From: Richard Zhu <r65037@freescale.com>
Date: Wed, 14 Dec 2011 05:10:34 +0000 (+0800)
Subject: ENGR00170244-4 ARM: AHCI: Enable PDDQ mode on mx6 sabrelite board
X-Git-Tag: v3.0.35-fsl_4.1.0~1923
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2637b1f7a49bd434d638479ef2f1072325ccf94c;p=karo-tx-linux.git

ENGR00170244-4 ARM: AHCI: Enable PDDQ mode on mx6 sabrelite board

In order to save the power consumption, enable the
PDDQ mode of AHCI PHY when there is no sata disk
on the port

Signed-off-by: Richard Zhu <r65037@freescale.com>
---

diff --git a/arch/arm/mach-mx6/board-mx6q_sabrelite.c b/arch/arm/mach-mx6/board-mx6q_sabrelite.c
index d937d2237839..8295e73b3273 100644
--- a/arch/arm/mach-mx6/board-mx6q_sabrelite.c
+++ b/arch/arm/mach-mx6/board-mx6q_sabrelite.c
@@ -589,7 +589,7 @@ static void __init imx6q_sabrelite_init_usb(void)
 static int mx6q_sabrelite_sata_init(struct device *dev, void __iomem *addr)
 {
 	u32 tmpdata;
-	int ret = 0, iterations = 20;
+	int ret = 0;
 	struct clk *clk;
 
 	sata_clk = clk_get(dev, "imx_sata_clk");
@@ -634,23 +634,9 @@ static int mx6q_sabrelite_sata_init(struct device *dev, void __iomem *addr)
 	tmpdata = clk_get_rate(clk) / 1000;
 	clk_put(clk);
 
-	sata_init(addr, tmpdata);
-
-	/* Release resources when there is no device on the port */
-	do {
-		if ((readl(addr + PORT_SATA_SR) & 0xF) == 0)
-			msleep(25);
-		else
-			break;
-
-		if (iterations == 0) {
-			dev_info(dev, "NO sata disk.\n");
-			ret = -ENODEV;
-			goto release_sata_clk;
-		}
-	} while (iterations-- > 0);
-
-	return ret;
+	ret = sata_init(addr, tmpdata);
+	if (ret == 0)
+		return ret;
 
 release_sata_clk:
 	clk_disable(sata_clk);