <jianguo.zhang@...iatek.com>
Subject: [PATCH 6/6] stmmac: dwmac-mediatek: modify csr_clk value to fix mdio read/write fail

The frequency of  csr clock is 66.5MHz, so the csr_clk value should
be 0. Modify the csr_clk value to fix mdio read/write fail issue.

Signed-off-by: Biao Huang <biao.huang@...iatek.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-mediatek.c   |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
index bf25629..6b12d0f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
@@ -346,8 +346,8 @@ static int mediatek_dwmac_probe(struct platform_device *pdev)
 		return PTR_ERR(plat_dat);
 
 	plat_dat->interface = priv_plat->phy_mode;
-	/* clk_csr_i = 250-300MHz & MDC = clk_csr_i/124 */
-	plat_dat->clk_csr = 5;
+	/* clk_csr_i = 60-100MHz & MDC = clk_csr_i/42 */
+	plat_dat->clk_csr = 0;
 	plat_dat->has_gmac4 = 1;
 	plat_dat->has_gmac = 0;
 	plat_dat->pmt = 0;
-- 
1.7.9.5