ramips: mtk-mmc: mt76x8: check ESD_MODE before applying AGPIO_CFG

Since mt76x8an ver1 eco2, SDXC pins can be switched to the
following pinmap:
sd_d1  -> PAD_I2S_SDI
sd_d0  -> PAD_I2S_WS
sd_cmd -> PAD_I2S_CLK
sd_d3  -> PAD_I2C_SCLK
sd_d2  -> PAD_I2C_SD
sd_clk -> PAD_GPIO0
sd_wp  -> PAD_TXD1
sd_cd  -> PAD_RXD1

To use this pinmap, one would need to set ESD_MODE bit (bit 15)
to 1 in GPIO1_MODE and switch other used pads into GPIO mode.
In this mode, we don't need to switch ethernet pins to digital
pad.

Check ESD_MODE bit before applying AGPIO_CFG and use rt_sysc_m32
to set it.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

target/linux/ramips/files-4.14/drivers/mmc/host/mtk-mmc/sd.c

@@ -2205,16 +2205,12 @@ static int msdc_drv_probe(struct platform_device *pdev)
 	struct msdc_host *host;
 	struct msdc_hw *hw;
 	int ret;
-	u32 reg;
 
 	//FIXME: this should be done by pinconf and not by the sd driver
-	if (ralink_soc == MT762X_SOC_MT7688 ||
-	    ralink_soc == MT762X_SOC_MT7628AN) {
-		/* set EPHY pads to digital mode */
-		reg = sdr_read32((void __iomem *)(RALINK_SYSCTL_BASE + 0x3c));
-		reg |= 0x1e << 16;
-		sdr_write32((void __iomem *)(RALINK_SYSCTL_BASE + 0x3c), reg);
-	}
+	if ((ralink_soc == MT762X_SOC_MT7688 ||
+	     ralink_soc == MT762X_SOC_MT7628AN) &&
+	    (!(rt_sysc_r32(0x60) & BIT(15))))
+		rt_sysc_m32(0xf << 17, 0xf << 17, 0x3c);
 
 	hw = &msdc0_hw;